Question

有人引导我发布plzzzz。我有一个基本的android-sqlite-database应用程序来进行CRUD操作。当我在/data/data/package-name/mydatabase.db上进行操作时，它工作正常。但现在我必须将数据库文件嵌入到应用程序中。我已将 .db 文件放在assets文件夹中并编写此代码。但面对如下所述的连续问题....我的 DatabaseHandler 类如下....

private static final String DATABASE_PATH = "com.example.database_abc/assets/contactsDB.db" ; 
private static final String DATABASE_NAME = "contactsDB";
private  SQLiteDatabase myDatabase ;
private final Context myContext ;

public DatabaseHandler3(Context context){
    super(context, DATABASE_NAME, null, 1);
    this.myContext = context ;

}

public boolean checkDatabase(){
    SQLiteDatabase checkDB = null ;
    try{
        checkDB = SQLiteDatabase.openDatabase( DATABASE_PATH , null, SQLiteDatabase.OPEN_READWRITE);
    }catch(SQLException ioex){
        throw new Error("Database Not Found..........................");
    }

    if(checkDB != null){
        checkDB.close();
    }

    return checkDB != null ? true : false ;
}// End of checkDataBase()


public void openDataBase() throws SQLException{

    //Open the database
    String myPath = DATABASE_PATH ;
    myDatabase = SQLiteDatabase.openDatabase(DATABASE_PATH, null, SQLiteDatabase.OPEN_READWRITE);

   }

@Override
public void onCreate(SQLiteDatabase db){

}
@Override
public void onUpgrade(SQLiteDatabase db, int arg1, int arg2){

}

我的Logcat如下..

12-13 17:24:29.244: E/SQLiteLog(5563): (14) cannot open file at line 30176 of [00bb9c9ce4]
12-13 17:24:29.244: E/SQLiteLog(5563): (14) os_unix.c:30176: (2) open(//com.example.database_abc/assets/contactsDB.db3) - 
12-13 17:24:29.384: E/SQLiteDatabase(5563): Failed to open database 'com.example.database_abc/assets/contactsDB.db3'.
12-13 17:24:29.384: E/SQLiteDatabase(5563): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at com.example.database_abc.DatabaseHandler3.checkDatabase(DatabaseHandler3.java:27)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at com.example.database_abc.MainActivity.onButtonClick(MainActivity.java:55)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at java.lang.reflect.Method.invokeNative(Native Method)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at java.lang.reflect.Method.invoke(Method.java:511)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.view.View$1.onClick(View.java:3592)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.view.View.performClick(View.java:4202)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.view.View$PerformClick.run(View.java:17340)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.os.Handler.handleCallback(Handler.java:725)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.os.Looper.loop(Looper.java:137)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at android.app.ActivityThread.main(ActivityThread.java:5039)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at java.lang.reflect.Method.invokeNative(Native Method)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at java.lang.reflect.Method.invoke(Method.java:511)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-13 17:24:29.384: E/SQLiteDatabase(5563):     at dalvik.system.NativeStart.main(Native Method)
12-13 17:24:29.384: D/AndroidRuntime(5563): Shutting down VM
12-13 17:24:29.394: W/dalvikvm(5563): threadid=1: thread exiting with uncaught exception (group=0x40a70930)
12-13 17:24:29.504: E/AndroidRuntime(5563): FATAL EXCEPTION: main
12-13 17:24:29.504: E/AndroidRuntime(5563): java.lang.IllegalStateException: Could not execute method of the activity
12-13 17:24:29.504: E/AndroidRuntime(5563):     at android.view.View$1.onClick(View.java:3597)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at android.view.View.performClick(View.java:4202)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at android.view.View$PerformClick.run(View.java:17340)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at android.os.Handler.handleCallback(Handler.java:725)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at android.os.Looper.loop(Looper.java:137)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at android.app.ActivityThread.main(ActivityThread.java:5039)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at java.lang.reflect.Method.invokeNative(Native Method)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at java.lang.reflect.Method.invoke(Method.java:511)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at dalvik.system.NativeStart.main(Native Method)
12-13 17:24:29.504: E/AndroidRuntime(5563): Caused by: java.lang.reflect.InvocationTargetException
12-13 17:24:29.504: E/AndroidRuntime(5563):     at java.lang.reflect.Method.invokeNative(Native Method)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at java.lang.reflect.Method.invoke(Method.java:511)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at android.view.View$1.onClick(View.java:3592)
12-13 17:24:29.504: E/AndroidRuntime(5563):     ... 11 more
12-13 17:24:29.504: E/AndroidRuntime(5563): Caused by: java.lang.Error: Database Not Found..........................
12-13 17:24:29.504: E/AndroidRuntime(5563):     at com.example.database_abc.DatabaseHandler3.checkDatabase(DatabaseHandler3.java:29)
12-13 17:24:29.504: E/AndroidRuntime(5563):     at com.example.database_abc.MainActivity.onButtonClick(MainActivity.java:55)
12-13 17:24:29.504: E/AndroidRuntime(5563):     ... 14 more

Answer 1

不确定你是如何创建数据库的，但是使用类似Firefox SQLiteManager的东西来创建，然后粘贴到assets目录对我来说一直很好。另一个原因可能是版本不兼容，或者某些内容很简单（db3与db或sqlite）。

Answer 2

这是我用来创建使用只读sqlite数据库的应用程序的教程：

http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/

它提供了将资产文件夹中打包的数据库移动到“/data/data/XX.XXX.XX/databases”位置的最终静止位置所需的所有代码。

如果您的数据库很大，也可以读取此链接：

http://ponystyle.com/blog/2010/03/26/dealing-with-asset-compression-in-android-apps/

Answer 3

不要对此有什么不妥，但我认为你应该更好地尝试这个

SQLiteDatabase.openOrCreateDatabase（path，factory）;

如何在Android应用程序中嵌入sqlite-database-file

3 个答案: