由于客戶對移動端的數(shù)據(jù)庫有加密需求绎速，并且最近要優(yōu)化性能纹冤，所以升級了net.zetetic:android-database-sqlcipher庫，但是卻造成程序崩潰雁歌，異常如下：

Caused by: net.sqlcipher.database.SQLiteException: file 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:89)

? ? ? ? at net.sqlcipher.database.SQLiteQuery.<init>(SQLiteQuery.java:48)

? ? ? ? at net.sqlcipher.database.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:60)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1954)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1840)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.keyDatabase(SQLiteDatabase.java:2571)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.openDatabaseInternal(SQLiteDatabase.java:2502)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1204)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1258)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1253)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1238)

? ? ? ? at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1274)

? ? ? ? at org.penguin.project.sqlcipher.MainActivity.InitializeSQLCipher(MainActivity.java:34)

? ? ? ? at org.penguin.project.sqlcipher.MainActivity.onCreate(MainActivity.java:18)

? ? ? ? at android.app.Activity.performCreate(Activity.java:7436)

? ? ? ? at android.app.Activity.performCreate(Activity.java:7426)

? ? ? ? at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1286)

? ? ? ? at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3279)

? ? ? ? at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3484)?

? ? ? ? at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86)?

? ? ? ? at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)?

? ? ? ? at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)?

? ? ? ? at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2123)?

? ? ? ? at android.os.Handler.dispatchMessage(Handler.java:109)?

? ? ? ? at android.os.Looper.loop(Looper.java:207)?

? ? ? ? at android.app.ActivityThread.main(ActivityThread.java:7470)?

? ? ? ? at java.lang.reflect.Method.invoke(Native Method)?

? ? ? ? at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)?

? ? ? ? at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:958)?

經(jīng)過研究發(fā)現(xiàn)，可以通過以下代碼解決崩潰問題：

SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(databasePath, ZeteticApplication.DATABASE_PASSWORD, null, new SQLiteDatabaseHook() {

@Override

? ? public void preKey(SQLiteDatabase database) {

}

@Override

? ? public void postKey(SQLiteDatabase database) {

database.execSQL("PRAGMA cipher_page_size = 1024");

? ? ? ? database.execSQL("PRAGMA kdf_iter = 64000");

? ? ? ? database.execSQL("PRAGMA cipher_hmac_algorithm = HMAC_SHA1");

? ? ? ? database.execSQL("PRAGMA cipher_kdf_algorithm = PBKDF2_HMAC_SHA1");

? ? }

});

至于涉及到到greendao如何解決较坛，明天再研究下扒最，如果需要弄清楚參數(shù)的作用吧趣，請參考下面的網(wǎng)址：

https://www.zetetic.net/sqlcipher/sqlcipher-api/#key

另外提醒下，PRAGMA部分的語句必須放在postKey方法中執(zhí)行岔霸，否則也會崩潰俯渤。