copy and use external database in android

java class for copy external database into internal storage

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;

/**
 * Created by AndroMedia on 8/3/2016.
 */
public class DataBaseClass extends SQLiteOpenHelper {
    String DB_PATH = null;

    public static String DB_NAME = "ExternalDB";//your database name witch into assets folder!
    private SQLiteDatabase myDataBase;
    private final Context myContext;



    public DataBaseClass (Context context) {

        super(context, DB_NAME, null, 2);
        this.myContext = context;
        DB_PATH = "/data/data/" + context.getPackageName() + "/" + "databases/";
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

    }

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

    }



    public void createDataBase() throws IOException {//main function witch must you call it!

        boolean dbExist = checkDataBase();

        if (dbExist) {
            // do nothing - database already exist
        } else {

            // By calling this method and empty database will be created into
            // the default system path
            // of your application so we are gonna be able to overwrite that
            // database with our database.
            this.getReadableDatabase();

            try {

                copyDataBase();

            } catch (IOException e) {

                throw new Error("Error copying database");

            }
        }

    }

    private boolean checkDataBase() { //check database exist... if exist return true else false

        SQLiteDatabase checkDB = null;


        try {
            String myPath = DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null,
                    SQLiteDatabase.OPEN_READONLY);


        } catch (SQLiteException e) {

            // database does't exist yet.

        }

        if (checkDB != null) {

            checkDB.close();

        }

        return checkDB != null ? true : false;
    }
    private void copyDataBase() throws IOException {
        //function for copy DB file as assets folder to internal storage mobile!


        // Open your local db as the input stream
        InputStream myInput = myContext.getAssets().open(DB_NAME);

        // Path to the just created empty db
        String outFileName = DB_PATH + DB_NAME;

        // Open the empty db as the output stream
        OutputStream myOutput = new FileOutputStream(outFileName);

        // transfer bytes from the inputfile to the outputfile
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer)) > 0) {
            myOutput.write(buffer, 0, length);
        }

        // Close the streams
        myOutput.flush();
        myOutput.close();
        myInput.close();

    }
    public void openDataBase() throws SQLException {
        //function for open db after copy it !

        // Open the database
        String myPath = DB_PATH + DB_NAME;
        // SQLiteDatabase.NO_LOCALIZED_COLLATORS
        myDataBase = SQLiteDatabase.openDatabase(myPath, null,
                SQLiteDatabase.OPEN_READONLY
                        | SQLiteDatabase.NO_LOCALIZED_COLLATORS
                        | SQLiteDatabase.CREATE_IF_NECESSARY);

    }



}

you must call craeteDateBase function into MainActivity for copy database file into assets to phone storage

public boolean copyDataBaseIntoInterrnalStorage(){
    boolean result;
    dataBaseClass=new DataBaseClass(this);
    try {
        dataBaseClass.createDataBase();
        result=true;
    }catch (Exception ex){
        result=false;
    }
    return result;
}

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