如何移动文本视图？

Question

我在框架布局中有textview和imageview,我想用手指在图像上移动文本.

<FrameLayout 
     android:id="@+id/framelayout"
     android:layout_marginTop="30dip"
     android:layout_height="fill_parent" 
     android:layout_width="fill_parent">

     <ImageView 
          android:id="@+id/ImageView01"
          android:layout_height="wrap_content" 
          android:layout_width="wrap_content"/>

    <TextView android:id="@+id/text_view"
          android:layout_marginTop="30dip"
          android:layout_width="wrap_content" 
          android:maxLines="20"
          android:scrollbars="vertical"
          android:layout_height="wrap_content"/>

</FrameLayout>

我尝试了一些代码,但它没有正常工作告诉我正确的方法.

    public boolean onTouch(View v, MotionEvent event) {

    float x1 = 0, x2, y1 = 0, y2;
    String direction;
    switch(event.getAction()) {
            case(MotionEvent.ACTION_DOWN):
                x1 = event.getX();
                y1 = event.getY();

                break;
            case(MotionEvent.ACTION_UP): {
                x2 = event.getX();
                y2 = event.getY();
                float dx = x2-x1;
                float dy = y2-y1;

                    // Use dx and dy to determine the direction
                if(Math.abs(dx) > Math.abs(dy)) {
                    if(dx>0) direction = "right";
                    else direction = "left";
                } else {
                    if(dy>0) direction = "down";
                    else direction = "up";
                }
            }

    }
    return false;
}

Answer 1

我通过使用此代码得到答案

    vg = (ViewGroup)findViewById(R.id.vg);
    vg.setOnTouchListener(new View.OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent event) {
       switch(event.getActionMasked())
          {
             case MotionEvent.ACTION_MOVE:
                 int x = (int)event.getX() - offset_x;
                 int y = (int)event.getY() - offset_y;
                 int w = getWindowManager().getDefaultDisplay().getWidth();
                 int h = getWindowManager().getDefaultDisplay().getHeight();
                 if(x > w)
                     x = w;
                 if(y > h)
                     y = h;
                 LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                                 new ViewGroup.MarginLayoutParams(
                                 LinearLayout.LayoutParams.FILL_PARENT,
                                 LinearLayout.LayoutParams.FILL_PARENT));
                 lp.setMargins(x, y, 0, 0);
                 selected_item.setLayoutParams(lp);
                 break;
             default:
                 break;
          }
       return true;
    }
 });
   tv = (TextView)findViewById(R.id.text_view2);
   tv.setOnTouchListener(new View.OnTouchListener() {

   @Override
   public boolean onTouch(View v, MotionEvent event) {
      switch(event.getActionMasked())
      {
        case MotionEvent.ACTION_DOWN:
             offset_x = (int)event.getX();
             offset_y = (int)event.getY();
             selected_item = v;
             break;
        default:
             break;
      }                               
      return false;
   }
   });
}