public class Utils {
	
    private static String DB_PATH = "/data/data/packge-name-app/databases/";
    private static String DB_NAME = "database_db";
	
	static public void createDataBase() throws IOException {
   	 
    	boolean dbExist = checkDataBase();
     	if(!dbExist){
        	try {
     			copyDataBase();
     		} catch (IOException e) {
         		throw new Error("Error copying database: " + e.getMessage());
         	}
    	}
 
    }
    
    static public boolean checkDataBase(){
    	 
    	SQLiteDatabase checkDB = null;
     	try{
    		String myPath = DB_PATH + DB_NAME;
    		checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
    	} catch(SQLiteException e){
    	}
 
    	if(checkDB != null){
     		checkDB.close();
     	}
 
    	return checkDB != null ? true : false;
    }
    
    static public void copyDataBase() throws IOException {
    	
    	File dir = new File(DB_PATH);
		if (!dir.exists()) dir.mkdir();
    	
    	InputStream myInput = context.getAssets().open("database_aa");
        InputStream myInput2 = context.getAssets().open("database_ab");
        InputStream myInput3 = context.getAssets().open("database_ac");
         
        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);
        }
        while ((length = myInput2.read(buffer))>0){
            myOutput.write(buffer, 0, length);
        }
        while ((length = myInput3.read(buffer))>0){
            myOutput.write(buffer, 0, length);
        }

        myOutput.flush();
        myOutput.close();
        myInput.close();
        myInput2.close(); 
    }
	
}