Android服务保活-JobScheduler拉活

方案设计

Android5.0 以后系统对 Native 进程等加强了管理，Native 拉活方式失效。系统在 Android5.0 以上版本提供了 JobScheduler 接口，系统会定时调用该进程以使应用进行一些逻辑操作。

方案适用范围

该方案主要适用于 Android5.0 以上版本手机。

该方案在 Android5.0 以上版本中不受 forcestop 影响，被强制停止的应用依然可以被拉活，在 Android5.0 以上版本拉活效果非常好。

仅在小米手机可能会出现有时无法拉活的问题。

方案实现

JobSchedulerService

package com.aoaoyi.service;

import android.annotation.TargetApi;
import android.app.job.JobParameters;
import android.app.job.JobService;
import android.content.Intent;
import android.os.Build;

/**
 * Created by xy on 2016/12/2.
 */

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public class JobSchedulerService extends JobService{

    @Override
    public boolean onStartJob(JobParameters params) {
        startMainService();
        jobFinished(params, false);
        return true;
    }

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

    @Override
    public void onTaskRemoved(Intent rootIntent) {
        startMainService();
    }

    public void startMainService(){
        startService(MainService.getIntentAlarm(this));
    }
}

在AndroidManifest.xml中注册

        
 <service
 android:name="com.aoaoyi.service.JobSchedulerService"
 android:permission="android.permission.BIND_JOB_SERVICE"
 android:enabled="true"
 android:exported="true"
 android:process=":push"/>   

在AndroidManifest.xml中加入权限

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

MainService

  
package com.aoaoyi.service;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.app.job.JobInfo;
import android.app.job.JobScheduler;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.IBinder;

public class MainService extends Service {

    /**
     * 每10分钟检查一次链接状态，确保service不被杀掉
     */
    private static final int KEEP_ALIVE_INTERVAL = BuildConfig.DEBUG ? 1 * 60 * 1000 : 10 * 60 * 1000;

    /**
     * ACTION Start
     */
    private static final String ACTION_START = "MainService.Action.Start";
    /**
     * ACTION Alarm
     */
    private static final String ACTION_ALARM = "MainService.Action.Alarm";
    /**
     * ACTION end start
     */
    private static final String ACTION_END_START = "MainService.Action.EndStart";

    private boolean mIsAddAliveAlarm = false;

    public MainService() {

    }

    @Override
    public IBinder onBind(Intent intent) {

        return null;
    }

    @Override
    public void onCreate() {
        if (!mIsAddAliveAlarm){
            addAliveAlarm();
            mIsAddAliveAlarm = true;
        }
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent pIntent, int pFlags, int pStartId) {
        if (null != pIntent){
            switch (pIntent.getAction()){
                case ACTION_START:

                    break;
                case ACTION_ALARM:

                    break;
                case ACTION_END_START:

                    break;
            }
        }
        if (!mIsAddAliveAlarm){
            addAliveAlarm();
            mIsAddAliveAlarm = true;
        }
        return START_STICKY;
    }

    @Override
    public void onTaskRemoved(Intent pIntent) {
        onEnd();
    }

    @Override
    public void onDestroy() {
        onEnd();
        super.onDestroy();
    }

    private void onEnd() {
        startService(getIntentEndStart(getApplicationContext()));
    }


    /**
     * 添加重复唤醒闹钟，用于不停唤起服务
     */
    private void addAliveAlarm() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            JobInfo.Builder _Builder = new JobInfo.Builder(0, new ComponentName(getApplication(), JobSchedulerService.class));
            _Builder.setPeriodic(KEEP_ALIVE_INTERVAL);
            _Builder.setPersisted(true);
            JobScheduler _JobScheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
            _JobScheduler.schedule(_Builder.build());
        }else {
            PendingIntent _PendingIntent = PendingIntent.getService(this, 0, getIntentAlarm(this), PendingIntent.FLAG_UPDATE_CURRENT);
            AlarmManager _AlarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
            _AlarmManager.cancel(_PendingIntent);
            _AlarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + KEEP_ALIVE_INTERVAL, KEEP_ALIVE_INTERVAL, _PendingIntent);
        }
    }

    /**
     * Start
     *
     * @param pContext
     */
    public static Intent getIntentStart(Context pContext) {
        return getActionIntent(pContext, ACTION_START);
    }

    /**
     * Alarm
     *
     * @param pContext
     */
    public static Intent getIntentAlarm(Context pContext) {
        return getActionIntent(pContext, ACTION_ALARM);
    }

    /**
     * EndStart
     *
     * @param pContext
     */
    public static Intent getIntentEndStart(Context pContext) {
        return getActionIntent(pContext, ACTION_END_START);
    }

    /**
     * Service Intent
     *
     * @param pContext
     * @param pAction
     * @return
     */
    private static Intent getActionIntent(Context pContext, String pAction) {
        Intent _Intent = new Intent(pContext, MainService.class);
        _Intent.setAction(pAction);
        return _Intent;
    }

}

最后一步，在主Activity启动一次MainService

startService(MainService.getIntentStart(this));

效果试试哦^_^