Android custom sliding viewgroup up and down

Customize View to achieve an elastic sliding effect，for your reference，The specific content is as follows Implementation principle Measure all sub-Views in onMeasure() @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // Measure all child Views int count = getChildCount(); for (int i = 0; i <count; i++) { View childView = getChildAt(i); measureChild( childView, widthMeasureSpec, heightMeasureSpec); } setMeasuredDimension(widthMeasureSpec, heightMeasureSpec); } onLayout(), will All sub-Views are arranged in order of position @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { // Set the height of ViewGroup and arrange all child Views int childCount = getChildCount(); MarginLayoutParams params = ( MarginLayoutParams) getLayoutParams(); params.height = mScreenHeight * childCount; for (int i = 0; i <childCount; i+& #43;) { View childView = getChildAt(i); if (childView.getVisibility() != View.GONE) { // Place each ChildView at the specified position childView.layout(l, i * mScreenHeight, r, (i + 1) * mScreenHeight); } } } handle sliding in onTouchEvent() @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mLastY = ( int) event.getY(); mStart = getScrollY(); return true; case MotionEvent.ACTION_MOVE: if (!mScroller.isFinished()) { // Terminate sliding mScroller.abortAnimation(); } int offsetY = (int) (mLastY – event.getY()); Log.d(TAG, “onTouchEvent: getScrollY: ” + getScrollY()); Log.d(TAG, “onTouchEvent:…