Question

按照本教程，我在应用程序的操作栏中创建了一些选项卡。 https://www.youtube.com/watch?v=gMu8XhxUBl8 此应用程序只需在用户单击选项卡时更改布局。虽然没有编译错误，但我无法运行我的程序。它显示了消息，不幸停止了程序。但我在这里找不到错误。亲爱的。

这是我使用的代码，

public class TabsActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ActionBar bar = getActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    ActionBar.Tab TabA = bar.newTab().setText("Tab A");
    ActionBar.Tab TabB = bar.newTab().setText("Tab B");
    ActionBar.Tab TabC = bar.newTab().setText("Tab C");
    Log.d("action bar", "action bar");

    Fragment fragmentA = new AFragmentTab();
    Fragment fragmentB = new BFragmentTab();
    Fragment fragmentC = new CFragmentTab();
    Log.d("Fragments", "Fragments created");

    TabA.setTabListener(new MyTabsListener(fragmentA));
    TabB.setTabListener(new MyTabsListener(fragmentB));
    TabC.setTabListener(new MyTabsListener(fragmentC));
    Log.d("Tab listner", "Tab listner created");

    bar.addTab(TabA);
    bar.addTab(TabB);
    bar.addTab(TabC);
    Log.d("tabs added", "tabs added");


}

protected class MyTabsListener implements ActionBar.TabListener {


    private android.app.Fragment fragment;

    public MyTabsListener(Fragment fragment) {
        this.fragment = fragment;
        Log.d("my tab listner", "my tab listner");
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        Log.d("tab released", "tab released");
    }

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        ft.add(R.id.fragment_container, fragment, null);
        Log.d("ta selected", "tab selected");
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        // some people needed this line as well to make it work: 
        ft.remove(fragment);
        Log.d("tab unselected", "tab unselected");
    }
}

每个片段java文件编码都是这样的，

public class AFragmentTab extends android.app.Fragment {


public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
  {
    return inflater.inflate(R.layout.fragment_a, container, false);
  }

main.xml文件，

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/fragment_container"></LinearLayout>
</LinearLayout>

如何在操作栏中使用选项卡

0 个答案: