DragEvent.ACTION_DROP is never called

Question

I am trying to use image drag and drop in an android app. My problem is that DragEvent.ACTION_DROP is never called when I stop dragging the image.

In my log cat, I get this call:

01-30 13:50:25.003: I/ViewRootImpl(2198): Reporting drop result: false

Thanks for the help.

Here is my code:

public class buildImage extends Activity implements OnTouchListener, OnDragListener
{
    private LinearLayout slider;
    private RelativeLayout board;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        this.requestWindowFeature(Window.FEATURE_NO_TITLE);

        super.onCreate(savedInstanceState);
        setContentView(R.layout.build_image);

        //drawing = (SignatureViewModed) findViewById(R.id.myTest);
        slider = (LinearLayout) findViewById(R.id.imageSlider);
        board = (RelativeLayout) findViewById(R.id.borad);

        setImagesSlider();

    }

    public void setImagesSlider()
    {
        ImageView image = new ImageView(this);
        image.setLayoutParams(new LinearLayout.LayoutParams(100, 100));

        Drawable draw = getResources().getDrawable(R.drawable.images);

        image.setImageDrawable(draw);
        image.setOnDragListener(this);

        image.setOnTouchListener(this);

        slider.addView(image);

    }

    @Override
    public boolean onTouch(View view, MotionEvent event) {
        // TODO Auto-generated method stub

        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            ClipData data = ClipData.newPlainText("tests", "test");
            DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
            view.startDrag(data, shadowBuilder, view, 0);
            //view.setVisibility(View.INVISIBLE);
            return true;
          } else {
            return false;
          }
    }

    @Override
    public boolean onDrag(View v, DragEvent event) {
        // TODO Auto-generated method stub

        int action = event.getAction();
          switch (event.getAction()) {
          case DragEvent.ACTION_DRAG_STARTED:
          {
              Log.i("check6", "check6");
            // do nothing
            return true;
          }
          case DragEvent.ACTION_DRAG_ENTERED:
          {
              Log.i("check4", "check4");
            //v.setBackgroundDrawable(enterShape);
              return true;
          }
          case DragEvent.ACTION_DRAG_EXITED:
          {
           // v.setBackgroundDrawable(normalShape);
              Log.i("check3", "check3");
              return true;
          }
          case DragEvent.ACTION_DROP:
            // Dropped, reassign View to ViewGroup

              Log.i("check", "check");
              addNewImage(event);

              return true;
          case DragEvent.ACTION_DRAG_ENDED:
          {
              Log.i("check2", "check2");


             // addNewImage(event);

              return true;
          }
          default:
            break;
          }
          return true;
        }

    public void addNewImage(DragEvent event)
    {
        ImageView image = new ImageView(this);
        image.setLayoutParams(new LinearLayout.LayoutParams(100, 100));

        Drawable draw = getResources().getDrawable(R.drawable.images);

        image.setImageDrawable(draw);

        board.addView(image);

        float x = event.getX();
        float y = event.getY();

        image.setX(x);
        image.setY(y);

        Log.i("margin", "x " + x + " y " + y);

    }

}

My xml

   <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <RelativeLayout
            android:layout_width="fill_parent"
            android:id="@+id/borad"
            android:background="@android:color/darker_gray"
            android:layout_above="@+id/temp"
            android:layout_height="fill_parent" >
        </RelativeLayout>

        <ScrollView
            android:layout_width="fill_parent"
            android:id="@+id/temp"
            android:layout_alignParentBottom="true"
            android:layout_height="wrap_content" >

            <LinearLayout
                android:id="@+id/imageSlider"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal" >
            </LinearLayout>
        </ScrollView>

    </RelativeLayout>

Answer 1

You must have something to discard this image. For now, you only have OnDragListener in the image itself. The point where you want to delete this image does not contain any control with OnDragListener, so your listener will not be called.

, OnDragListeners, , - , , . , ImageView . Alpha, 0f.

, OnDragListener LinearLayout, Drop.