android.database.sqlite.SQLiteCantOpenDatabaseException：未知错误（代码14）：无法打开数据库故障

Question

我想修复一个不允许我打开数据库的错误。可能通过所有的合并，出现了问题，但我似乎无法找到它。这是我的Log Cat报告。

E/SQLiteLog(894): (14) cannot open file at line 30191 of [00bb9c9ce4] 
E/SQLiteLog(894): (14) os_unix.c:30191: (2) open(/data/data/com.packagename/databases/MainDB) - 
Failed to open database '/data/data/com.packagename/databases/MainDB'. 
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database 
    at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method) 
    at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209) 
    at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193) 
    at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463) 
    at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185) 
    at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177) 
    at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804) 
    at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789) 
    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694) 
    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669) 
    at com.packagename.database.DBAdapter$DatabaseHelper.checkDataBase(DBAdapter.java:757) 
    at com.packagename.database.DBAdapter$DatabaseHelper.createDataBase(DBAdapter.java:734) 
    at com.packagename.database.DBAdapter.resetAllData(DBAdapter.java:490) 
    at com.packagename.OptionActivity$4.onClick(OptionActivity.java:157) 
    at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:136) 
    at android.app.ActivityThread.main(ActivityThread.java:5017) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
    at dalvik.system.NativeStart.main(Native Method) 

这里是可见的（或相关的）代码的片段回到日志。

选项活动

public void onClick_ResetAll(final View v) { 
    .... 
    .... 
    @Override 
    public void onClick(DialogInterface dialog, int which) { 
     TrackUtils.sendClickTrack(OptionActivity.this, "ui_action", "button_press", "Resetall_yes"); 
     final DBAdapter dba = new DBAdapter(v.getContext()); 
     dba.open(); 
     dba.resetAllData(v.getContext()); 
     dba.close(); 

    } 
    .... 
    ....  
} 

将对DBAdapter类

private DatabaseHelper mDbHelper; 
private static SQLiteDatabase mDb; 
@SuppressLint("SdCardPath") 
private static String DB_PATH; 
private static final String DATABASE_NAME = "MainDB"; 
private static final int DATABASE_VERSION = 3; 
private final Context adapterContext; 

public DBAdapter(Context context) { 
    this.adapterContext = context; 
    DB_PATH = adapterContext.getFilesDir().getAbsolutePath().replace("files", "databases") 
      + File.separator; 
} 

public DBAdapter open() throws SQLException { 
    mDbHelper = new DatabaseHelper(adapterContext); 

    try { 
     mDbHelper.createDataBase(); 
    } catch (IOException ioe) { 
     throw new Error("Unable to create database"); 
    } 

    try { 
     mDbHelper.openDataBase(); 
    } catch (SQLException sqle) { 
     throw sqle; 
    } 
    return this; 
} 

public void resetAllData(Context context) { 
    context.deleteDatabase("MainDB"); 
    mDbHelper = new DatabaseHelper(adapterContext); 

    try { 
     mDbHelper.createDataBase(); 
    } catch (IOException ioe) { 
     throw new Error("Unable to create database"); 
    } 

    try { 
     mDbHelper.openDataBase(); 
    } catch (SQLException sqle) { 
     throw sqle; 
    } 
} 

DatabaseHelper（延伸SQLiteOpenHelper）

DatabaseHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     helperContext = context; 
    } 

    public void createDataBase() throws IOException { 
     boolean dbExist = checkDataBase(); 
     if (dbExist) { 
     } else { 
      this.getReadableDatabase(); 
      try { 
       copyDataBase(); 
      } catch (IOException e) { 
       throw new Error("Error copying database"); 
      } 
     } 
    } 

    private boolean checkDataBase() { 
     SQLiteDatabase checkDB = null; 
     try { 
      String myPath = DB_PATH + DATABASE_NAME; 
      checkDB = SQLiteDatabase.openDatabase(myPath, null, 
        SQLiteDatabase.OPEN_READONLY); // This is where the error apparently occurs 
     } catch (SQLiteException e) { 
     } 
     if (checkDB != null) { 
      checkDB.close(); 
     } 
     return checkDB != null ? true : false; 
    } 

我已经在本网站上搜索解决方案，但无济于事。

Answer 1

您在可能不存在的文件路径上使用SQLiteDatabase.openDatabase。添加下面两行之前SQLiteDatabase.openDatabase呼叫

File file = new File(myPath);  
if (file.exists() && !file.isDirectory())