android 后台定时任务
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2022-07-14 18:26:12
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以下功能可用JobScheduler、JobService更简单实现。
定义Service:
public class DemoService extends Service {
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
//每隔两分钟定时发送广播 单位为毫秒值 120000=2分钟
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
long triggerTime = SystemClock.elapsedRealtime() + 120000;
Intent i = new Intent(this, DemoReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);
alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerTime, pi);
//doSomething
return super.onStartCommand(intent, flags, startId);
}
}
定义Receiver:
//收到广播即开启服务
public class DemoReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
context.startService(new Intent(context, DemoService.class));
}
}
在需要开始定时任务的时候执行:
startService(new Intent(context, DemoService.class));
注意:在清单文件中注册service、Receiver.
android:exported、android:exported不是必须
BOOT_COMPLETED为开机启动时可以开始定时任务
<receiver android:name="com.demo.service.DemoReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>
<service android:name="com.demo.service.DemoService"
android:enabled="true"
android:exported="true"/>