I would like to ask about the
com.example.android.apis.app.FragmentRetainInstance.java in android api
demo 4.0.3, which demos how to use fragment to handle configuration changes
such as rotation.
At line 44-47
if (savedInstanceState == null) {
getFragmentManager().beginTransaction().add(android.R.id.content,
new UiFragment()).commit();
}
Why does it use android.R.id.content as the first argument at line 45?
The xml contains R.id.content is auto_complete_list.xml and the following
is the content:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android";
android:id="@+id/content"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:drawable/edit_text"
android:divider="@android:drawable/divider_horizontal_textfield"
android:addStatesFromChildren="true">
<LinearLayout android:id="@+id/container"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingRight="0dip"
/>
<AutoCompleteTextView android:id="@+id/edit"
android:completionThreshold="1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:layout_gravity="center_vertical"
/>
</LinearLayout>
There are two child under the root (R.id.content).
However, when the code runs, I do not see the AutoCompleteTextView but only
the layout inflate by UiFragment (R.layout.fragment_retain_instance).
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