DrawerLayout下当用两个FrameLayout时setColorForDrawerLayout()函数会无效，无法变色

[chenjj2048]

用Fragment替换DrawerLayout下的content和drawer时，如果下面是FrameLayout就没办法换颜色，需替换成LinearLayout才能变色
像下面这样才行，如果是FrameLayout或RelativeLayout就会错乱

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawerLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white"
    android:fitsSystemWindows="true">

    <LinearLayout
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" />

    <LinearLayout
        android:id="@+id/drawer"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:orientation="vertical" />
</android.support.v4.widget.DrawerLayout>

下面函数只做了LinearLayout的判断，木有FrameLayout等的判断

public static void setColorForDrawerLayout(Activity activity, DrawerLayout drawerLayout, int color, int statusBarAlpha)
.....
// 内容布局不是 LinearLayout 时,设置padding top
        if (!(contentLayout instanceof LinearLayout) && contentLayout.getChildAt(1) != null) {
            contentLayout.getChildAt(1).setPadding(0, getStatusBarHeight(activity), 0, 0);
        }
.....