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< blockWidth && dY >

BlockSize & & dY

< (bottom - top)) { isBlockArea = true; } return true; case MotionEvent.ACTION_MOVE: if (isBlockArea) { mX = (int) event.getX() - dX; //设置范围 if ((blockWidth + blockSize + mX) < parentWidth && (blockSize + mX) >

= blockSize) {/ / calculate offset invalidate (); startX = (int) event.getX ()-blockWidth / 2 } else if ((blockSize + mX) > = blockSize) {/ / over reset mX = (int) parentWidth-blockWidth-blockSize; invalidate ();} isMove = true;} return true Case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: isBlockArea = false; isFinish = mRight = = parentWidth-blockSize; if (isFinish) {/ / listen callback if (finishListener! = null) {finishListener.finish () }} if (! isFinish & & isMove) {reset (startX);} break;} return super.onTouchEvent (event) } / * release springback animation * / private void reset (int start) {ValueAnimator valueAnimator = ValueAnimator.ofInt (start, 0); valueAnimator.setDuration (500); valueAnimator.start (); valueAnimator.addUpdateListener (animation-> {mX = (int) animation.getAnimatedValue (); / / Refresh invalidate ();}) ValueAnimator.addListener (new AnimatorListenerAdapter () {@ Override public void onAnimationEnd (Animator animation) {isMove = false; isFinish = false; startX = 0;}});} / * get the measured size * / private int getMyWSize (int measureSpec) {int result Int specMode = MeasureSpec.getMode (measureSpec); int specSize = MeasureSpec.getSize (measureSpec); if (specMode = = MeasureSpec.EXACTLY) {result = specSize;// exact size, so give the resulting size to view} else if (specMode = = MeasureSpec.AT_MOST) {result = Math.min (getScreenWidth ()-20, specSize);} else {result = getScreenWidth ()-20 } return result;} / * get the measured size * / private int getMyHSize (int measureSpec) {int result; int specMode = MeasureSpec.getMode (measureSpec); int specSize = MeasureSpec.getSize (measureSpec); if (specMode = = MeasureSpec.EXACTLY) {result = specSize / / exact size, so give the resulting size to view} else if (specMode = = MeasureSpec.AT_MOST) {result = Math.min (DEFAULT_HEIGHT, specSize);} else {result = DEFAULT_HEIGHT-20;} return result } / * get screen width * / private int getScreenWidth () {WindowManager windowManager = (WindowManager) getContext () .getSystemService (Context.WINDOW_SERVICE); DisplayMetrics displayMetrics = new DisplayMetrics (); windowManager.getDefaultDisplay () .getMetrics (displayMetrics); return displayMetrics.widthPixels;} / * * API callback method * / public interface FinishListener {void finish () }}

Usage

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