在上一章中，我们谈到了Android Service防杀的常用套路，随着越来越多的用户手机安装某卫士，某管家，常用的进程防杀套路并不能够很好的保证我们的APP进程常驻，因此本篇我给大家带来抗某卫士，某管家的双进程守护解决方案。
双进程守护，其实原理非常简单，网上也有很多博文讲述，今天我给大家用一个完整的案例来讲述。
假设我们的APP中开启了两个Service，分别是A和B，那么：
如果A守护B，则B挂掉的同时，A就应该把B启动起来，反之亦然，也就是说A和B应该是互相守护，无论谁被杀掉，对方就把它拉起来。
既然提到了两个Service，那么这两个Service就不能让它们同处在一个进程中，否则就会被一次性双杀。这里我们很容易想到IPC技术，在Android中通常我们可以使用AIDL来实现IPC操作。废话不多说，直接上代码。
先来看下项目整体结构：
这里，我们定义两个Service，分别是LocalCastielService和RemoteCastielService，其中的RemoteCastielService我们通过属性配置android:process=”:com.castiel.remote” ，让它成为远端进程。
LocalCastielService.Java
public class LocalCastielService extends Service {
MyBinder myBinder;
private PendingIntent pintent;
MyServiceConnection myServiceConnection;
@Override
public void onCreate() {
super.onCreate();
if (myBinder == null) {
myBinder = new MyBinder();
}
myServiceConnection = new MyServiceConnection();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
this.bindService(new Intent(this, RemoteCastielService.class), myServiceConnection, Context.BIND_IMPORTANT);
Notification notification = new Notification(R.drawable.ic_launcher, "猴子服务启动中", System.currentTimeMillis());
pintent = PendingIntent.getService(this, 0, intent, 0);
notification.setLatestEventInfo(this, "猴子服务", "防止被杀掉！", pintent);
// 设置service为前台进程，避免手机休眠时系统自动杀掉该服务
startForeground(startId, notification);
return START_STICKY;
}
class MyServiceConnection implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName arg0, IBinder arg1) {
Log.i("castiel", "远程服务连接成功");
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
// 连接出现了异常断开了，RemoteService被杀掉了
Toast.makeText(LocalCastielService.this, "远程服务Remote被干掉", Toast.LENGTH_LONG).show();
// 启动RemoteCastielService
LocalCastielService.this.startService(new Intent(LocalCastielService.this, RemoteCastielService.class));
LocalCastielService.this.bindService(new Intent(LocalCastielService.this, RemoteCastielService.class),
myServiceConnection, Context.BIND_IMPORTANT);
}
}
class MyBinder extends CastielProgressConnection.Stub {
@Override
public String getProName() throws RemoteException {
return "Local猴子搬来的救兵 http://blog.csdn.net/mynameishuangshuai";
}
}
@Override
public IBinder onBind(Intent arg0) {
return myBinder;
}
}
RemoteCastielService.java
public class RemoteCastielService extends Service {
MyBinder myBinder;
private PendingIntent pintent;
MyServiceConnection myServiceConnection;
@Override
public void onCreate() {
super.onCreate();
if (myBinder == null) {
myBinder = new MyBinder();
}
myServiceConnection = new MyServiceConnection();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
this.bindService(new Intent(this,LocalCastielService.class), myServiceConnection, Context.BIND_IMPORTANT);
Notification notification = new Notification(R.drawable.ic_launcher,
"猴子服务启动中",
System.currentTimeMillis());
pintent=PendingIntent.getService(this, 0, intent, 0);
notification.setLatestEventInfo(this, "猴子服务",
"防止被杀掉！", pintent);
//设置service为前台进程，避免手机休眠时系统自动杀掉该服务
startForeground(startId, notification);
return START_STICKY;
}
class MyServiceConnection implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName arg0, IBinder arg1) {
Log.i("castiel", "本地服务连接成功");
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
// 连接出现了异常断开了，LocalCastielService被杀死了
Toast.makeText(RemoteCastielService.this, "本地服务Local被干掉", Toast.LENGTH_LONG).show();
// 启动LocalCastielService
RemoteCastielService.this.startService(new Intent(RemoteCastielService.this,LocalCastielService.class));
RemoteCastielService.this.bindService(new Intent(RemoteCastielService.this,LocalCastielService.class), myServiceConnection, Context.BIND_IMPORTANT);
}
}
class MyBinder extends CastielProgressConnection.Stub {
@Override
public String getProName() throws RemoteException {
return "Remote猴子搬来的救兵 http://blog.csdn.net/mynameishuangshuai";
}
}
@Override
public IBinder onBind(Intent arg0) {
return myBinder;
}
}
aidl文件
package com.castiel.aidl;
interface CastielProgressConnection{
String getProName();
}
启动服务
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 启动本地服务和远程服务
startService(new Intent(this, LocalCastielService.class));
startService(new Intent(this, RemoteCastielService.class));
}
通过以上代码可以看出，双进程守护实现代码非常简单，两个服务相互连接，Local服务连接着Remote服务，Remote服务又连接着Local服务，你中有我我中有你，一旦两个服务发现对方被杀掉，另一服务立刻会启动并连接它