copying database file from /assets to /data/data folder in file explorer - Android

Question

I have issues in copying database file from /assets to /data/data folder in file explorer. I have searched this website, found many answers, but could not find the appropriate a

Answer 1

Try using below code to copy database from assets to data/data/package directory

package com.example.myapp;

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;

      public class DataBaseHelper1 extends SQLiteOpenHelper{
      private static String DB_PATH = "/data/data/com.example.myapp/databases/";

      private static String DB_NAME = "myDB.sqlite";

      private SQLiteDatabase myDataBase;

      private final Context myContext;

      public DataBaseHelper1(Context context) 
      {
          super(context, DB_NAME, null, 1);
          this.myContext = context;
      }

      public void createDataBase() throws IOException{


    boolean dbExist = checkDataBase();

      if(dbExist)
      {
          Log.i("DB....", "database available....");
      }
      else
      {
          this.getWritableDatabase();

          try {

          copyDataBase();

          } catch (IOException e) {

          throw new Error("Error copying database");

          }

         Log.i("DB..", "database created.....");
       }   

      }


      public boolean checkDataBase(){

      SQLiteDatabase checkDB = null;

      try{

      String myPath = DB_PATH + DB_NAME;

      checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);

      }catch(SQLiteException e){

          Log.e("CheckDb","DB not found");
      //database does't exist yet.

      if(checkDB != null){

      checkDB.close();

      }
      }
      finally
      {
          if(checkDB != null){

              checkDB.close();

              } 
          this.close();
      }
      return checkDB != null ? true : false;

      }




      private void copyDataBase() throws IOException{

      InputStream myInput = myContext.getAssets().open(DB_NAME);

      String outFileName = DB_PATH + DB_NAME;

      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 SQLiteDatabase openDataBase() throws SQLException{

      String myPath = DB_PATH + DB_NAME;

      return myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);

      }


      @Override

      public synchronized void close() {

      if(myDataBase != null)

      myDataBase.close();

      super.close();

      }

      @Override

      public void onCreate(SQLiteDatabase db) {

      }

      @Override

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


      }  


      public void getData()
      {
          SQLiteDatabase myDB ;
          Cursor cursor ;
           try {

                myDB=this.openDataBase();                   

                    cursor=myDB.rawQuery("SELECT * FROM Country_Master",null);


                    if (cursor != null ) {
                       if  (cursor.moveToFirst()) {
                       do {

                           // put your code to get data from cursor                      

                       }while (cursor.moveToNext());
                       }

                    }



                   if(cursor != null)
                    {
                        myDB.close();
                       cursor.close();
                    }                      
                    }catch(SQLException sqle){

                    throw sqle;

                    }


        }
}

Also put this code under onCreate method in your activity where you want to copy database..

 DataBaseHelper1 myDbHelper = new DataBaseHelper1(MyActivity.this); 
     try 
     {
         myDbHelper.createDataBase();
     }catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            }

     finally
     {
         myDbHelper.close();
     }