Question

我试图创建一个定期更新的小部件，就像时钟小部件一样。窗口小部件无异常地加载和运行，但它没有明显的原因停止更新UI。当我将它连接到调试器时，没有抛出异常。而且没有任何模式。它随机停止。当它失去焦点时，它不会死亡（移动到不同的屏幕或新的应用程序出现）。小部件将在可见屏幕上运行，手机处于唤醒状态，并且只是停止更新。

我的猜测是操作系统正在进行清理并在需要资源时终止进程。有没有告诉操作系统保持我的进程活着？

private PendingIntent createUpdateIntent(Context context) {
    Intent intent = new Intent(CLOCK_WIDGET_UPDATE);
    return PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    super.onUpdate(context, appWidgetManager, appWidgetIds);
    context.startService(new Intent(context, UpdateService.class));
}

@Override
public void onEnabled(Context context) {
    // Enter relevant functionality for when the first widget is created
    super.onEnabled(context);
    AlarmManager alarmManager = (AlarmManager)  context.getSystemService(context.ALARM_SERVICE);
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.add(Calendar.SECOND, 1);
    alarmManager.setRepeating(alarmManager.RTC, calendar.getTimeInMillis(), 1000, createUpdateIntent(context));
}

@Override
public void onDisabled(Context context) {
    // Enter relevant functionality for when the last widget is disabled
    super.onDisabled(context);
    AlarmManager alarmManager = (AlarmManager)  context.getSystemService(context.ALARM_SERVICE);
    alarmManager.cancel(createUpdateIntent(context));
}

@Override
public void onReceive(Context context, Intent intent) {
    super.onReceive(context, intent);

    if (CLOCK_WIDGET_UPDATE.equals(intent.getAction())) {
        context.startService(new Intent(context, UpdateService.class));
    }
}


public static class UpdateService extends Service {

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
    @Override
    public void onStart(Intent intent, int startID) {
        RemoteViews updateViews = buildUpdate(this);
        ComponentName widget = new ComponentName(this, MainWidget.class);
        AppWidgetManager manager = AppWidgetManager.getInstance(this);
        manager.updateAppWidget(widget, updateViews);
    }

    private RemoteViews buildUpdate(Context context) {
        RemoteViews updateViews = new RemoteViews(context.getPackageName(), R.layout.main_widget);
        if (!EventStart.equals("")) {

            DateTimeFormatter fmt = DateTimeFormat.forPattern("M/d/yyyy h:mm a");
            endDate = fmt.parseDateTime(EventStart);

            Calendar cal = Calendar.getInstance();
            TimeZone UTC = TimeZone.getTimeZone("UTC");
            cal.setTimeZone(UTC);
            Date beginDate = cal.getTime();

            Date dateEnd = endDate.toDate();

            Map<TimeUnit,Long> result = computeDiff(
                    beginDate,
                    dateEnd
            );

            String Seconds = String.valueOf(result.get(TimeUnit.SECONDS));

            if (result.get(TimeUnit.DAYS) <= 0 && result.get(TimeUnit.HOURS) <= 0 && result.get(TimeUnit.MINUTES) <= 0     && result.get(TimeUnit.SECONDS) <= 0) {

                if (doVibrate) {
                    Vibrator v = (Vibrator) this.getSystemService(Context.VIBRATOR_SERVICE);
                    v.vibrate(1000);
                }

                Intent intent = new Intent(CLOCK_WIDGET_UPDATE);
                AlarmManager alarmManager = (AlarmManager)  context.getSystemService(context.ALARM_SERVICE);
                alarmManager.cancel(PendingIntent.getBroadcast(context, 0, intent,     PendingIntent.FLAG_UPDATE_CURRENT));

            }
        }

        updateViews.setTextViewText(R.id.info, Seconds);
        return updateViews;
    }
}

时钟小工具停止更新

0 个答案: