我正在使用 this tutorial将数据库导入我的应用程序。

它在 API 10 上运行良好，

但在 API 17 上它会抛出以下错误:

05-19 14:52:46.492: E/SQLiteLog(1893): (14) cannot open file at line 30176 of [00bb9c9ce4]
05-19 14:52:46.492: E/SQLiteLog(1893): (14) os_unix.c:30176: (2) open(/data/data/com.example.koday/databases/dizionario7.sqlite) - 
05-19 14:52:46.492: E/SQLiteDatabase(1893): Failed to open database '/data/data/com.example.koday/databases/dizionario7.sqlite'.
05-19 14:52:46.492: E/SQLiteDatabase(1893): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at com.example.koday.DataBaseHelper.checkDataBase(DataBaseHelper.java:82)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at com.example.koday.DataBaseHelper.createDataBase(DataBaseHelper.java:45)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at com.example.koday.MainActivity.frontquiz(MainActivity.java:70)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at com.example.koday.MainActivity.onCreate(MainActivity.java:64)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.app.Activity.performCreate(Activity.java:5104)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.os.Looper.loop(Looper.java:137)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at android.app.ActivityThread.main(ActivityThread.java:5039)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at java.lang.reflect.Method.invokeNative(Native Method)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at java.lang.reflect.Method.invoke(Method.java:511)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-19 14:52:46.492: E/SQLiteDatabase(1893):     at dalvik.system.NativeStart.main(Native Method)
05-19 14:52:47.683: E/(1893): database aperto
05-19 14:52:47.683: E/SQLiteLog(1893): (1) no such table: dati

这是我的代码:

public class DataBaseHelper extends SQLiteOpenHelper {

// The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.example.koday/databases/";

private static String DB_NAME = "dizionario7.sqlite";

private SQLiteDatabase myDataBase;

private final Context myContext;

/**
 * Constructor Takes and keeps a reference of the passed context in order to
 * access to the application assets and resources.
 * 
 * @param context
 */
public DataBaseHelper(Context context) {

    super(context, DB_NAME, null, 1);
    this.myContext = context;
}

/**
 * Creates a empty database on the system and rewrites it with your own
 * database.
 * */
public void createDataBase() throws IOException {

    boolean dbExist = checkDataBase();

    if (dbExist) {
        // do nothing - database already exist
    } else {

        // By calling this method and empty database will be created into
        // the default system path
        // of your application so we are gonna be able to overwrite that
        // database with our database.
        this.getReadableDatabase();

        try {

            copyDataBase();

        } catch (IOException e) {

            throw new Error("Error copying database");

        }
    }

}

/**
 * Check if the database already exist to avoid re-copying the file each
 * time you open the application.
 * 
 * @return true if it exists, false if it doesn't
 */
private boolean checkDataBase() {

    SQLiteDatabase checkDB = null;

    try {
        String myPath = DB_PATH + DB_NAME;
        checkDB = SQLiteDatabase.openDatabase(myPath, null,
                SQLiteDatabase.OPEN_READONLY);

    } catch (SQLiteException e) {

        // database does't exist yet.

    }

    if (checkDB != null) {

        checkDB.close();

    }

    return checkDB != null ? true : false;
}

/**
 * Copies your database from your local assets-folder to the just created
 * empty database in the system folder, from where it can be accessed and
 * handled. This is done by transfering bytestream.
 * */
private void copyDataBase() throws IOException {

    // Open your local db as the input stream
    InputStream myInput = myContext.getAssets().open(DB_NAME);

    // Path to the just created empty db
    String outFileName = DB_PATH + DB_NAME;

    // Open the empty db as the output stream
    OutputStream myOutput = new FileOutputStream(outFileName);

    // transfer bytes from the inputfile to the outputfile
    byte[] buffer = new byte[1024];
    int length;
    while ((length = myInput.read(buffer)) > 0) {
        myOutput.write(buffer, 0, length);
    }

    // Close the streams
    myOutput.flush();
    myOutput.close();
    myInput.close();

}

public void openDataBase() throws SQLException {

    // Open the database
    String myPath = DB_PATH + DB_NAME;
    myDataBase = SQLiteDatabase.openDatabase(myPath, null,
            SQLiteDatabase.OPEN_READONLY);

}

@Override
public synchronized void close() {

    if (myDataBase != null)
        myDataBase.close();

    super.close();

}

@Override
public void onCreate(SQLiteDatabase db) {

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}

// Add your public helper methods to access and get content from the
// database.
// You could return cursors by doing "return myDataBase.query(....)" so it'd
// be easy
// to you to create adapters for your views.

// Getting single contact
String getkword(String word) {
    SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.query("data",
            new String[] { "_id", "english", "korean" }, "english" + "=?",
            new String[] { word }, null, null, null, null);
    if (cursor != null)
        cursor.moveToFirst();

    String kword = cursor.getString(2);
    // return contact
    db.close();
    return kword;

}

// Getting All Contacts
public Cursor getCursor() {
    // Select All Query
    String selectQuery = "SELECT  * FROM " + "data";

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list

    return cursor;
}

}

编辑编辑编辑编辑 我在 list 中设置了权限:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

感谢您的帮助!

最佳答案

我认为问题在于不同版本 SDK 的数据库位置。请试试这个

private static String DB_PATH = "";
public DataBaseHelper(Context context) {
    super(context, DB_NAME, null, 1);// 1? its Database Version
    if(android.os.Build.VERSION.SDK_INT >= 4.2){
        DB_PATH = context.getApplicationInfo().dataDir + "/databases/";         
    } else {
       DB_PATH = "/data/data/" + context.getPackageName() + "/databases/";
    }
    this.mContext = context; 
}  

检查一下

How to use an existing database with an Android application

关于android - E/SQLiteLog(1893) : (14) cannot open file at line 30176 of [00bb9c9ce4]，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16636017/