Android开发之本地音乐播放器（二）

版权声明：转载请标明链接， https://blog.csdn.net/qq_43433255/article/details/88102154

此次音乐播放器是针对上一个：https://blog.csdn.net/qq_43433255/article/details/88084420
开发出来的一个功能增强型，基本实现功能为：

1. 通过列表管理SD中的音乐文件。
2. 通过seekbar可以显示一首音乐的播放进度。
3. 通过seekbar实现音乐播放的进度控制
4. 根据不同的音乐切换背景图片

界面设计部分：


activity_main的代码为：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.shaoyangyang.shaoshuaih.MainActivity">

    <LinearLayout
        android:id="@+id/main_top_linlayout"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="@color/reddemo">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <ImageView
                    android:id="@+id/main_menu_imgv"
                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="15dp"
                    android:src="@mipmap/ic_menu" />

                <TextView
                    android:id="@+id/main_logic_tv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentRight="true"
                    android:layout_centerVertical="true"
                    android:layout_marginRight="10dp"
                    android:text="我的音乐"
                    android:textColor="@color/white"
                    android:textSize="25dp" />


            </RelativeLayout>


        </LinearLayout>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <TextView
                    android:id="@+id/main_online_tv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="10dp"
                    android:text="在线音乐"
                    android:textColor="@color/white_60P"
                    android:textSize="25dp" />

                <ImageView
                    android:id="@+id/main_search_imgv"
                    android:layout_width="40dp"
                    android:layout_height="40dp"
                    android:layout_alignParentRight="true"
                    android:layout_centerVertical="true"
                    android:layout_marginRight="10dp"
                    android:src="@mipmap/ic_menu_search" />


            </RelativeLayout>


        </LinearLayout>

    </LinearLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/main_vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </android.support.v4.view.ViewPager>


</LinearLayout>

acticity_music的代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.shaoyangyang.shaoshuaih.MusicActivity">

    <ImageView
        android:id="@+id/music_bg_imgv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"
        android:src="@mipmap/touxiang1" />

    <RelativeLayout
        android:id="@+id/music_relativelayout"
        android:layout_width="match_parent"
        android:layout_height="50dp">

        <ImageView
            android:id="@+id/music_down_imgv"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_alignParentLeft="true"
            android:layout_margin="10dp"
            android:src="@mipmap/ic_arrow_down" />

        <TextView
            android:id="@+id/music_title_tv"
            android:layout_width="match_parent"
            android:layout_height="28dp"
            android:layout_toRightOf="@+id/music_down_imgv"
            android:text="周杰伦"
            android:textColor="#ffffff"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/music_artist_tv"
            android:layout_width="match_parent"
            android:layout_height="22dp"
            android:layout_below="@+id/music_title_tv"
            android:layout_marginLeft="8dp"
            android:layout_toRightOf="@+id/music_down_imgv"
            android:text="告白气球"
            android:textColor="#ffffff"
            android:textSize="15sp" />



    </RelativeLayout>
    <RelativeLayout
        android:layout_width="350dp"
        android:layout_height="500dp"
        android:layout_above="@+id/music_linlayout"
        android:layout_below="@+id/music_relativelayout"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true">

        <ImageView
            android:id="@+id/music_disc_imagv"
            android:layout_width="match_parent"
            android:layout_height="300dp"
            android:layout_marginTop="100dp"
            android:src="@mipmap/play_page_disc" />

        <ImageView
            android:id="@+id/music_needle_imag"
            android:layout_width="150dp"
            android:layout_height="159dp"
            android:layout_marginLeft="132dp"
            android:src="@mipmap/play_page_needle" />
    </RelativeLayout>

    <LinearLayout
        android:id="@+id/music_linlayout"
        android:layout_width="match_parent"
        android:layout_height="90dp"
        android:layout_alignParentBottom="true"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="5"
            android:orientation="horizontal">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <TextView
                    android:id="@+id/music_current_tv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="10dp"
                    android:text="00:00"
                    android:textColor="#ffffff" />

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="10dp"
                    android:layout_marginRight="10dp"
                    android:layout_toLeftOf="@+id/music_total_tv"
                    android:layout_toRightOf="@+id/music_current_tv">

                    <SeekBar
                        android:id="@+id/music_seekbar"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent" />


                </LinearLayout>

                <TextView
                    android:id="@+id/music_total_tv"
                    android:layout_width="50dp"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="10dp"
                    android:layout_alignParentRight="true"
                    android:text="10:20"
                    android:textColor="#ffffff" />


