Android之欢迎界面上滑解锁

Android之欢迎界面上滑解锁

1，写一个类PullDoorView（复制粘贴即可）里面有个图片资源（记得换一下）

public class PullDoorView extends RelativeLayout {

    private Context mcontext;
    private Scroller scroller;
    private ImageView imageView;
    private int CY;
    private int DY;
    private int LDY = 0;
    private int screenWidth = 0;
    private int screenHeigh = 0;
    private boolean closeFlag = false;

    public PullDoorView(Context context) {
        super(context);
        mcontext = context;
        setupView();
    }

    public PullDoorView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mcontext = context;
        setupView();
    }

    @SuppressLint("NewApi")
    private void setupView() {

        // 将Interpolator设置成有弹跳效果
        Interpolator polator = new BounceInterpolator();
        scroller = new Scroller(mcontext, polator);

        // 获取屏幕分辨率
        WindowManager windowManager = (WindowManager) (mcontext
                .getSystemService(Context.WINDOW_SERVICE));
        DisplayMetrics displayMetrics = new DisplayMetrics();
        windowManager.getDefaultDisplay().getMetrics(displayMetrics);
        screenHeigh = displayMetrics.heightPixels;
        screenWidth = displayMetrics.widthPixels;

        // 设置成透明背景
        this.setBackgroundColor(Color.argb(0, 0, 0, 0));
        imageView = new ImageView(mcontext);
        imageView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
                LayoutParams.MATCH_PARENT));
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);// 填充整个屏幕
        imageView.setImageResource(R.drawable.splash); // 默认背景
        addView(imageView);
    }

    // 设置推动门背景
    public void setBgImage(int id) {
        imageView.setImageResource(id);
    }

    // 设置推动门背景
    public void setBgImage(Drawable drawable) {
        imageView.setImageDrawable(drawable);
    }

    // 设置推动门的动画
    public void startBounceAnim(int startY, int dy, int duration) {
        scroller.startScroll(0, startY, 0, dy, duration);
        invalidate();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                LDY = (int) event.getY();
                return true;
            case MotionEvent.ACTION_MOVE:
                CY = (int) event.getY();
                DY = CY - LDY;
                // 上滑有效
                if (DY < 0) {
                    scrollTo(0, -DY);
                }
                break;
            case MotionEvent.ACTION_UP:
                CY = (int) event.getY();
                DY = CY - LDY;
                if (DY < 0) {
                    if (Math.abs(DY) > screenHeigh / 5) {
                        // 向上滑动超过半个屏幕高度时动画消失
                        startBounceAnim(this.getScrollY(), screenHeigh, 450);
                        closeFlag = true;
                    } else {
                        // 向上滑动未超过半个屏幕高度时开启向下弹动动画
                        startBounceAnim(this.getScrollY(), -this.getScrollY(), 1000);
                    }
                }
                break;
        }
        return super.onTouchEvent(event);
    }
    @Override
    public void computeScroll() {
        if (scroller.computeScrollOffset()) {
            scrollTo(scroller.getCurrX(), scroller.getCurrY());
            // 更新界面
            postInvalidate();
        } else {
            if (closeFlag) {
                this.setVisibility(View.GONE);
            }
        }
    }
}

2，创建一个布局文件splash.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainFrame"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff" >
    <include
        android:id="@+id/include_main"
        layout="@layout/activity_main" />
    <com.coolweather.recycleview.starView.PullDoorView
        android:id="@+id/myImage"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#ddd" >
        <TextView
            android:id="@+id/tv_hint"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:layout_marginBottom="10dp"
            android:text="上滑可以进入首页"
            android:textColor="#ffffffff"
            android:textSize="18sp" />
    </com.coolweather.recycleview.starView.PullDoorView>
</FrameLayout>

3，MainActivity:

       
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_main);
        setContentView(R.layout.splash);

4,ok了
我记得是在网上看的，不记得是谁的了，有改动，谢谢