问题描述
时间。 Java的方式工作，但服务的方式没有。
Based on this tutorial i created a widget that should show the time. The java way works, but the service way doesn't.
HelloWidget.java：
HelloWidget.java:
public class HelloWidget extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
Intent intent = new Intent(context, UpdateService.class);
context.startService(intent);
}
UpdateService.java：
UpdateService.java:
public final class UpdateService extends Service {
@Override
public void onStart(Intent intent, int startId) {
RemoteViews updateViews = new RemoteViews(this.getPackageName(), R.layout.main);
Date date = new Date();
java.text.DateFormat format = SimpleDateFormat.getTimeInstance(
SimpleDateFormat.MEDIUM, Locale.getDefault());
updateViews.setTextViewText(R.id.widget_textview, "Current Time " + format.format(date));
ComponentName thisWidget = new ComponentName(this, HelloWidget.class);
AppWidgetManager manager = AppWidgetManager.getInstance(this);
manager.updateAppWidget(thisWidget, updateViews);
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
该hello_widget_provider.xml有该行：机器人：updatePeriodMillis =1000
The hello_widget_provider.xml has this row: android:updatePeriodMillis="1000"
问题：小部件显示当前的时间，但它没有更新（Java的方式是）
Problem: The widget shows the current time but it's not updating (the java-way is).
我的主要目标是更新部件在如每天18:56。IDK如果这是很好的方式，但我试图修改的OnUpdate方法如下图所示，但它与ALARM_SERVICE一个问题：ALARM_SERVICE不能被解析为一个变量
My main goal is to update the widget at e.g. 18:56 every day.Idk if this is the good way, but i tried to modify the onUpdate method like below, but it has a problem with ALARM_SERVICE: ALARM_SERVICE cannot be resolved to a variable
public class HelloWidget extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
AlarmManager alarmManager;
Intent intent = new Intent(context, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0,
intent, PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 18);
cal.set(Calendar.MINUTE, 56);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 86400, pendingIntent);
}}
任何帮助是AP preciated。
Any help is appreciated.
推荐答案
回首的时候，我问这个问题使我意识到我在过去的1,5年来有多少教训。
Looking back the time I asked this question makes me realize how much I learned in the past 1,5 years.
由于我刚才一直在与一个部件，在过去两个星期，我刚刚发现我的这个悬而未决的问题，我决定来解决它。我希望它可以帮助别人。
Since I have just been working with a widget in the last two weeks and I have just found this unanswered question of mine I decided to solve it. I hope it helps others.
在AppWidgetProvider应该是这样的：
The AppWidgetProvider should look like this:
public class MyWidget extends AppWidgetProvider {
public static String ACTION_WIDGET_CONFIGURE = "ConfigureWidget";
public static String ACTION_WIDGET_RECEIVER = "ActionReceiverWidget";
private PendingIntent service = null;
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
final AlarmManager m = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
final Calendar TIME = Calendar.getInstance();
TIME.set(Calendar.MINUTE, 0);
TIME.set(Calendar.SECOND, 0);
TIME.set(Calendar.MILLISECOND, 0);
final Intent i = new Intent(context, MyService.class);
if (service == null)
{
service = PendingIntent.getService(context, 0, i, PendingIntent.FLAG_CANCEL_CURRENT);
}
m.setRepeating(AlarmManager.RTC, TIME.getTime().getTime(), 1000 * 1, service);
}
@Override
public void onDeleted(Context context, int[] appWidgetIds) {
super.onDeleted(context, appWidgetIds);
}
@Override
public void onDisabled(Context context) {
super.onDisabled(context);
final AlarmManager m = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
if (service != null)
{
m.cancel(service);
}
}
@Override
public void onEnabled(Context context) {
super.onEnabled(context);
}
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
}
}
该服务：
public class MyService extends Service
{
@Override
public void onCreate()
{
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
buildUpdate();
return super.onStartCommand(intent, flags, startId);
}
private void buildUpdate()
{
String lastUpdated = DateFormat.format("hh:mm:ss", new Date()).toString();
RemoteViews view = new RemoteViews(getPackageName(), R.layout.widget_layout);
view.setTextViewText(R.id.btn_widget, lastUpdated);
ComponentName thisWidget = new ComponentName(this, MyWidget.class);
AppWidgetManager manager = AppWidgetManager.getInstance(this);
manager.updateAppWidget(thisWidget, view);
}
@Override
public IBinder onBind(Intent intent)
{
return null;
}
}
此外，注册商，并在清单中的服务：
Also, register the provider and the Service in the Manifest:
<receiver android:name="MyWidget" android:label="Tutorial_Widget 1x1">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
<action android:name="com.something.MyWidget.ACTION_WIDGET_RECEIVER"/>
</intent-filter>
<meta-data android:name="android.appwidget.provider" android:resource="@xml/widget_info"/>
</receiver>
<service android:enabled="true" android:name=".MyService" />
这篇关于Android的小窗口更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！