            </RelativeLayout>


        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="10">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <ImageView
                    android:id="@+id/music_play_btn_loop_img"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="10dp"
                    android:src="@mipmap/ic_play_btn_loop" />

                <ImageView
                    android:id="@+id/music_prev_imgv"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:layout_centerVertical="true"
                    android:layout_toRightOf="@+id/music_play_btn_loop_img"
                    android:src="@drawable/seach_btn_pre" />

                <ImageView
                    android:id="@+id/music_pause_imgv"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:layout_centerHorizontal="true"
                    android:layout_centerVertical="true"
                    android:src="@drawable/seach_btn_pause" />

                <ImageView
                    android:id="@+id/music_next_imgv"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="25dp"
                    android:layout_toRightOf="@id/music_pause_imgv"
                    android:src="@drawable/seach_btn_next" />

            </RelativeLayout>


        </LinearLayout>


    </LinearLayout>


</RelativeLayout>

mainactivity.java的代码：

package com.example.shaoyangyang.shaoshuaih;

import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.content.DialogInterface;
import android.media.Image;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;


import com.example.shaoyangyang.shaoshuaih.adapter.MusicPagerAdapter;
import com.example.shaoyangyang.shaoshuaih.fragment.LogicFragment;
import com.example.shaoyangyang.shaoshuaih.fragment.OnlineFragment;

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

//实现OnClickListener的接口
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    //定义activity_main.xml的控件对象
    private TextView logicTv;
    private TextView onlineTv;
    private ViewPager viewPager;
    private ImageView menuImagv;
    private ImageView seachImagv;
    private Calendar calendar;
    //将Fragment放入List集合中，存放fragment对象
    private List<Fragment> fragmentList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //绑定id
        bangdingID();
        //设置监听
        jianting();
        //创建fragment对象
        LogicFragment logicFragment = new LogicFragment();
        OnlineFragment onlineFragment = new OnlineFragment();
        //将fragment对象添加到fragmentList中
        fragmentList.add(logicFragment);
        fragmentList.add(onlineFragment);
        //通过MusicPagerAdapter类创建musicPagerAdapter的适配器，下面我将添加MusicPagerAdapter类的创建方法
        MusicPagerAdapter musicPagerAdapter = new MusicPagerAdapter(getSupportFragmentManager(), fragmentList);
        //viewPager绑定适配器
        viewPager.setAdapter(musicPagerAdapter);
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                switch (position) {
                    case 0:
                        logicTv.setTextColor(getResources().getColor(R.color.white));
                        onlineTv.setTextColor(getResources().getColor(R.color.white_60P));
                        break;
                    case 1:
                        onlineTv.setTextColor(getResources().getColor(R.color.white));
                        logicTv.setTextColor(getResources().getColor(R.color.white_60P));
                        break;
                }

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });


    }

    private void jianting() {
        logicTv.setOnClickListener(this);
        onlineTv.setOnClickListener(this);
        menuImagv.setOnClickListener(this);
        seachImagv.setOnClickListener(this);
    }

    private void bangdingID() {
        logicTv = findViewById(R.id.main_logic_tv);
        onlineTv = findViewById(R.id.main_online_tv);
        viewPager = findViewById(R.id.main_vp);
        menuImagv = findViewById(R.id.main_menu_imgv);
        seachImagv = findViewById(R.id.main_search_imgv);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.main_logic_tv:
                //实现点击TextView切换fragment
                viewPager.setCurrentItem(0);
                break;
            case R.id.main_online_tv:
                viewPager.setCurrentItem(1);
                break;
            case R.id.main_menu_imgv:
                calendar = Calendar.getInstance();
                int year = calendar.get(Calendar.YEAR);
                int month = calendar.get(Calendar.MONTH);
                int day = calendar.get(Calendar.DAY_OF_MONTH);
                DatePickerDialog datePickerDialog = new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {

                        Toast.makeText(MainActivity.this, "所选择的日期是：" + year + "-" + (month + 1) + "-" + dayOfMonth, Toast.LENGTH_SHORT).show();

                    }
                }, year, month, day);
                datePickerDialog.show();
                break;
            case R.id.main_search_imgv:
                calendar = Calendar.getInstance();
                int hour = calendar.get(Calendar.HOUR);
                int minute = calendar.get(Calendar.MINUTE);
                TimePickerDialog timePickerDialog = new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                        Toast.makeText(MainActivity.this, "所选择的时间是：" + hourOfDay + ":" + minute, Toast.LENGTH_SHORT).show();

                    }
                }, hour, minute, true);
                timePickerDialog.show();
                break;
            default:
                break;
        }

