Android下获取状态栏的高度

刚做一个东西，画图的时候 需要获取状态栏的高度，但是每次获取到的都是0，找了好多资料，终于找到了方法，代码如下：

/**
     * 
     * @param activity
     * @return > 0 success; <= 0 fail
     */
    public static int getStatusHeight(Activity activity){
        int statusHeight = 0;
        Rect localRect = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(localRect);
        statusHeight = localRect.top;
        if (0 == statusHeight){
            Class<?> localClass;
            try {
                localClass = Class.forName("com.android.internal.R$dimen");
                Object localObject = localClass.newInstance();
                int i5 = Integer.parseInt(localClass.getField("status_bar_height").get(localObject).toString());
                statusHeight = activity.getResources().getDimensionPixelSize(i5);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return statusHeight;
    }