Android 盒子开发5.0以下双进程守护

1、说起双进程守护相信大家都不陌生了，就是一个兄弟A，一个兄弟B 两个人长大后都要自己去赚钱养家，例如兄弟A没赚到钱，然后兄弟B赚了很多钱，作为好兄弟肯定要拉一把，同样当兄弟A富有，兄弟B变穷的时候，同样兄弟A也需要拉兄弟B一把

目的就是双赢

我现在针对的是Android5.0一下盒子（已经root过）

首先需要创建一个BaseService 然后在创建一个KeepService直接在onCreate里面初始化

 println("1111----BaseService onCreate")
        keepService2()
        println("2222----BaseService onCreate")
//    startService(new Intent(this,DaHuaCamService.class));

        object : Thread() {
            override fun run() {
                while (true) {
                    val isRun = Utils.isServiceWork(this@BaseService,
                            "com.hzx.homecenter2.service.KeepService")
                    if (isRun) {
                        val msg = Message.obtain()
                        msg.what = 1
                        m_Handler.sendMessage(msg)
                    }
                    try {
                        Thread.sleep(1)
                    } catch (e: InterruptedException) {
                        e.printStackTrace()
                    }
                }
            }
        }
        thread.start()

override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
    return START_STICKY
}

这个方法就不多说了相信大家都知道，就是service异常中断会重启，但是不能保证100%重启成功

internal var thread = Thread(Runnable {
    val timer = Timer()
    val task = object : TimerTask() {

        override fun run() {
            //             Log.e(TAG, "ServiceTwo Run: " + System.currentTimeMillis());
            val b = isServiceWorked()
            if (!b) {
                val service = Intent(this@BaseService, KeepService::class.java)
                startService(service)
            }
        }
    }
    timer.schedule(task, 0, 1000)
})

检测当前有哪些Service允许

fun isServiceWorked(): Boolean {
    val myManager = this.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
    val runningService = myManager.getRunningServices(Integer.MAX_VALUE) as java.util.ArrayList<ActivityManager.RunningServiceInfo>
    for (i in runningService.indices) {
        if (runningService[i].service.className.toString() == "com.hzx.homecenter2.service.KeepService") {
            return true
        }
    }
    return false

OnTrimMemory是Android 4.0之后提供的API，系统会根据不同的内存状态来回调。系统提供的回调有：
Application.onTrimMemory()
Activity.onTrimMemory()
Fragement.OnTrimMemory()
Service.onTrimMemory()
ContentProvider.OnTrimMemory()
OnTrimMemory的参数是一个int数值，代表不同的内存状态：
TRIM_MEMORY_COMPLETE：内存不足，并且该进程在后台进程列表最后一个，马上就要被清理
TRIM_MEMORY_MODERATE：内存不足，并且该进程在后台进程列表的中部。
TRIM_MEMORY_BACKGROUND：内存不足，并且该进程是后台进程。
TRIM_MEMORY_UI_HIDDEN：内存不足，并且该进程的UI已经不可见了。 
以上4个是4.0增加
TRIM_MEMORY_RUNNING_CRITICAL：内存不足(后台进程不足3个)，并且该进程优先级比较高，需要清理内存
TRIM_MEMORY_RUNNING_LOW：内存不足(后台进程不足5个)，并且该进程优先级比较高，需要清理内存
TRIM_MEMORY_RUNNING_MODERATE：内存不足(后台进程超过5个)，并且该进程优先级比较高，需要清理内存 

以上3个是4.1增加

/**
 * 判断KeepService是否还在运行，如果不是则启动KeepService
 */
private fun keepService2() {
    val isRun = Utils.isServiceWork(this@BaseService, "com.hzx.homecenter2.service.KeepService")
    if (isRun == false) {
        startS2.startService()
    }
}

private val startS2: StrongService = object : StrongService {
    override fun startService() {
        val i = Intent(baseContext, KeepService::class.java)
        baseContext.startService(i)
    }

    override fun stopService() {
        val i = Intent(baseContext, KeepService::class.java)
        baseContext.stopService(i)
    }
}

实现Bind绑定

var myBinder = MyBinder()

override fun onBind(p0: Intent?): IBinder {
    return startS2 as IBinder
}

inner class MyBinder : Binder() {
    val service: BaseService
        get() = this@BaseService
}

