自定义仿网易云音乐播放界面

清单文件添加

 <service
            android:name="com.rookie.shiyue20180528.model.MusicService"
            android:enabled="true"
            android:exported="false"
            />

style.xml

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@android:color/holo_red_light</item>
        <item name="windowNoTitle">true</item>
        <item name="android:windowTranslucentStatus" tools:ignore="NewApi">true</item>
    </style>

    <style name="netease_toolbar_title" parent="@style/TextAppearance.Widget.AppCompat.Toolbar.Title">
        <item name="android:textColor">@android:color/white</item>
        <item name="android:textSize">17sp</item>
    </style>

    <style name="netease_toolbar_subtitle" parent="@style/TextAppearance.Widget.AppCompat.Toolbar.Subtitle">
        <item name="android:textColor">#eeeeee</item>
        <item name="android:textSize">14sp</item>
    </style>

    <style name="neteasa_music_time_text_sytle">
        <item name="android:layout_width">wrap_content</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:textColor">#ccc</item>
        <item name="android:textSize">9sp</item>
    </style>

    <style name="neteasa_music_time_seek_bar_sytle"
        parent="Widget.AppCompat.SeekBar">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:thumb">@drawable/ic_seekbar_thumb</item>
    </style>

MainActivity

public class MainActivity extends AppCompatActivity implements DiscView.IPlayInfo, View.OnClickListener {

    private DiscView mDisc;
    private Toolbar mToolbar;
    private SeekBar mSeekBar;
    private ImageView mIvPlayOrPause, mIvNext, mIvLast;
    private TextView mTvMusicDuration,mTvTotalMusicDuration;
    private BackgourndAnimationRelativeLayout mRootLayout;
    public static final int MUSIC_MESSAGE = 0;

    public static final String PARAM_MUSIC_LIST = "PARAM_MUSIC_LIST";

    private Handler mMusicHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            mSeekBar.setProgress(mSeekBar.getProgress() + 1000);
            mTvMusicDuration.setText(duration2Time(mSeekBar.getProgress()));
            startUpdateSeekBarProgress();
        }
    };

    private MusicReceiver mMusicReceiver = new MusicReceiver();
    private List<MusicData> mMusicDatas = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initMusicDatas();
        initView();
        initMusicReceiver();
        makeStatusBarTransparent();
    }

    private void initMusicReceiver() {
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(MusicService.ACTION_STATUS_MUSIC_PLAY);
        intentFilter.addAction(MusicService.ACTION_STATUS_MUSIC_PAUSE);
        intentFilter.addAction(MusicService.ACTION_STATUS_MUSIC_DURATION);
        intentFilter.addAction(MusicService.ACTION_STATUS_MUSIC_COMPLETE);
        /*注册本地广播*/
        LocalBroadcastManager.getInstance(this).registerReceiver(mMusicReceiver,intentFilter);
    }

    private void initView() {
        mDisc = (DiscView) findViewById(R.id.discview);
        mIvNext = (ImageView) findViewById(R.id.ivNext);
        mIvLast = (ImageView) findViewById(R.id.ivLast);
        mIvPlayOrPause = (ImageView) findViewById(R.id.ivPlayOrPause);
        mTvMusicDuration = (TextView) findViewById(R.id.tvCurrentTime);
        mTvTotalMusicDuration = (TextView) findViewById(R.id.tvTotalTime);
        mSeekBar = (SeekBar) findViewById(R.id.musicSeekBar);
        mRootLayout = (BackgourndAnimationRelativeLayout) findViewById(R.id.rootLayout);

        mToolbar = (Toolbar) findViewById(R.id.toolBar);
        setSupportActionBar(mToolbar);

        mDisc.setPlayInfoListener(this);
        mIvLast.setOnClickListener(this);
        mIvNext.setOnClickListener(this);
        mIvPlayOrPause.setOnClickListener(this);

        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                mTvMusicDuration.setText(duration2Time(progress));
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                stopUpdateSeekBarProgree();
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                seekTo(seekBar.getProgress());
                startUpdateSeekBarProgress();
            }
        });

        mTvMusicDuration.setText(duration2Time(0));
        mTvTotalMusicDuration.setText(duration2Time(0));
        mDisc.setMusicDataList(mMusicDatas);
    }

    private void stopUpdateSeekBarProgree() {
        mMusicHandler.removeMessages(MUSIC_MESSAGE);
    }

    /*设置透明状态栏*/
    private void makeStatusBarTransparent() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }

    private void initMusicDatas() {
        MusicData musicData1 = new MusicData(R.raw.music1, R.raw.ic_music1, "寻", "三亩地");
        MusicData musicData2 = new MusicData(R.raw.music2, R.raw.ic_music2, "Nightingale", "YANI");
        MusicData musicData3 = new MusicData(R.raw.music3, R.raw.ic_music3, "Cornfield Chase", "Hans Zimmer");

        mMusicDatas.add(musicData1);
        mMusicDatas.add(musicData2);
        mMusicDatas.add(musicData3);

        Intent intent = new Intent(this, MusicService.class);
        intent.putExtra(PARAM_MUSIC_LIST, (Serializable) mMusicDatas);
        startService(intent);
    }

    private void try2UpdateMusicPicBackground(final int musicPicRes) {
        if (mRootLayout.isNeed2UpdateBackground(musicPicRes)) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    final Drawable foregroundDrawable = getForegroundDrawable(musicPicRes);
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mRootLayout.setForeground(foregroundDrawable);
                            mRootLayout.beginAnimation();
                        }
                    });
                }
            }).start();
        }
    }

    private Drawable getForegroundDrawable(int musicPicRes) {
        /*得到屏幕的宽高比，以便按比例切割图片一部分*/
        final float widthHeightSize = (float) (DisplayUtil.getScreenWidth(MainActivity.this)
                * 1.0 / DisplayUtil.getScreenHeight(this) * 1.0);

        Bitmap bitmap = getForegroundBitmap(musicPicRes);
        int cropBitmapWidth = (int) (widthHeightSize * bitmap.getHeight());
        int cropBitmapWidthX = (int) ((bitmap.getWidth() - cropBitmapWidth) / 2.0);

