Failed to open Database Android Java SQLite

Question

Here is my code:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

           


        

Answer 1

I would recommend to use a SQLiteOpenHelper, if you need a private database for your application:

public class MyDatabaseHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "DatabaseName";
    private static final int DATABASE_VERSION = 1;
    private static final String TABLE_CREATE = "CREATE TABLE ....";

    public MyDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase database) {
        database.execSQL(TABLE_CREATE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase database,int oldVersion,int newVersion){
        // do whatever is required for the upgrade 
    }
}

Here you find a full example. If you want to open a database from SD card, use:

File file = new File("/sdcard/db.sqlite" ); 
SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(file, null);
Log.d("MyApp", "Successfully opened: "  + db.isOpen());

For the first case you don't need any particular permissions. For the second one you do. Note: Android 4.3 and 4.4 do restrict the access on the SD card. So it might be that you cannot access the database file at all (see for instance this article).