Android 之 守護進程

之前，低版本做守護進程時，就是兩個service 相互守護，但是大於5.0後，似乎就不管用了，今天我們來看看，怎麼解決這個問題，多的不說，直接上代碼：

首先是有業務處理的service：

public class GuardMessageService extends Service{

    @Override
    public void onCreate() {
        super.onCreate();
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true){
                    System.out.println("=====守護進程======");
                    try {
                        Thread.sleep(2000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

            }
        }).start();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        startForeground(1,new Notification());
        bindService(new Intent(this, GuardService.class),connection, Context.BIND_IMPORTANT);

        return START_STICKY;
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return new GuardAidl.Stub() {};
    }

    private ServiceConnection connection=new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //建立連接
            Toast.makeText(GuardMessageService.this,"建立連接",Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            //連接斷開了
            startService(new Intent(GuardMessageService.this,GuardService.class));
            bindService(new Intent(GuardMessageService.this, GuardService.class),connection, Context.BIND_IMPORTANT);
        }
    };

 }

2.守護的service：

public class GuardService extends Service{
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return new GuardAidl.Stub() {};
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        startForeground(1,new Notification());
        bindService(new Intent(this, GuardMessageService.class),connection, Context.BIND_IMPORTANT);

        return START_STICKY;
    }

    private ServiceConnection connection=new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //建立連接
            Toast.makeText(GuardService.this,"建立連接",Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            //連接斷開了
            startService(new Intent(GuardService.this,GuardMessageService.class));
            bindService(new Intent(GuardService.this, GuardMessageService.class),connection, Context.BIND_IMPORTANT);
        }
    };
}

3.爲了解決5.0 以上，設置的一個service：

public class JobWakeUpService extends JobService{

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        JobInfo.Builder jobBuilder = new JobInfo.Builder(
                1,new ComponentName(this,JobWakeUpService.class));
        jobBuilder.setPeriodic(2000);

        JobScheduler jobScheduler = (JobScheduler) getSystemService(Context.JOB_SCHEDULER_SERVICE);
        jobScheduler.schedule(jobBuilder.build());
        return START_STICKY;
    }

    @Override
    public boolean onStartJob(JobParameters params) {

        // 判斷服務有沒有在運行
        boolean messageServiceAlive = serviceAlive(GuardMessageService.class.getName());
        if(!messageServiceAlive){
            startService(new Intent(this,GuardMessageService.class));
        }

        return false;
    }

    @Override
    public boolean onStopJob(JobParameters params) {
        return false;
    }

    /**
     * 判斷某個服務是否正在運行的方法
     */
    private boolean serviceAlive(String serviceName) {
        boolean isWork = false;
        ActivityManager myAM = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningServiceInfo> myList = myAM.getRunningServices(100);
        if (myList.size() <= 0) {
            return false;
        }
        for (int i = 0; i < myList.size(); i++) {
            String mName = myList.get(i).service.getClassName().toString();
            if (mName.equals(serviceName)) {
                isWork = true;
                break;
            }
        }
        return isWork;
    }
}

最後是AndroidManifest.xml的配置：

 // JobService權限
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

 <service android:name=".services.GuardService"
        android:process=":guardService"/>
    <service android:name=".services.GuardMessageService"/>
    <service android:name=".services.JobWakeUpService"
        android:enabled="true"
       android:permission="android.permission.BIND_JOB_SERVICE"
     />

調用：

      //啓動守護進程
            startService(new Intent(mContext, GuardMessageService.class));
            startService(new Intent(mContext, GuardService.class));
            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
                //必須大於5.0
                startService(new Intent(mContext,JobWakeUpService.class));
            }