設置更改後更新動態壁紙

我正在用andengine創建動態壁紙。我的項目有兩個類設置更改後更新動態壁紙

public class LiveWallpaperMain extends BaseLiveWallpaperService implements SharedPreferences.OnSharedPreferenceChangeListener 
{ 

//Other methods 

    public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback) 
      throws Exception { 
     // TODO Auto-generated method stub 
     this.mEngine.registerUpdateHandler(new FPSLogger()); 
     scene = new Scene(); 


     if(snowDensity == 5) 
      snowDensityValue = 50; 
     else if(snowDensity == 10) 
      snowDensityValue = 200; 
     else 
      snowDensityValue = 500; 
     particleSystem = new BatchedPseudoSpriteParticleSystem(
       new RectangleParticleEmitter(CAMERA_WIDTH/2, 0, CAMERA_WIDTH, CAMERA_HEIGHT), 
       2, 5, snowDensityValue, mSnowParticleRegion, vbom); 
     particleSystem.setBlendFunction(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE); 
     particleSystem.addParticleInitializer(new VelocityParticleInitializer<Entity>(-3, 3, 20, 40)); 
     particleSystem.addParticleInitializer(new AccelerationParticleInitializer<Entity>(-3, 3, 3, 5)); 
     particleSystem.addParticleInitializer(new RotationParticleInitializer<Entity>(0.0f, 360.0f)); 
     particleSystem.addParticleInitializer(new org.andengine.entity.particle.modifier.ExpireParticleInitializer<Entity>(15f)); 
     particleSystem.addParticleInitializer(new ScaleParticleInitializer<Entity>(0.5f, 0.9f)); 
     particleSystem.addParticleInitializer(new RegisterXSwingEntityModifierInitializer<Entity>(15f, 0f, (float) Math.PI * 8, 3f, 25f, true)); 

     particleSystem.addParticleModifier(new AlphaParticleModifier<Entity>(10f, 15f, 1.0f, 0.0f)); 
    Log.e("LiveWallpaperSettings", "Density " + snowDensityValue); 



    pOnCreateSceneCallback.onCreateSceneFinished(scene); 
}

}

這是設置類

public class LiveWallpaperSettings extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener 
{ 
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) 
    { 
     SharedPreferences customSharedPreference = getSharedPreferences(key, MODE_PRIVATE); 
     SharedPreferences.Editor editor = customSharedPreference.edit(); 
     editor.putString("Speed",listPreference.getValue()); 
     editor.commit(); 
     Log.e("LiveWallpaperSettings", "currvalue " + listPreference.getValue()); 
     currValue = listPreference.getValue(); 
    } 
}

我想，當它在設置被改變以改變雪密度。當我更改設置時，它會在共享首選項中發生變化，但是如何將粒子系統刷新到變化會立即反映出來？

來源

2013-11-28 rajender sohi

爲粒子效果製作方法，並在來自該屏幕時立即調用此方法。 – Rama

代碼示例會更有幫助。 –

首先，您不需要在LiveWallpaperSettings類中實現OnSharedPreferenceChangeListener。如果您在xml文件中正確定義了首選項鍵，則值將自動存儲。你的班級應該是這樣的：

public class LiveWallpaperSettings extends PreferenceActivity { 

    @Override 
    protected void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 
     getPreferenceManager().setSharedPreferencesName("shared-preference-file-name"); 
     addPreferencesFromResource(R.xml.settings); // this is xml with PreferenceScreen element 
    } 
}

在你的LiveWallpaperMain類中實現OnSharedPreferenceChangeListener。實現應該如下所示：

public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { 
     if ("snow-density-key-name-from-xml".equals(key)) { 
      // here call the method to update snow density 
     } 
    }

來源

2013-11-29 21:46:16

我在我的Main類中有onSharedPreferenceChanged（....）方法，但它永遠不會被調用。每當我改變一些東西時，設置類的onSharedPreferenceChanged方法被調用。任何想法爲什麼？ –

當然。您可能尚未將LiveWallpaperMain註冊爲onSharedPreferenceChanged偵聽器。確保通過調用：context.getSharedPreferences（「shared-preference-file-name」，Context.MODE_PRIVATE）.registerOnSharedPreferenceChangeListener（liveWallpaperMainObject）註冊它; –

是的，這是問題，現在就解決了。感謝大家的幫助。 –

設置更改後更新動態壁紙

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