        /*切割部分图片*/
        Bitmap cropBitmap = Bitmap.createBitmap(bitmap, cropBitmapWidthX, 0, cropBitmapWidth,
                bitmap.getHeight());
        /*缩小图片*/
        Bitmap scaleBitmap = Bitmap.createScaledBitmap(cropBitmap, bitmap.getWidth() / 50, bitmap
                .getHeight() / 50, false);
        /*模糊化*/
        final Bitmap blurBitmap = FastBlurUtil.doBlur(scaleBitmap, 8, true);

        final Drawable foregroundDrawable = new BitmapDrawable(blurBitmap);
        /*加入灰色遮罩层，避免图片过亮影响其他控件*/
        foregroundDrawable.setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);
        return foregroundDrawable;
    }

    private Bitmap getForegroundBitmap(int musicPicRes) {
        int screenWidth = DisplayUtil.getScreenWidth(this);
        int screenHeight = DisplayUtil.getScreenHeight(this);

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;

        BitmapFactory.decodeResource(getResources(), musicPicRes, options);
        int imageWidth = options.outWidth;
        int imageHeight = options.outHeight;

        if (imageWidth < screenWidth && imageHeight < screenHeight) {
            return BitmapFactory.decodeResource(getResources(), musicPicRes);
        }

        int sample = 2;
        int sampleX = imageWidth / DisplayUtil.getScreenWidth(this);
        int sampleY = imageHeight / DisplayUtil.getScreenHeight(this);

        if (sampleX > sampleY && sampleY > 1) {
            sample = sampleX;
        } else if (sampleY > sampleX && sampleX > 1) {
            sample = sampleY;
        }

        options.inJustDecodeBounds = false;
        options.inSampleSize = sample;
        options.inPreferredConfig = Bitmap.Config.RGB_565;

        return BitmapFactory.decodeResource(getResources(), musicPicRes, options);
    }

    @Override
    public void onMusicInfoChanged(String musicName, String musicAuthor) {
        getSupportActionBar().setTitle(musicName);
        getSupportActionBar().setSubtitle(musicAuthor);
    }

    @Override
    public void onMusicPicChanged(int musicPicRes) {
        try2UpdateMusicPicBackground(musicPicRes);
    }

    @Override
    public void onMusicChanged(DiscView.MusicChangedStatus musicChangedStatus) {
        switch (musicChangedStatus) {
            case PLAY:{
                play();
                break;
            }
            case PAUSE:{
                pause();
                break;
            }
            case NEXT:{
                next();
                break;
            }
            case LAST:{
                last();
                break;
            }
            case STOP:{
                stop();
                break;
            }
        }
    }

    @Override
    public void onClick(View v) {
        if (v == mIvPlayOrPause) {
            mDisc.playOrPause();
        } else if (v == mIvNext) {
            mDisc.next();
        } else if (v == mIvLast) {
            mDisc.last();
        }
    }

    private void play() {
        optMusic(MusicService.ACTION_OPT_MUSIC_PLAY);
        startUpdateSeekBarProgress();
    }

    private void pause() {
        optMusic(MusicService.ACTION_OPT_MUSIC_PAUSE);
        stopUpdateSeekBarProgree();
    }

    private void stop() {
        stopUpdateSeekBarProgree();
        mIvPlayOrPause.setImageResource(R.drawable.ic_play);
        mTvMusicDuration.setText(duration2Time(0));
        mTvTotalMusicDuration.setText(duration2Time(0));
        mSeekBar.setProgress(0);
    }

    private void next() {
        mRootLayout.postDelayed(new Runnable() {
            @Override
            public void run() {
                optMusic(MusicService.ACTION_OPT_MUSIC_NEXT);
            }
        },1000);
        stopUpdateSeekBarProgree();
        mTvMusicDuration.setText(duration2Time(0));
        mTvTotalMusicDuration.setText(duration2Time(0));
    }

    private void last() {
        mRootLayout.postDelayed(new Runnable() {
            @Override
            public void run() {
                optMusic(MusicService.ACTION_OPT_MUSIC_LAST);
            }
        }, 1000);
        stopUpdateSeekBarProgree();
        mTvMusicDuration.setText(duration2Time(0));
        mTvTotalMusicDuration.setText(duration2Time(0));
    }

    private void complete(boolean isOver) {
        if (isOver) {
            mDisc.stop();
        } else {
            mDisc.next();
        }
    }

    private void optMusic(final String action) {
        LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(action));
    }

    private void seekTo(int position) {
        Intent intent = new Intent(MusicService.ACTION_OPT_MUSIC_SEEK_TO);
        intent.putExtra(MusicService.PARAM_MUSIC_SEEK_TO,position);
        LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    }

    private void startUpdateSeekBarProgress() {
        /*避免重复发送Message*/
        stopUpdateSeekBarProgree();
        mMusicHandler.sendEmptyMessageDelayed(0,1000);
    }

    /*根据时长格式化称时间文本*/
    private String duration2Time(int duration) {
        int min = duration / 1000 / 60;
        int sec = duration / 1000 % 60;

        return (min < 10 ? "0" + min : min + "") + ":" + (sec < 10 ? "0" + sec : sec + "");
    }

    private void updateMusicDurationInfo(int totalDuration) {
        mSeekBar.setProgress(0);
        mSeekBar.setMax(totalDuration);
        mTvTotalMusicDuration.setText(duration2Time(totalDuration));
        mTvMusicDuration.setText(duration2Time(0));
        startUpdateSeekBarProgress();
    }

    class MusicReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(MusicService.ACTION_STATUS_MUSIC_PLAY)) {
                mIvPlayOrPause.setImageResource(R.drawable.ic_pause);
                int currentPosition = intent.getIntExtra(MusicService.PARAM_MUSIC_CURRENT_POSITION, 0);
                mSeekBar.setProgress(currentPosition);
                if(!mDisc.isPlaying()){
                    mDisc.playOrPause();
                }
            } else if (action.equals(MusicService.ACTION_STATUS_MUSIC_PAUSE)) {
                mIvPlayOrPause.setImageResource(R.drawable.ic_play);
                if (mDisc.isPlaying()) {
                    mDisc.playOrPause();
                }
            } else if (action.equals(MusicService.ACTION_STATUS_MUSIC_DURATION)) {
                int duration = intent.getIntExtra(MusicService.PARAM_MUSIC_DURATION, 0);
                updateMusicDurationInfo(duration);
            } else if (action.equals(MusicService.ACTION_STATUS_MUSIC_COMPLETE)) {
                boolean isOver = intent.getBooleanExtra(MusicService.PARAM_MUSIC_IS_OVER, true);
                complete(isOver);
            }
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        LocalBroadcastManager.getInstance(this).unregisterReceiver(mMusicReceiver);
    }
}

