Android 从MyApplication打开SQLite数据库-can'；无法在读/写模式下打开

我试图改变我的

数据库接口

实现，在

MyApplication extensed应用程序

中打开它，基本上从不关闭它（我做了一些研究，一位谷歌工程师推荐了它，请看链接问题）。我所做的修改非常小，但现在系统在打开数据库时抛出以下错误：

E/SQLiteDatabase(15690): android.database.sqlite.SQLiteException: not an error (code 0): Could not open the database in read/write mode.

这是相关代码

MyApplication.java

@Override
public void onCreate() {
    super.onCreate();
    try {
        DatabaseInterface.open();
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public class DatabaseInterface extends SQLiteOpenHelper {

    private final static String DB_PATH = Constants.DB_PATH;
    private final static String DB_NAME = Constants.DB_NAME;
    private static SQLiteDatabase mDatabase;
    private Context mContext;
    private static DatabaseInterface mInstance;

    private DatabaseInterface(Context context) {
        super(context, DB_NAME, null, 1);
        this.mContext = context;
    }

    public static DatabaseInterface getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new DatabaseInterface(context);
        }
        return mInstance;
    }

    public static void open() throws SQLException, IOException {
        //Open the database
        String path = DB_PATH + DB_NAME;
        mDatabase = SQLiteDatabase.openOrCreateDatabase(new File(path), null);
    }
}

DatabaseInterface.java

@Override
public void onCreate() {
    super.onCreate();
    try {
        DatabaseInterface.open();
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public class DatabaseInterface extends SQLiteOpenHelper {

    private final static String DB_PATH = Constants.DB_PATH;
    private final static String DB_NAME = Constants.DB_NAME;
    private static SQLiteDatabase mDatabase;
    private Context mContext;
    private static DatabaseInterface mInstance;

    private DatabaseInterface(Context context) {
        super(context, DB_NAME, null, 1);
        this.mContext = context;
    }

    public static DatabaseInterface getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new DatabaseInterface(context);
        }
        return mInstance;
    }

    public static void open() throws SQLException, IOException {
        //Open the database
        String path = DB_PATH + DB_NAME;
        mDatabase = SQLiteDatabase.openOrCreateDatabase(new File(path), null);
    }
}

---

好吧，这是因为我忘了添加

---

由于我的数据库位于手机的外部存储器中，因此我的

AndroidManifest.xml

。

好的，这是由于我忘记添加

当我的数据库驻留在手机的外部存储器中时，发送到我的

AndroidManifest.xml