需要包裹1个view视频view ，为第一个child.
videoView = getChildAt(0);
为了防止重新绘制过程中导致被还原，需要做的事情是:
protected void onLayout(boolean changed, int l, int t, int r, int b) {
if(videoView!=null){
if (!isNotFirst) {
initPointPosition.x = videoView.getLeft();
initPointPosition.y = videoView.getTop();
Prt.d(TAG, "first position:x:" + initPointPosition.x + ",y:" + initPointPosition.y);
isNotFirst = true;
}
videoView.layout(initPointPosition.x, initPointPosition.y,
initPointPosition.x + videoView.getMeasuredWidth(),
initPointPosition.y + videoView.getMeasuredHeight());
}
}
//如果是第一次就把初始化position赋值给initPointPosition
/**
* Created by luozheng on 2016/10/13. qssq666.cn Administrator
*/
public class VideoDragContainer extends FrameLayout {
private static final String TAG = "VideoDragContainer";
private ViewDragHelper mDragHelper;
private int mWidth;
private int mHeight;
private View videoView;
private Point initPointPosition = new Point();
private boolean isNotFirst;
private float mPercent = 1f;
public VideoDragContainer(Context context) {
super(context);
init(context);
}
public VideoDragContainer(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public VideoDragContainer(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public VideoDragContainer(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(context);
}
private void init(Context context) {
mDragHelper = ViewDragHelper.create(this, 1f, new ViewDragHelper.Callback() {
@Override
public boolean tryCaptureView(View child, int pointerId) {
// return child instanceof VideoContainer;
// return child instanceof true;
return true;
}
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
Prt.i(TAG, "clampViewPositionHorizontal left:" + left + ",dx:" + dx);
if (left < 0) {
return 0;
} else if (left > (mWidth - child.getWidth())) {//往右边滑动不可超过直播的宽度
return mWidth - child.getWidth();
} else {
return left;
}
/* final int leftBound = getPaddingLeft();
final int rightBound =mWidth - videoView.getWidth();
final int newLeft = Math.min(Math.max(left, leftBound), rightBound);
return newLeft;*/
}
@Override
public int clampViewPositionVertical(View child, int top, int dy) {
//撤销
if (top < 0) {
return 0;
} else if (top > (mHeight - child.getHeight())) {//往右边滑动不可超过直播的宽度
return mHeight - child.getHeight();
} else {
return top;
}
}
@Override
public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
// changedView.offsetTopAndBottom(-dy);//自己撤销回去？拉多少撤销多少 如果高度 不变的话 clampViewPositionVertical return top就可以了
}
/**
* 手指释放的时候回调
*/
@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
if (releasedChild == videoView) {
int mY = releasedChild.getTop();
if (releasedChild.getTop() < 0) {
mY = 0;
}
if (releasedChild.getBottom() > getHeight()) {
mY = getHeight() - releasedChild.getMeasuredHeight();
}
if (releasedChild.getRight() - releasedChild.getMeasuredWidth() / 2 > getWidth() / 2) {
initPointPosition.x = (int) (getWidth() - videoView.getWidth() * mPercent);
initPointPosition.y = mY;
mDragHelper.settleCapturedViewAt(initPointPosition.x, initPointPosition.y);
} else {
initPointPosition.x = (int) (0 - videoView.getWidth() * (1 - mPercent));
initPointPosition.y = mY;
mDragHelper.settleCapturedViewAt(initPointPosition.x, initPointPosition.y);
}
invalidate();
}
}
/**
* 不进行复写的话 没法拖动 直接被onInte return false;
* @param child
* @return
*/
@Override
public int getViewHorizontalDragRange(View child) {
return getMeasuredWidth() - child.getMeasuredWidth();
}
@Override
public int getViewVerticalDragRange(View child) {
return getMeasuredHeight() - child.getMeasuredHeight();
}
/* @Override
public int getViewVerticalDragRange(View child) {
return getMeasuredHeight() - child.getMeasuredHeight();
}*/
}
);
mDragHelper.setEdgeTrackingEnabled(ViewDragHelper.DIRECTION_ALL);
}
@Override
public void computeScroll() {
if (mDragHelper.continueSettling(true)) {
invalidate();
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
if(videoView!=null){
if (!isNotFirst) {
initPointPosition.x = videoView.getLeft();
initPointPosition.y = videoView.getTop();
Prt.d(TAG, "first position:x:" + initPointPosition.x + ",y:" + initPointPosition.y);
isNotFirst = true;
}
videoView.layout(initPointPosition.x, initPointPosition.y,
initPointPosition.x + videoView.getMeasuredWidth(),
initPointPosition.y + videoView.getMeasuredHeight());
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
final int action = MotionEventCompat.getActionMasked(event);
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
return false;
}
return mDragHelper.shouldInterceptTouchEvent(event);
// return mDragHelper.shouldInterceptTouchEvent(event);
/* if (mDragHelper.shouldInterceptTouchEvent(event)) {
return true;
} else {
return super.onInterceptTouchEvent(event);
}*/
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
// mDragHelper.cancel();
return false;
}
mDragHelper.processTouchEvent(event);
return true;
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
videoView = getChildAt(0);
post(new Runnable() {
@Override
public void run() {
mWidth = getWidth();
mHeight = getHeight();
}
});
}
}