保活进程唤醒_Android 8.0以上系统应用如何保活

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Python开发点击右侧关注，探讨技术话题！作者丨xiangzhihong来源：https://segmentfault.com/a/1190000020159573最近在做一个埋点的sdk，由于埋点是分批上传的，不是每次都上传，所以会有个进程保活的机制，这也是自研推送的实现技术之一：如何保证Android进程的存活。对于Android来说，保活主要有以下一些方法：

开启前台Service(效果好，推荐)
Service中循环播放一段无声音频(效果较好，但耗电量高，谨慎使用)
双进程守护(Android 5.0前有效)
JobScheduler(Android 5.0后引入，8.0后失效)
1 像素activity保活方案(不推荐)
广播锁屏、自定义锁屏(不推荐)
第三方推送SDK唤醒(效果好，缺点是第三方接入)

下面是具体的实现方案：

1.监听锁屏广播，开启1个像素的Activity

最早见到这种方案的时候是2015年，有个FM的app为了向投资人展示月活，在Android应用中开启一个1像素的Activity。由于Activity的级别是比较高的，所以开启1个像素的Activity的方式就可以保证进程是不容易被杀掉的。具体来说，定义一个1像素的Activity，在该Activity中动态注册自定义的广播。

class OnePixelActivity : AppCompatActivity() {

    private lateinit var br: BroadcastReceiver

    override fun onCreate(savedInstanceState: Bundle?) {        super.onCreate(savedInstanceState)

        val window = window        window.setGravity(Gravity.LEFT or Gravity.TOP)        val params = window.attributes        params.x = 0        params.y = 0        params.height = 1        params.width = 1        window.attributes = params

        br = object : BroadcastReceiver() {            override fun onReceive(context: Context, intent: Intent) {                finish()            }        }        registerReceiver(br, IntentFilter("finish activity"))        checkScreenOn()    }

    override fun onResume() {        super.onResume()        checkScreenOn()    }

    override fun onDestroy() {        try {

            unregisterReceiver(br)        } catch (e: IllegalArgumentException) {        }        super.onDestroy()    }

    private fun checkScreenOn() {        val pm = this@OnePixelActivity.getSystemService(Context.POWER_SERVICE) as PowerManager        val isScreenOn = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {            pm.isInteractive        } else {            pm.isScreenOn        }        if (isScreenOn) {            finish()        }    }}

2，双进程守护

双进程守护，在Android 5.0前是有效的，5.0之后就不行了。首先，我们定义定义一个本地服务，在该服务中播放无声音乐，并绑定远程服务

class LocalService : Service() {    private var mediaPlayer: MediaPlayer? = null    private var mBilder: MyBilder? = null

    override fun onCreate() {        super.onCreate()        if (mBilder == null) {            mBilder = MyBilder()        }    }

    override fun onBind(intent: Intent): IBinder? {        return mBilder    }

    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {

        if (mediaPlayer == null) {            mediaPlayer = MediaPlayer.create(this, R.raw.novioce)

            mediaPlayer?.setVolume(0f, 0f)            mediaPlayer?.isLooping = true            play()        }

        if (KeepLive.foregroundNotification != null) {            val intent2 = Intent(applicationContext, NotificationClickReceiver::class.java)            intent2.action = NotificationClickReceiver.CLICK_NOTIFICATION            val notification = NotificationUtils.createNotification(this, KeepLive.foregroundNotification!!.getTitle(), KeepLive.foregroundNotification!!.getDescription(), KeepLive.foregroundNotification!!.getIconRes(), intent2)            startForeground(13691, notification)        }

        try {            val intent3 = Intent(this, RemoteService::class.java)            this.bindService(intent3, connection, Context.BIND_ABOVE_CLIENT)        } catch (e: Exception) {        }

        try {            if (Build.VERSION.SDK_INT 25) {                startService(Intent(this, HideForegroundService::class.java))            }        } catch (e: Exception) {        }

        if (KeepLive.keepLiveService != null) {            KeepLive.keepLiveService!!.onWorking()        }        return Service.START_STICKY    }

    private fun play() {        if (mediaPlayer != null && !mediaPlayer!!.isPlaying) {            mediaPlayer?.start()        }    }

    private inner class MyBilder : GuardAidl.Stub() {

        @Throws(RemoteException::class)        override fun wakeUp(title: String, discription: String, iconRes: Int) {

        }    }

    private val connection = object : ServiceConnection {

        override fun onServiceDisconnected(name: ComponentName) {            val remoteService = Intent(this@LocalService,                    RemoteService::class.java)            this@LocalService.startService(remoteService)            val intent = Intent(this@LocalService, RemoteService::class.java)            this@LocalService.bindService(intent, this,                    Context.BIND_ABOVE_CLIENT)        }

        override fun onServiceConnected(name: ComponentName, service: IBinder) {            try {                if (mBilder != null && KeepLive.foregroundNotification != null) {                    val guardAidl = GuardAidl.Stub.asInterface(service)                    guardAidl.wakeUp(KeepLive.foregroundNotification?.getTitle(), KeepLive.foregroundNotification?.getDescription(), KeepLive.foregroundNotification!!.getIconRes())                }            } catch (e: RemoteException) {                e.printStackTrace()            }

