Saving the Activity state in android?

Question

Hello guys I've ColorPicker in my app. When I set the color selected by ColorPicker to the Activity background, it works. But when I restart the app, the color changes to default! How to save the state of Activity? Is it possible? Thanks in advance!!!

considering you're quitting the application and opening it, you're supposed to store the data in `SharedPreferences`. — EpicPandaForce, May 16 '15 at 14:50
http://developer.android.com/guide/topics/data/data-storage.html#pref — antonio, May 16 '15 at 14:54
[example question from stackowerflow](http://stackoverflow.com/questions/3624280/how-to-use-sharedpreferences-in-android-to-store-fetch-and-edit-values) — Kasun Dissanayake, May 16 '15 at 14:56
Please guys can you show me an example? I'm unable to study this code and know how to use it! — Ajinkya More, May 16 '15 at 14:56

score 3 · Accepted Answer · edited May 16 '15 at 15:55

3

So for example you can save the color like this (I've just put a hex color reference but you can change it to whatever you wish):

public void setBackgroundColor() {
    SharedPreferences sharedPreferences = getPreferences(Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putString("color", "#FFFFFF");
    editor.commit();
}

Then just make sure you call this method every time it loads / reloads:

public void getBackgroundColor() {
    SharedPreferences sharedPreferences = getPreferences(Context.MODE_PRIVATE);
    if (sharedPreferences.contains("color")) {
        String myColor = sharedPreferences.getString("color", null);
        mybackground.setBackgroundColor(Color.parseColor(myColor));
    }
}

edited May 16 '15 at 15:55

Bruno Parmentier

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answered May 16 '15 at 15:00

Andy Joyce

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just for using methods +1 – Petro May 16 '15 at 15:08
How can I put `int` instead of "#FFFFFF"? – Ajinkya More May 16 '15 at 15:40
Just change the putString and getString to putInt and getInt :) – Andy Joyce May 16 '15 at 15:43

score 2 · Answer 2 · answered May 16 '15 at 15:04

Andy's Answer is correct. However, I thought I would chime in on saving and loading preferences. These are universal Save/Load methods for Strings. It's what I use in all my activities. It can save you a lot of headaches in the future!

 public static String PREFS_NAME = "random_pref"; 

 static public boolean setPreference(Context c, String value, String key) {
        SharedPreferences settings = c.getSharedPreferences(PREF_NAME, 0);
        settings = c.getSharedPreferences(PREF_NAME, 0);
        SharedPreferences.Editor editor = settings.edit();
        editor.putString(key, value);
        return editor.commit();
    }

    static public String getPreference(Context c, String key) {
        SharedPreferences settings = c.getSharedPreferences(PREF_NAME, 0);
        settings = c.getSharedPreferences(PREFS_NAME , 0);
        String value = settings.getString(key, "");
        return value;
    }

Saving the Activity state in android?

2 Answers2