FastBlurUtil

public class FastBlurUtil {

    public static Bitmap doBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) {


        Bitmap bitmap;
        if (canReuseInBitmap) {
            bitmap = sentBitmap;
        } else {
            bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
        }

        if (radius < 1) {
            return (null);
        }

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        int[] pix = new int[w * h];
        bitmap.getPixels(pix, 0, w, 0, 0, w, h);

        int wm = w - 1;
        int hm = h - 1;
        int wh = w * h;
        int div = radius + radius + 1;

        int r[] = new int[wh];
        int g[] = new int[wh];
        int b[] = new int[wh];
        int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
        int vmin[] = new int[Math.max(w, h)];

        int divsum = (div + 1) >> 1;
        divsum *= divsum;
        int dv[] = new int[256 * divsum];
        for (i = 0; i < 256 * divsum; i++) {
            dv[i] = (i / divsum);
        }

        yw = yi = 0;

        int[][] stack = new int[div][3];
        int stackpointer;
        int stackstart;
        int[] sir;
        int rbs;
        int r1 = radius + 1;
        int routsum, goutsum, boutsum;
        int rinsum, ginsum, binsum;

        for (y = 0; y < h; y++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            for (i = -radius; i <= radius; i++) {
                p = pix[yi + Math.min(wm, Math.max(i, 0))];
                sir = stack[i + radius];
                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                rbs = r1 - Math.abs(i);
                rsum += sir[0] * rbs;
                gsum += sir[1] * rbs;
                bsum += sir[2] * rbs;
                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }
            }
            stackpointer = radius;

            for (x = 0; x < w; x++) {

                r[yi] = dv[rsum];
                g[yi] = dv[gsum];
                b[yi] = dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (y == 0) {
                    vmin[x] = Math.min(x + radius + 1, wm);
                }
                p = pix[yw + vmin[x]];

                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[(stackpointer) % div];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi++;
            }
            yw += w;
        }
        for (x = 0; x < w; x++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            yp = -radius * w;
            for (i = -radius; i <= radius; i++) {
                yi = Math.max(0, yp) + x;

                sir = stack[i + radius];

                sir[0] = r[yi];
                sir[1] = g[yi];
                sir[2] = b[yi];

                rbs = r1 - Math.abs(i);

                rsum += r[yi] * rbs;
                gsum += g[yi] * rbs;
                bsum += b[yi] * rbs;

                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }

                if (i < hm) {
                    yp += w;
                }
            }
            yi = x;
            stackpointer = radius;
            for (y = 0; y < h; y++) {
                // Preserve alpha channel: ( 0xff000000 & pix[yi] )
                pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (x == 0) {
                    vmin[y] = Math.min(y + r1, hm) * w;
                }
                p = x + vmin[y];

                sir[0] = r[p];
                sir[1] = g[p];
                sir[2] = b[p];

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[stackpointer];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi += w;
            }
        }

        bitmap.setPixels(pix, 0, w, 0, 0, w, h);

        return (bitmap);
    }

}

DisplayUtil

public class DisplayUtil {

    /*手柄起始角度*/
    public static final float ROTATION_INIT_NEEDLE = -30;

    /*截图屏幕宽高*/
    private static final float BASE_SCREEN_WIDTH = (float) 1080.0;
    private static final float BASE_SCREEN_HEIGHT = (float) 1920.0;

    /*唱针宽高、距离等比例*/
    public static final float SCALE_NEEDLE_WIDTH = (float) (276.0 / BASE_SCREEN_WIDTH);
    public static final float SCALE_NEEDLE_MARGIN_LEFT = (float) (500.0 / BASE_SCREEN_WIDTH);
    public static final float SCALE_NEEDLE_PIVOT_X = (float) (43.0 / BASE_SCREEN_WIDTH);
    public static final float SCALE_NEEDLE_PIVOT_Y = (float) (43.0 / BASE_SCREEN_WIDTH);
    public static final float SCALE_NEEDLE_HEIGHT = (float) (413.0 / BASE_SCREEN_HEIGHT);
    public static final float SCALE_NEEDLE_MARGIN_TOP = (float) (43.0 / BASE_SCREEN_HEIGHT);

    /*唱盘比例*/
    public static final float SCALE_DISC_SIZE = (float) (813.0 / BASE_SCREEN_WIDTH);
    public static final float SCALE_DISC_MARGIN_TOP = (float) (190 / BASE_SCREEN_HEIGHT);

    /*专辑图片比例*/
    public static final float SCALE_MUSIC_PIC_SIZE = (float) (533.0 / BASE_SCREEN_WIDTH);

    /*设备屏幕宽度*/
    public static int getScreenWidth(Context context) {
        return context.getResources().getDisplayMetrics().widthPixels;
    }

    /*设备屏幕高度*/
    public static int getScreenHeight(Context context) {
        return context.getResources().getDisplayMetrics().heightPixels;
    }
}

MusicService

public class MusicService extends Service implements MediaPlayer.OnCompletionListener {

    /*操作指令*/
    public static final String ACTION_OPT_MUSIC_PLAY = "ACTION_OPT_MUSIC_PLAY";
    public static final String ACTION_OPT_MUSIC_PAUSE = "ACTION_OPT_MUSIC_PAUSE";
    public static final String ACTION_OPT_MUSIC_NEXT = "ACTION_OPT_MUSIC_NEXT";
    public static final String ACTION_OPT_MUSIC_LAST = "ACTION_OPT_MUSIC_LAST";
    public static final String ACTION_OPT_MUSIC_SEEK_TO = "ACTION_OPT_MUSIC_SEEK_TO";

