Question

我试图在我的Android应用程序上使用图像拖动。我的问题是，当我停止拖动图像时，永远不会调用DragEvent.ACTION_DROP。

在我的日志猫中，我接到了这个电话：

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

感谢您的帮助。

这是我的代码：

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);

    }

}

我的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>

enter image description here

Answer 1

你必须有一些东西可以放下那个图像。到目前为止，您只在图像上有一个OnDragListener。您要删除该图像的位置不包含任何使用OnDragListener的控件，因此不会调用您的侦听器。

监听OnDragListeners的控件不能被隐藏或消失，所以你必须在那里放置一些网格，其中单元格看起来是空的但不是。例如，具有透明图像的ImageView。或者将Alpha设置为0f。

至少将OnDragListener设置为内部LinearLayout，然后您将获得Drop事件。

DragEvent.ACTION_DROP永远不会被调用

1 个答案: