<com.google.samples.apps.iosched.ui.widget.DrawShadowFrameLayout
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false"
app:shadowDrawable="@drawable/header_shadow">
<fragment android:name="com.google.samples.apps.iosched.settings.SettingsActivity$SettingsFragment"
android:id="@+id/settings_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<LinearLayout style="@style/HeaderBar"
android:id="@+id/headerbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true"
android:orientation="vertical">
<include layout="@layout/toolbar_actionbar" /> <!-- placeholder, empty except on L -->
</LinearLayout>
<!-- Butter bar -->
<FrameLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_marginTop="?actionBarSize">
<include layout="@layout/deprecated_include_butter_bar" />
</FrameLayout>
</com.google.samples.apps.iosched.ui.widget.DrawShadowFrameLayout>
<!-- Nav drawer -->
<include layout="@layout/navdrawer" />
</android.support.v4.widget.DrawerLayout>
com.google.samples.apps.iosched.settings.SettingsActivity $ SettingsFragment
$意味着??
settingsFragment是SettingsActivity中的静态内部类