public class InfoTextView extends AutoRelativeLayout { private Context context; private int lastY; private int offY; private int MIN_HEIGHT = 600; public InfoTextView(Context context) {  super(context);  this.context = context;  init(); } public InfoTextView(Context context, AttributeSet attrs) {  super(context, attrs);  this.context = context;  init(); } public InfoTextView(Context context, AttributeSet attrs, int defStyle) {  super(context, attrs, defStyle);  this.context = context;  init(); } private void init() {  View root = inflate(context, R.layout.ad_detail_text_layout, this); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) {  return true; } @Override public boolean onTouchEvent(MotionEvent event) {  return true; } @Override public boolean dispatchTouchEvent(MotionEvent ev) {  boolean isConsume = false;  int y = (int) ev.getY();  switch (ev.getAction()) {  case MotionEvent.ACTION_DOWN:   isConsume = true;   lastY = y;   break;  case MotionEvent.ACTION_MOVE:   offY = y - lastY;   int[] screenSize = ScreenUtils.getScreenSize(context, false);   if (getTop() >= (screenSize[1] - MIN_HEIGHT)) {   break;   } //  Log.d("yzk", "y " + y + " getTop " + getTop() //   + " getBottom " + getBottom() //   + " screenSize[1] - getMeasuredHeight " + (screenSize[1] - getMeasuredHeight()) //   + " screenSize[1] - MIN_HEIGHT " + (screenSize[1] - MIN_HEIGHT));   if ((offY > 0 && getTop() < screenSize[1] - MIN_HEIGHT)    || offY < 0 && getTop() > screenSize[1] - getMeasuredHeight()) {   layout(getLeft(), getTop() + offY,    getRight(), getBottom() + offY);   }   break;  case MotionEvent.ACTION_UP:   break;  }  return isConsume || super.dispatchTouchEvent(ev); } }