Question

我已阅读Failed to change locale for db '/data/data/my.easymedi.controller/databases/EasyMediInfo.db' to 'en_US'的解决方案，但它对我没有帮助。我仍然有同样的错误。

这是我的DBHelper课程。你能调查并帮助我吗？

package com.example.mgr;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Date;
import java.util.ArrayList;


import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;

public class DBHelper extends SQLiteOpenHelper{

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

    private static String DB_NAME = "Mgr.Test.db";

    private SQLiteDatabase myDataBase; 

    private final Context myContext;

    public static final String KEY_ROWID = "_id";

    public static final String KEY_DATE = "DataWstawiena";

    public static final String KEY_TRESC = "Tresc";

    public static final String DATABASE_NAME = "Mgr.Test";

    public static final String DATABASE_TABLE = "InformacjeZDziekanatu";
    private static int DATABASE_VERSION = 18;
    /**
     * Constructor
     * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
     * @param context
     */
    public DBHelper(Context context) {

        super(context, DB_NAME, null, DATABASE_VERSION);
        System.out.println("------Odpalam DBHelpera---wolane z konstruktora----");
        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();
        System.out.println("----Baza istnieje: " + dbExist + "-----");

        if(dbExist){
            System.out.println("----Baza istnieje!");
            this.getReadableDatabase();
            System.out.println("----Baza istnieje! znow");
            //do nothing - database already exist
        }
        dbExist = checkDataBase();
        if(!dbExist){
            System.out.println("----Baza nie istnieje");

            //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 {
                System.out.println("Bede kopiowal");
                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;
        System.out.println("----Baza istnieje w checkDB!");
        try{
            String myPath = DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS|SQLiteDatabase.OPEN_READONLY);
            System.out.println("Bazka otwarta!");

        }catch(SQLiteException e){

            System.out.println("database does't exist yet");

        }

        if(checkDB != null){
            System.out.println("Zamykam baze");

            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 SQLiteDatabase openDataBase() throws SQLException{

        String myPath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS|SQLiteDatabase.OPEN_READONLY);
        return myDataBase;
    }

    @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) {
        try {
            copyDataBase();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(" ----Jestem w mtodzie onUpgrade------");
        //DATABASE_VERSION++;

    }

    /**
    * Wykonuje zapytanie SQL
    * @param query - zapytanie SQL
    * @return zwraca Stringa z rezultatem
    */
    public String executeQuery(String query){
    String result = "";
    Cursor cursor = myDataBase.rawQuery(query, null);
    String dataWs ="Data Wstawienia ";
    String tresc = "Tresc";
    result = dataWs + tresc + "\n";
    if(cursor.moveToFirst())
    {
    do
    {
    result +=  cursor.getString(1) +" "+ cursor.getString(3)+"\n";
    }while(cursor.moveToNext());
    }

    return result;
    }

    /**
    * Wykonuje zapytanie SQL i zwraca tablice
    * @param query - zapytanie SQL
    * @return zwraca tablie Stringa z rezultatem
    */
    public ArrayList<String> executeQueryTab(String query){
    ArrayList<String> result = new ArrayList<String>();
    Cursor cursor = myDataBase.rawQuery(query, null);
    String dataWs ="Data Wstawienia ";
    String tresc = "Tresc";
    result.add(dataWs + tresc);
    if(cursor.moveToFirst())
    {
    do
    {
    result.add(cursor.getString(1) +" "+ cursor.getString(3));
    }while(cursor.moveToNext());
    }

    return result;
    }


        // 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.

}

之前它工作得很好但我已经对数据库进行了一些升级，然后停止了工作。我想这是这个错误的根源，但我不确定。

提前致谢！

根据您的要求：

我在 MainActivity 类中调用了createDataBase方法，如下所示：

package com.example.mgr;

import java.io.IOException;
import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

    SharedPreferences preferences;
    TextView tv;
    Adapter adapter;
    SQLiteDatabase as;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button infDlaStudButton = (Button) findViewById(R.id.infDlaStud);
        Button infDlaKandButton = (Button) findViewById(R.id.infDlaKand);
        preferences = PreferenceManager.getDefaultSharedPreferences(this);
        DBHelper myDbHelper = new DBHelper(this);
        infDlaStudButton.setOnClickListener(this);
        infDlaKandButton.setOnClickListener(this);

        infDlaKandButton.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                ble();