    /*状态指令*/
    public static final String ACTION_STATUS_MUSIC_PLAY = "ACTION_STATUS_MUSIC_PLAY";
    public static final String ACTION_STATUS_MUSIC_PAUSE = "ACTION_STATUS_MUSIC_PAUSE";
    public static final String ACTION_STATUS_MUSIC_COMPLETE = "ACTION_STATUS_MUSIC_COMPLETE";
    public static final String ACTION_STATUS_MUSIC_DURATION = "ACTION_STATUS_MUSIC_DURATION";

    public static final String PARAM_MUSIC_DURATION = "PARAM_MUSIC_DURATION";
    public static final String PARAM_MUSIC_SEEK_TO = "PARAM_MUSIC_SEEK_TO";
    public static final String PARAM_MUSIC_CURRENT_POSITION = "PARAM_MUSIC_CURRENT_POSITION";
    public static final String PARAM_MUSIC_IS_OVER = "PARAM_MUSIC_IS_OVER";

    private int mCurrentMusicIndex = 0;
    private boolean mIsMusicPause = false;
    private List<MusicData> mMusicDatas = new ArrayList<>();

    private MusicReceiver mMusicReceiver = new MusicReceiver();
    private MediaPlayer mMediaPlayer = new MediaPlayer();

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        initMusicDatas(intent);
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        initBoardCastReceiver();
    }

    private void initMusicDatas(Intent intent) {
        if (intent == null) return;
        List<MusicData> musicDatas = (List<MusicData>) intent.getSerializableExtra(MainActivity.PARAM_MUSIC_LIST);
        mMusicDatas.addAll(musicDatas);
    }

    private void initBoardCastReceiver() {
        IntentFilter intentFilter = new IntentFilter();

        intentFilter.addAction(ACTION_OPT_MUSIC_PLAY);
        intentFilter.addAction(ACTION_OPT_MUSIC_PAUSE);
        intentFilter.addAction(ACTION_OPT_MUSIC_NEXT);
        intentFilter.addAction(ACTION_OPT_MUSIC_LAST);
        intentFilter.addAction(ACTION_OPT_MUSIC_SEEK_TO);

        LocalBroadcastManager.getInstance(this).registerReceiver(mMusicReceiver,intentFilter);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mMediaPlayer.release();
        mMediaPlayer = null;
        LocalBroadcastManager.getInstance(this).unregisterReceiver(mMusicReceiver);
    }

    private void play(final int index) {
        if (index >= mMusicDatas.size()) return;
        if (mCurrentMusicIndex == index && mIsMusicPause) {
            mMediaPlayer.start();
        } else {
            mMediaPlayer.stop();
            mMediaPlayer = null;

            mMediaPlayer = MediaPlayer.create(getApplicationContext(), mMusicDatas.get(index)
                    .getMusicRes());
            mMediaPlayer.start();
            mMediaPlayer.setOnCompletionListener(this);
            mCurrentMusicIndex = index;
            mIsMusicPause = false;

            int duration = mMediaPlayer.getDuration();
            sendMusicDurationBroadCast(duration);
        }
        sendMusicStatusBroadCast(ACTION_STATUS_MUSIC_PLAY);
    }

    private void pause() {
        mMediaPlayer.pause();
        mIsMusicPause = true;
        sendMusicStatusBroadCast(ACTION_STATUS_MUSIC_PAUSE);
    }

    private void stop() {
        mMediaPlayer.stop();
    }

    private void next() {
        if (mCurrentMusicIndex + 1 < mMusicDatas.size()) {
            play(mCurrentMusicIndex + 1);
        } else {
            stop();
        }
    }

    private void last() {
        if (mCurrentMusicIndex != 0) {
            play(mCurrentMusicIndex - 1);
        }
    }

    private void seekTo(Intent intent) {
        if (mMediaPlayer.isPlaying()) {
            int position = intent.getIntExtra(PARAM_MUSIC_SEEK_TO, 0);
            mMediaPlayer.seekTo(position);
        }
    }

    @Override
    public void onCompletion(MediaPlayer mp) {
        sendMusicCompleteBroadCast();
    }

    class MusicReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(ACTION_OPT_MUSIC_PLAY)) {
                play(mCurrentMusicIndex);
            } else if (action.equals(ACTION_OPT_MUSIC_PAUSE)) {
                pause();
            } else if (action.equals(ACTION_OPT_MUSIC_LAST)) {
                last();
            } else if (action.equals(ACTION_OPT_MUSIC_NEXT)) {
                next();
            } else if (action.equals(ACTION_OPT_MUSIC_SEEK_TO)) {
                seekTo(intent);
            }
        }
    }

    private void sendMusicCompleteBroadCast() {
        Intent intent = new Intent(ACTION_STATUS_MUSIC_COMPLETE);
        intent.putExtra(PARAM_MUSIC_IS_OVER, (mCurrentMusicIndex == mMusicDatas.size() - 1));
        LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    }

    private void sendMusicDurationBroadCast(int duration) {
        Intent intent = new Intent(ACTION_STATUS_MUSIC_DURATION);
        intent.putExtra(PARAM_MUSIC_DURATION, duration);
        LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    }

    private void sendMusicStatusBroadCast(String action) {
        Intent intent = new Intent(action);
        if (action.equals(ACTION_STATUS_MUSIC_PLAY)) {
            intent.putExtra(PARAM_MUSIC_CURRENT_POSITION,mMediaPlayer.getCurrentPosition());
        }
        LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    }

}

MusicData

public class MusicData implements Serializable {
    /*音乐资源id*/
    private int mMusicRes;
    /*专辑图片id*/
    private int mMusicPicRes;
    /*音乐名称*/
    private String mMusicName;
    /*作者*/
    private String mMusicAuthor;

    public MusicData(int mMusicRes, int mMusicPicRes, String mMusicName, String mMusicAuthor) {
        this.mMusicRes = mMusicRes;
        this.mMusicPicRes = mMusicPicRes;
        this.mMusicName = mMusicName;
        this.mMusicAuthor = mMusicAuthor;
    }

    public int getMusicRes() {
        return mMusicRes;
    }

    public int getMusicPicRes() {
        return mMusicPicRes;
    }

    public String getMusicName() {
        return mMusicName;
    }

    public String getMusicAuthor() {
        return mMusicAuthor;
    }
}

DiscView

import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;
import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.support.v4.graphics.drawable.RoundedBitmapDrawable;
import android.support.v4.graphics.drawable.RoundedBitmapDrawableFactory;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.LinearInterpolator;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Toast;


import com.rookie.shiyue20180528.R;
import com.rookie.shiyue20180528.utils.DisplayUtil;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by 暗夜 on 2018/5/28.
 */





