Android 仿微信，朋友圈右滑退出

直接上代码：

public class SlideLinearLayout extends LinearLayout {    private Logger log = Logger.getLogger(SlideLinearLayout.class.getName());    private Scroller mScroller;    private ViewGroup mParentView;    private float downX;    private float downY;    private float tempX;    private int viewWidth;    private boolean isSilding;    private int mTouchSlop;    private boolean isFinish;    private int MIN_DISTANCE;    private float mLastMotionX;    private float mLastMotionY;    private int mActivePointerId = INVALID_POINTER;    private boolean mIsBeingDragged = false;    private static final int INVALID_POINTER = -1;    private OnListener onListener;    public SlideLinearLayout(Context context) {        super(context);        init();    }    public SlideLinearLayout(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public SlideLinearLayout(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        super.onLayout(changed, l, t, r, b);        if (changed) {            mParentView = (ViewGroup) this.getParent();            viewWidth = this.getWidth();        }    }    /**     * 滚动出界面     */    private void scrollRight() {        final int delta = (viewWidth + mParentView.getScrollX());        // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item        mScroller.startScroll(mParentView.getScrollX(), 0, -delta + 1, 0,                Math.abs(delta));        postInvalidate();    }    /**     * 滚动到起始位置     */    private void scrollOrigin() {        int delta = mParentView.getScrollX();        mScroller.startScroll(mParentView.getScrollX(), 0, -delta, 0,                Math.abs(delta));        postInvalidate();    }    private void init() {        mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();        mScroller = new Scroller(getContext());        MIN_DISTANCE = DisplayUtil.dip2px(getContext(), 30);    }    @Override    public boolean onInterceptTouchEvent(MotionEvent ev) {        log.debug("onInterceptTouchEvent event: " + ev.getAction());        final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;        if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {            // Release the drag.            resetTouch();            return false;        }        if (action != MotionEvent.ACTION_DOWN) {            if (mIsBeingDragged) {                return true;            }        }        switch (action) {            case MotionEvent.ACTION_MOVE: {                final int activePointerId = mActivePointerId;                if (activePointerId == INVALID_POINTER) {                    // If we don't have a valid id, the touch down wasn't on content.                    break;                }                final int pointerIndex = ev.findPointerIndex(activePointerId);                final float x = ev.getX(pointerIndex);                final float xDiff = Math.abs(x - mLastMotionX);                if (xDiff > mTouchSlop && mLastMotionX <= MIN_DISTANCE) {                    mIsBeingDragged = true;                    return true;                }                break;            }            case MotionEvent.ACTION_DOWN: {                downX = tempX = mLastMotionX = ev.getX();                downY = mLastMotionY = ev.getY();                mActivePointerId = ev.getPointerId(0);                break;            }        }        return super.onInterceptTouchEvent(ev);    }    private void resetTouch() {        mLastMotionX = 0;        mLastMotionY = 0;        mActivePointerId = INVALID_POINTER;        mIsBeingDragged = false;        tempX = 0;        downX = 0;        downY = 0;    }    @Override    public void computeScroll() {        // 调用startScroll的时候scroller.computeScrollOffset()返回true，        if (mScroller.computeScrollOffset()) {            mParentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());            postInvalidate();        }    }    @Override    public boolean onTouchEvent(MotionEvent event) {        log.info("onTouchEvent " + event.getAction());        switch (event.getAction()) {            case MotionEvent.ACTION_MOVE:                int moveX = (int) event.getRawX();                int deltaX = (int) (tempX - moveX);                tempX = moveX;                if (Math.abs(moveX - downX) > mTouchSlop) {                    isSilding = true;                }                if (moveX - downX >= 0 && isSilding) {                    mParentView.scrollBy(deltaX, 0);                    log.info("moveX: " + moveX + " deltaX: " + deltaX);                } else {                    log.error("moveX: " + (moveX - downX) + " isSilding: " + isSilding);                }                break;            case MotionEvent.ACTION_UP:                isSilding = false;                if (event.getRawX() > viewWidth / 2) {                    isFinish = true;                    scrollRight();                    if (onListener != null) {                        onListener.OnFinish();                    }                } else {                    scrollOrigin();                    isFinish = false;                }                resetTouch();                break;            case MotionEvent.ACTION_CANCEL:                break;        }        return true;    }    public void setOnListener(OnListener onListener) {        this.onListener = onListener;    }    public interface OnListener {        void OnFinish();    }}

将此布局设置为activity根布局，即可实现效果。
注意要把activity 的背景设置为透明。

<style name="transparent_background" parent="@style/Theme.AppCompat.NoActionBar">        <item name="android:windowBackground">@color/transparent_color</item>        <item name="android:windowNoTitle">true</item>        <item name="android:windowIsTranslucent">true</item></style>

可利用以上代码进行设置！