视图的拖放：即使拖到新位置后视图也返回到原始位置

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是我把它放下 returns 回到它的原始位置 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;

视图的拖放：即使拖到新位置后视图也返回到原始位置

DRAG AND DROP OF A VIEW : view returning to original position even after dragging to new position

android

drag-and-drop

android-relativelayout