我正在创建一个应用小部件,需要在应用数据库发生更改时进行更新。 我的做法: 1. 创建工作中的小部件 2. 覆盖onReceive方法:
public static final String DATABASE_CHANGED = " utimetable.DATABASE_CHANGED";
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (action.equals(DATABASE_CHANGED) || action.equals(Intent.ACTION_DATE_CHANGED))
{
AppWidgetManager gm = AppWidgetManager.getInstance(context);
int[] ids = gm.getAppWidgetIds(new ComponentName(context, widget_provider.class));
this.onUpdate(context, gm, ids);
}
else
{
super.onReceive(context, intent);
}
}
In AndroidManifest:
<receiver android:name=".widget_provider" android:label="@string/widget_today_name"> <intent-filter> <action android:name="android.appwidget.action.APPWIDGET_UPDATE" /> <action android:name="utimetable.DATABASE_CHANGED" /> <action android:name="android.intent.action.DATE_CHANGED" /> </intent-filter> <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget_row" /> </receiver>
Add Broadcast sending into all DB changing functions:
public static void sendUpdateIntent(Context context) { Intent i = new Intent(context, widget_provider.class); i.setAction(widget_provider.DATABASE_CHANGED); context.sendBroadcast(i); }
但是,当我在数据库中进行更改时,小部件仍未更新。我该怎么办?