另外我设置的是全局启动 需要一个SampleApplicationLike是DefaultApplicationLike然后设置全局启动

IntentFilter filter = new IntentFilter(Intent.ACTION_TIME_TICK);//service结束无法重启修改，待验证
SampleApplicationLike.getInstance().getApplication().registerReceiver(checkServiceReceiver, filter);

通过一个TIME_TCIK Action去检测广播

private BroadcastReceiver checkServiceReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        boolean isServiceRunning = false;
        if (intent.getAction().equals(Intent.ACTION_TIME_TICK)) {
            //检查Service状态
            ActivityManager manager = (ActivityManager) SampleApplicationLike.getInstance().getApplication().getSystemService(Context.ACTIVITY_SERVICE);
            for (ActivityManager.RunningServiceInfo serviceInfo : manager.getRunningServices(Integer.MAX_VALUE)) {
                if ("com.hzx.homecenter2.service.BaseService".equals(serviceInfo.service.getClassName())) {
                    isServiceRunning = true;
                }
            }

            if (!isServiceRunning) {
                Intent intent1 = new Intent(SampleApplicationLike.getInstance().getApplication(), KeepService.class);
                intent.setFlags(intent1.FLAG_ACTIVITY_NEW_TASK);
                SampleApplicationLike.getInstance().getApplication().startService(intent1);
            }
        }
    }
};

下面是KeepService

package com.hzx.homecenter2.service

import android.app.ActivityManager
import android.app.Service
import android.content.Context
import android.content.Intent
import android.os.Handler
import android.os.IBinder
import android.os.Message

import com.hzx.homecenter2.interfaces.StrongService
import com.hzx.homecenter2.util.Utils
import java.util.*


/**
 * Created by carlosmx on 05/02/2018.
 */
class KeepService : Service() {


    private val handler = object : Handler() {
        override fun handleMessage(msg: Message) {
            when (msg.what) {
                1 -> {
                    keepService1()
                }

                else -> {
                }
            }
        }

    }

    private val startS1: StrongService = object : StrongService {
        override fun startService() {
            val i = Intent(baseContext, BaseService.javaClass)
            baseContext.startService(i)
            println("1111----start BaseService")
        }

        override fun stopService() {
            val i = Intent(baseContext, BaseService.javaClass)
            baseContext.stopService(i)
        }
    }

    override fun onTrimMemory(level: Int) {
        keepService1()
    }

    override fun onCreate() {
        super.onCreate()
        println("1111----KeepService onCreate")
        keepService1()
        thread.start()
    }

    private fun keepService1() {
        val isRun = Utils.isServiceWork(this@KeepService, "com.hzx.homecenter2.service.BaseService")
        if (isRun == false) {
            startS1.startService()
        }
    }

    fun iServiceWork(): Boolean {

        return false
    }

    internal var thread = Thread(Runnable {
        val timer = Timer()
        val task = object : TimerTask() {

            override fun run() {
                //             Log.e(TAG, "ServiceTwo Run: " + System.currentTimeMillis());
                val b = isServiceWorked()
                if (!b) {
                    val service = Intent(this@KeepService, BaseService::class.java)
                    startService(service)
                }
            }
        }
        timer.schedule(task, 0, 1000)
    })

    override fun onBind(p0: Intent?): IBinder {
        return startS1 as IBinder
    }

    fun isServiceWorked(): Boolean {
        val myManager = this.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
        val runningService = myManager.getRunningServices(Integer.MAX_VALUE) as ArrayList<ActivityManager.RunningServiceInfo>
        for (i in runningService.indices) {
            if (runningService[i].service.className.toString() == "com.hzx.homecenter2.service.BaseService") {
                return true
            }
        }
        return false

    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
//        return START_REDELIVER_INTENT;
        return START_STICKY
    }

    override fun onDestroy() {
        super.onDestroy()
//        if(thread!=null)
//        {
//            thread.interrupt()
//        }
    }

}

主Activity

private ServiceConnection serviceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        System.out.println("seviceconnected :" + name);
        Global.context = ((BaseService.MyBinder) service).getService();

    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        Global.context = null;
        System.out.println("servicedisconnected");

    }
};

实现效果