限制动态添加的视图在相对布局中相互重叠

Question

我有一个包含按钮的relativelayout

此按钮可添加单击时拖放的文本视图

我的问题是如何防止这些文本在彼此拖放时相互重叠

动态添加和拖动textviews我说的看起来像this

我的主要活动

theme(
    strip.text.x = element_blank(),
    strip.background = element_blank())

我的clicklistener

public class MainActivity extends Activity 
{



RelativeLayout dropLayoutNew;

Button addText;

@Override
protected void onCreate(Bundle savedInstanceState)
{

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


    dropLayoutNew = (RelativeLayout) findViewById(R.id.edtxtlayout);    
    dropLayoutNew.setOnDragListener(new MyDragListener());
    addText = (Button) findViewById(R.id.mainButton1);
    addText.setOnClickListener(new MyButtonClickListener());





}

}

** MyLongClickListner **

public class MyButtonClickListener implements OnClickListener
 {

@Override
public void onClick(View v)
{
    ViewGroup relativeParent = (ViewGroup) v.getParent();
    CustomEdittext edttxt = new CustomEdittext(v.getContext());
    relativeParent.addView(edttxt);
    edttxt.setOnLongClickListener(new MyLongClickListener());

}

  }

我的拖拉机

public class MyLongClickListner implements OnLongClickListener
 {

@Override
public boolean onLongClick(View v)
{

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

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

    v.startDrag(dragdata, shdwbldr, v, 0);
    v.setVisibility(View.INVISIBLE);

    return true;
}

   }

myButtonClickListener

public class MyDragListener implements OnDragListener
 {

private LayoutParams params;

@Override
public boolean onDrag(View v, DragEvent event)
{
    View view = (View) event.getLocalState();


    switch(event.getAction())
    {
        case DragEvent.ACTION_DRAG_STARTED:

            params = (RelativeLayout.LayoutParams) view.getLayoutParams();  
            break;

        case DragEvent.ACTION_DRAG_ENTERED:
            int x = (int) event.getX();
            int y = (int) event.getY();

            break;

        case DragEvent.ACTION_DRAG_EXITED :

            break;

        case DragEvent.ACTION_DRAG_LOCATION  :
            x=  (int) event.getX();
            y =  (int) event.getY();
            break;

        case DragEvent.ACTION_DRAG_ENDED   :

            break;

        case DragEvent.ACTION_DROP:

            x = (int) event.getX();
            y = (int) event.getY();
            params.leftMargin = x;
            params.topMargin = y;

            view.setLayoutParams(params);
            view.setVisibility(View.VISIBLE);

            break;
        default: break;
    }
    return true;
}


 }

我的布局

public class MyButtonClickListener implements OnClickListener
{

@Override
public void onClick(View v)
{
    ViewGroup relativeParent = (ViewGroup) v.getParent();
      TextView txt = new TextView(v.getContext());
    relativeParent.addView(txt);
      txt.setText("Drag me");
    txt.setOnLongClickListener(new MyLongClickListner());

}

}