Reset Wallpaper Once Settings Have Been Changed

[BigWinston]

Hey All,

Quick question I couldn't see answered on the forum...

How can I adapt my live wallpaper (made using y Mimminito's template) to force an update once the settings have been applied? Right now, I have my settings working, but I have to switch to some other wallpaper and back again to force my new settings values to be applied.

I've been looking into the 'onSharedPreferenceChanged' method, but can't seem to hit my breakpoint there.

Thanks!

[tencent]

I have been wondering this as well. The best I can come up with is when you pause and resume you could probably clear your scene and then recreate it but I haven't tested this yet to verify if it works. Also doing this would probably be pretty expensive.

Since I did not feel like testing this. I keep a static reference of my settings and just keep that reference in sync with the settings. This way my update handlers can just refer to the static settings and enable/disable features or modify parameters based on them. I can see how this would not work for every situation but I hope that helps.

[kurloo]

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Using java Syntax Highlighting

1. public class AlphaSettings extends PreferenceActivity implements
2.                 SharedPreferences.OnSharedPreferenceChangeListener {
3.         @Override
4.         protected void onCreate(Bundle icicle) {
5.                 super.onCreate(icicle);
6.                 addPreferencesFromResource(R.xml.setting);
7.                 getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
8.                 Global.isRestart = false;
9.         }
10.  
11.         @Override
12.         protected void onResume() {
13.                 super.onResume();
14.         }
15.  
16.         @Override
17.         protected void onDestroy() {
18.                 getPreferenceManager().getSharedPreferences()
19.                                 .unregisterOnSharedPreferenceChangeListener(this);
20.                 super.onDestroy();
21.         }
22.  
23.         @Override
24.         protected void onStop() {
25.  
26.                 super.onStop();
27.         }
28.  
29.         @Override
30.         public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
31.                         String key) {
32.                 SharedPreferences prefs = PreferenceManager
33.                                 .getDefaultSharedPreferences(this);
34.                
35.                 Global.isRestart = true;
36.         }
37. }

Parsed in 0.033 seconds, using GeSHi 1.0.8.4

just add a listener to observe the event.

[BigWinston]

Thanks! I'll give it a try and post my result...

[BigWinston]

OK, so I'm able to detect when the settings change, but its not updating the wallpaper in the preview screen, or on the main screen. I still have to select a different wallpaper and then switch back to my wallpaper.

Any ideas?

[kurloo]

you should have a look at the link http://developer.android.com/resources/samples/Home/index.html

you need to override the onResume method.when changing to the preview screen.it would be running.
you may change the engine's scene here which you had set in the onLoadScene method. such as using an another scene or reseting the current scene. and then the engine will call his start method to render.

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Using java Syntax Highlighting

1. @Override
2.         protected void onResume() {
3.                
4.                 if (Global.isRestart) {
5.                         //change the scene.
6.                 }
7.                 super.onResume();// call the engine's start method.    this.mEngine.start();
8.         }

Parsed in 0.031 seconds, using GeSHi 1.0.8.4

[greentrucksoftware]

Hmm, I tried this and in the onResume call I have some code that removes some sprites and adds some new ones. Works fine, but if I tap the Set Wallpaper button before this update is finished I get an array out of bounds error similar to adding/removing sprites not on the update thread.

Anyone else seen this? Maybe I'm missing something.

[kurloo]

make sure that all the thread are not running.
the homescreen 's . or the preview's. that's two, but there is only one andengine instance.

if you want to change the resources staticly. you should do like the following:
1.other threads are not running
2.update(the main thread).
3.other threads could go on running.

you may take a look at bellow, 46035e28 is the preview's renderer engine, 46033ea0 is the home screen's:

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Using java Syntax Highlighting

1. : service.oncreate
2. : service.onloadResources
3. : service.onLoadScene
4. : service.onLoadComplete
5. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...service.onCreateEngine
6. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.setEGLConfigChooser
7. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.setRenderer
8. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.setRenderMode
9. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.onCreateSurface
10. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.onSurfaceCreated
11. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.onSurfaceChanged
12. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.oncVisChanged
13. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.onResume
14. : service.onresume
15. : onTouchEvent
16. : onTouchEvent
17. : onTouchEvent
18. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...service.onCreateEngine
19. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...engine.setEGLConfigChooser
20. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...engine.setRenderer
21. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...engine.setRenderMode
22. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...engine.onCreateSurface
23. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...engine.onSurfaceCreated
24. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...engine.onSurfaceChanged
25. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.oncVisChanged
26. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.onPause
27. : service.pause
28. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...engine.oncVisChanged
29. : com.kurloo.service.AlphaService$AlphaEngine@46033ea0...engine.onResume
30. : service.onresume
31. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.onSurfaceDestroyed
32. : onLoadedToHardware (Texture is loaded to hardware,it would be blank.)
33. : com.kurloo.service.AlphaService$AlphaEngine@46035e28...engine.onDestroy
34.  

Parsed in 0.040 seconds, using GeSHi 1.0.8.4

you need to change your resources on the main thread.

[yeah00]

The tutorials by mimito thread(Tutorials section...) has a link to another thread with some example code that works fine.

[jgibbs]

I've just been trying to solve the same problem with a wallpaper I'm putting together. The solution in my case is as follows:

Add a global variable to the wallpaper servlce

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Using java Syntax Highlighting

1. public class LiveWallpaperService extends BaseLiveWallpaperService implements SharedPreferences.OnSharedPreferenceChangeListener {
2.         private boolean mSettingsChanged = false;
3.         ...
4. }
5.  

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

Make a function that builds the scene from scratch

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Using java Syntax Highlighting

1. public void BuildScene(Scene scene) {
2.         // Destroy the current scene
3.         scene.detachChildren();
4.        
5.         // Create the scene with currentsettings
6.         ...
7. }      
8.  

Parsed in 0.035 seconds, using GeSHi 1.0.8.4

Catch preference changes and set global flag to indicate new settings need to come into play

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Using java Syntax Highlighting

1. public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
2.         nMySetting = Integer.parseInt(prefs.getString("num_setting", "3"));
3.         mSettingsChanged = true;
4. }
5.  

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

Call BuildScene from load and resume functions as applicable

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Using java Syntax Highlighting

1. @Override
2. public Scene onLoadScene() {
3.         final Scene scene = new Scene();
4.         BuildScene(scene);
5.         return scene;
6. }
7.  
8. @Override
9. public void onResume() {
10.         super.onResume();
11.         if( mSettingsChanged )
12.         {
13.                 BuildScene( this.getEngine().getScene() );
14.                 mSettingsChanged = false;
15.         }
16. }
17.  

Parsed in 0.037 seconds, using GeSHi 1.0.8.4