            }

        });

        infDlaStudButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                ble();
            }
        });

        try {
            myDbHelper.createDataBase();
            System.out.println("Stworzyłam bazę danych");

        } catch (IOException ioe) {

            throw new Error("nie moge to create database");

        }
        System.out.println("bede otwierdal baze danych w glowej metodzie");

        myDbHelper.openDataBase();

    }

    void ble() {
        Intent intent = new Intent();
        intent.setClass(MainActivity.this, SecondActivity.class);
        startActivity(intent);
    }

    @Override
    public void onClick(View arg0) {
        Toast.makeText(this, "ble", Toast.LENGTH_LONG).show();
        // TODO Auto-generated method stub

    }

}

是的， android_metadata 表存在于数据库中，并且具有' en_US '值。

我创建了一个非常简单的新数据库 Drzewo.db 。当此表只有2个表： andoid_metadata 和另一个表（ Przyjeci ）时，一切正常！但后来我添加了新表并试图进行升级，我也有同样的错误。

我的日志（来自这个新数据库）：

12-04 19:58:41.959: E/SQLiteLog(2293): (11) database corruption at line 50741 of [00bb9c9ce4]
12-04 19:58:41.959: E/SQLiteLog(2293): (11) database corruption at line 50780 of [00bb9c9ce4]
12-04 19:58:41.969: E/SQLiteLog(2293): (11) statement aborts at 16: [SELECT locale FROM android_metadata UNION SELECT NULL ORDER BY locale DESC LIMIT 1] 
12-04 19:58:42.056: E/SQLiteDatabase(2293): Failed to open database '/data/data/com.example.mgr/databases/Drzewo.db'.
12-04 19:58:42.056: E/SQLiteDatabase(2293): android.database.sqlite.SQLiteException: Failed to change locale for db '/data/data/com.example.mgr/databases/Drzewo.db' to 'en_US'.
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnection.setLocaleFromConfiguration(SQLiteConnection.java:386)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:218)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:854)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:229)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at com.example.mgr.DBHelper.createDataBase(DBHelper.java:53)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at com.example.mgr.MainActivity.onCreate(MainActivity.java:73)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.app.Activity.performCreate(Activity.java:5104)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.os.Looper.loop(Looper.java:137)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.app.ActivityThread.main(ActivityThread.java:5041)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at java.lang.reflect.Method.invokeNative(Native Method)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at java.lang.reflect.Method.invoke(Method.java:511)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at dalvik.system.NativeStart.main(Native Method)
12-04 19:58:42.056: E/SQLiteDatabase(2293): Caused by: android.database.sqlite.SQLiteDatabaseCorruptException: database disk image is malformed (code 11)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnection.nativeExecuteForString(Native Method)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnection.executeForString(SQLiteConnection.java:634)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     at android.database.sqlite.SQLiteConnection.setLocaleFromConfiguration(SQLiteConnection.java:367)
12-04 19:58:42.056: E/SQLiteDatabase(2293):     ... 28 more
12-04 19:58:42.219: E/SQLiteOpenHelper(2293): Couldn't open Drzewo.db for writing (will try read-only):
12-04 19:58:42.219: E/SQLiteOpenHelper(2293): android.database.sqlite.SQLiteException: Failed to change locale for db '/data/data/com.example.mgr/databases/Drzewo.db' to 'en_US'.
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnection.setLocaleFromConfiguration(SQLiteConnection.java:386)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:218)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:854)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:229)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at com.example.mgr.DBHelper.createDataBase(DBHelper.java:53)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at com.example.mgr.MainActivity.onCreate(MainActivity.java:73)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.app.Activity.performCreate(Activity.java:5104)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.os.Handler.dispatchMessage(Handler.java:99)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.os.Looper.loop(Looper.java:137)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.app.ActivityThread.main(ActivityThread.java:5041)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at java.lang.reflect.Method.invokeNative(Native Method)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at java.lang.reflect.Method.invoke(Method.java:511)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at dalvik.system.NativeStart.main(Native Method)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293): Caused by: android.database.sqlite.SQLiteDatabaseCorruptException: database disk image is malformed (code 11)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnection.nativeExecuteForString(Native Method)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnection.executeForString(SQLiteConnection.java:634)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   at android.database.sqlite.SQLiteConnection.setLocaleFromConfiguration(SQLiteConnection.java:367)
12-04 19:58:42.219: E/SQLiteOpenHelper(2293):   ... 28 more
12-04 19:58:42.259: D/AndroidRuntime(2293): Shutting down VM
12-04 19:58:42.280: W/dalvikvm(2293): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
12-04 19:58:42.359: E/AndroidRuntime(2293): FATAL EXCEPTION: main
12-04 19:58:42.359: E/AndroidRuntime(2293): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mgr/com.example.mgr.MainActivity}: android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 5 to 6: Drzewo.db
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.os.Looper.loop(Looper.java:137)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.app.ActivityThread.main(ActivityThread.java:5041)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at java.lang.reflect.Method.invokeNative(Native Method)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at java.lang.reflect.Method.invoke(Method.java:511)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at dalvik.system.NativeStart.main(Native Method)
12-04 19:58:42.359: E/AndroidRuntime(2293): Caused by: android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 5 to 6: Drzewo.db
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:245)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at com.example.mgr.DBHelper.createDataBase(DBHelper.java:53)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at com.example.mgr.MainActivity.onCreate(MainActivity.java:73)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.app.Activity.performCreate(Activity.java:5104)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-04 19:58:42.359: E/AndroidRuntime(2293):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-04 19:58:42.359: E/AndroidRuntime(2293):     ... 11 more

