How to use external database in android

Here in code for use external database in android project. 
1) first put your .db file(database file ) in assets folder
2) then use below code for copy database into project package.
package com.mobidhan.databasecopy;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
public class DataBaseCopy extends SQLiteOpenHelper{
private static String database_n;//database name
private static String database_p ;//database path
private static final int DATABASE_VERSION = 2;
private static String DatabaseName;
private SQLiteDatabase dataBase;
private final Context dbContext;
//DB_NAME is name of database which is in assets folder
//path is our package name
public DataBaseCopy(Context context,String DB_NAME,String PATH) {
super(context, DB_NAME, null, DATABASE_VERSION);
DatabaseName=DB_NAME;
database_p="/data/data/"+PATH+"/databases/";
this.dbContext = context;
database_n = DatabaseName;
// checking database and open it if exists
if (checkDataBase()) {
openDataBase();
} else
{
try {
this.getReadableDatabase();
copyDataBase();
this.close();
openDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
Toast.makeText(context, "database is created", Toast.LENGTH_LONG).show();
}
}
private void copyDataBase() throws IOException{
InputStream myInput = dbContext.getAssets().open(database_n);
String outFileName = database_p + database_n;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
String dbPath = database_p + database_n;
dataBase = SQLiteDatabase.openDatabase(dbPath, null, SQLiteDatabase.OPEN_READWRITE);
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
boolean exist = false;
try {
String dbPath = database_p + database_n;
checkDB = SQLiteDatabase.openDatabase(dbPath, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
Log.v("santosh", "database error");
}
if (checkDB != null) {
Log.v("santosh", "database exist");
exist = true;
checkDB.close();
}
return exist;
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}