以下是我的布局,在运行时工具栏根本不可见,选项卡视图中的两个选项卡占据了整个屏幕。在AndroidStudio的预览中,我确实看到了ActionBar,就像我期望的那样在顶部。我错过了什么?
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/c">
<android.support.v7.widget.Toolbar
android:id="@+id/my_toolbar2"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:background="?attr/colorPrimary"
android:layout_marginBottom="10dp"
app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto" />
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/c2">
<android.support.design.widget.TabLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:id="@+id/tabs"
app:layout_scrollFlags="scroll|enterAlways"/>
</RelativeLayout>
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
这是我正在使用的布局的活动:
public class TabletGallery extends AppCompatActivity implements ActionBar.TabListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); //To change body of overridden methods use File | Settings | File Templates.
setContentView(R.layout.tablet_gallery);
// Initilization
toolbar = (Toolbar) findViewById(R.id.my_toolbar2);
setSupportActionBar(toolbar);
viewPager = (ViewPager) findViewById(R.id.pager);
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
android:layout_height="wrap_content"
。 - hungryghost