ViewAnimator控制视图的隐藏与显示

xml代码

<ViewAnimator
android:id="@+id/sample_output"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1">

<ScrollView
style="@style/Widget.SampleMessageTile"
android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
style="@style/Widget.SampleMessage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="@dimen/horizontal_page_margin"
android:paddingRight="@dimen/horizontal_page_margin"
android:paddingTop="@dimen/vertical_page_margin"
android:paddingBottom="@dimen/vertical_page_margin"
android:text="@string/intro_message" />
</ScrollView>

<fragment
android:name="com.example.android.common.logger.LogFragment"
android:id="@+id/log_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</ViewAnimator>

Java代码

ViewAnimator output = (ViewAnimator) findViewById(R.id.sample_output);
if (mShown) {
output.setDisplayedChild(1);
} else {
output.setDisplayedChild(0);
}