imv3.setOnDragListener(new View.OnDragListener() {
@Override
    public boolean onDrag(View v, DragEvent event) {
        switch (event.getAction()) {
            case DragEvent.ACTION_DROP:
            Log.d(msg, "ACTION_DROP event " + event.getClipData().getItemAt(0).getText());
            int itemId = Integer.parseInt((String) event.getClipData().getItemAt(0).getText());
            if ((itemId == R.id.imA)) {
                correct.start();
                score++;
                Toast.makeText(getApplicationContext(), "ถูกต้อง", Toast.LENGTH_LONG).show();
                float gx = imv3.getX()imA.setY(gy);
                enable( false );
                selected=true;
                delay();
            };
                float gy = imv3.getY();
                imA.setX(gx);

            if (itemId == R.id.imE) {
                incorrect.start();
                Toast.makeText(getApplicationContext(), "ผิด", Toast.LENGTH_LONG).show();
                float gx = imv3.getX();
                float gy = imv3.getY();
                imE.setX(gx);
                imE.setY(gy);
                enable( false );
                selected=true;
                delay();
            }
            if ((itemId == R.id.imO)) {
                incorrect.start();
                Toast.makeText(getApplicationContext(), "ผิด", Toast.LENGTH_LONG).show();
                float gx = imv3.getX();
                float gy = imv3.getY();
                imO.setX(gx);
                imO.setY(gy);
                enable( false );
                selected=true;
                delay();
            }
            if ((itemId == R.id.imR)) {
                incorrect.start();
                Toast.makeText(getApplicationContext(), "ผิด", Toast.LENGTH_LONG).show();
                float gx = imv3.getX();
                float gy = imv3.getY();
                imR.setX(gx);
                imR.setY(gy);
                enable( false );
                selected=true;
                delay();
            }
            break;
            default:
        break;
        }
        return true;
    }
});