Android隐藏操作栏

我试图隐藏我的操作栏。请检查我的代码。它似乎没有工作。我还列出了我的代码底部的LOGCAT。请帮忙。Android隐藏操作栏

MainActivity.java

public class MainActivity extends SherlockFragmentActivity { 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      requestWindowFeature(Window.FEATURE_NO_TITLE); 
      super.onCreate(savedInstanceState); 

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

      actionBar.setDisplayShowTitleEnabled(true); 

      Tab tab = actionBar.newTab() 
           .setText("Android") 
           .setTabListener(new AndroidFragment()) 
           .setIcon(R.drawable.android); 

      actionBar.addTab(tab); 

      tab = actionBar.newTab() 
        .setText("Apple") 
        .setTabListener(new AppleFragment()) 
        .setIcon(R.drawable.apple); 

      actionBar.addTab(tab); 


     } 

    }

的logcat：

10-06 18:17:25.781: E/AndroidRuntime(15962): FATAL EXCEPTION: main 
10-06 18:17:25.781: E/AndroidRuntime(15962): java.lang.RuntimeException: Unable to start activity ComponentInfo{in.wptrafficanalyzer.actionbarsherlocknavtab/in.wptrafficanalyzer.actionbarsherlocknavtab.MainActivity}: java.lang.NullPointerException 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.app.ActivityThread.access$600(ActivityThread.java:127) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.os.Looper.loop(Looper.java:137) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.app.ActivityThread.main(ActivityThread.java:4512) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at java.lang.reflect.Method.invokeNative(Native Method) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at java.lang.reflect.Method.invoke(Method.java:511) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at dalvik.system.NativeStart.main(Native Method) 
10-06 18:17:25.781: E/AndroidRuntime(15962): Caused by: java.lang.NullPointerException 
10-06 18:17:25.781: E/AndroidRuntime(15962): at in.wptrafficanalyzer.actionbarsherlocknavtab.MainActivity.onCreate(MainActivity.java:19) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.app.Activity.performCreate(Activity.java:4465) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052) 
10-06 18:17:25.781: E/AndroidRuntime(15962): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934) 
10-06 18:17:25.781: E/AndroidRuntime(15962): ... 11 more

来源

2012-10-06 KC Chai

如果您试图隐藏操作栏，为什么不只是调用actionBar.hide（）; ？ – Andrei

好吧，如果你使用的requestWindowFeature(Window.FEATURE_NO_TITLE);对象ActionBar你读三行后为空。因此，NPE。

但是，为什么你以这种方式隐藏ActionBar 和然后获取对象并设置标签和不可见的ActionBar？

另请参见安德烈对你的问题的评论。

来源

2012-10-06 22:18:41

Android隐藏操作栏

回答

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