How correctly save game progress via libGDX Preferences on Android devices?

Question

I am using next code. This code work fine on desktop version, but on Android device does not. return Gdx.app.getPreferences(PREFS_NAME) always is null. Why? Where I could make mistake?

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Preferences;

public class BeatlesPreferences {
    // constants
    private static final String PREF_VIBRO = "vibro";
    private static final String PREF_MUSIC_ENABLED = "musicenabled";
    private static final String PREF_SOUND_ENABLED = "soundenabled";
    private static final String PREFS_NAME = "my_app";

    public BeatlesPreferences() {
    }

    protected Preferences getPrefs() {
        return Gdx.app.getPreferences(PREFS_NAME);
    }

    public boolean isSoundEffectsEnabled() {
        return getPrefs().getBoolean(PREF_SOUND_ENABLED, true);
    }

    public void setSoundEffectsEnabled(boolean soundEffectsEnabled) {
        getPrefs().putBoolean(PREF_SOUND_ENABLED, soundEffectsEnabled);
        getPrefs().flush();
    }

    public boolean isMusicEnabled() {
        return getPrefs().getBoolean(PREF_MUSIC_ENABLED, true);
    }

    public void setMusicEnabled(boolean musicEnabled) {  
        getPrefs().putBoolean(PREF_MUSIC_ENABLED, musicEnabled);
        getPrefs().flush();
    }

    public boolean isVibroEnabled() {
        return getPrefs().getBoolean(PREF_VIBRO, true);
    }

    public void setVibroEnabled(boolean vibro) {
        getPrefs().putBoolean(PREF_VIBRO, vibro);
        getPrefs().flush();
    }
}

Please include the error stacktrace. I suspect you're reaching `getPrefs` before Gdx.app is initialized (though that should be the similar to the desktop). You should consider adding some `assert` checks that Gdx.app is non-null to distinguish from `getPreferences` returning null, etc. — P.T., Jul 23 '12 at 17:43

Nurmuhammad · Accepted Answer · 2013-06-29T00:38:20.093

11

Use like this:

   private Preferences preferences;
   protected Preferences getPrefs() {
      if(preferences==null){
         preferences = Gdx.app.getPreferences(PREFS_NAME);
      }
   return preferences;
   }

edited Jun 29 '13 at 00:38

answered Jun 29 '13 at 00:26

Nurmuhammad

136
2
8

score 0 · Answer 2 · edited Aug 15 '17 at 17:41

0

you are not setting the name of the app in .prefs in any way in your code. Add the name just like you added music, vibro...etc

public void setPREFS_NAME() {
    getPrefs().putBoolean("PREFS_NAME", PREFS_NAME);
    getPrefs().flush();
}

edited Aug 15 '17 at 17:41

Sergei Bubenshchikov

5,275
3
33
60

answered Jan 03 '15 at 15:07

Karani.pranay

191
2
11

How correctly save game progress via libGDX Preferences on Android devices?

2 Answers2

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