@Override
public boolean onTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
final int x = (int) ev.getX();
final int y = (int) ev.getY();
if (action == MotionEvent.ACTION_DOWN && x > (this.getWidth() - 60)) mDragMode = true;
if (!mDragMode) return super.onTouchEvent(ev);
switch (action) {
case MotionEvent.ACTION_DOWN:
mStartPosition = pointToPosition(x, y);
if (mStartPosition != INVALID_POSITION) {
mItemPosition = mStartPosition - getFirstVisiblePosition();
mDragPointOffset = y - getChildAt(mItemPosition).getTop();
mDragPointOffset -= ((int) ev.getRawY()) - y;
startDrag(mItemPosition, y);
drag(50, y);
} else mDragMode = false;
break;
case MotionEvent.ACTION_MOVE:
drag(50, y);
final int mCurrentPosition = pointToPosition(x, y);
if ((y < 100) && (mCurrentPosition >= 0)) {
this.smoothScrollToPosition(mCurrentPosition - 1);
mDragListener.onStopDrag(getChildAt(mItemPosition));
} else if (((y - getHeight()) < 100)
&& ((mCurrentPosition > 0) && (mCurrentPosition < this.getCount()))) {
this.smoothScrollToPosition(mCurrentPosition + 1);
mDragListener.onStopDrag(getChildAt(mItemPosition));
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
default:
mDragMode = false;
mEndPosition = pointToPosition(x, y);
stopDrag(mStartPosition - getFirstVisiblePosition());
if (mDropListener != null
&& mStartPosition != INVALID_POSITION
&& mEndPosition != INVALID_POSITION) mDropListener.onDrop(mStartPosition, mEndPosition);
break;
}
return true;
}
private void stopDrag(int itemIndex) {
if (mDragView != null) {
if (mDragListener != null) mDragListener.onStopDrag(getChildAt(itemIndex));
mDragView.setVisibility(GONE);
final WindowManager wm =
(WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
wm.removeView(mDragView);
mDragView.setImageDrawable(null);
mDragView = null;
}
}
private void drag(int x, int y) {
if (mDragView != null) {
final WindowManager.LayoutParams layoutParams =
(WindowManager.LayoutParams) mDragView.getLayoutParams();
layoutParams.x = x;
layoutParams.y = y - mDragPointOffset;
final WindowManager mWindowManager =
(WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
mWindowManager.updateViewLayout(mDragView, layoutParams);
if (mDragListener != null) mDragListener.onDrag(x, y, this);
}
}
private void startDrag(int itemIndex, int y) {
stopDrag(itemIndex);
final View item = getChildAt(itemIndex);
if (item == null) return;
item.setDrawingCacheEnabled(true);
if (mDragListener != null) mDragListener.onStartDrag(item);
final Bitmap bitmap = Bitmap.createBitmap(item.getDrawingCache());
final WindowManager.LayoutParams mWindowParams = new WindowManager.LayoutParams();
mWindowParams.gravity = Gravity.TOP;
mWindowParams.x = 0;
mWindowParams.y = y - mDragPointOffset;
mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowParams.flags =
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
| WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS;
mWindowParams.format = PixelFormat.TRANSLUCENT;
mWindowParams.windowAnimations = 0;
final Context context = getContext();
final ImageView v = new ImageView(context);
v.setImageBitmap(bitmap);
final WindowManager mWindowManager =
(WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
mWindowManager.addView(v, mWindowParams);
mDragView = v;
}
