操作欄啓動片段

如何從onOptionsItemsSelected啓動片段？操作欄啓動片段

@Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case R.id.action_support: 

       Fragment f = new SupportFragment(); 
          FragmentManager fragmentManager = getFragmentManager(); 
       fragmentManager.beginTransaction() 
         .replace(android.R.id.content, f).commit(); 



       Toast display = Toast.makeText(this, "Settings", 10); 
       display.show(); 
      case R.id.action_guide: 
       Toast display1 = Toast.makeText(this, "Guide", 10); 
       display1.show(); 
      return true; 
      default: 
      return super.onOptionsItemSelected(item); 
     } 
    } 

}

我試圖啓動支持片段。

感謝

來源

2014-02-25 user2229747

https://www.dropbox.com/s/4vnzxmypv6hggvh/error.txt – user2229747

顯示java.lang.NullPointerException 02-25 13:06 ：37.231：W/System.err（27967）：\t at openday.SupportFragment.onCreate（SupportFragment.java:18）查看SupportFragment.java類中的第18行有一個nullPointerException，或編輯您的帖子併發布整個代碼來獲得t他的問題解決了，但這似乎是另一個問題 –

謝謝，發現問題！ – user2229747

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    Fragment fragment; 
    switch (item.getItemId()) { 
      case R.id.action_support: 
       fragment = new Home(); 
      case 1: 
       fragment = new NotesList(); 
      default: 
       fragment = new defaultPageOrAnyOtheOption(); 
    } 

    FragmentManager fragmentManager = getFragmentManager(); 
    fragmentManager.beginTransaction() 
      .replace(R.id.content_frame, fragment).commit(); 
    return true; 

} // onOptionsItemSelected

來源

2014-02-25 11:36:15

嗨，感謝您的代碼，我已經更新了我原來的帖子與代碼和一個鏈接到logcat輸出，因爲它仍然崩潰的應用程序 – user2229747

試試吧

@Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case R.id.action_support: 

       //launch Support Fragment 
      // Fragment f = new SupportFragment(); 
      // replace(android.R.id.content, f); 

       Toast display = Toast.makeText(this, "Settings", 10); 
       display.show(); 
      return true; 
      case R.id.action_guide: 
       Toast display1 = Toast.makeText(this, "Guide", 10); 
       display1.show(); 
      return true; 
        } 
    }

來源

2014-02-25 11:29:32

它不起作用 – user2229747

可以發佈您的日誌貓.. –

日誌貓：https://www.dropbox.com/s/4vnzxmypv6hggvh/error.txt – user2229747

操作欄啓動片段

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