性能优化二十三之Service进程防杀死

前言

Service作为四大组件之一很多安卓开发者对他肯定是又爱又恨，爱在它可以帮助我们去处理常驻后台的任务操作，比如说推送服务，心跳传输等，恨在当Servcie遇到360、腾讯管家之类的杀毒软件，变得脆弱，很容易被杀死，或者当用户手机锁屏会导致服务暂时停止运行。
我们常用的进程守护的套路无外乎以下几种:
一、提高进程的优先级数值
对于Service被系统回收，一般做法是通过提高优先级可以解决，在AndroidManifest.xml文件中对于intent-filter可以通过Android:priority = “1000”这个属性设置最高优先级，1000是最高值，如果数字越小则优先级越低。
二、改变进程等级

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 process1）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 process1)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）

三、设置 android:persistent属性为true

< application android:name="com.test.Application" android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:persistent="true"</span> android:theme="@style/AppTheme" >
< /application>

这个属性设置后，的确发现优先级提高不少，或许是相当于系统级的进程，但是还是无法保证存活。

四、onDestory方法内调用广播，重启Service
当service执行了onDestory的时候，发送一个自定义的广播，当收到广播的时候，重新启动service。

<receiver android:name="com.dbjtech.acbxt.waiqin.BootReceiver" >  <intent-filter>  <action android:name="android.intent.action.BOOT_COMPLETED" />  <action android:name="android.intent.action.USER_PRESENT" />  <action android:name="com.dbjtech.waiqin.destroy" />//这个就是自定义的action  </intent-filter>
</receiver>  @Override
public void onDestroy() {  stopForeground(true);  Intent intent = new Intent("com.dbjtech.waiqin.destroy");  sendBroadcast(intent);  super.onDestroy();
}  public class BootReceiver extends BroadcastReceiver {  @Override  public void onReceive(Context context, Intent intent) {  if (intent.getAction().equals("com.dbjtech.waiqin.destroy")) {  //TODO  //在这里写重新启动service的相关操作  startUploadService(context);  }  }  }

但是当使用类似于360卫士和腾讯管家等第三方应用或是在setting里-应用-强制停止时，APP进程可能就直接被干掉了，onDestroy方法都进不来，所以还是无法保证存活。
五、监听系统广播判断Service状态
通过系统的一些广播，比如：手机重启、界面唤醒、应用状态改变等等监听并捕获到，然后判断我们的Service是否还存活，记得加权限

<receiver android:name="com.dbjtech.acbxt.waiqin.BootReceiver" > <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> <action android:name="android.intent.action.USER_PRESENT" /> <action android:name="android.intent.action.PACKAGE_RESTARTED" /> <action android:name="com.dbjtech.waiqin.destroy" /> </intent-filter>
</receiver>

在BroadcastReceiver中：

@Override
public void onReceive(Context context, Intent intent) { if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) { System.out.println("手机开机了...."); startUploadService(context); } if (Intent.ACTION_USER_PRESENT.equals(intent.getAction())) { startUploadService(context); }
}

这个方法监听多了会导致Service很混乱，带来诸多麻烦。

六、QQ采取在锁屏的时候启动一个1个像素的Activity，当用户解锁以后将这个Activity结束掉（顺便同时把自己的核心服务再开启一次,接下来就来模拟实现：

//主界面Activity
public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Intent intent = new Intent(this, MyService.class);startService(intent);}public void jump(View v){Intent intent = new Intent(this, KeepLiveActivity.class);startActivity(intent);finish();}
}//1个像素的activity
public class KeepLiveActivity extends Activity {private static final String TAG = "kiven";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
//      setContentView(R.layout.activity_main);Log.i(TAG, "KeepLiveActivity----onCreate!!!");Window window = getWindow();window.setGravity(Gravity.LEFT|Gravity.TOP);LayoutParams params = window.getAttributes();params.height = 1;params.width = 1;params.x = 0;params.y = 0;   window.setAttributes(params);KeepLiveActivityManager.getInstance(this).setKeepLiveActivity(this);}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();Log.i(TAG, "KeepLiveActivity----onDestroy!!!");}
}//管理服务的开启与关闭
public class KeepLiveActivityManager {private static KeepLiveActivityManager instance;private Context context;private WeakReference<Activity> activityInstance;public static KeepLiveActivityManager getInstance(Context context) {if(instance==null){instance = new KeepLiveActivityManager(context.getApplicationContext());}return instance;}private KeepLiveActivityManager(Context context) {this.context = context;}public void setKeepLiveActivity(Activity activity){activityInstance = new WeakReference<Activity>(activity);}public void startKeepLiveActivity() {Intent intent = new  Intent(context, KeepLiveActivity.class);intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(intent);}public void finishKeepLiveActivity() {if(activityInstance!=null&&activityInstance.get()!=null){Activity activity = activityInstance.get();activity.finish();}}}//屏幕状态监听
public class ScreenListener {private Context mContext;private ScreenBroadcastReceiver mScreenReceiver;private ScreenStateListener mScreenStateListener;public ScreenListener(Context context) {mContext = context;mScreenReceiver = new ScreenBroadcastReceiver();}/*** screen状态广播接收者*/private class ScreenBroadcastReceiver extends BroadcastReceiver {private String action = null;@Overridepublic void onReceive(Context context, Intent intent) {action = intent.getAction();if (Intent.ACTION_SCREEN_ON.equals(action)) { // 开屏mScreenStateListener.onScreenOn();} else if (Intent.ACTION_SCREEN_OFF.equals(action)) { // 锁屏mScreenStateListener.onScreenOff();} else if (Intent.ACTION_USER_PRESENT.equals(action)) { // 解锁mScreenStateListener.onUserPresent();}}}/*** 开始监听screen状态* * @param listener*/public void begin(ScreenStateListener listener) {mScreenStateListener = listener;registerListener();getScreenState();}/*** 获取screen状态*/private void getScreenState() {PowerManager manager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);if (manager.isScreenOn()) {if (mScreenStateListener != null) {mScreenStateListener.onScreenOn();}} else {if (mScreenStateListener != null) {mScreenStateListener.onScreenOff();}}}/*** 停止screen状态监听*/public void unregisterListener() {mContext.unregisterReceiver(mScreenReceiver);}/*** 启动screen状态广播接收器*/private void registerListener() {IntentFilter filter = new IntentFilter();filter.addAction(Intent.ACTION_SCREEN_ON);filter.addAction(Intent.ACTION_SCREEN_OFF);filter.addAction(Intent.ACTION_USER_PRESENT);mContext.registerReceiver(mScreenReceiver, filter);}public interface ScreenStateListener {// 返回给调用者屏幕状态信息public void onScreenOn();public void onScreenOff();public void onUserPresent();}<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/><uses-permission android:name="android.permission.RECEIVE_USER_PRESENT"/>
}

