当我第一次运行该应用程序工作正常。但是当我再次尝试打开时，应用程序会出错。我找不到解决方案
我的databasehelper.java
公共类DatabaseHelper扩展了SQLiteOpenHelper {
private SQLiteDatabase myDB;
private Context context;
public static String DB_NAME = "veri_sql2";
public static String DB_PATH = "/data/data/appinventor.ai_kksal55.Fikralar10000/databases/";
public static final int DB_VERSION = 1;
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION, new DBHook());
myDB.loadLibs(context);
this.context = context;
}
static class DBHook implements SQLiteDatabaseHook {
public void preKey(SQLiteDatabase database) {
database.execSQL("PRAGMA cipher_default_kdf_iter = '4000'");
}
public void postKey(SQLiteDatabase database) { }
};
public void encryptDataBase(String passphrase) throws IOException {
File originalFile = context.getDatabasePath(DB_NAME);
File newFile = File.createTempFile("sqlcipherutils", "tmp", context.getCacheDir());
SQLiteDatabase myDB=SQLiteDatabase.openDatabase(originalFile.getAbsolutePath(),"", null,SQLiteDatabase.OPEN_READWRITE);
myDB.rawExecSQL(String.format("ATTACH DATABASE '%s' AS encrypted KEY '%s';",newFile.getAbsolutePath(), passphrase));
myDB.rawExecSQL("SELECT sqlcipher_export('encrypted');");
myDB.rawExecSQL("DETACH DATABASE encrypted;");
myDB.close();
myDB = SQLiteDatabase.openDatabase(newFile.getAbsolutePath(), passphrase, null, SQLiteDatabase.OPEN_READWRITE);
myDB.rawExecSQL("pragma cipher_default_kdf_iter = 4000;");
myDB.close();
originalFile.delete();
newFile.renameTo(originalFile);
}
private boolean checkDataBase() {
File databasePath = context.getDatabasePath(DB_NAME);
return databasePath.exists();
}
public void copyDataBase() throws IOException {
try {
File f = context.getDatabasePath(DB_NAME);
InputStream in = context.getAssets().open(DB_NAME);
OutputStream out = new FileOutputStream(f.getAbsolutePath());
byte[] buffer = new byte[1024];
int length;
while ((length = in.read(buffer)) > 0) {
out.write(buffer, 0, length);
}
out.flush();
out.close();
in.close();
encryptDataBase("kksal");
} catch (Exception e) {
Log.e("copy database", e.getMessage());
}
}
public void openDataBase(String passphrase) throws SQLException {
String myPath = DB_PATH + DB_NAME;
myDB = SQLiteDatabase.openDatabase(myPath, passphrase, null, SQLiteDatabase.OPEN_READWRITE);
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase("");
try {
copyDataBase();
} catch (IOException e) {
Log.e("create database", e.getMessage());
}
}
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
和MainActivity.java
public class MainActivity extends Activity {
private ProgressDialog progressDialog;
Cursor c=null;
private DatabaseHelper kategoriler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
DatabaseHelper myDbHelper = new DatabaseHelper(MainActivity.this);
try { myDbHelper.createDataBase();}
catch (IOException ioe) {throw new Error("Veritabanı oluşturulamadı! Uygulamayı yeniden başlatınız");}
try { myDbHelper.openDataBase("kksal");}
catch(SQLException sqle){ throw sqle; }
Intent intent = new Intent("appinventor.ai_kksal55.Fikralar10000.ANAEKRAN");
startActivity(intent);
finish();
//new LoadViewTask().execute();
}
成功复制SQLite文件。 数据库已加密。并访问记录。一切都很正常。但是我关闭了应用程序。它不会再打开。它在以下行中给出错误。 在databasehelper.java中
myDB = SQLiteDatabase.openDatabase(myPath, passphrase, null, SQLiteDatabase.OPEN_READWRITE);
如果它在我不使用DBHook（）时有效。如果我删除dbhook查询需要很长时间。
屏幕上出现错误
E/Database: file is encrypted or is not a database: , while compiling: select count(*) from sqlite_master;
net.sqlcipher.database.SQLiteException: file is encrypted or is not a database: , while compiling: select count(*) from sqlite_master;
at net.sqlcipher.database.SQLiteCompiledSql.native_compile(Native Method)
at net.sqlcipher.database.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
at net.sqlcipher.database.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
at net.sqlcipher.database.SQLiteProgram.<init>(SQLiteProgram.java:83)
at net.sqlcipher.database.SQLiteQuery.<init>(SQLiteQuery.java:49)
at net.sqlcipher.database.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
at net.sqlcipher.database.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1787)
at net.sqlcipher.database.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1752)
at net.sqlcipher.database.SQLiteDatabase.keyDatabase(SQLiteDatabase.java:2427)
at net.sqlcipher.database.SQLiteDatabase.openDatabaseInternal(SQLiteDatabase.java:2356)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1116)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1083)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1032)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:986)
at appinventor.ai_kksal55.Fikralar10000.DatabaseHelper.openDataBase(DatabaseHelper.java:75)
at appinventor.ai_kksal55.Fikralar10000.MainActivity.onCreate(MainActivity.java:29)
at android.app.Activity.performCreate(Activity.java:5387)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2351)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2449)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5353)
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:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
我该怎么做才能解决此错误。