無法從主要活動包含片段

-4

開始活動我想要使用片段，並在MainActivity中的方法中啓動一個活動。我的代碼MainActiviy.java是：無法從主要活動包含片段

protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

//  Setting up toolbar here 

     toolbar = (Toolbar) findViewById(R.id.app_bar); 
     toolbar.setLogo(R.mipmap.ic_launcher); 
     toolbar.setTitle(" Daily Qura'n Verses"); 
     setSupportActionBar(toolbar); 
//  add tabs in the mainactivity 

     super.onPostResume(); 
     mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost); 
     mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent); 

     mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Today's Verse"), 
       TodayVerse.class, null); 
     mTabHost.addTab(mTabHost.newTabSpec("tab2").setIndicator("Today's Chapter"), 
       TodayChapter.class, null); 
     mTabHost.addTab(mTabHost.newTabSpec("tab3").setIndicator("Complete Qur'an"), 
       completeQuran.class, null); 
//  set Alarm for notification creation 
     createNotification(); 


    }

和裏面的方法是：

public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case R.id.search_bar: 
       startActivity(new Intent(this, SearchResultsActivity.class)); 
      default: 
       return super.onOptionsItemSelected(item); 
     } 
    }

但是，當我點擊search_bar我收到錯誤。請幫我解決這個問題。

編輯1：

登錄貓：

8435-8435/com.example.shiza.dailyquranverses E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.shiza.dailyquranverses/com.example.shiza.dailyquranverses.SearchResultsActivity}: 
java.lang.NullPointerException 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
      at android.app.ActivityThread.access$600(ActivityThread.java:123) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
      at android.os.Handler.dispatchMessage(Handler.java:99) 
      at android.os.Looper.loop(Looper.java:137) 
      at android.app.ActivityThread.main(ActivityThread.java:4424) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:511) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.NullPointerException 
      at com.example.shiza.dailyquranverses.SearchResultsActivity.onCreate(SearchResultsActivity.java:24) 
      at android.app.Activity.performCreate(Activity.java:4492) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
            at android.app.ActivityThread.access$600(ActivityThread.java:123) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
            at android.os.Handler.dispatchMessage(Handler.java:99) 
            at android.os.Looper.loop(Looper.java:137) 
            at android.app.ActivityThread.main(ActivityThread.java:4424) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:511) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
            at dalvik.system.NativeStart.main(Native Method)

來源

2015-06-18 learner

貼錯誤logcat –

發佈你得到的錯誤 – MiloRambaldi

我正想要，我不得不殺死adb-server並重新啓動它。 – learner

com.example.shiza.dailyquranverses.SearchResultsActivity.onCreate(SearchResultsA‌ctivity.java 此行顯示有一些問題與您searchactivity值造成空指針異常，就請與你的價值觀

來源

2015-06-18 10:57:16 Madhu

無法從主要活動包含片段

回答

相關問題