sqlite数据库（代码14）错误

Question

可以请任何人帮助我:(

我想制作书籍并使用这些代码：

public class Main extends Activity {

    private database db; 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        db = new database(this); 
        db.useable();

    }

}

和数据库类：

public class database extends SQLiteOpenHelper { 

    public final String   path = "data/data/com.example.book/databases/"; 
    public final String   Name = "database";                             
    public SQLiteDatabase mydb;                                          

    private final Context mycontext;


    public database(Context context) { 

        super(context, "database", null, 1);
        mycontext = context;

    }


    @Override
    public void onCreate(SQLiteDatabase arg0) {
        // TODO Auto-generated method stub

    }


    @Override
    public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
        // TODO Auto-generated method stub

    }


    public void useable() {

        boolean checkdb = checkdb();

        if (checkdb) {

        } else {

            this.getReadableDatabase();

            try {
                copydatabase();
            }
            catch (IOException e) {}

        }

    }


    public void open() {

        mydb = SQLiteDatabase.openDatabase(path + Name, null,
                SQLiteDatabase.OPEN_READWRITE);

    }


    @Override
    public void close() {
        mydb.close();
    }


    public boolean checkdb() {

        SQLiteDatabase db = null;
        try {
            db = SQLiteDatabase.openDatabase(path + Name, null,
                    SQLiteDatabase.OPEN_READONLY);
        }
        catch (SQLException e) {

        }
        mydb.close();
        return db != null ? true : false;

    }


    public void copydatabase() throws IOException {

        OutputStream myOutput = new FileOutputStream(path + Name);
        byte[] buffer = new byte[1024];
        int length;
        InputStream myInput = mycontext.getAssets().open(Name);
        while ((length = myInput.read(buffer)) > 0) {
            myOutput.write(buffer, 0, length);
        }
        myInput.close();
        myOutput.flush();
        myOutput.close();
    }

但我强行关闭了这些错误

E/SQLiteDatabase(1567): Failed to open database 'data/data/com.example.book/databases/database'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database

我的数据库文件位于assets文件夹中，带有＆＃34;数据库＆＃34;名字，我的模拟器是genymotion

Answer 1

试试这个： 取代

public final String   path = "data/data/com.example.book/databases/";

与

String yourPath = myContext.getFilesDir().getAbsolutePath().replace("files",
"databases")+File.separator + DB_NAME;