我正在尝试使用 sqlcipher lib 从现有数据库加密我的数据库,但在访问旧数据库(即打开数据库)时会出现以下异常:
02-27 13:12:21.231: E/AndroidRuntime(14687): FATAL EXCEPTION: main
02-27 13:12:21.231: E/AndroidRuntime(14687): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.sqlcipher/example.SQLDemoActivity}: net.sqlcipher.database.SQLiteException: file is encrypted or is not a database
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2211)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.app.ActivityThread.access$600(ActivityThread.java:149)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1300)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.os.Handler.dispatchMessage(Handler.java:99)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.os.Looper.loop(Looper.java:153)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.app.ActivityThread.main(ActivityThread.java:4987)
02-27 13:12:21.231: E/AndroidRuntime(14687): at java.lang.reflect.Method.invokeNative(Native Method)
02-27 13:12:21.231: E/AndroidRuntime(14687): at java.lang.reflect.Method.invoke(Method.java:511)
02-27 13:12:21.231: E/AndroidRuntime(14687): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
02-27 13:12:21.231: E/AndroidRuntime(14687): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
02-27 13:12:21.231: E/AndroidRuntime(14687): at dalvik.system.NativeStart.main(Native Method)
02-27 13:12:21.231: E/AndroidRuntime(14687): Caused by: net.sqlcipher.database.SQLiteException: file is encrypted or is not a database
02-27 13:12:21.231: E/AndroidRuntime(14687): at net.sqlcipher.database.SQLiteDatabase.native_setLocale(Native Method)
02-27 13:12:21.231: E/AndroidRuntime(14687): at net.sqlcipher.database.SQLiteDatabase.setLocale(SQLiteDatabase.java:2102)
02-27 13:12:21.231: E/AndroidRuntime(14687): at net.sqlcipher.database.SQLiteDatabase.<init>(SQLiteDatabase.java:1968)
02-27 13:12:21.231: E/AndroidRuntime(14687): at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:901)
02-27 13:12:21.231: E/AndroidRuntime(14687): at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:944)
02-27 13:12:21.231: E/AndroidRuntime(14687): at net.sqlcipher.database.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:107)
02-27 13:12:21.231: E/AndroidRuntime(14687): at example.SQLDemoActivity.onCreate(SQLDemoActivity.java:42)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.app.Activity.performCreate(Activity.java:5020)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
02-27 13:12:21.231: E/AndroidRuntime(14687): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
02-27 13:12:21.231: E/AndroidRuntime(14687): ... 11 more
由于我的旧数据库未加密,因此在这种情况下我应该设置密码
我尝试在密码字符串中传递 null 并使用"传递,但没有运气
向 https://github.com/sqlcipher/android-database-sqlcipher/issues/124 报告的问题
由于我的旧数据库未加密,因此在这种情况下我应该设置密码
SQLCipher for Android 可以使用 ""
作为密码打开未加密的数据库。
我尝试在密码字符串中传递 null 并使用"传递,但没有运气
然后:
- 您的代码中有错误,或者
- 数据库已使用其他密码加密,或者
- 数据库已损坏。
-
检查是否使用了正确的导入:import net.sqlcipher.database.SQLiteDatabase;
-
在应用程序启动时加载库,如下所示:
SQLiteDatabase.loadLibs(this); //this = activity (usually a SplashScreen or MainActivity) db = DatabaseHandler.getInstance(this); //if it's singleton (and i suggest making it as such) db.getReadableDatabase(ConstantsHandler.DATABASE_PASSWORD); db.close();
-
确保它尚未使用密码加密
-
检查文件权限:
android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <使用权限 />