SQLiteDatabase android IllegalStateException

Question

我有一個問題，當我使用Android的Sqlite。日誌告訴我，：

SQLiteConnectionPool(1730): **The connection pool for /data/data/dev.xx.xx/databases/XX has been closed but there are still 1 connections in use. They will be closed as they are released back to the pool.** 
08-02 14:15:41.490: D/AndroidRuntime(1730): Shutting down VM 
08-02 14:15:41.490: W/dalvikvm(1730): threadid=1: thread exiting with uncaught exception (group=0xb4d74908) 
08-02 14:15:41.510: E/AndroidRuntime(1730): FATAL EXCEPTION: main 
08-02 14:15:41.510: E/AndroidRuntime(1730): **java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase: /data/data/dev.xx.xx/databases/XX** 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:55) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at android.database.sqlite.SQLiteDatabase.endTransaction(SQLiteDatabase.java:520) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:263) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at dev.xx.xx.SettingActivity$3.onClick(SettingActivity.java:205) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at android.os.Handler.dispatchMessage(Handler.java:99) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at android.os.Looper.loop(Looper.java:137) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at android.app.ActivityThread.main(ActivityThread.java:5039) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at java.lang.reflect.Method.invoke(Method.java:511) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
08-02 14:15:41.510: E/AndroidRuntime(1730):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 

此錯誤來當我嘗試撥打：

public class DataBase extends SQLiteOpenHelper { 

... 
    void addUser(String who, String time, String table, String phone) { 
      SQLiteDatabase db = this.getWritableDatabase(); 
      ContentValues values = new ContentValues(); 
      values.put(KEY_NAME, who); 
      values.put(KEY_PHONE, phone); 
      values.put(KEY_TABLE_RES, table); 
      values.put(KEY_TIME, time); 
      db.insert(TABLE_RESERVATION, null, values); 
      db.close(); // Closing database connection 
     } 

.... 
} 

我的事情是當FUNC呼叫：

this.getWritableDatabase（）

Answer 1

我不相信你應該得到一個新的SQLiteDatabase實例 時間。您希望保留對SQLiteOpenHelper中的SQLiteDatabase對象的引用。你的SQLiteOpenHelper應該被構建得像下面這樣：

public class DataBase extends SQLiteOpenHelper { 

... 
    private SQLiteDatabase mDatabase; 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     ... 
     mDatabase = db; 
     ... 
    } 

    void addUser(String who, String time, String table, String phone) { 
     ContentValues values = new ContentValues(); 
     values.put(KEY_NAME, who); 
     values.put(KEY_PHONE, phone); 
     values.put(KEY_TABLE_RES, table); 
     values.put(KEY_TIME, time); 
     mDatabase.insert(TABLE_RESERVATION, null, values); 
    } 

.... 
}