        }    }

    override fun onDestroy() {        super.onDestroy()        unbindService(connection)        if (KeepLive.keepLiveService != null) {            KeepLive.keepLiveService?.onStop()        }    }}

然后再定义一个远程服务，绑定本地服务。

class RemoteService : Service() {

    private var mBilder: MyBilder? = null

    override fun onCreate() {        super.onCreate()        if (mBilder == null) {            mBilder = MyBilder()        }    }

    override fun onBind(intent: Intent): IBinder? {        return mBilder    }

    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {        try {            this.bindService(Intent(this@RemoteService, LocalService::class.java),connection, Context.BIND_ABOVE_CLIENT)        } catch (e: Exception) {        }        return Service.START_STICKY    }

    override fun onDestroy() {        super.onDestroy()        unbindService(connection)    }

    private inner class MyBilder : GuardAidl.Stub() {        @Throws(RemoteException::class)        override fun wakeUp(title: String, discription: String, iconRes: Int) {            if (Build.VERSION.SDK_INT 25) {                val intent = Intent(applicationContext, NotificationClickReceiver::class.java)                intent.action = NotificationClickReceiver.CLICK_NOTIFICATION                val notification = NotificationUtils.createNotification(this@RemoteService, title, discription, iconRes, intent)                this@RemoteService.startForeground(13691, notification)            }        }    }

    private val connection = object : ServiceConnection {        override fun onServiceDisconnected(name: ComponentName) {            val remoteService = Intent(this@RemoteService,                    LocalService::class.java)            this@RemoteService.startService(remoteService)            this@RemoteService.bindService(Intent(this@RemoteService,                    LocalService::class.java), this, Context.BIND_ABOVE_CLIENT)        }

        override fun onServiceConnected(name: ComponentName, service: IBinder) {}    }

}

class NotificationClickReceiver : BroadcastReceiver() {

    companion object {        const val CLICK_NOTIFICATION = "CLICK_NOTIFICATION"    }

    override fun onReceive(context: Context, intent: Intent) {        if (intent.action == NotificationClickReceiver.CLICK_NOTIFICATION) {            if (KeepLive.foregroundNotification != null) {                if (KeepLive.foregroundNotification!!.getForegroundNotificationClickListener() != null) {                    KeepLive.foregroundNotification!!.getForegroundNotificationClickListener()?.foregroundNotificationClick(context, intent)                }            }        }    }}

3，JobScheduler

JobScheduler是Android从5.0增加的支持一种特殊的任务调度机制，可以用它来实现进程保活，不过在Android8.0系统中，此种方法也失效。首先，我们定义一个JobService，开启本地服务和远程服务。

@SuppressWarnings(value = ["unchecked", "deprecation"])@RequiresApi(Build.VERSION_CODES.LOLLIPOP)class JobHandlerService : JobService() {

    private var mJobScheduler: JobScheduler? = null

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {        var startId = startId        startService(this)        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            mJobScheduler = getSystemService(Context.JOB_SCHEDULER_SERVICE) as JobScheduler            val builder = JobInfo.Builder(startId++,                    ComponentName(packageName, JobHandlerService::class.java.name))            if (Build.VERSION.SDK_INT >= 24) {                builder.setMinimumLatency(JobInfo.DEFAULT_INITIAL_BACKOFF_MILLIS)                 builder.setOverrideDeadline(JobInfo.DEFAULT_INITIAL_BACKOFF_MILLIS)                  builder.setMinimumLatency(JobInfo.DEFAULT_INITIAL_BACKOFF_MILLIS)                builder.setBackoffCriteria(JobInfo.DEFAULT_INITIAL_BACKOFF_MILLIS, JobInfo.BACKOFF_POLICY_LINEAR)            } else {                builder.setPeriodic(JobInfo.DEFAULT_INITIAL_BACKOFF_MILLIS)            }            builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY)            builder.setRequiresCharging(true)             mJobScheduler?.schedule(builder.build())        }        return Service.START_STICKY    }

    private fun startService(context: Context) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {            if (KeepLive.foregroundNotification != null) {                val intent = Intent(applicationContext, NotificationClickReceiver::class.java)                intent.action = NotificationClickReceiver.CLICK_NOTIFICATION                val notification = NotificationUtils.createNotification(this, KeepLive.foregroundNotification!!.getTitle(), KeepLive.foregroundNotification!!.getDescription(), KeepLive.foregroundNotification!!.getIconRes(), intent)                startForeground(13691, notification)            }        }

        val localIntent = Intent(context, LocalService::class.java)

