不幸的是，FTest已经停止了

Question

06-25 18:30:30.885: E/AndroidRuntime(26556): FATAL EXCEPTION: main 
06-25 18:30:30.885: E/AndroidRuntime(26556): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.eeee.ftest/com.eeee.ftest.MainActivity}: java.lang.NullPointerException 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.app.ActivityThread.access$700(ActivityThread.java:159) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.os.Handler.dispatchMessage(Handler.java:99) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.os.Looper.loop(Looper.java:176) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.app.ActivityThread.main(ActivityThread.java:5419) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at java.lang.reflect.Method.invokeNative(Native Method) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at java.lang.reflect.Method.invoke(Method.java:525) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at dalvik.system.NativeStart.main(Native Method) 
06-25 18:30:30.885: E/AndroidRuntime(26556): Caused by: java.lang.NullPointerException 
06-25 18:30:30.885: E/AndroidRuntime(26556): at com.eeee.ftest.MainActivity.onCreate(MainActivity.java:21) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.app.Activity.performCreate(Activity.java:5372) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104) 
06-25 18:30:30.885: E/AndroidRuntime(26556): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257) 
06-25 18:30:30.885: E/AndroidRuntime(26556): ... 11 more 


public class MainActivity extends SherlockFragmentActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.activity_main); 

     ActionBar actionbar = getSupportActionBar(); 
     actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 

     ActionBar.Tab Frag1 = actionbar.newTab().setText("Fragment 1"); 
     ActionBar.Tab Frag2 = actionbar.newTab().setText("Fragment 2"); 
     ActionBar.Tab Frag3 = actionbar.newTab().setText("Fragment 3"); 

     Fragment Fragment1 = new Fragment_1(); 
     Fragment Fragment2 = new Fragment_2(); 
     Fragment Fragment3 = new Fragment_3(); 

     Frag1.setTabListener(new MyTabsListener(Fragment1)); 
     Frag2.setTabListener(new MyTabsListener(Fragment2)); 
     Frag3.setTabListener(new MyTabsListener(Fragment3)); 

     actionbar.addTab(Frag1); 
     actionbar.addTab(Frag2); 
     actionbar.addTab(Frag3); 


    } 

    class MyTabsListener implements ActionBar.TabListener{ 

     public Fragment fragment; 

     public MyTabsListener(Fragment fragment){ 
      this.fragment = fragment; 
     } 

     @Override 
     public void onTabSelected(Tab tab, FragmentTransaction ft) { 
      // TODO Auto-generated method stub 
      ft.replace(R.id.fragment_container, fragment); 

     } 

     @Override 
     public void onTabUnselected(Tab tab, FragmentTransaction ft) { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void onTabReselected(Tab tab, FragmentTransaction ft) { 
      // TODO Auto-generated method stub 

     } 

    } 

} 

Answer 1

当使用ActionBarSherlock隐藏TitleBar时也意味着隐藏ActionBar。

所以删除requestWindowFeature（Window.FEATURE_NO_TITLE）;