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_HOME) {
            final View view = LayoutInflater.from(this).inflate(R.layout.dialog1_layout, null);
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("退出提示");
            builder.setView(view);
            builder.setPositiveButton("能", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    finish();
                }
            });
            builder.setNegativeButton("不能", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Toast.makeText(MainActivity.this, "且看曼城分分 钟打你脸", Toast.LENGTH_SHORT).show();

                }
            });
            builder.show();
        }
        return super.onKeyDown(keyCode, event);
    }
}

musicactivity。java的代码：

package com.example.shaoyangyang.shaoshuaih;

import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaPlayer;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

import com.example.shaoyangyang.shaoshuaih.entity.Music;
import com.example.shaoyangyang.shaoshuaih.utils.BlurUtil;
import com.example.shaoyangyang.shaoshuaih.utils.Common;
import com.example.shaoyangyang.shaoshuaih.utils.MergeImage;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MusicActivity extends AppCompatActivity implements View.OnClickListener {
    //定义activity_music.xml的控件对象
    //设置音乐播放模式
    private int i = 0;
    private int playMode = 0;
    private int buttonWitch = 0;
    private ImageView bgImgv;
    private TextView titleTv;
    private TextView artistTv;
    private TextView currrentTv;
    private TextView totalTv;
    private ImageView prevImgv;
    private ImageView nextImgv;
    private int position;
    private ImageView discImagv;
    private ImageView needleImagv;
    private MediaPlayer mediaPlayer;
    private ImageView pauseImgv;
    private ImageView downImg;
    private ImageView styleImg;
    private SeekBar seekBar;
    private int totaltime;
    private boolean isStop;
    private ObjectAnimator objectAnimator = null;
    private RotateAnimation rotateAnimation = null;
    private RotateAnimation rotateAnimation2 = null;
    private String TAG = "MusicActivity";
    //Handler实现向主线程进行传值
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {

            super.handleMessage(msg);
            seekBar.setProgress((int) (msg.what));
            currrentTv.setText(formatTime(msg.what));
        }
    };

    //MusicActivity onCreate（）方法
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_music);


        bingID();                                                                           //调用bingID();方法实现对控件的绑定

        Intent intent = getIntent();                                                    //通过getIntent()方法实现intent信息的获取
        position = intent.getIntExtra("position", 0);            //获取position

        mediaPlayer = new MediaPlayer();
        prevAndnextplaying(Common.musicList.get(position).path);
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {               //seekbar设置监听，实现指哪放到哪
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (fromUser) {
                    mediaPlayer.seekTo(progress);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });


    }

    //prevAndnext() 实现页面的展现
    private void prevAndnextplaying(String path) {
        isStop = false;
        mediaPlayer.reset();
        titleTv.setText(Common.musicList.get(position).title);
        artistTv.setText(Common.musicList.get(position).artist + "--" + Common.musicList.get(position).album);
        pauseImgv.setImageResource(R.mipmap.ic_play_btn_pause);

        if (Common.musicList.get(position).albumBip != null) {
            Bitmap bgbm = BlurUtil.doBlur(Common.musicList.get(position).albumBip, 10, 5);//将专辑虚化
            bgImgv.setImageBitmap(bgbm);                                    //设置虚化后的专辑图片为背景
            Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.mipmap.play_page_disc);//BitmapFactory.decodeResource用于根据给定的资源ID从指定的资源文件中解析、创建Bitmap对象。
            Bitmap bm = MergeImage.mergeThumbnailBitmap(bitmap1, Common.musicList.get(position).albumBip);//将专辑图片放到圆盘中
            discImagv.setImageBitmap(bm);
        } else {
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.touxiang1);
            bgImgv.setImageBitmap(bitmap);
            Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.mipmap.play_page_disc);
            Bitmap bm = MergeImage.mergeThumbnailBitmap(bitmap1, bitmap);
            discImagv.setImageBitmap(bm);
        }
        try {
            mediaPlayer.setDataSource(path);
            mediaPlayer.prepare();                   // 准备
            mediaPlayer.start();                        // 启动
            mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @RequiresApi(api = Build.VERSION_CODES.KITKAT)
                @Override
                public void onCompletion(MediaPlayer mp) {
                    if(!mediaPlayer.isPlaying()){
                        setPlayMode();
                    }

                }
            });
        } catch (IllegalArgumentException | SecurityException | IllegalStateException
                | IOException e) {
            e.printStackTrace();
        }


        totalTv.setText(formatTime(Common.musicList.get(position).length));
        seekBar.setMax(Common.musicList.get(position).length);

