addContentView用法

@Override    
    protected void onCreate(Bundle savedInstanceState) {     
        // TODO Auto-generated method stub     
        super.onCreate(savedInstanceState);     
    
        TextView tv = new TextView(this);     
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(     
        FrameLayout.LayoutParams.WRAP_CONTENT,     
        FrameLayout.LayoutParams.WRAP_CONTENT);     
        // 设置广告出现的位置(悬浮于顶部)     
        params.topMargin = 0;     
        params.gravity = Gravity.TOP | Gravity.CENTER_HORIZONTAL;     
    
        tv.setText("我擦擦擦...dynamic layout");     
        addContentView(tv, params);     
        // setContentView(tv);     
    }