Android JobService 在低电量模式下的行为策略与通知持久性

public class TelaPrincipal extends AppCompatActivity {

    private static final String TAG = "TelaPrincipal";
    private static final int JOB_ID = 123;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tela_principal);

        // 在应用启动时尝试调度Job
        startarJob();
    }

    // 取消已调度的Job
    public void cancelarJob(){
        JobScheduler scheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
        if (scheduler != null) {
            scheduler.cancel(JOB_ID);
            Log.d(TAG, "Job cancelled with ID: " + JOB_ID);
        }
    }

    // 启动或重新调度Job
    public void startarJob(){
        ComponentName componentName = new ComponentName(this, ExampleJobService.class);
        JobInfo info = new JobInfo.Builder(JOB_ID, componentName)
                .setRequiresCharging(false) // 不需要充电
                .setRequiredNetworkType(JobInfo.NETWORK_TYPE_UNMETERED) // 需要非计量网络
                .setPersisted(true) // 设备重启后保留
                .setPeriodic(15 * 60 * 1000) // 每15分钟执行一次
                .build();

        JobScheduler scheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
        if (scheduler != null) {
            int resultCode = scheduler.schedule(info);
            if (resultCode == JobScheduler.RESULT_SUCCESS) {
                Log.d(TAG, "Job scheduled successfully with ID: " + JOB_ID);
            } else {
                Log.d(TAG, "Job scheduling failed with ID: " + JOB_ID);
            }
        }
    }
}

// ExampleJobService.java (示例JobService实现)
public class ExampleJobService extends JobService {
    private static final String TAG = "ExampleJobService";

    @Override
    public boolean onStartJob(JobParameters params) {
        Log.d(TAG, "Job started: " + params.getJobId());
        // 在这里执行你的后台任务
        // 注意：此方法在主线程执行，耗时操作应放入单独线程或AsyncTask
        jobFinished(params, false); // 任务完成，不需要重试
        return true; // 表示有工作正在进行
    }

    @Override
    public boolean onStopJob(JobParameters params) {
        Log.d(TAG, "Job stopped: " + params.getJobId());
        // 当系统决定停止Job时调用，例如：约束条件不再满足或电量过低
        return false; // 如果希望系统在条件满足时重新调度此Job，返回true
    }
}

// 在你的应用中发布通知
public void postPersistentNotification(Context context, String title, String content) {
    NotificationManager notificationManager = (NotificationManager) 
            context.getSystemService(Context.NOTIFICATION_SERVICE);

    // 为Android O及更高版本创建通知渠道
    String channelId = "my_app_channel_id";
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel(
                channelId, 
                "My App Notifications", 
                NotificationManager.IMPORTANCE_DEFAULT);
        notificationManager.createNotificationChannel(channel);
    }

    NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId)
            .setSmallIcon(R.drawable.ic_notification) // 设置小图标
            .setContentTitle(title) // 设置标题
            .setContentText(content) // 设置内容
            .setPriority(NotificationCompat.PRIORITY_DEFAULT) // 设置优先级
            .setAutoCancel(false) // 用户点击后不自动取消
            .setOngoing(true); // 使通知成为“持续性通知”，用户不能滑动清除

    notificationManager.notify(NOTIFICATION_ID, builder.build());
}