LayoutInflater空指針異常

Question

我想刷新我的自定義ListViewAdapter;

編輯：

當我ListView中單擊一個項目它調用GoruntuleActivity的屏幕和創建onCreate方法（我假設它正在創建..）然後我打電話GoruntuleActivity和的方法layputInflater進入這個Activity。

ListeleActivity.java

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View item, 
        int position, long id) { 

       onClickPosition = position; 

       final Intent intent = new Intent(ListeleActivity.this, 
         GoruntuleActivity.class); 
       startActivity(intent); 

       goruntuleNesnesi.isSetListRefresh(onClickPosition , issetlist); 
      } 
     }); 

並呼籲GoruntuleActivity.java

public void isSetListRefresh(int onClickPosition, ArrayList<String> issetlist) 
    { 
     issetlist.set(onClickPosition, "false"); 
     setRecentOrSeen(issetlist); 
     ListviewRefresh(); 
    } 

    public void ListviewRefresh() 
    { 
     LayoutInflater mLInflater = LayoutInflater.from(this); 

     ListViewAdapter adapter = new ListViewAdapter(
       getApplicationContext(), getKimdenList(), getKonuList(), getRecentOrSeen() , 
       mLInflater); 
     adapter.Remove(); 

    } 

的方法，而現在它給我另一個例外..

05-18 16:25:22.073: E/AndroidRuntime(807): FATAL EXCEPTION: main 
05-18 16:25:22.073: E/AndroidRuntime(807): java.lang.IllegalStateException: System services not available to Activities before onCreate() 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.app.Activity.getSystemService(Activity.java:3526) 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.view.LayoutInflater.from(LayoutInflater.java:171) 
05-18 16:25:22.073: E/AndroidRuntime(807): at com.mobil.eposta.GoruntuleActivity.ListviewRefresh(GoruntuleActivity.java:160) 
05-18 16:25:22.073: E/AndroidRuntime(807): at com.mobil.eposta.GoruntuleActivity.isSetListRefresh(GoruntuleActivity.java:155) 
05-18 16:25:22.073: E/AndroidRuntime(807): at com.mobil.eposta.ListeleActivity$1.onItemClick(ListeleActivity.java:137) 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.widget.AdapterView.performItemClick(AdapterView.java:284) 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.widget.ListView.performItemClick(ListView.java:3382) 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696) 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.os.Handler.handleCallback(Handler.java:587) 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.os.Handler.dispatchMessage(Handler.java:92) 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.os.Looper.loop(Looper.java:123) 
05-18 16:25:22.073: E/AndroidRuntime(807): at android.app.ActivityThread.main(ActivityThread.java:4627) 
05-18 16:25:22.073: E/AndroidRuntime(807): at java.lang.reflect.Method.invokeNative(Native Method) 
05-18 16:25:22.073: E/AndroidRuntime(807): at java.lang.reflect.Method.invoke(Method.java:521) 
05-18 16:25:22.073: E/AndroidRuntime(807): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
05-18 16:25:22.073: E/AndroidRuntime(807): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
05-18 16:25:22.073: E/AndroidRuntime(807): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

從錯誤日誌中，它看起來像getApplicationContext（）返回null。你什麼時候打電話goruntuleNesnesi.ListviewRefresh();？它在onCreate（...）中嗎？如果是這樣，那可能是你的問題，因爲getApplicationContext(...)將返回null，直到onCreate(...)完成初始化。

編輯：我查看了一下堆棧跟蹤，看起來好像你在點擊按鈕時調用ListviewRefresh。您是否嘗試過使用this而不是getApplicationContext（...）？

編輯2：試試這個：

ListViewAdapter adapter = new ListViewAdapter(this, getKimdenList(), getKonuList(), getRecentOrSeen() ,mLInflater); 

雖然，我認爲這可能從有同樣的問題，因爲該活動尚未在屏幕上繪製但並沒有被初始化，你不能誇大其意。試試看，我們會從那裏開始。