android清除数据后widget无法更新问题修改

浏览数：25 / 时间：2015年06月11日

清除数据时会发送ACTION_PACKAGE_DATA_CLEARED广播，在widgetProvider里面监听该广播并进行处理就可以了

[java]?view plaincopy?
public?static?class?PackageDataClearedReceiver?extends?BroadcastReceiver?{??
???????private?static?final?String?ACTION_PACKAGE_DATA_CLEARED?=?"com.mediatek.intent.action.SETTINGS_PACKAGE_DATA_CLEARED";??
??
???????public?void?onReceive(Context?context,?Intent?intent)?{??
???????????if?(!ACTION_PACKAGE_DATA_CLEARED.equals(intent.getAction()))?{??
???????????????return;??
???????????}??
???????????String?pkgName?=?intent.getStringExtra("packageName");??
???????????MusicLogUtils.v(TAG,?"PackageDataClearedReceiver?recevied?pkgName?=?"?+?pkgName);??
???????????if?(pkgName?!=?null?&&?pkgName.equals(context.getPackageName()))?{??
???????????????MediaAppWidgetProvider?mediaAppWidgetProvider?=?MediaAppWidgetProvider??
???????????????????????.getInstance();??
???????????????if?(mediaAppWidgetProvider?==?null)?{??
???????????????????MusicLogUtils.v(TAG,?"mediaAppWidgetProvider?is?null?");??
???????????????????return;??
???????????????}??
???????????????mediaAppWidgetProvider.defaultAppWidget(context,?null);??
???????????}??
???????}??
??
???}??

defaultAppWidget()函数会重新加载widget信息和布局文件，这样就可以恢复默认值了。
最后别忘了在AndroidManefest.xml里面加上：

[html]?view plaincopy?
<receiver?android:name="com.android.music.MediaAppWidgetProvider$PackageDataClearedReceiver"?>??
????<intent-filter>??
????????<action?android:name="com.mediatek.intent.action.SETTINGS_PACKAGE_DATA_CLEARED"?/>??
????????<category?android:name="android.intent.category.DEFAULT"?/>??
????</intent-filter>??
</receiver>??