/**
 * Created by AchillesL on 2016/11/15.
 */

public class DiscView extends RelativeLayout {

    private ImageView mIvNeedle;
    private ViewPager mVpContain;
    private ViewPagerAdapter mViewPagerAdapter;
    private ObjectAnimator mNeedleAnimator;

    private List<View> mDiscLayouts = new ArrayList<>();

    private List<MusicData> mMusicDatas = new ArrayList<>();
    private List<ObjectAnimator> mDiscAnimators = new ArrayList<>();
    /*标记ViewPager是否处于偏移的状态*/
    private boolean mViewPagerIsOffset = false;

    /*标记唱针复位后，是否需要重新偏移到唱片处*/
    private boolean mIsNeed2StartPlayAnimator = false;
    private MusicStatus musicStatus = MusicStatus.STOP;

    public static final int DURATION_NEEDLE_ANIAMTOR = 500;
    private NeedleAnimatorStatus needleAnimatorStatus = NeedleAnimatorStatus.IN_FAR_END;

    private IPlayInfo mIPlayInfo;

    private int mScreenWidth, mScreenHeight;

    /*唱针当前所处的状态*/
    private enum NeedleAnimatorStatus {
        /*移动时：从唱盘往远处移动*/
        TO_FAR_END,
        /*移动时：从远处往唱盘移动*/
        TO_NEAR_END,
        /*静止时：离开唱盘*/
        IN_FAR_END,
        /*静止时：贴近唱盘*/
        IN_NEAR_END
    }

    /*音乐当前的状态：只有播放、暂停、停止三种*/
    public enum MusicStatus {
        PLAY, PAUSE, STOP
    }

    /*DiscView需要触发的音乐切换状态：播放、暂停、上/下一首、停止*/
    public enum MusicChangedStatus {
        PLAY, PAUSE, NEXT, LAST, STOP
    }

    public interface IPlayInfo {
        /*用于更新标题栏变化*/
        public void onMusicInfoChanged(String musicName, String musicAuthor);
        /*用于更新背景图片*/
        public void onMusicPicChanged(int musicPicRes);
        /*用于更新音乐播放状态*/
        public void onMusicChanged(MusicChangedStatus musicChangedStatus);
    }

    public DiscView(Context context) {
        this(context, null);
    }

    public DiscView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public DiscView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mScreenWidth = DisplayUtil.getScreenWidth(context);
        mScreenHeight = DisplayUtil.getScreenHeight(context);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();

        initDiscBlackground();
        initViewPager();
        initNeedle();
        initObjectAnimator();
    }

    private void initDiscBlackground() {
        ImageView mDiscBlackground = (ImageView) findViewById(R.id.ivDiscBlackgound);
        mDiscBlackground.setImageDrawable(getDiscBlackgroundDrawable());

        int marginTop = (int) (DisplayUtil.SCALE_DISC_MARGIN_TOP * mScreenHeight);
        RelativeLayout.LayoutParams layoutParams = (LayoutParams) mDiscBlackground
                .getLayoutParams();
        layoutParams.setMargins(0, marginTop, 0, 0);

        mDiscBlackground.setLayoutParams(layoutParams);
    }

    private void initViewPager() {
        mViewPagerAdapter = new ViewPagerAdapter();
        mVpContain = (ViewPager) findViewById(R.id.vpDiscContain);
        mVpContain.setOverScrollMode(View.OVER_SCROLL_NEVER);
        mVpContain.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            int lastPositionOffsetPixels = 0;
            int currentItem = 0;
            @Override
            public void onPageScrolled(int position, float positionOffset, int
                    positionOffsetPixels) {
                //左滑
                if (lastPositionOffsetPixels > positionOffsetPixels) {
                    if (positionOffset < 0.5) {
                        notifyMusicInfoChanged(position);
                    } else {
                        notifyMusicInfoChanged(mVpContain.getCurrentItem());
                    }
                }
                //右滑
                else if (lastPositionOffsetPixels < positionOffsetPixels) {
                    if (positionOffset > 0.5) {
                        notifyMusicInfoChanged(position + 1);
                    } else {
                        notifyMusicInfoChanged(position);
                    }
                }
                lastPositionOffsetPixels = positionOffsetPixels;
            }

            @Override
            public void onPageSelected(int position) {
                resetOtherDiscAnimation(position);
                notifyMusicPicChanged(position);
                if (position > currentItem) {
                    notifyMusicStatusChanged(MusicChangedStatus.NEXT);
                } else {
                    notifyMusicStatusChanged(MusicChangedStatus.LAST);
                }
                currentItem = position;
            }

            @Override
            public void onPageScrollStateChanged(int state) {
                doWithAnimatorOnPageScroll(state);
            }
        });
        mVpContain.setAdapter(mViewPagerAdapter);

        RelativeLayout.LayoutParams layoutParams = (LayoutParams) mVpContain.getLayoutParams();
        int marginTop = (int) (DisplayUtil.SCALE_DISC_MARGIN_TOP * mScreenHeight);
        layoutParams.setMargins(0, marginTop, 0, 0);
        mVpContain.setLayoutParams(layoutParams);
    }

    /**
     * 取消其他页面上的动画，并将图片旋转角度复原
     */
    private void resetOtherDiscAnimation(int position) {
        for (int i = 0; i < mDiscLayouts.size(); i++) {
            if (position == i) continue;
            mDiscAnimators.get(position).cancel();
            ImageView imageView = (ImageView) mDiscLayouts.get(i).findViewById(R.id.ivDisc);
            imageView.setRotation(0);
        }
    }

    private void doWithAnimatorOnPageScroll(int state) {
        switch (state) {
            case ViewPager.SCROLL_STATE_IDLE:
            case ViewPager.SCROLL_STATE_SETTLING: {
                mViewPagerIsOffset = false;
                if (musicStatus == MusicStatus.PLAY) {
                    playAnimator();
                }
                break;
            }
            case ViewPager.SCROLL_STATE_DRAGGING: {
                mViewPagerIsOffset = true;
                pauseAnimator();
                break;
            }
        }
    }

    private void initNeedle() {
        mIvNeedle = (ImageView) findViewById(R.id.ivNeedle);

        int needleWidth = (int) (DisplayUtil.SCALE_NEEDLE_WIDTH * mScreenWidth);
        int needleHeight = (int) (DisplayUtil.SCALE_NEEDLE_HEIGHT * mScreenHeight);