        val guardIntent = Intent(context, RemoteService::class.java)        startService(localIntent)        startService(guardIntent)    }

    override fun onStartJob(jobParameters: JobParameters): Boolean {        if (!isServiceRunning(applicationContext, "com.xiyang51.keeplive.service.LocalService") || !isServiceRunning(applicationContext, "$packageName:remote")) {            startService(this)        }        return false    }

    override fun onStopJob(jobParameters: JobParameters): Boolean {        if (!isServiceRunning(applicationContext, "com.xiyang51.keeplive.service.LocalService") || !isServiceRunning(applicationContext, "$packageName:remote")) {            startService(this)        }        return false    }

    private fun isServiceRunning(ctx: Context, className: String): Boolean {        var isRunning = false        val activityManager = ctx                .getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager        val servicesList = activityManager                .getRunningServices(Integer.MAX_VALUE)        val l = servicesList.iterator()        while (l.hasNext()) {            val si = l.next()            if (className == si.service.className) {                isRunning = true            }        }        return isRunning    }}

4，提高Service优先级

在onStartCommand()方法中开启一个通知，提高进程的优先级。注意：从Android 8.0(API级别26)开始，所有通知必须要分配一个渠道，对于每个渠道，可以单独设置视觉和听觉行为。然后用户可以在设置中修改这些设置，根据应用程序来决定哪些通知可以显示或者隐藏。首先，定义一个通知工具类，此工具栏兼容Android 8.0。

class NotificationUtils(context: Context) : ContextWrapper(context) {

    private var manager: NotificationManager? = null    private var id: String = context.packageName + "51"    private var name: String = context.packageName    private var context: Context = context    private var channel: NotificationChannel? = null

    companion object {        @SuppressLint("StaticFieldLeak")        private var notificationUtils: NotificationUtils? = null

        fun createNotification(context: Context, title: String, content: String, icon: Int, intent: Intent): Notification? {            if (notificationUtils == null) {                notificationUtils = NotificationUtils(context)            }            var notification: Notification? = null            notification = if (Build.VERSION.SDK_INT >= 26) {                notificationUtils?.createNotificationChannel()                notificationUtils?.getChannelNotification(title, content, icon, intent)?.build()            } else {                notificationUtils?.getNotification_25(title, content, icon, intent)?.build()            }            return notification        }    }

    @RequiresApi(api = Build.VERSION_CODES.O)    fun createNotificationChannel() {        if (channel == null) {            channel = NotificationChannel(id, name, NotificationManager.IMPORTANCE_MIN)            channel?.enableLights(false)            channel?.enableVibration(false)            channel?.vibrationPattern = longArrayOf(0)            channel?.setSound(null, null)            getManager().createNotificationChannel(channel)        }    }

    private fun getManager(): NotificationManager {        if (manager == null) {            manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager        }        return manager!!    }

    @RequiresApi(api = Build.VERSION_CODES.O)    fun getChannelNotification(title: String, content: String, icon: Int, intent: Intent): Notification.Builder {

        val pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)        return Notification.Builder(context, id)                .setContentTitle(title)                .setContentText(content)                .setSmallIcon(icon)                .setAutoCancel(true)                .setContentIntent(pendingIntent)    }

    fun getNotification_25(title: String, content: String, icon: Int, intent: Intent): NotificationCompat.Builder {        val pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)        return NotificationCompat.Builder(context, id)                .setContentTitle(title)                .setContentText(content)                .setSmallIcon(icon)                .setAutoCancel(true)                .setVibrate(longArrayOf(0))                .setSound(null)                .setLights(0, 0, 0)                .setContentIntent(pendingIntent)    }}

5，Workmanager方式

Workmanager是Android JetPac中的一个API，借助Workmanager，我们可以用它来实现应用饿保活。使用前，我们需要依赖Workmanager库，如下：

implementation "android.arch.work:work-runtime:1.0.0-alpha06"

Worker是一个抽象类，用来指定需要执行的具体任务。

public class KeepLiveWork extends Worker {    private static final String TAG = "KeepLiveWork";

    @NonNull    @Override    public WorkerResult doWork() {        Log.d(TAG, "keep-> doWork: startKeepService");

        startJobService();

        startKeepService();        return WorkerResult.SUCCESS;    }}

然后，启动keepWork方法，

public void startKeepWork() {        WorkManager.getInstance().cancelAllWorkByTag(TAG_KEEP_WORK);        Log.d(TAG, "keep-> dowork startKeepWork");        OneTimeWorkRequest oneTimeWorkRequest = new OneTimeWorkRequest.Builder(KeepLiveWork.class)                .setBackoffCriteria(BackoffPolicy.LINEAR, 5, TimeUnit.SECONDS)                .addTag(TAG_KEEP_WORK)                .build();        WorkManager.getInstance().enqueue(oneTimeWorkRequest);

    }

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