使用 Android JobScheduler 安排需要网络访问的任务

Question

在我的 android 应用程序中，我想在网络连接时每天更新外币汇率 there.I 只想每天更新一次货币汇率并在下一个 days.Recently 我听说 android 工作 scheduler.Is 对我的问题有用吗？如果是这样，我如何使用它来更新每天的汇率？请帮助 me.Also 在棒棒糖以下的 android 版本中做什么？

Answer 1

此方法每天在 15:30 启动 alaram manger。在您的 mainActivity 中添加：

private void setNotifyAlarm() {
        long _alarm;
        AlarmManager al;
        PendingIntent fintent;
        Intent notif;

        Calendar now = Calendar.getInstance();
        Calendar wakeupcall = Calendar.getInstance();
        wakeupcall.setTimeInMillis(System.currentTimeMillis());
        wakeupcall.set(Calendar.HOUR_OF_DAY, 15);
        wakeupcall.set(Calendar.MINUTE, 30);

        if (wakeupcall.getTimeInMillis() <= now.getTimeInMillis())
            _alarm=wakeupcall.getTimeInMillis() + (AlarmManager.INTERVAL_DAY+1);
        else
            _alarm=wakeupcall.getTimeInMillis();


        al = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        notif= new Intent(this,TestNotifyService.class);
        fintent = PendingIntent.getService(this,0,notif,0);

        if (SDK_INT < Build.VERSION_CODES.KITKAT) {
            al.set(AlarmManager.RTC_WAKEUP,_alarm, fintent);
            Log.d("lowerMN","hahah");
        }
        else if (Build.VERSION_CODES.KITKAT <= SDK_INT  && SDK_INT < Build.VERSION_CODES.M) {
            al.setExact(AlarmManager.RTC_WAKEUP,_alarm,fintent);
            Log.d("kitkatMN","hahah");
        }
        else if (SDK_INT >= Build.VERSION_CODES.M) {
            al.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,_alarm,fintent);
            Log.d("marshmallowMN","hahah");
        }

    }

现在，在 TestNotifyService.java class 实际做你的工作，

public class TestNotifyService extends IntentService {

    PowerManager powerManager;
    PowerManager.WakeLock wakeLock=null;
    private AlarmManager al;
    PendingIntent fintent;
    Intent notif;
    final int SDK_INT = Build.VERSION.SDK_INT;
    long _alarm;

    public TestNotifyService() {
        super("");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        powerManager = (PowerManager) getSystemService(POWER_SERVICE);
        wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "TRYNOTIFY");
        wakeLock.acquire();
        fetchingDATA();
    }

    private void fetchingDATA() {
        try {

            ........CALL WEBSERVICE TO GET LATEST DATA.......

        } catch (Exception e) {
        }
        reSETNOTIFY();
        wakeLock.release();
    }

    private void reSETNOTIFY() {

        Calendar now = Calendar.getInstance();
        Calendar wakeupcall = Calendar.getInstance();
        wakeupcall.setTimeInMillis(System.currentTimeMillis());
        wakeupcall.set(Calendar.HOUR_OF_DAY, 15);
        wakeupcall.set(Calendar.MINUTE, 30);

        if (wakeupcall.getTimeInMillis() <= now.getTimeInMillis())
            _alarm=wakeupcall.getTimeInMillis() + (AlarmManager.INTERVAL_DAY+1)+25000;
        else
            _alarm=wakeupcall.getTimeInMillis()+25000;

        al = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        notif= new Intent(this,TestNotifyService.class);
        fintent = PendingIntent.getService(this,0,notif,0);

        if (SDK_INT < Build.VERSION_CODES.KITKAT) {
            al.set(AlarmManager.RTC_WAKEUP,_alarm, fintent);
            Log.d("lowerNS","hahah");
        }
        else if (Build.VERSION_CODES.KITKAT <= SDK_INT  && SDK_INT < Build.VERSION_CODES.M) {
            al.setExact(AlarmManager.RTC_WAKEUP,_alarm,fintent);
            Log.d("kitkatNS","hahah");
        }
        else if (SDK_INT >= Build.VERSION_CODES.M) {
            al.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,_alarm,fintent);
            Log.d("marshmallowNS","hahah");
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }
}

现在，当设备重新启动时，您需要使用 Brodcast Receiver 重置警报：

public class Nauto extends BroadcastReceiver {
    final int SDK_INT = Build.VERSION.SDK_INT;

    public Nauto() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        long _Nalarm;
        Log.d("Bootcompleted","starting");
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")){

            AlarmManager alarmMgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
            Intent intent1 = new Intent(context, TestNotifyService.class);
            PendingIntent alarmIntent = PendingIntent.getService(context, 0, intent1, 0);

            Calendar now = Calendar.getInstance();
            Calendar wakeupcall = Calendar.getInstance();
            wakeupcall.setTimeInMillis(System.currentTimeMillis());
            wakeupcall.set(Calendar.HOUR_OF_DAY, 15);
            wakeupcall.set(Calendar.MINUTE, 30);

            if (wakeupcall.getTimeInMillis() <= now.getTimeInMillis())
                _Nalarm=wakeupcall.getTimeInMillis() + (AlarmManager.INTERVAL_DAY+1);
            else
                _Nalarm=wakeupcall.getTimeInMillis();

            if (SDK_INT < Build.VERSION_CODES.KITKAT) {
                alarmMgr.set(AlarmManager.RTC_WAKEUP,_Nalarm, alarmIntent);
                Log.d("lowerNB","hahah");
            }
            else if (Build.VERSION_CODES.KITKAT <= SDK_INT  && SDK_INT < Build.VERSION_CODES.M) {
                alarmMgr.setExact(AlarmManager.RTC_WAKEUP,_Nalarm,alarmIntent);
                Log.d("kitkatNB","hahah");
            }
            else if (SDK_INT >= Build.VERSION_CODES.M) {
                alarmMgr.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,_Nalarm,alarmIntent);
                Log.d("marshmallowNB","hahah");
            }

        }

    }
}

最后，在 Manifest 文件中添加：

<receiver android:name=".Nauto" android:exported="true" android:enabled="true">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>

<service android:name=".TestNotifyService" android:exported="true" android:enabled="true"/>

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
    <uses-permission android:name="android.permission.WAKE_LOCK"/>

让我知道它是否有效。

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