public void onClick(View v) {
        if (v.getId()==R.id.loadDataId){

            SharedPreferences sharedPreferences = getSharedPreferences("Mydata",MODE_PRIVATE);
            String name = sharedPreferences.getString("uname",DEFAULTVALUE);
            String pass = sharedPreferences.getString("pass",DEFAULTVALUE);

            if (name.equals(DEFAULTVALUE)|| pass.equals(DEFAULTVALUE)){

                Toast.makeText(this, "No Data was found", Toast.LENGTH_SHORT).show();
            }else {

                unamrTextView.setText(name);
                passTextView.setText(pass);

                Toast.makeText(this, "Data retrive successfully", Toast.LENGTH_SHORT).show();
            }

        }else if (v.getId()==R.id.backId){
            Intent intent = new Intent(this,MainActivity.class);
            startActivity(intent);
            Toast.makeText(this, "Go to Main Activity", Toast.LENGTH_SHORT).show();
        }

    }