android保活进程总结--双进程保活策略

进程的保活，在很多资讯类的App和即时通讯App的用处很大，奈何谷歌的推送服务在国内是被阉割了！据说是在8.0（奥利奥）相关政府机构已经将开放这项功能提上了日程，嗯，没错8.0，预计再过三五年就可以像苹果那样自由自在的推送了！但是一点不鸡冻，不知道我这秃头的码农还能不能挨到，哈哈！

先看看效果图：

这张图片的主要操作是杀死后台所有的应用进程，之后在状态栏上面弹出被拉起来的程！

测试机参数：

service：是一个后台服务，专门用来处理常驻后台的工作的组件。

一、优先级

进程的重要性优先级：（越往后的就越容易被系统杀死）
1.前台进程；Foreground process
1）用户正在交互的Activity（onResume（））
2）当某个Service绑定正在交互的Activity。
3）被主动调用为前台Service（startForeground()）
4）组件正在执行生命周期的回调（onCreate()/onStart()/onDestroy()）
5）BroadcastReceiver 正在执行onReceive();

2.可见进程；Visible process
1)我们的Activity处在onPause()（没有进入onStop()）
2)绑定到前台Activity的Service。

3.服务进程；Service process
简单的startService()启动。
4.后台进程；Background process
对用户没有直接影响的进程—-Activity出于onStop()的时候。
android:process=”:xxx”
5.空进程； Empty process
不含有任何的活动的组件。（android设计的，为了第二次启动更快，采取的一个权衡）

好了，基础知识回顾的差不多了！进入正题吧！

事先声明哈！其实是没有真正的进程的保活的，在手动杀死后台的时候，运行在系统后台的所有进程都是一一被杀死的，注意的是，一个一个被杀死的，所以我们才利用这个特性来做的！额。。中心思想即是，在应用被打开的时候，启动两个后台服务，这两个后台服务是相互依存的，也就是说，当一个进程被干掉的时候，另一个存活的进程就立马将其拉起唤醒，也就是打一个时间差！

嗯，上代码！

远程服务代码：

import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.os.RemoteException;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;

public class RemoteService extends Service {

    public static final String TAG = "tianchuangxin";
    private MyBinder binder;
    private MyServiceConnection conn;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return binder;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        if(binder ==null){
            binder = new MyBinder();
        }
        cOnn= new MyServiceConnection();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        RemoteService.this.bindService(new Intent(RemoteService.this, LocalService.class), conn, Context.BIND_IMPORTANT);

        PendingIntent cOntentIntent= PendingIntent.getService(this, 0, intent, 0);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        builder.setTicker("XXX")
        .setContentIntent(contentIntent)
        .setContentTitle("我是XXX，我怕谁!")
        .setAutoCancel(true)
        .setContentText("哈哈")
        .setWhen( System.currentTimeMillis());

        //把service设置为前台运行，避免手机系统自动杀掉改服务。
        startForeground(startId, builder.build());
        return START_STICKY;
    }

    class MyBinder extends RemoteConnection.Stub{

        @Override
        public String getProcessName() throws RemoteException {
            // TODO Auto-generated method stub
            return "LocalService";
        }

    }

    class MyServiceConnection implements ServiceConnection{

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.i(TAG, "建立连接成功！");

        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.i(TAG, "LocalService服务被干掉了~~~~断开连接！");
            Toast.makeText(RemoteService.this, "断开连接", 0).show();
            //启动被干掉的
            RemoteService.this.startService(new Intent(RemoteService.this, LocalService.class));
            RemoteService.this.bindService(new Intent(RemoteService.this, LocalService.class), conn, Context.BIND_IMPORTANT);
        }

    }


}

本地服务代码：

import com.dn.keepliveprocess.RemoteService.MyBinder;
import com.dn.keepliveprocess.RemoteService.MyServiceConnection;

import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.os.RemoteException;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;

public class LocalService extends Service {

    public static final String TAG = "tianchaungxin";
    private MyBinder binder;
    private MyServiceConnection conn;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return binder;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        if(binder ==null){
            binder = new MyBinder();
        }
        cOnn= new MyServiceConnection();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        LocalService.this.bindService(new Intent(LocalService.this, RemoteService.class), conn, Context.BIND_IMPORTANT);

        PendingIntent cOntentIntent= PendingIntent.getService(this, 0, intent, 0);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        builder.setTicker("XXX")
        .setContentIntent(contentIntent)
        .setContentTitle("我是XXX，我怕谁!")
        .setAutoCancel(true)
        .setContentText("哈哈")
        .setWhen( System.currentTimeMillis());

