Question

我正在测试我的应用中的拖放功能我有相对布局，包含两个文本视图这两个文本视图可以从初始位置拖放到布局中的任何位置

当我拖动文本视图时，它们可以被拖动到屏幕上的任何位置，但如果我将视图放在任何地方，它们都不再可见

我在文本视图上使用了OnTouchListener（）和OnDragListener（）

帮我解决这个问题

我的活动

public class MainActivity extends Activity
 {
private TextView tv1, tv2;
LayoutParams lParams;
private static final String msg = "DRAG EVENT TESTING";


@Override
protected void onCreate(Bundle savedInstanceState)
{
    // TODO: Implement this method
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    tv1 = (TextView) findViewById(R.id.bigTV);
    tv2 = (TextView) findViewById(R.id.smallTv);

    tv1.setOnTouchListener(new MyTouchListener());
    tv2.setOnTouchListener(new MyTouchListener());

    tv1.setOnDragListener(new MyDragListener());
    tv2.setOnDragListener(new MyDragListener());

}

private class MyTouchListener implements OnTouchListener
{

    @Override
    public boolean onTouch(View v, MotionEvent event)
    {


        ClipData dragData = ClipData.newPlainText("","");

        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)
    {
        switch(event.getAction()){
            case DragEvent.ACTION_DRAG_STARTED:
                lParams = (RelativeLayout.LayoutParams)v.getLayoutParams();
                Log.d(msg, "Action is DragEvent.ACTION_DRAG_STARTED");


                break;

            case DragEvent.ACTION_DRAG_ENTERED:
                Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENTERED");
                int x_cord = (int) event.getX();
                int y_cord = (int) event.getY();
                break;

            case DragEvent.ACTION_DRAG_EXITED :
                Log.d(msg, "Action is DragEvent.ACTION_DRAG_EXITED");
                x_cord = (int) event.getX();
                y_cord = (int) event.getY();
                lParams.leftMargin = x_cord;
                lParams.topMargin = y_cord;
                v.setLayoutParams(lParams);
                break;

            case DragEvent.ACTION_DRAG_LOCATION  :
                Log.d(msg, "Action is DragEvent.ACTION_DRAG_LOCATION");
                x_cord = (int) event.getX();
                y_cord = (int) event.getY();
                break;

            case DragEvent.ACTION_DROP:
                Log.d(msg, "ACTION_DROP event");


                break;
            case DragEvent.ACTION_DRAG_ENDED   :
                Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENDED");

                // Do nothing
                break;


            default: break; 
        }
        return true;
    }


}

      }

我的布局

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

<TextView
    android:id="@+id/bigTV"
    android:layout_height="wrap_content"
    android:text="Drag Me"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:layout_width="wrap_content"/>

<TextView
    android:id="@+id/smallTv"
    android:layout_height="wrap_content"
    android:text="Drag me too but slowly!"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:layout_width="wrap_content"
    android:layout_below="@id/bigTV"/>

      </RelativeLayout>

Answer 1

在ACTION_DROP事件的适当坐标处移动文本视图。

拖放完成后，拖放视图不可见

1 个答案: