我已经有一个应用程序已经widget
已经有一个service
它每5秒更新一次该小部件。AlarmManager生命周期和取消错误
这里是我的AppWidgetProvider
:
public class MyWidget extends AppWidgetProvider {
PendingIntent service = null;
AlarmManager alarmManager;
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
final Intent i = new Intent(context, MyService.class);
if(service == null) {
service = PendingIntent.getService(context, 0, i, PendingIntent.FLAG_CANCEL_CURRENT);
}
alarmManager.setRepeating(AlarmManager.RTC, SystemClock.elapsedRealtime(), 1000*5, service);
}
@Override
public void onDisabled(Context context) {
Log.d("LogTag", "onDisabled");
alarmManager.cancel(service);
service.cancel();
}
}
而且我Service
:
public class MyService extends Service {
int b = 5;
@Override
public void onCreate() { super.onCreate(); }
public int onStartCommand(Intent intent, int flags, int startId) {
this.buildUpdate();
return 0;
}
private void buildUpdate() {
Log.d("AAA", "Update is coming");
RemoteViews rmViews = new RemoteViews(getPackageName(), R.layout.widget_layout);
rmViews.setTextViewText(R.id.hello, "Iterator: " + Integer.toString(b));
ComponentName thisWidget = new ComponentName(this, MyWidget.class);
AppWidgetManager manager = AppWidgetManager.getInstance(this);
manager.updateAppWidget(thisWidget, rmViews);
b++;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
Service
和其他一切都很好。但我仍一直对所有这些东西对夫妇的问题:
什么是对
SystemClock.elapsedRealtime()
这是setRepeating
方法的参数?它指出什么时候开始?当我尝试删除小部件时,出现了一些错误(在下面),不幸的是
AlarmManager
仍然无法取消。我错过了什么?在小部件初始化(或调用)之前,我需要做一些网络操作。 Widget应该有一些来自服务器的数据。我应该使用
AsyncTask
还是什么?
当我尝试删除小工具,越来越:
03-04 23:39:51.428: E/AndroidRuntime(5646): Uncaught handler: thread main exiting due to uncaught exception
03-04 23:39:51.438: E/AndroidRuntime(5646): java.lang.RuntimeException: Unable to start receiver com.example.widget.MyWidget: java.lang.NullPointerException
03-04 23:39:51.438: E/AndroidRuntime(5646): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2646)
03-04 23:39:51.438: E/AndroidRuntime(5646): at android.app.ActivityThread.access$3100(ActivityThread.java:119)
03-04 23:39:51.438: E/AndroidRuntime(5646): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1913)
03-04 23:39:51.438: E/AndroidRuntime(5646): at android.os.Handler.dispatchMessage(Handler.java:99)
03-04 23:39:51.438: E/AndroidRuntime(5646): at android.os.Looper.loop(Looper.java:123)
03-04 23:39:51.438: E/AndroidRuntime(5646): at android.app.ActivityThread.main(ActivityThread.java:4363)
03-04 23:39:51.438: E/AndroidRuntime(5646): at java.lang.reflect.Method.invokeNative(Native Method)
03-04 23:39:51.438: E/AndroidRuntime(5646): at java.lang.reflect.Method.invoke(Method.java:521)
03-04 23:39:51.438: E/AndroidRuntime(5646): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-04 23:39:51.438: E/AndroidRuntime(5646): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-04 23:39:51.438: E/AndroidRuntime(5646): at dalvik.system.NativeStart.main(Native Method)
03-04 23:39:51.438: E/AndroidRuntime(5646): Caused by: java.lang.NullPointerException
03-04 23:39:51.438: E/AndroidRuntime(5646): at com.example.widget.MyWidget(MyWidget.java:33)
03-04 23:39:51.438: E/AndroidRuntime(5646): at android.appwidget.AppWidgetProvider.onReceive(AppWidgetProvider.java:76)
03-04 23:39:51.438: E/AndroidRuntime(5646): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2637)
03-04 23:39:51.438: E/AndroidRuntime(5646): ... 10 more
谢谢。没有尝试AsyncTask,但得到了一些线索。 – 2012-03-05 00:02:29