遊標未封閉的方向變化

Question

嚴格的模式，運行時，當手機變革的方向，我的應用程序將與錯誤

資源在連接的堆棧跟蹤獲取，但從來沒有公佈過崩潰。 有關避免資源泄漏的信息，請參閱java.io.Closeable。 java.lang.Throwable中：顯式的終止方法「關閉」不叫

奇怪的是，如果我以調試模式運行應用程序，並把斷點在所有cursor.close（）只是爲了確保它實際上是命中，所有的斷點都會被擊中，應用程序永遠不會崩潰。

這是我的片段，它調用另一個包含所有SqlBrite查詢和遊標的類（爲簡潔起見，代碼已縮短）。

public class MenuSummary extends Fragment{ 

private DbHelper dbHelper; 
private Observable<?> income1, income2; 
private Observable imin; 
private Subscription s; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    dbHelper = new DbHelper(getContext()); 
} 

@Override 
public void onPause(){ 
    super.onPause(); 
    s.unsubscribe(); 
} 

@Override 
public void onResume(){ 
    super.onResume(); 
    displaySummary(selectedYear,selectedMonth); 
} 

@Override 
public void onStop() { 
    super.onStop(); 
} 

@Override 
public void onActivityCreated(Bundle savedInstanceState){ 
    super.onActivityCreated(savedInstanceState); 
} 

private void displaySummary(final int selectedYear, final int selectedMonth){ 

    income1 = dbHelper.getIncome(selectedYear,selectedMonth,1); 
    income2 = dbHelper.getIncome(selectedYear,selectedMonth,2); 

    List<Observable<?>> myObservables = Arrays.asList(income1,income2); 
    imin = Observable.combineLatest(myObservables, new FuncN<List<BigDecimal>>() { 
     @Override 
     public List<BigDecimal> call(Object... args) { 
      List<BigDecimal> listIncome = new ArrayList<~>(); 
      listIncome.add((BigDecimal) args[0]); 
      listIncome.add((BigDecimal) args[1]); 
      return listIncome ; 
     } 
    } 
).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()); 
s = imin.subscribe(new Action1<List<BigDecimal>>() { 
@Override 
public void call(List<BigDecimal> expensesAndBalance) { 
    //do plenty of view.settext here 
}}); 
} 

這裏是如何，包含了函數getIncome看起來像DbHelper類：

任何人都可以找出哪裏我錯在哪裏？

public class DbHelper { 

     private MySQLiteHelper mySQLiteHelper; 
     SqlBrite sqlBrite = new SqlBrite.Builder().build(); 
     BriteDatabase briteDb; 
     Subscription subscription; 

     private static DbHelper instance; 
     public DbHelper(Context context) { 
      mySQLiteHelper = new MySQLiteHelper(context); 
      sqlBrite = new SqlBrite.Builder().build(); 
      briteDb = sqlBrite.wrapDatabaseHelper(mySQLiteHelper,Schedulers.io()); 
     } 

     public Observable<BigDecimal> getIncome(final int endYear, final int endMonth, final int moneyJar){ 
     final String[] args = new String[]{moneyJar + "", endYear + "", endMonth + "", endYear + "", }; 
     Observable<BigDecimal> myObservable; 
     myObservable = briteDb.createQuery(MySQLiteHelper.TABLE_INCOME, "SELECT total FROM " + MySQLiteHelper.TABLE_INCOME + 
       " WHERE moneyJar = ? AND ((year = ? AND month <= ?) OR (year < ?)) and isDeleted = 0", args) 
       .map(new Func1<SqlBrite.Query, BigDecimal>() { 
        @Override 
        public BigDecimal call(SqlBrite.Query query) { 
         Cursor cursor = query.run(); 
         BigDecimal income, incomeTotal = new BigDecimal(0); 
         if (cursor != null) { 
          try { 
           if (cursor.getCount() > 0 && cursor.moveToFirst()) { 
            do { 
             income = new BigDecimal(cursor.getString(cursor.getColumnIndex("total"))); 
             incomeTotal = incomeTotal.add(income); 
            } while (cursor.moveToNext()); 
           } 
          } catch (Exception e) { 
           e.printStackTrace(); 
          } finally { 
           cursor.close(); 
          } 
         } 
         return incomeTotal; 
        } 
       }); 
     return myObservable; 
    } 
} 

Answer 1

您沒有關閉您的BriteDatabase實例。從docs

briteDb.close(); 

：

你應該當被關閉您的片段執行此

關閉底層SQLiteOpenHelper和刪除緩存的讀取和寫入數據庫。這並不妨礙現有的觀察對象保留現有引用，並且不會嘗試爲新訂閱創建新引用。