上面实现了1像素保活，当接受到监听锁屏广播，就会启动这个1个像素的Activity，当监听界面唤醒广播，就结束掉这个1个像素的Activity，要监听锁屏的广播需要使用动态注册的方式(实际项目中不会出现静态注册广播的方式)。
七：双进程守护(重点)
如何让系统或者第三方应用无法杀死进程，除了上面的六种方式，还有的就是一般手机厂商会与app运营商达成合作，加入到白名单，就不会被杀死。这种方式我们一般是很难用的。但是另一种方式双进程守护方式来实现，什么是双进程守护？双进程守护—可以防止单个进程杀死，同时可以防止第三方的360清理掉。一个进程被杀死，另外一个进程又被他启动。相互监听启动。双进程的互相唤醒，就相当于双进程之间要进行互相通信，进程间的通信是通过binder机制，所以这两个进程之间可以通过aidl来实现。

RemoteConnection.aidl
interface RemoteConnection{String getProcessName();
}LocalService.java 本地服务
public class LocalService extends Service {public static final String TAG = "kiven";private MyBinder binder;private MyServiceConnection conn;@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn binder;}@Overridepublic void onCreate() {super.onCreate();if(binder ==null){binder = new MyBinder();}conn = new MyServiceConnection();}@Overridepublic 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("360").setContentIntent(contentIntent).setContentTitle("我是360").setAutoCancel(true).setContentText("hehehe").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{@Overridepublic String getProcessName() throws RemoteException {// TODO Auto-generated method stubreturn "LocalService";}}class MyServiceConnection implements ServiceConnection{@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {Log.i(TAG, "建立连接成功！");}@Overridepublic 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);}   }
}RemoteService.java: 远程服务（另一个进程）
public class RemoteService extends Service {public static final String TAG = "kiven";private MyBinder binder;private MyServiceConnection conn;@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn binder;}@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();if(binder ==null){binder = new MyBinder();}conn = new MyServiceConnection();}@Overridepublic 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("360").setContentIntent(contentIntent).setContentTitle("我是360").setAutoCancel(true).setContentText("hehehe").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{@Overridepublic String getProcessName() throws RemoteException {// TODO Auto-generated method stubreturn "LocalService";}}class MyServiceConnection implements ServiceConnection{@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {Log.i(TAG, "建立连接成功！");}@Overridepublic 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);}   }
}MainActivity.java:
public class MainActivity extends Activity {@Overrideprotected 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));}}JobHandleService.java: JobHandlerService的作用是为了防止应用被强制关闭导致服务被杀（实际开发不建议使用，太流氓了）
@SuppressLint("NewApi")
public class JobHandleService extends JobService{private int kJobId = 0;@Overridepublic void onCreate() {super.onCreate();Log.i("INFO", "jobService create");}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Log.i("INFO", "jobService start");scheduleJob(getJobInfo());return START_NOT_STICKY;}@Overridepublic void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();}@Overridepublic boolean onStartJob(JobParameters params) {// TODO Auto-generated method stubLog.i("INFO", "job start");
//      scheduleJob(getJobInfo());boolean isLocalServiceWork = isServiceWork(this, "com.kiven.keepliveprocess.LocalService");boolean isRemoteServiceWork = isServiceWork(this, "com.kiven.keepliveprocess.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;}@Overridepublic boolean onStopJob(JobParameters params) {Log.i("INFO", "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("INFO", "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<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;  }
}AndroidManifest.xml:
....
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
...<service android:name="com.kiven.keepliveprocess.LocalService"></service><service android:name="com.kiven.keepliveprocess.RemoteService"android:process=":remoteprocess"></service><service android:name="com.kiven.keepliveprocess.JobHandleService" android:permission="android.permission.BIND_JOB_SERVICE"></service></application></manifest>

至此，进程保活的方式介绍完毕，实际上进程保护有很多种方式，需要根据实际的需求去选择适合的方式，一个小建议:不要把app搞的太”流氓”，会导致用户手机用电量飙升，CPU发热，也对用户的体验不好。

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性能优化二十三之Service进程防杀死

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