        /*设置手柄的外边距为负数，让其隐藏一部分*/
        int marginTop = (int) (DisplayUtil.SCALE_NEEDLE_MARGIN_TOP * mScreenHeight) * -1;
        int marginLeft = (int) (DisplayUtil.SCALE_NEEDLE_MARGIN_LEFT * mScreenWidth);

        Bitmap originBitmap = BitmapFactory.decodeResource(getResources(), R.drawable
                .ic_needle);
        Bitmap bitmap = Bitmap.createScaledBitmap(originBitmap, needleWidth, needleHeight, false);

        RelativeLayout.LayoutParams layoutParams = (LayoutParams) mIvNeedle.getLayoutParams();
        layoutParams.setMargins(marginLeft, marginTop, 0, 0);

        int pivotX = (int) (DisplayUtil.SCALE_NEEDLE_PIVOT_X * mScreenWidth);
        int pivotY = (int) (DisplayUtil.SCALE_NEEDLE_PIVOT_Y * mScreenWidth);

        mIvNeedle.setPivotX(pivotX);
        mIvNeedle.setPivotY(pivotY);
        mIvNeedle.setRotation(DisplayUtil.ROTATION_INIT_NEEDLE);
        mIvNeedle.setImageBitmap(bitmap);
        mIvNeedle.setLayoutParams(layoutParams);
    }

    private void initObjectAnimator() {
        mNeedleAnimator = ObjectAnimator.ofFloat(mIvNeedle, View.ROTATION, DisplayUtil
                .ROTATION_INIT_NEEDLE, 0);
        mNeedleAnimator.setDuration(DURATION_NEEDLE_ANIAMTOR);
        mNeedleAnimator.setInterpolator(new AccelerateInterpolator());
        mNeedleAnimator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animator) {
                /**
                 * 根据动画开始前NeedleAnimatorStatus的状态，
                 * 即可得出动画进行时NeedleAnimatorStatus的状态
                 * */
                if (needleAnimatorStatus == NeedleAnimatorStatus.IN_FAR_END) {
                    needleAnimatorStatus = NeedleAnimatorStatus.TO_NEAR_END;
                } else if (needleAnimatorStatus == NeedleAnimatorStatus.IN_NEAR_END) {
                    needleAnimatorStatus = NeedleAnimatorStatus.TO_FAR_END;
                }
            }

            @Override
            public void onAnimationEnd(Animator animator) {

                if (needleAnimatorStatus == NeedleAnimatorStatus.TO_NEAR_END) {
                    needleAnimatorStatus = NeedleAnimatorStatus.IN_NEAR_END;
                    int index = mVpContain.getCurrentItem();
                    playDiscAnimator(index);
                    musicStatus = MusicStatus.PLAY;
                } else if (needleAnimatorStatus == NeedleAnimatorStatus.TO_FAR_END) {
                    needleAnimatorStatus = NeedleAnimatorStatus.IN_FAR_END;
                    if (musicStatus == MusicStatus.STOP) {
                        mIsNeed2StartPlayAnimator = true;
                    }
                }

                if (mIsNeed2StartPlayAnimator) {
                    mIsNeed2StartPlayAnimator = false;
                    /**
                     * 只有在ViewPager不处于偏移状态时，才开始唱盘旋转动画
                     * */
                    if (!mViewPagerIsOffset) {
                        /*延时500ms*/
                        DiscView.this.postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                playAnimator();
                            }
                        }, 50);
                    }
                }
            }

            @Override
            public void onAnimationCancel(Animator animator) {

            }

            @Override
            public void onAnimationRepeat(Animator animator) {

            }
        });
    }

    public void setPlayInfoListener(IPlayInfo listener) {
        this.mIPlayInfo = listener;
    }

    /*得到唱盘背后半透明的圆形背景*/
    private Drawable getDiscBlackgroundDrawable() {
        int discSize = (int) (mScreenWidth * DisplayUtil.SCALE_DISC_SIZE);
        Bitmap bitmapDisc = Bitmap.createScaledBitmap(BitmapFactory.decodeResource(getResources(), R
                .drawable.ic_disc_blackground), discSize, discSize, false);
        RoundedBitmapDrawable roundDiscDrawable = RoundedBitmapDrawableFactory.create
                (getResources(), bitmapDisc);
        return roundDiscDrawable;
    }

    /**
     * 得到唱盘图片
     * 唱盘图片由空心圆盘及音乐专辑图片“合成”得到
     */
    private Drawable getDiscDrawable(int musicPicRes) {
        int discSize = (int) (mScreenWidth * DisplayUtil.SCALE_DISC_SIZE);
        int musicPicSize = (int) (mScreenWidth * DisplayUtil.SCALE_MUSIC_PIC_SIZE);

        Bitmap bitmapDisc = Bitmap.createScaledBitmap(BitmapFactory.decodeResource(getResources(), R
                .drawable.ic_disc), discSize, discSize, false);
        Bitmap bitmapMusicPic = getMusicPicBitmap(musicPicSize,musicPicRes);
        BitmapDrawable discDrawable = new BitmapDrawable(bitmapDisc);
        RoundedBitmapDrawable roundMusicDrawable = RoundedBitmapDrawableFactory.create
                (getResources(), bitmapMusicPic);

        //抗锯齿
        discDrawable.setAntiAlias(true);
        roundMusicDrawable.setAntiAlias(true);

        Drawable[] drawables = new Drawable[2];
        drawables[0] = roundMusicDrawable;
        drawables[1] = discDrawable;

        LayerDrawable layerDrawable = new LayerDrawable(drawables);
        int musicPicMargin = (int) ((DisplayUtil.SCALE_DISC_SIZE - DisplayUtil
                .SCALE_MUSIC_PIC_SIZE) * mScreenWidth / 2);
        //调整专辑图片的四周边距，让其显示在正中
        layerDrawable.setLayerInset(0, musicPicMargin, musicPicMargin, musicPicMargin,
                musicPicMargin);

        return layerDrawable;
    }

    private Bitmap getMusicPicBitmap(int musicPicSize, int musicPicRes) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;

