Prevent drag drop of custom mimetype to EditText

Question

I have a custom mime type which I am intending to use to drag and drop application objects within the app. This seems to be working but I\'m finding that the EditText fields ar

Answer 1

I encountered the same behaviour. I have found the reason, which is located in TextView class.

The method onDragEvent(DragEvent event) is overrriden here and looks as below.

@Override
public boolean onDragEvent(DragEvent event) {
    switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            return mEditor != null && mEditor.hasInsertionController();

        case DragEvent.ACTION_DRAG_ENTERED:
            TextView.this.requestFocus();
            return true;

        case DragEvent.ACTION_DRAG_LOCATION:
            final int offset = getOffsetForPosition(event.getX(), event.getY());
            Selection.setSelection((Spannable)mText, offset);
            return true;

        case DragEvent.ACTION_DROP:
            if (mEditor != null) mEditor.onDrop(event);
            return true;

        case DragEvent.ACTION_DRAG_ENDED:
        case DragEvent.ACTION_DRAG_EXITED:
        default:
            return true;
    }
}

If it is possible to insert text => EditText then any drag will be processed and accepted there. The View class is not using OnDragListener, so it is not possible to prevent this behaviour by

editText.setOnDragListener(null);

The solution here is to subclass the EditText as here and override onDragEvent() method:

 public class YourEditText extends EditText {

 ...
 // other stuff
 ...

 @Override
 public boolean onDragEvent(DragEvent event) {
    switch (event.getAction()) {
       case DragEvent.ACTION_DRAG_STARTED:
           if (event.getClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) {
               return true;
           }
           return false;
       default:
           return super.onDragEvent(event);
    }
}

}

Now YourEditText will accept only drags with MIMETYPE_TEXT_PLAIN. If you want to disable the drag drop at all just return false in this method`

@Override
public boolean onDragEvent(DragEvent event) {
    return false;    
}

And that's it. Hope it will help.