IO Exception when copying db from asset to internal app memory

Question 1

It actually the way i did my code. In my code, i used getWritableDatabase() to create the directory of /data/data//databases. However a dummy db will also be created when i run getWritableDatabase().

So basically instead of running getWritableDatabase(), i made the directory with

public void createDirectory()
    {
        File dbDirectory = new File(DB_PATH);
         if (!dbDirectory.exists())
                dbDirectory.mkdirs();
    }

then i check whether is there a db inside of my /data/data//databases directory and there should not be any database. Hence i am able to copy the db from asset as there is no database in the folder.

Hope this helps anyone with similar problem.

Question 2

Try this Before you accessing the database.

            InputStream input = getResources().getAssets().open("db");
            File f = new File("DB_PATH/databases");
            if (f.mkdirs())
            {
                File ff=new File("DB_PATH/databases");
                FileOutputStream output = new FileOutputStream(ff);
                int data = 0;
                byte[] buffer = new byte[1024];
                while ((data = input.read(buffer)) > 0) {
                    output.write(buffer, 0, data);
                }

                input.close();
                output.close();
                Log.d("File", "File Copied!");
            } else {
                Log.d("File", "AlreadyExists!");
            }
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

Question 3

Try this Hope this help you

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.io.BufferedInputStream;
import java.io.IOException;

public class SmartOpenHelper extends SQLiteOpenHelper {

    private Context context;
    private String DB_SQL;

    SmartOpenHelper(Context context, String dbname, int dbversion, String dbSqlName) throws IOException {
        super(context, dbname, null, dbversion);
        this.context = context;
        this.DB_SQL = dbSqlName;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        try {
            BufferedInputStream inStream = new BufferedInputStream(context.getAssets().open(DB_SQL));
            String sql = "";
            int character = -2;
            do {
                character = inStream.read();
                if ((character != -1) && (character != -2))
                    sql += (char) character;
                else
                    break;
            } while (true);
            System.out.println("onCreate DB SQL = " + sql.split("\n"));
            String[] arrSQL = sql.split("\n");

            for (int i = 0; i < arrSQL.length; i++) {
                db.execSQL(arrSQL[i]);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        try {
            BufferedInputStream inStream = new BufferedInputStream(context.getAssets().open(DB_SQL));
            String sql = "";
            int character = -2;
            do {
                character = inStream.read();
                if ((character != -1) && (character != -2))
                    sql += (char) character;
                else
                    break;
            } while (true);

            System.out.println("onUpgrade DB SQL = " + sql.split("\n"));
            String[] arrSQL = sql.split("\n");
            for (int i = 0; i < arrSQL.length; i++) {
                db.execSQL(arrSQL[i]);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public synchronized void close() {
        super.close();
    }

}

How to use

SmartOpenHelper openHelper = new SmartOpenHelper(this.context, DATABASE_NAME, DATABASE_VERSION, DATABASE_SQL);
SQLiteDatabase db = openHelper.getWritableDatabase();