        //把service设置为前台运行，避免手机系统自动杀掉改服务。
        startForeground(startId, builder.build());
        return START_STICKY;
    }


    class MyBinder extends RemoteConnection.Stub{

        @Override
        public String getProcessName() throws RemoteException {
            // TODO Auto-generated method stub
            return "LocalService";
        }

    }

    class MyServiceConnection implements ServiceConnection{

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.i(TAG, "建立连接成功！");

        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.i(TAG, "RemoteService服务被干掉了~~~~断开连接！");
            Toast.makeText(LocalService.this, "断开连接", 0).show();
            //启动被干掉的
            LocalService.this.startService(new Intent(LocalService.this, RemoteService.class));
            LocalService.this.bindService(new Intent(LocalService.this, RemoteService.class), conn, Context.BIND_IMPORTANT);
        }

    }


}

JobService保证在息屏后，CPU进入休眠状态时进行唤醒

import java.util.List;

import android.annotation.SuppressLint;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningServiceInfo;
import android.app.job.JobInfo;
import android.app.job.JobParameters;
import android.app.job.JobScheduler;
import android.app.job.JobService;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;

@SuppressLint("NewApi")
public class JobHandleService extends JobService{
    private int kJobId = 0;
    @Override
    public void onCreate() {
        super.onCreate();
        Log.i("tianchuangxin", "jobService create");

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("tianchuangxin", "jobService start");
        scheduleJob(getJobInfo());
        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }

    @Override
    public boolean onStartJob(JobParameters params) {
        // TODO Auto-generated method stub
        Log.i("tianchuangxin", "job start");
// scheduleJob(getJobInfo());
        boolean isLocalServiceWork = isServiceWork(this, 你的本地服务ref----XXXX.LocalService);
        boolean isRemoteServiceWork = isServiceWork(this, 你的远程服务ref----XXXX.RemoteService);
// Log.i("INFO", "localSericeWork:"+isLocalServiceWork);
// Log.i("INFO", "remoteSericeWork:"+isRemoteServiceWork);
        if(!isLocalServiceWork||
           !isRemoteServiceWork){
            this.startService(new Intent(this,LocalService.class));
            this.startService(new Intent(this,RemoteService.class));
            Toast.makeText(this, "process start", Toast.LENGTH_SHORT).show();
        }
        return true;
    }

    @Override
    public boolean onStopJob(JobParameters params) {
        Log.i("tianchuangxin", "job stop");
// Toast.makeText(this, "process stop", Toast.LENGTH_SHORT).show();
        scheduleJob(getJobInfo());
        return true;
    }

    /** Send job to the JobScheduler. */
    public void scheduleJob(JobInfo t) {
        Log.i("tianchuangxin", "Scheduling job");
        JobScheduler tm =
                (JobScheduler) getSystemService(Context.JOB_SCHEDULER_SERVICE);
        tm.schedule(t);
    }

    public JobInfo getJobInfo(){
        JobInfo.Builder builder = new JobInfo.Builder(kJobId++, new ComponentName(this, JobHandleService.class));
        builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY);
        builder.setPersisted(true);
        builder.setRequiresCharging(false);
        builder.setRequiresDeviceIdle(false);
        builder.setPeriodic(10);//间隔时间--周期
        return builder.build();
    }


    /** 
 * 判断某个服务是否正在运行的方法 
 * 
 * @param mContext 
 * @param serviceName 
 * 是包名+服务的类名（例如：net.loonggg.testbackstage.TestService） 
 * @return true代表正在运行，false代表服务没有正在运行 
 */  
    public boolean isServiceWork(Context mContext, String serviceName) {  
        boolean isWork = false;  
        ActivityManager myAM = (ActivityManager) mContext  
                .getSystemService(Context.ACTIVITY_SERVICE);  
        List myList = myAM.getRunningServices(100);  
        if (myList.size() <= 0) {  
            return false;  
        }  
        for (int i = 0; i             String mName = myList.get(i).service.getClassName().toString();  
            if (mName.equals(serviceName)) {  
                isWork = true;  
                break;  
            }  
        }  
        return isWork;  
    }  
}

AIDL定义

interface RemoteConnection{
    String getProcessName();
}

我们再在MainActivity中进行调用：

public class MainActivity extends Activity {

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

        startService(new Intent(this, LocalService.class));
        startService(new Intent(this, RemoteService.class));
        startService(new Intent(this, JobHandleService.class));
    }

OK，所有代码基本在这了！哈哈！有问题的话留言交流！

每天进步一点点，时间会让你成为巨人！

我的Github地址：
https://github.com/T-chuangxin