Android 2个Service实现相互保活，通过bindservice来实现，不通过广播实现

1，实现原理：启动2个Service，相互绑定监听，当A Service监听到连接断开的时候，说明B服务可能被 Kill掉了，这时需要重新开启A服务，同样B服务的监听断掉了，重新启动A服务。A，B两个服务都是单独的进程，需要使用AIDL来通讯。

2，A服务源码：

public class StepService extends Service {

String TAG="StepService";
private int NOTICE_ID=1000;
@Override
public void onCreate() {
    super.onCreate();
    LogUtil.d(TAG,"StepService 被创建:"+new Date().toLocaleString());
    startGuardService();
}

void startGuardService(){
    new Thread(new Runnable() {
        @Override
        public void run() {
            Intent service=new Intent("com.foxconn.androidlib.service.GuardService");
            String packageName = "com.foxconn.androidlib";//需要开启服务的app包名
            String serviceClassName = packageName + "com.foxconn.androidlib.service.GuardService";//服务的类名全限定名
            service.setComponent(new ComponentName(packageName, "com.foxconn.androidlib.service.GuardService"));
            startService(service);
            bindService(service,mServiceConnection, Context.BIND_AUTO_CREATE);
        }
    }).start();
}

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

private Notification getNotification(){
    String channelId = "notification_simple";
    Notification notification;
    if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.O) {
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        NotificationChannel channel = new NotificationChannel(channelId, "simple", NotificationManager.IMPORTANCE_DEFAULT);
        manager.createNotificationChannel(channel);
        notification = new NotificationCompat.Builder(this, channelId)
                .setContentTitle("保持前台运行")

// .setContentText(“This is content text”)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
.build();
// manager.notify(1, notification);
}else{
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notification = new NotificationCompat.Builder(this, channelId)
.setContentTitle(“保持前台运行”)
// .setContentText(“This is content text”)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
.build();
// manager.notify(1, notification);
}
return notification;
}

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

// startForeground(1, new Notification());
//绑定建立链接
return super.onStartCommand(intent,flags,startId);
}

private ServiceConnection mServiceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        //链接上
        Log.d(TAG, "StepService:建立链接");
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        LogUtil.d(TAG,"StepService 断开连接:"+new Date().toLocaleString());
        //断开链接

// startService(new Intent(StepService.this, GuardService.class));
startGuardService();
}
};

@Override
public void onDestroy() {

// releaseLock();
LogUtil.d(TAG,”StepService 销毁:”+new Date().toLocaleString());
unbindService(mServiceConnection);
super.onDestroy();
}

private PowerManager.WakeLock mWakeLock;
/**
 * 同步方法 得到休眠锁
 *
 * @param context
 * @return
 */
synchronized private void getLock(Context context) {
    if (mWakeLock == null) {
        PowerManager mgr = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        mWakeLock = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, StepService.class.getName());
        mWakeLock.setReferenceCounted(true);
        Calendar c = Calendar.getInstance();
        c.setTimeInMillis((System.currentTimeMillis()));
        int hour = c.get(Calendar.HOUR_OF_DAY);
        if (hour >= 23 || hour <= 6) {
            mWakeLock.acquire(5000);
        } else {
            mWakeLock.acquire(300000);
        }
    }
    Log.v(TAG, "get lock");
}

synchronized private void releaseLock()
{
    if(mWakeLock!=null){
        if(mWakeLock.isHeld()) {
            mWakeLock.release();
            Log.v(TAG,"release lock");
        }

        mWakeLock=null;
    }
}

}

3，B服务的源源码如下：

public class GuardService extends Service {
String TAG=”GuardService”;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return new ProcessConnection.Stub() {
};
}

@Override
public void onCreate() {
    super.onCreate();
    LogUtil.d(TAG,"GuardService 创建:"+new Date().toLocaleString());
    startStepService();
}

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

// startForeground(1, new Notification());
//绑定建立链接

    return super.onStartCommand(intent,flags,startId);
}

void startStepService(){
    new Thread(new Runnable() {
        @Override
        public void run() {
            Intent service=new Intent("com.foxconn.androidlib.service.StepService");
            String packageName = "com.foxconn.androidlib";//需要开启服务的app包名
            String serviceClassName = packageName + ".StepService";//服务的类名全限定名
            service.setComponent(new ComponentName(packageName, "com.foxconn.androidlib.service.StepService"));
            startService(service);
            bindService(service,mServiceConnection, Context.BIND_AUTO_CREATE);
        }
    }).start();
}

private ServiceConnection mServiceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        //链接上
        Log.d("test", "GuardService:建立链接");
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        LogUtil.d(TAG,"GuardService 断开链接:"+new Date().toLocaleString());
        //断开链接
        startStepService();
    }
};

@Override
public void onDestroy() {
    super.onDestroy();
    LogUtil.d(TAG,"GuardService 销毁:"+new Date().toLocaleString());
    unbindService(mServiceConnection);
}

}

4，AIDL文件如下：

interface ProcessConnection {
/**
* Demonstrates some basic types that you can use as parameters
* and return values in AIDL.
*/
}
5，AndroidManifest.xml 代码如下：

    <service
        android:name="com.foxconn.androidlib.service.StepService"
        android:exported="true"
        android:process=":istep.service">
        <intent-filter>
            <action android:name="com.foxconn.androidlib.service.StepService"/>
        </intent-filter>
    </service>

    <service
        android:name="com.foxconn.androidlib.service.GuardService"
        android:exported="true"
        android:process=":GuardService">
        <intent-filter>
            <action android:name="com.foxconn.androidlib.service.GuardService"/>
        </intent-filter>
    </service>

6，启动Service：

Intent service = new Intent(“com.foxconn.androidlib.service.StepService”);
String packageName = “com.foxconn.androidlib”;//需要开启服务的app包名
String serviceClassName = packageName + “.StepService”;//服务的类名全限定名
service.setComponent(new ComponentName(packageName, “com.foxconn.androidlib.service.StepService”));
startService(service);
Intent service2 = new Intent(“com.foxconn.androidlib.service.GuardService”);
service2.setComponent(new ComponentName(packageName, “com.foxconn.androidlib.service.GuardService”));
startService(service2);