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