Saving a constantly changing score in an android app

Question

I'm creating an android app in java, the score in the game changes all the time, multiple times every second. I want to create a save file to be able to keep track of the score when the user comes back to the app, the thing is how should I go about saving it? Seems extremely inefficient to write to the save file multiple times every second whenever the score changes. I thought about saving it in the onDestroy() method, but I heard it's not guaranteed that it would be called...

So what would be a guaranteed way for the score to be saved while not having to access file multiple times every second?

Answer 1

You can have a SharedPreferences used to store data that belong to an app.

To add value to the SharedPreferences

//Whenever you update the score call this function
void updateScore(int score){

    SharedPreferences mySharedPref = getSharedPreferences("give Any Name", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = mySharedPref.edit();
    editor.putInt("score", score);
    editor.apply();  //this function will commit asynchronously

}

If you need to get the score at any time call this function.

//Whenever you update the score call this function
public int getScore(){

    SharedPreferences mySharedPref = getSharedPreferences("give Any Name", Context.MODE_PRIVATE);
    return mySharedPref.getInt("score", -1); //-1 is the default value that is returned if the value is not set using putInt

}