拖放视图：即使在拖动到新位置后视图也会返回到原始位置

Question

我想在我的测试应用程序中向文本视图添加拖放功能 主布局包含一个 relativelayout(RL1) ，它又包含另一个 relativelayout(RL2) 现在 RL2 包含一个可以拖放到任何地方的文本视图

但是当我在 textview 上执行拖动时，它被拖动但我放下它，它返回到它的 originsl 位置 请帮帮我

我的主要活动

public class MainActivity extends Activity
{

TextView tv;
LayoutParams lParams;
RelativeLayout layout;
private static final String Tv_TAG =" TV_DRAG";
@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    tv = (TextView) findViewById(R.id.mainTextView1);
    tv.setTag(Tv_TAG);
    tv.setOnTouchListener(new MyTouchListener());

    layout = (RelativeLayout) findViewById(R.id. draggableRelativeLayout );
    layout.setOnDragListener(new MyDragListener());
}


private class MyTouchListener implements OnTouchListener
{

    @Override
    public boolean onTouch(View v, MotionEvent event)
    {
        ClipData.Item item = new ClipData.Item((CharSequence) v.getTag());
        String[] mimeTypes ={ClipDescription.MIMETYPE_TEXT_PLAIN};
        ClipData dragData = new ClipData(v.getTag().toString(), mimeTypes, item);

        View.DragShadowBuilder shdwbldr = new View.DragShadowBuilder(v);

        v.startDrag(dragData, shdwbldr, v, 0);
        v.setVisibility(View.INVISIBLE);
        return true;
    }


}

private class MyDragListener implements OnDragListener
{

    @Override
    public boolean onDrag(View v, DragEvent event)
    {

        View view = (View) event.getLocalState();

        switch (event.getAction()) { 
        case DragEvent.ACTION_DRAG_STARTED: 
            lParams =(RelativeLayout.LayoutParams)view.getLayoutParams(); 
            break;
            case DragEvent.ACTION_DRAG_ENTERED: 

                int x_cord = (int) event.getX();
                int y_cord = (int) event.getY();

                break; 
            case DragEvent.ACTION_DRAG_EXITED:

                x_cord = (int) event.getX();
                y_cord = (int) event.getY();
                lParams.leftMargin = x_cord;
                lParams.topMargin = y_cord;

                view.setLayoutParams(lParams);

                break;
            case DragEvent.ACTION_DROP: 
                    // Dropped, reassign View to ViewGroup 

                    ViewGroup owner = (ViewGroup) view.getParent(); 
                    owner.removeView(view);
                    RelativeLayout container = (RelativeLayout) v;
                    container.addView(view);
                    view.setVisibility(View.VISIBLE);
                    break; 
            case DragEvent.ACTION_DRAG_ENDED: 

                    break;
            default: break;

        }

        return true;
    }
}

}

**我的布局**

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:background="#AE9C9B"
android:id="@+id/ draggableRelativeLayout ">

<RelativeLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:background="@null"
    android:id="@+id/mainRelativeLayout1">

    <TextView
        android:layout_height="wrap_content"
        android:text="DRAG ME"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:layout_width="wrap_content"
        android:layout_margin="10dp"
        android:id="@+id/mainTextView1"/>

</RelativeLayout>

Answer 1

您需要为视图设置新坐标：

case DragEvent.ACTION_DROP:
    v.setX(event.getX());
    v.setY(event.getY());
    break;