        MusicThread musicThread = new MusicThread();                                         //启动线程
        new Thread(musicThread).start();

        //实例化，设置旋转对象
        objectAnimator = ObjectAnimator.ofFloat(discImagv, "rotation", 0f, 360f);
        //设置转一圈要多长时间
        objectAnimator.setDuration(8000);
        //设置旋转速率
        objectAnimator.setInterpolator(new LinearInterpolator());
        //设置循环次数 -1为一直循环
        objectAnimator.setRepeatCount(-1);
        //设置转一圈后怎么转
        objectAnimator.setRepeatMode(ValueAnimator.RESTART);
        objectAnimator.start();

        rotateAnimation = new RotateAnimation(-25f, 0f, Animation.RELATIVE_TO_SELF, 0.3f, Animation.RELATIVE_TO_SELF, 0.1f);
        rotateAnimation.setDuration(500);
        rotateAnimation.setInterpolator(new LinearInterpolator());
        rotateAnimation.setRepeatCount(0);
        rotateAnimation.setFillAfter(true);
        rotateAnimation.setStartOffset(500);
        needleImagv.setAnimation(rotateAnimation);
        rotateAnimation.cancel();


        rotateAnimation2 = new RotateAnimation(0f, -25f, Animation.RELATIVE_TO_SELF, 0.3f, Animation.RELATIVE_TO_SELF, 0.1f);
        rotateAnimation2.setDuration(500);
        rotateAnimation2.setInterpolator(new LinearInterpolator());
        rotateAnimation2.setRepeatCount(0);
        rotateAnimation2.setFillAfter(true);
        needleImagv.setAnimation(rotateAnimation2);
        rotateAnimation2.cancel();


    }

    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    private void setPlayMode() {
        if (playMode == 0)//全部循环
        {
            if (position == Common.musicList.size() - 1)//默认循环播放
            {
                position = 0;// 第一首
                mediaPlayer.reset();
                objectAnimator.pause();
                needleImagv.startAnimation(rotateAnimation2);
                prevAndnextplaying(Common.musicList.get(position).path);

            } else {
                position++;
                mediaPlayer.reset();
                objectAnimator.pause();
                needleImagv.startAnimation(rotateAnimation2);
                prevAndnextplaying(Common.musicList.get(position).path);
            }
        } else if (playMode == 1)//单曲循环
        {
            //position不需要更改
            mediaPlayer.reset();
            objectAnimator.pause();
            needleImagv.startAnimation(rotateAnimation2);
            prevAndnextplaying(Common.musicList.get(position).path);
        } else if (playMode == 2)//随机
        {
            position = (int) (Math.random() * Common.musicList.size());//随机播放
            mediaPlayer.reset();
            objectAnimator.pause();
            needleImagv.startAnimation(rotateAnimation2);
            prevAndnextplaying(Common.musicList.get(position).path);
        }
    }

    @TargetApi(Build.VERSION_CODES.KITKAT)
    private void setBtnMode() {
        if (playMode == 0)//全部循环
        {
            if (position == Common.musicList.size() - 1)//默认循环播放
            {
                if (buttonWitch == 1) {
                    position--;
                    mediaPlayer.reset();
                    objectAnimator.pause();
                    needleImagv.startAnimation(rotateAnimation2);
                    prevAndnextplaying(Common.musicList.get(position).path);
                } else if (buttonWitch == 2) {
                    position = 0;// 第一首
                    mediaPlayer.reset();
                    objectAnimator.pause();
                    needleImagv.startAnimation(rotateAnimation2);
                    prevAndnextplaying(Common.musicList.get(position).path);
                }
            } else if (position == 0) {
                if (buttonWitch == 1) {
                    position = Common.musicList.size() - 1;
                    mediaPlayer.reset();
                    objectAnimator.pause();
                    needleImagv.startAnimation(rotateAnimation2);
                    prevAndnextplaying(Common.musicList.get(position).path);
                } else if (buttonWitch == 2) {
                    position++;
                    mediaPlayer.reset();
                    objectAnimator.pause();
                    needleImagv.startAnimation(rotateAnimation2);
                    prevAndnextplaying(Common.musicList.get(position).path);
                }
            }else {
                if(buttonWitch ==1){
                    position--;
                    mediaPlayer.reset();
                    objectAnimator.pause();
                    needleImagv.startAnimation(rotateAnimation2);
                    prevAndnextplaying(Common.musicList.get(position).path);

                }else if(buttonWitch ==2){
                    position++;
                    mediaPlayer.reset();
                    objectAnimator.pause();
                    needleImagv.startAnimation(rotateAnimation2);
                    prevAndnextplaying(Common.musicList.get(position).path);
                }
            }
        } else if (playMode == 1)//单曲循环
        {
            //position不需要更改
            mediaPlayer.reset();
            objectAnimator.pause();
            needleImagv.startAnimation(rotateAnimation2);
            prevAndnextplaying(Common.musicList.get(position).path);
        } else if (playMode == 2)//随机
        {
            position = (int) (Math.random() * Common.musicList.size());//随机播放
            mediaPlayer.reset();
            objectAnimator.pause();
            needleImagv.startAnimation(rotateAnimation2);
            prevAndnextplaying(Common.musicList.get(position).path);
        }
    }

    //格式化数字
    private String formatTime(int length) {
        Date date = new Date(length);
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss");    //规定固定的格式
        String totaltime = simpleDateFormat.format(date);
        return totaltime;
    }


    //绑定id，设置监听
    private void bingID() {
        titleTv = findViewById(R.id.music_title_tv);
        artistTv = findViewById(R.id.music_artist_tv);
        bgImgv = findViewById(R.id.music_bg_imgv);
        currrentTv = findViewById(R.id.music_current_tv);
        totalTv = findViewById(R.id.music_total_tv);
        prevImgv = findViewById(R.id.music_prev_imgv);
        nextImgv = findViewById(R.id.music_next_imgv);
        discImagv = findViewById(R.id.music_disc_imagv);
        needleImagv = findViewById(R.id.music_needle_imag);
        pauseImgv = findViewById(R.id.music_pause_imgv);
        downImg = findViewById(R.id.music_down_imgv);
        seekBar = findViewById(R.id.music_seekbar);
        styleImg = findViewById(R.id.music_play_btn_loop_img);
        pauseImgv.setOnClickListener(this);
        prevImgv.setOnClickListener(this);
        nextImgv.setOnClickListener(this);
        downImg.setOnClickListener(this);
        styleImg.setOnClickListener(this);

    }

    //onClick（）点击监听
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.music_prev_imgv:
                buttonWitch = 1;
                setBtnMode();
                break;
            case R.id.music_next_imgv:
                buttonWitch = 2;
                setBtnMode();
                break;
            case R.id.music_pause_imgv:
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.pause();
                    objectAnimator.pause();
                    needleImagv.startAnimation(rotateAnimation2);
                    pauseImgv.setImageResource(R.mipmap.ic_play_btn_play);
                } else {
                    mediaPlayer.start();
                    objectAnimator.resume();
                    needleImagv.startAnimation(rotateAnimation);
                    pauseImgv.setImageResource(R.mipmap.ic_play_btn_pause);
                }
                break;
            case R.id.music_play_btn_loop_img:
                i++;
                if (i % 3 == 1) {
                    Toast.makeText(MusicActivity.this, "单曲循环", Toast.LENGTH_SHORT).show();
                    playMode = 1;
                    styleImg.setImageResource(R.mipmap.ic_play_btn_one);
                }
                if (i % 3 == 2) {
                    Toast.makeText(MusicActivity.this, "随机播放", Toast.LENGTH_SHORT).show();
                    playMode = 2;
                    styleImg.setImageResource(R.mipmap.ic_play_btn_shuffle);
                }
                if (i % 3 == 0) {
                    Toast.makeText(MusicActivity.this, "顺序播放", Toast.LENGTH_SHORT).show();
                    playMode = 0;
                    styleImg.setImageResource(R.mipmap.ic_play_btn_loop);
                }
                break;
            case R.id.music_down_imgv:
                this.finish();
                break;
            default:
                break;
        }

    }

    @Override
    protected void onPause() {
        super.onPause();
        for (Music music : Common.musicList
                ) {
            music.isPlaying = false;
        }
        Common.musicList.get(position).isPlaying = true;
    }

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

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        i = 0;
        isStop = false;
        if (mediaPlayer.isPlaying()) {
            mediaPlayer.stop();
        }
        if (mediaPlayer != null) {
            mediaPlayer.stop();
        }


    }

    //创建一个类MusicThread实现Runnable接口，实现多线程
    class MusicThread implements Runnable {

        @Override
        public void run() {
            while (!isStop && Common.musicList.get(position) != null) {
                try {
                    //让线程睡眠1000毫秒
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                //放送给Handler现在的运行到的时间，进行ui更新
                handler.sendEmptyMessage(mediaPlayer.getCurrentPosition());

            }
        }
    }


}

代码繁多：

贴上一些关键代码提供参考！

最后，音乐播放器的效果图如下：