Экранное включение/выключение широковещательного прослушивателя для виджета на Android Oreo

Ответ 1

Вот что я делаю для прослушивания SCREEN_OFF и SCREEN_ON, транслируемых в Android API 26 (Oreo) и выше. Этот ответ не связан с виджетами, но может быть полезно найти некоторую часть рабочего процесса.

Я использую Планировщик заданий для реестров и реселлеров UnRegister Broadcast, которые прослушивают действия SCREEN_OFF и SCREEN_ON.

import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.PowerManager;
import android.support.annotation.NonNull;
import android.util.Log;

import com.evernote.android.job.Job;
import com.evernote.android.job.JobManager;
import com.evernote.android.job.JobRequest;

import java.util.concurrent.TimeUnit;


public class LockScreenJob extends Job {

    private static final String TAG = LockScreenJob.class.getSimpleName();

    public static final String TAG_P = "periodic_job_tag";
    public static final String TAG_I = "immediate_job_tag";

    //Used static refrence of broadcast receiver for ensuring if it already register or not NULL
    // then first unregister it and set to null before registering it again.
    public static UnlockReceiver aks_Receiver = null;

    @Override
    @NonNull
    protected Result onRunJob(Params params) {
        // run your job here

        String jobTag = params.getTag();

        if (BuildConfig.DEBUG) {
            Log.i(TAG, "Job started! " + jobTag);
        }

        PowerManager pm = (PowerManager) getContext().getSystemService(Context.POWER_SERVICE);

        boolean isInteractive = false;
        // Here we check current status of device screen, If it Interactive then device screen is ON.
        if (Build.VERSION.SDK_INT >= 20) {
            isInteractive = pm.isInteractive();
        } else {
            isInteractive = pm.isScreenOn();
        }

        try {
            if (aks_Receiver != null) {
                getContext().getApplicationContext().unregisterReceiver(aks_Receiver); //Use 'Application Context'.
            }
        } catch (Exception e) {
            if (BuildConfig.DEBUG) {
                e.printStackTrace();
            }
        } finally {
            aks_Receiver = null;
        }

        try {
            //Register receiver for listen "SCREEN_OFF" and "SCREEN_ON" action.

            IntentFilter filter = new IntentFilter("android.intent.action.SCREEN_OFF");
            filter.addAction("android.intent.action.SCREEN_ON");
            aks_Receiver = new UnlockReceiver();
            getContext().getApplicationContext().registerReceiver(aks_Receiver, filter); //use 'Application context' for listen brodcast in background while app is not running, otherwise it may throw an exception.
        } catch (Exception e) {
            if (BuildConfig.DEBUG) {
                e.printStackTrace();
            }
        }

        if (isInteractive)
        {
          //TODO:: Can perform required action based on current status of screen.
        }

        return Result.SUCCESS;
    }

    /**
     * scheduleJobPeriodic: Added a periodic Job scheduler which run on every 15 minute and register receiver if it unregister. So by this hack broadcast receiver registered for almost every time w.o. running any foreground/ background service. 
     * @return
     */
    public static int scheduleJobPeriodic() {
        int jobId = new JobRequest.Builder(TAG_P)
                .setPeriodic(TimeUnit.MINUTES.toMillis(15), TimeUnit.MINUTES.toMillis(5))
                .setRequiredNetworkType(JobRequest.NetworkType.ANY)
                .build()
                .schedule();

        return jobId;
    }

    /**
     * runJobImmediately: run job scheduler immediately so that broadcasr receiver also register immediately
     * @return
     */
    public static int runJobImmediately() {
        int jobId = new JobRequest.Builder(TAG_I)
                .startNow()
                .build()
                .schedule();

        return jobId;
    }

    /**
     * cancelJob: used for cancel any running job by their jobId.
     * @param jobId
     */
    public static void cancelJob(int jobId) {
        JobManager.instance().cancel(jobId);
    }
}

И мой класс JobCrator LockScreenJobCreator:

import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

import com.evernote.android.job.Job;
import com.evernote.android.job.JobCreator;

public class LockScreenJobCreator implements JobCreator {

    @Override
    @Nullable
    public Job create(@NonNull String tag) {
        switch (tag) {
            case LockScreenJob.TAG_I:
                return new LockScreenJob();
            case LockScreenJob.TAG_P:
                return new LockScreenJob();
            default:
                return null;
        }
    }
}

Класс BroadcastReceiver UnlockReceiver:

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class UnlockReceiver extends BroadcastReceiver {

    private static final String TAG = UnlockReceiver.class.getSimpleName();

    @Override
    public void onReceive(Context appContext, Intent intent) {

        if (BuildConfig.DEBUG) {
            Log.i(TAG, "onReceive: " + intent.getAction());
        }

        if (intent.getAction().equalsIgnoreCase(Intent.ACTION_SCREEN_OFF))
        {
          //TODO:: perform action for SCREEN_OFF
        } else if (intent.getAction().equalsIgnoreCase(Intent.ACTION_SCREEN_ON)) {
          //TODO:: perform action for SCREEN_ON
        }
    }

}

И добавление класса JobCreator в класс Application следующим образом:

public class AksApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

       JobManager.create(this).addJobCreator(new LockScreenJobCreator());   

       //TODO: remaing code
    }

}

Не забудьте определить класс приложения в вашем AndroidManifest.xml

После этого я запускаю Job scheduler из моей Activity следующим образом:

import android.support.v7.app.AppCompatActivity;

public class LockScreenActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        runJobScheduler();

        //TODO: other code
    }

    @Override
    protected void onStop() {
      super.onStop();

      cancelImmediateJobScheduler();

      //TODO: other code
    }

    /**
     * runJobScheduler(): start immidiate job scheduler and pending job schedulaer from 
       your main Activity.
     */
    private void runJobScheduler() {
        Set<JobRequest> jobSets_I = null, jobSets_P = null;
        try {
            jobSets_I = JobManager.instance().getAllJobRequestsForTag(LockScreenJob.TAG_I);
            jobSets_P = JobManager.instance().getAllJobRequestsForTag(LockScreenJob.TAG_P);

            if (jobSets_I == null || jobSets_I.isEmpty()) {
                LockScreenJob.runJobImmediately();
            }
            if (jobSets_P == null || jobSets_P.isEmpty()) {
                LockScreenJob.scheduleJobPeriodic();
            }

            //Cancel pending job scheduler if mutiple instance are running.
            if (jobSets_P != null && jobSets_P.size() > 2) {
                JobManager.instance().cancelAllForTag(LockScreenJob.TAG_P);
            }
        } catch (Exception e) {
            if (Global_Var.isdebug) {
                e.printStackTrace();
            }
        } finally {
            if (jobSets_I != null) {
                jobSets_I.clear();
            }
            if (jobSets_P != null) {
                jobSets_P.clear();
            }
            jobSets_I = jobSets_P = null;
        }
    }


    /**
     * cancelImmediateJobScheduler: cancel all instance of running job scheduler by their 
      TAG name. 
     */
    private void cancelImmediateJobScheduler() {  
            JobManager.instance().cancelAllForTag(LockScreenJob.TAG_I);
    }
}

Запустив Job Scheduler, я могу прослушивать действия SCREEN_OFF и SCREEN_ON без использования каких-либо функций переднего плана или фона. Я тестировал выше код API 26+, и он работает нормально.