我的数据库没有出现

Question

I created the next database: encuestadoSQLiteHelper encuestado = new encuestadoSQLiteHelper(this, "DBEncuestado", null, 1); final SQLiteDatabase db = encuestado.getWritableDatabase(); encuestadoSQLiteHelper encuestado = new encuestadoSQLiteHelper(this, "DBEncuestado", null, 1); final SQLiteDatabase db = encuestado.getWritableDatabase();

And here:

Intent pas = new Intent(encuesta.this, MainActivity.class);
                Toast.makeText(context,"¡Encuesta enviada!",Toast.LENGTH_LONG).show();
                startActivity(pas);
                String nombre = "Pablo";
                db.execSQL("INSERT INTO Encuestado (nombre) " +
                        "VALUES ('" + nombre +"')");
                db.close();

Database is not being created, because i go to documents/sdcard/data/ and my application package don't appears. I need help, thanks!

Answer 1

Database is created, but Database is not accessible for user. it is only accessible for app which created this database.

If you want to access the database then there are two ways, root your phone or write code to copy database from your application to another folder.

EDIT:

Copy database from code to Sdcard

try {
        File sd = Environment.getExternalStorageDirectory();
        File data = Environment.getDataDirectory();

        if (sd.canWrite()) {
            String currentDBPath = "/data/"+YOUR_PACKAGE_NAME+"/databases/"+DATABASE_NAME;
            String backupDBPath = "backdatabase.sqlite";
            File currentDB = new File(data, currentDBPath);
            File backupDB = new File(sd, backupDBPath);

            if (currentDB.exists()) {
                FileChannel src = new FileInputStream(currentDB).getChannel();
                FileChannel dst = new FileOutputStream(backupDB).getChannel();
                dst.transferFrom(src, 0, src.size());
                src.close();
                dst.close();
            }
        }
    } catch (Exception e) {
     System.out.println("error in data base copy:"+e);
    }

And also you have permission in menifest file for accessing SDCard:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Answer 2

You can use this code to export the file to be accessible in your storage

private void exportDB() throws Exception {
    new Thread(new Runnable() {

        @Override
        public void run() {
            try {
                File sd = context.getExternalCacheDir();
                File data = Environment.getDataDirectory();
                FileChannel source = null;
                FileChannel destination = null;
                StringBuilder localPath = new StringBuilder();
                localPath.append(context.getExternalCacheDir().toString()).append("/");
                String currentDBPath = "/data/" + YOUR_PACKAGE_HERE + "/databases/" + DATABASE_NAME;
                String backupDBPath = DATABASE_NAME;
                File currentDB = new File(data, currentDBPath);
                File backupDB = new File(sd, backupDBPath);
                source = new FileInputStream(currentDB).getChannel();
                destination = new FileOutputStream(backupDB).getChannel();
                destination.transferFrom(source, 0, source.size());
                source.close();
                destination.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }).start();
}