关于Unity3d 调用Android jar 中的 悬浮框 没有显示的问题

Display display = activity.getWindowManager().getDefaultDisplay();
WindowManager mWM = (WindowManager) activity.getSystemService(activity.WINDOW_SERVICE);
ImageView ivCursor = new ImageView(activity);
try {
Drawable drawable = Drawable.createFromStream(activity.getAssets().open("tom.jpg"), "tom");
System.out.println("------->");
ivCursor.setImageDrawable(drawable);

        //ivCursor.setBackground(new BitmapDrawable(BitmapFactory.decodeStream(activity.getAssets().open("Tom.jpg"))));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }       
    WindowManager.LayoutParams mParams = new WindowManager.LayoutParams();// 对ivCursor对象的参数描述对象
    System.out.println("------->1");
    mParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
    mParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
    mParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;// 设置成不能获取焦点
    mParams.type = LayoutParams.TYPE_PHONE;
    // 设置图片格式，效果为背景透明
    mParams.format = PixelFormat.RGBA_8888;
    mParams.gravity = Gravity.TOP | Gravity.LEFT;
    mParams.x = 0;// 相对于屏幕原点的x轴距离
    mParams.y = 0;// 相对于屏幕原点的y轴距离
    System.out.println("------->0");
    mWM.addView(ivCursor, mParams);
    System.out.println("<-------");

    这是悬浮框的代码 activity是继承了UnityPlayerActivity 的activity 
    为什么 最后一句mWM.addView(ivCursor, mParams);没有执行啊 

    有没有大神 做过类似的啊 提点下 

http://blog.csdn.net/crazy1235/article/details/46733221