        BitmapFactory.decodeResource(getResources(),musicPicRes,options);
        int imageWidth = options.outWidth;

        int sample = imageWidth / musicPicSize;
        int dstSample = 1;
        if (sample > dstSample) {
            dstSample = sample;
        }
        options.inJustDecodeBounds = false;
        //设置图片采样率
        options.inSampleSize = dstSample;
        //设置图片解码格式
        options.inPreferredConfig = Bitmap.Config.RGB_565;

        return Bitmap.createScaledBitmap(BitmapFactory.decodeResource(getResources(),
                musicPicRes, options), musicPicSize, musicPicSize, true);
    }

    public void setMusicDataList(List<MusicData> musicDataList) {
        if (musicDataList.isEmpty()) return;

        mDiscLayouts.clear();
        mMusicDatas.clear();
        mDiscAnimators.clear();
        mMusicDatas.addAll(musicDataList);

        int i = 0;
        for (MusicData musicData : mMusicDatas) {
            View discLayout = LayoutInflater.from(getContext()).inflate(R.layout.layout_disc,
                    mVpContain, false);

            ImageView disc = (ImageView) discLayout.findViewById(R.id.ivDisc);
            disc.setImageDrawable(getDiscDrawable(musicData.getMusicPicRes()));

            mDiscAnimators.add(getDiscObjectAnimator(disc, i++));
            mDiscLayouts.add(discLayout);
        }
        mViewPagerAdapter.notifyDataSetChanged();

        MusicData musicData = mMusicDatas.get(0);
        if (mIPlayInfo != null) {
            mIPlayInfo.onMusicInfoChanged(musicData.getMusicName(), musicData.getMusicAuthor());
            mIPlayInfo.onMusicPicChanged(musicData.getMusicPicRes());
        }
    }

    private ObjectAnimator getDiscObjectAnimator(ImageView disc, final int i) {
        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(disc, View.ROTATION, 0, 360);
        objectAnimator.setRepeatCount(ValueAnimator.INFINITE);
        objectAnimator.setDuration(20 * 1000);
        objectAnimator.setInterpolator(new LinearInterpolator());

        return objectAnimator;
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
    }

    /*播放动画*/
    private void playAnimator() {
        /*唱针处于远端时，直接播放动画*/
        if (needleAnimatorStatus == NeedleAnimatorStatus.IN_FAR_END) {
            mNeedleAnimator.start();
        }
        /*唱针处于往远端移动时，设置标记，等动画结束后再播放动画*/
        else if (needleAnimatorStatus == NeedleAnimatorStatus.TO_FAR_END) {
            mIsNeed2StartPlayAnimator = true;
        }
    }

    /*暂停动画*/
    private void pauseAnimator() {
        /*播放时暂停动画*/
        if (needleAnimatorStatus == NeedleAnimatorStatus.IN_NEAR_END) {
            int index = mVpContain.getCurrentItem();
            pauseDiscAnimatior(index);
        }
        /*唱针往唱盘移动时暂停动画*/
        else if (needleAnimatorStatus == NeedleAnimatorStatus.TO_NEAR_END) {
            mNeedleAnimator.reverse();
            /**
             * 若动画在没结束时执行reverse方法，则不会执行监听器的onStart方法，此时需要手动设置
             * */
            needleAnimatorStatus = NeedleAnimatorStatus.TO_FAR_END;
        }
        /**
         * 动画可能执行多次，只有音乐处于停止 / 暂停状态时，才执行暂停命令
         * */
        if (musicStatus == MusicStatus.STOP) {
            notifyMusicStatusChanged(MusicChangedStatus.STOP);
        }else if (musicStatus == MusicStatus.PAUSE) {
            notifyMusicStatusChanged(MusicChangedStatus.PAUSE);
        }
    }

    /*播放唱盘动画*/
    private void playDiscAnimator(int index) {
        ObjectAnimator objectAnimator = mDiscAnimators.get(index);
        if (objectAnimator.isPaused()) {
            objectAnimator.resume();
        } else {
            objectAnimator.start();
        }
        /**
         * 唱盘动画可能执行多次，只有不是音乐不在播放状态，在回调执行播放
         * */
        if (musicStatus != MusicStatus.PLAY) {
            notifyMusicStatusChanged(MusicChangedStatus.PLAY);
        }
    }

    /*暂停唱盘动画*/
    private void pauseDiscAnimatior(int index) {
        ObjectAnimator objectAnimator = mDiscAnimators.get(index);
        objectAnimator.pause();
        mNeedleAnimator.reverse();
    }

    public void notifyMusicInfoChanged(int position) {
        if (mIPlayInfo != null) {
            MusicData musicData = mMusicDatas.get(position);
            mIPlayInfo.onMusicInfoChanged(musicData.getMusicName(), musicData.getMusicAuthor());
        }
    }

    public void notifyMusicPicChanged(int position) {
        if (mIPlayInfo != null) {
            MusicData musicData = mMusicDatas.get(position);
            mIPlayInfo.onMusicPicChanged(musicData.getMusicPicRes());
        }
    }

    public void notifyMusicStatusChanged(MusicChangedStatus musicChangedStatus) {
        if (mIPlayInfo != null) {
            mIPlayInfo.onMusicChanged(musicChangedStatus);
        }
    }

    private void play() {
        playAnimator();
    }

    private void pause() {
        musicStatus = MusicStatus.PAUSE;
        pauseAnimator();
    }

    public void stop() {
        musicStatus = MusicStatus.STOP;
        pauseAnimator();
    }

    public void playOrPause() {
        if (musicStatus == MusicStatus.PLAY) {
            pause();
        } else {
            play();
        }
    }

    public void next() {
        int currentItem = mVpContain.getCurrentItem();
        if (currentItem == mMusicDatas.size() - 1) {
            Toast.makeText(getContext(), "已经到达最后一首", Toast.LENGTH_SHORT).show();
        } else {
            selectMusicWithButton();
            mVpContain.setCurrentItem(currentItem + 1, true);
        }
    }

    public void last() {
        int currentItem = mVpContain.getCurrentItem();
        if (currentItem == 0) {
            Toast.makeText(getContext(), "已经到达第一首", Toast.LENGTH_SHORT).show();
        } else {
            selectMusicWithButton();
            mVpContain.setCurrentItem(currentItem - 1, true);
        }
    }

    public boolean isPlaying() {
        return musicStatus == MusicStatus.PLAY;
    }

    private void selectMusicWithButton() {
        if (musicStatus == MusicStatus.PLAY) {
            mIsNeed2StartPlayAnimator = true;
            pauseAnimator();
        } else if (musicStatus == MusicStatus.PAUSE) {
            play();
        }
    }

    class ViewPagerAdapter extends PagerAdapter {

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View discLayout = mDiscLayouts.get(position);
            container.addView(discLayout);
            return discLayout;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView(mDiscLayouts.get(position));
        }

