public void readFromSharedPreferences() {

        SharedPreferences sharedPreferences = MainActivity.this.getSharedPreferences("HighScoreData", MODE_PRIVATE);
        highScore = Double.parseDouble(sharedPreferences.getString("highScore", "0"));

}



public void writeToSharedPreferences() {

        SharedPreferences sharedPreferences = MainActivity.this.getSharedPreferences("GameData", MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString("highScore", "" + highScore).apply();

}

 public void wipeSharedPreferences(){

        SharedPreferences sharedPreferences = MainActivity.this.getSharedPreferences("GameData", MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString("highScore", "" + 0).apply();
}