Fragment 的工具栏在 Activity 的工具栏上透明

Fragment's Toolbar transparent over Activity's toolbar

我有一个我似乎无法弄清楚的特殊情况,我有预感它涉及 CollapsingToolbarLayout

我有一个 activity 具有以下 XML 布局:

<android.support.design.widget.CoordinatorLayout>

    <android.support.design.widget.AppBarLayout>

        <android.support.design.widget.CollapsingToolbarLayout
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <ImageView
                app:layout_collapseMode="parallax"/>

            <android.support.v7.widget.Toolbar />

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

    <LinearLayout
        app:layout_behavior="@string/appbar_scrolling_view_behavior" >

        <android.support.design.widget.TabLayout />
        <!-- Two fragments inside ViewPager each containing a RecyclerView -->
        <android.support.v4.view.ViewPager />

    </LinearLayout>

    <!-- User Clicks a button and fragment is added to this framelayout -->
    <!-- This fragment overlays on top of the entire Activity layout -->
    <!-- This fragment also contains a recyclerview -->
    <FrameLayout/>


</android.support.design.widget.CoordinatorLayout>

Activity 的工具栏如下所示:

然后当我在 Activity 的布局之上打开一个 Fragment 时,会发生这种情况:

这是片段的 XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:elevation="4dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <android.support.v7.widget.Toolbar
        android:id="@+id/fragmentToolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minHeight="?attr/actionBarSize"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        />

    <android.support.v4.widget.SwipeRefreshLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.RecyclerView
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

这就是我初始化 Fragment 工具栏的方式:

private void initToolBar(View root) {
    Toolbar toolbar = (Toolbar) root.findViewById(R.id.fragmentToolbar);
    toolbar.setBackgroundColor(mColor);
    ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);
    ((AppCompatActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    ((AppCompatActivity) getActivity()).getSupportActionBar().setHomeButtonEnabled(true);
    ((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(mTitle);
}

为什么会出现这个问题?

正如 hitch.united 指出的那样,它就像检查 mColor 的值一样简单。浪费了那么多小时!希望这可以帮助其他人,如果他们曾经处于相同的位置!