        @Override
        public int getCount() {
            return mDiscLayouts.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }
    }
}

BackgourndAnimationRelativeLayout

import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.os.Build;
import android.util.AttributeSet;
import android.view.animation.AccelerateInterpolator;
import android.widget.RelativeLayout;

import com.rookie.shiyue20180528.R;

/**
 * Created by 暗夜 on 2018/5/28.
 */

public class BackgourndAnimationRelativeLayout extends RelativeLayout {

    private final int DURATION_ANIMATION = 500;
    private final int INDEX_BACKGROUND = 0;
    private final int INDEX_FOREGROUND = 1;
    /**
     * LayerDrawable[0]: background drawable
     * LayerDrawable[1]: foreground drawable
     */
    private LayerDrawable layerDrawable;
    private ObjectAnimator objectAnimator;
    private int musicPicRes = -1;

    public BackgourndAnimationRelativeLayout(Context context) {
        this(context, null);
    }

    public BackgourndAnimationRelativeLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public BackgourndAnimationRelativeLayout(Context context, AttributeSet attrs, int
            defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initLayerDrawable();
        initObjectAnimator();
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void initLayerDrawable() {
        Drawable backgroundDrawable = getContext().getDrawable(R.drawable.ic_blackground);
        Drawable[] drawables = new Drawable[2];

        /*初始化时先将前景与背景颜色设为一致*/
        drawables[INDEX_BACKGROUND] = backgroundDrawable;
        drawables[INDEX_FOREGROUND] = backgroundDrawable;

        layerDrawable = new LayerDrawable(drawables);
    }

    private void initObjectAnimator() {
        objectAnimator = ObjectAnimator.ofFloat(this, "number", 0f, 1.0f);
        objectAnimator.setDuration(DURATION_ANIMATION);
        objectAnimator.setInterpolator(new AccelerateInterpolator());
        objectAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int foregroundAlpha = (int) ((float) animation.getAnimatedValue() * 255);
                /*动态设置Drawable的透明度，让前景图逐渐显示*/
                layerDrawable.getDrawable(INDEX_FOREGROUND).setAlpha(foregroundAlpha);
                BackgourndAnimationRelativeLayout.this.setBackground(layerDrawable);
            }
        });
        objectAnimator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {
            }

            @Override
            public void onAnimationEnd(Animator animation) {
                /*动画结束后，记得将原来的背景图及时更新*/
                layerDrawable.setDrawable(INDEX_BACKGROUND, layerDrawable.getDrawable(
                        INDEX_FOREGROUND));
            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });
    }

    public void setForeground(Drawable drawable) {
        layerDrawable.setDrawable(INDEX_FOREGROUND, drawable);
    }

    //对外提供方法，用于开始渐变动画
    public void beginAnimation() {
        objectAnimator.start();
    }

    public boolean isNeed2UpdateBackground(int musicPicRes) {
        if (this.musicPicRes == -1) return true;
        if (musicPicRes != this.musicPicRes) {
            return true;
        }
        return false;
    }
}

activity_main.xml

<自定义ourndAnimationRelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rootLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/ic_blackground"
    android:fitsSystemWindows="true"
    >

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolBar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:layout_alignParentTop="true"
        android:background="@android:color/transparent"
        app:subtitleTextAppearance="@style/netease_toolbar_subtitle"
        app:titleTextAppearance="@style/netease_toolbar_title"
        />

    <View
        android:layout_width="match_parent"
        android:layout_height="0.5dp"
        android:layout_below="@id/toolBar"
        android:background="#33ffffff"/>

    <include
        android:id="@+id/discview"
        layout="@layout/layout_discview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/rlMusicTime"
        android:layout_below="@id/toolBar"/>

    <RelativeLayout
        android:id="@+id/rlMusicTime"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/llPlayOption"
        android:layout_marginEnd="15dp"
        android:layout_marginStart="15dp"
        android:layout_marginTop="10dp">

        <TextView
            android:id="@+id/tvCurrentTime"
            style="@style/neteasa_music_time_text_sytle"
            android:layout_alignParentStart="true"
            android:layout_centerVertical="true"
            tools:text="01:34"/>

        <SeekBar
            android:id="@+id/musicSeekBar"
            style="@style/neteasa_music_time_seek_bar_sytle"
            android:layout_centerInParent="true"
            android:layout_toEndOf="@id/tvCurrentTime"
            android:layout_toStartOf="@+id/tvTotalTime"
            android:paddingEnd="15dp"
            android:paddingStart="15dp"
            />

        <TextView
            android:id="@+id/tvTotalTime"
            style="@style/neteasa_music_time_text_sytle"
            android:layout_alignParentEnd="true"
            android:layout_centerVertical="true"
            tools:text="05:34"/>
    </RelativeLayout>

    <LinearLayout
        android:id="@+id/llPlayOption"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center"
        android:orientation="horizontal"
        android:paddingBottom="20dp"
        android:paddingLeft="20dp"
        android:paddingRight="20dp"
        android:paddingTop="10dp"
        >

        <ImageView
            android:id="@+id/ivLast"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_last"/>

        <ImageView
            android:id="@+id/ivPlayOrPause"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="10dp"
            android:layout_marginStart="10dp"
            android:src="@drawable/ic_play"/>

        <ImageView
            android:id="@+id/ivNext"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_next"/>
    </LinearLayout>


</自定义.model.BackgourndAnimationRelativeLayout>

layout_disc.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/ivDisc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

layout_discview.xml

<com.自定义DiscView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <!--底盘-->
    <ImageView
        android:id="@+id/ivDiscBlackgound"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        />

    <!--实现切换-->
    <android.support.v4.view.ViewPager
        android:id="@+id/vpDiscContain"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        />

    <!--唱针-->
    <ImageView
        android:id="@+id/ivNeedle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_needle"/>

</com.自定义el.DiscView>

raw文件中放入本地音乐,自己从里面取资源文件
GitHub地址 https://github.com/Liuwei333/fangmusic