我处理 eclipse juno + Android 4.2.2

Answer 1

我无法将所有这些代码放在评论中，所以请尝试以下方法：请记住，我没有添加所有的样板......好吗？

更改checkDb方法：

private boolean checkDataBase(){
     File dbFile = new File( DATABASE_PATH, DATABASE_NAME );
     return dbFile.exists();
}

更改createDb方法：

public void createDataBase() {
    if(checkDb()){
        //do nothing
    } else {
        copyDatabase();
    }
}

更改copyDatabase（）方法：

private void copyDataBase(){
      getReadableDatabase();

      //add the rest of your current implementation

}

将构造函数的可访问性更改为private并添加以下方法：

private DBHelper mInstance = null;
public static DBHelper getInstance(Context context) {
   if(mInstance == null)
        mInstance = new DBHelper(context)
   return mInstance;
}
//remove the old openDatabase method
public SQLiteDatabase openDatabase() {
   return getReadableDatabase(); //or you can use getWritableDatabase();
}

此外我注意到你发布的代码中的数据库版本是18，而你发布的日志中的数据是5或6？你能发布最新的日志......

Answer 2

您遇到的问题是无法打开该文件。可能它的路径有问题（不同的Android版本之间可能会略有不同），无论如何，你永远不应该对它进行硬编码。

您可以使用context.getDatabasePath();获取数据库路径，并将所需名称传递给文件（无论是否存在）。实际上你应该这样做

为此，在任何地方使用String outFileName = DB_PATH + DB_NAME;之类的东西你应该改变它

 String outFileName =myContext.getDatabasePath(DB_NAME).getPath() ;

这是您文件的真正有效位置。所以，你的copyDataBase（）将是这样的

 private void copyDataBase() throws IOException {

    // Open your local db as the input stream
    InputStream myInput = context.getAssets().open("db/" + DATABASE_NAME);

    // Path to the just created empty db
     String outFileName =myContext.getDatabasePath(DB_NAME).getPath() ;

    // 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();

}

和private boolean checkDataBase()

中的相同更改

Answer 3

可能数据库文件实际上已损坏。您可以尝试使用sqlitebrowser

打开它

此外，如果您在计算机中安装了sqlite，则可以执行其他一些检查并尝试将其还原以防万一已损坏。您可以按照以下步骤操作：

获取sqlite here并安装
打开命令添加sqlite oyour environnment变量路径的路径，以便在任何地方启动sqlite命令
转到您拥有数据库的目录，然后启动SQLite：
```
sqlite3 yourfile.db
```
您可以通过以下方式检查数据库完整性：
```
pragma integrity_check;
```
如果它说文件没问题，那么我们就输了！如果它已损坏，我们尝试恢复它。

有时，损坏的sqlite3数据库的最佳解决方案简单而有效：转储和恢复

将数据导出到sql文件：

echo .dump | sqlite3.exe yourdbname.db > yourdbname.sql

更改文件名mv yourdbname.db yourdbname.db.original

使用您的sql创建一个新数据库。

sqlite3.exe -init yourdbname.sql yourdbname.db

使用sqlite浏览器打开新文件，看看会发生什么！

Answer 4

试试这个

db = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS | SQLiteDatabase.OPEN_READWRITE);

无法打开数据库/无法将（数据库）的区域设置更改为“en_US”

4 个答案: