View.getWidth()和View.getHeight()為0的根本原因是控件還沒有完成繪制，你必須等待系統將繪制完View時才能獲得。

@Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus){
            int width = this.getMeasuredWidth();
            int height = this.getMeasuredHeight();
        }
    }