Fragmente和上下文

Question

我有這樣的代碼放到一個片段但如果要求在片段語境下它不工作：

SimpleCursorAdapter ad1 = new SimpleCursorAdapter(**What i put here**, R.layout.spinner, cursor, from, to); 

如果這個代碼是爲活動這將是：

SimpleCursorAdapter(**This**, R.layout.spinner, cursor, from, to); 

請幫幫我。

Answer 1

您應該使用getActivity()訪問片段的活動背景：

SimpleCursorAdapter ad1 = new SimpleCursorAdapter(getActivity(), R.layout.spinner, cursor, from, to); 

我希望這有助於。

Answer 2

SQLiteDatabase db = getActivity().openOrCreateDatabase("IbsPEC.db", Context.MODE_PRIVATE, null); 
      Spinner ddlPrdutor1 = (Spinner)getActivity().findViewById(R.id.ddlProdutor1); 
      Cursor cursor = db.rawQuery("SELECT rowid _id,_grupo, id, nome FROM PRODUTOR ORDER BY NOME", null); 

      String[] from = { "nome", "_id", "_grupo" }; 
      int[] to = { R.id.lblNome, R.id.lblId, R.id.lbl_id_FK };    

     SimpleCursorAdapter ad1 = new SimpleCursorAdapter(getActivity(), R.layout.spinner, cursor, from, to); 
     ad1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 


      ddlPrdutor1.setAdapter(ad1); 
      db.close(); 

在調試模式下，錯誤在發生：ddProdutor1.setAdapter（AD1）; 僅返回異常NullPointer;這個班是一個片段。