客户端保活最佳方案机制

更优雅的利用系统机制保活

使用场景

一个云控脚本引擎

需求目的

需要让程序一直在后台运行保持不被系统杀死避免让用户在使用过程中还需时刻盯着程序造成不必要的繁琐问题以达到配置好相关信息后只需提供设备电量后续便可不用碰设备实现远程云控效果

参考实现

音乐类程序例如QQ音乐能一直在后台播放

相关代码

代码区

class SilentMusicService : Service() {
    private var mMediaPlayer: MediaPlayer? = null
    private var mAudioManager: AudioManager? = null
    private lateinit var notificationBuilder: NotificationCompat.Builder
    private val mAudioFocusChange: OnAudioFocusChangeListener =
        object : OnAudioFocusChangeListener {
            override fun onAudioFocusChange(focusChange: Int) {
                when (focusChange) {
                    AudioManager.AUDIOFOCUS_GAIN -> {
                        try {
                            startPlayMusic()
                        } catch (e: Exception) {
                            e.printStackTrace()
                        }
                    }
                    AudioManager.AUDIOFOCUS_LOSS -> {
                        mAudioManager!!.abandonAudioFocus(this)
                    }
                }
            }
        }

    override fun onBind(intent: Intent): IBinder? {
        throw UnsupportedOperationException("Not yet implemented")
    }

    @RequiresApi(Build.VERSION_CODES.O)
    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
        NotificationUtils.notify(0) { param ->
            intent.putExtra("id", 0)
            notificationBuilder = param.setSmallIcon(R.mipmap.ic_launcher)
                .setContentText(R.string.this_is_a_running_foreground_process.toText())
                .setAutoCancel(false)
                .setOngoing(true)
        }
        NotificationUtils.cancelAll()
        startForeground(1, notificationBuilder.notification)
        mAudioManager = getSystemService(AUDIO_SERVICE) as AudioManager
        if (mAudioManager != null) mAudioManager!!.requestAudioFocus(
            mAudioFocusChange,
            AudioManager.STREAM_MUSIC,
            AudioManager.AUDIOFOCUS_GAIN
        )
        mMediaPlayer = MediaPlayer.create(applicationContext, R.raw.no_notice)
        mMediaPlayer?.isLooping = true
        startPlayMusic()
        return START_STICKY
    }

    private fun startPlayMusic() {
        if (mMediaPlayer != null && !mMediaPlayer!!.isPlaying) {
            mMediaPlayer!!.start()
        }
    }

    private fun stopPlayMusic() {
        if (mMediaPlayer != null) {
            mMediaPlayer!!.stop()
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        stopPlayMusic()
        startService(Intent(this, SilentMusicService::class.java))
    }
}

清单区

<service
    android:name=".service.SilentMusicService"
    android:priority="1000"
    android:enabled="true"
    android:process=":musicService"/>

测试结果

机型品牌	系统版本	成果
HUAWEI	7.0 8.1 9.0	可长时间运转完成任务
Redmi	9.0 10 11	可长时间运转完成任务(10以上添加另外的保活配置)
Vivo、OPPO	10	可长时间运转完成任务(测试次数过少)