应用
AndroidManifest.xml
<service
android:name=".antirush.ScheduleService"
android:permission="android.permission.BIND_JOB_SERVICE" />
ScheduleService
public class ScheduleService extends JobService {
private static final String TAG = "ScheduleService";
@Override
public boolean onStartJob(JobParameters params) {
Log.d(TAG, "onStartJob");
//这个返回值是有讲究的
//true表示Service的工作在一个独立线程中执行，工作完成之后需要调用jobFinish方法通知JobScheduler工作完成
//false表示Service的工作已经完成，JobScheduler收到通知之后会释放资源
return false;
}
@Override
public boolean onStopJob(JobParameters params) {
Log.d(TAG, "onStopJob");
//true表示需要进行重试
//false表示不再进行重试，Job将会被丢弃
return false;
}
}
JobScheduler
private static final int JOB_ID = 1024;
private void startJobServiceForKeepAlive(Context context) {
JobScheduler jobScheduler = (JobScheduler) context.getSystemService(Context.JOB_SCHEDULER_SERVICE);
if (jobScheduler == null) {
return;
}
JobInfo jobInfo =new JobInfo.Builder(JOB_ID, new ComponentName(context, ScheduleService.class))
.setBackoffCriteria(1000,JobInfo.BACKOFF_POLICY_LINEAR) //重试机制
.setMinimumLatency(1000) //设置延迟时间
.setOverrideDeadline(10000) //设置最后期限，如果达到该时间点，Job还没被执行，那么会强制执行一次
.setPeriodic(2000) //每隔2s执行一次，跟上面两个会冲突
.setPersisted(true) //持久化，就算手机关机，启动之后也可以恢复Job，需要RECEIVE_BOOT_COMPLETED权限
.setRequiredNetworkType(JobInfo.NETWORK_TYPE_UNMETERED) //设置Job依赖的网络类型
.setRequiresCharging(false) //是否要求设备处于充电状态
.setRequiresDeviceIdle(false) //是否要求设备处于空闲状态
.build()
JobInfo jobInfo = builder.build();
int schedule = jobScheduler.schedule(jobInfo);
if (schedule <= 0) {
Log.w(TAG, "schedule error");
}
}
/**
* 正常服务停止时取消JobService
*/
private void cancelJobService(Context context) {
JobScheduler jobScheduler = (JobScheduler) context.getSystemService(Context.JOB_SCHEDULER_SERVICE);
if (jobScheduler == null) {
return;
}
jobScheduler.cancel(JOB_ID);
}
Framework
源码
UML-schedule
UML-cancel
策略实现
public JobSchedulerService(Context context) {
super(context);
// Create the controllers.
mControllers = new ArrayList<StateController>();
mControllers.add(new ConnectivityController(this)); // 注册监听网络连接状态的广播
mControllers.add(new TimeController(this)); // 用来控制截止时间和延迟时间对Job的约束，仅对设置了setOverrideDeadline()和setMinimumLatency()的Job有效
mControllers.add(new IdleController(this)); // 注册监听屏幕亮/灭,dream进入/退出,状态改变的广播
mBatteryController = new BatteryController(this); // 用来控制充电状态和低电量模式对Job的约束，仅仅对设置过setRequiresBatteryNotLow(true)或setRequiresCharging(true)的Job有效
mControllers.add(mBatteryController);
mStorageController = new StorageController(this); // 用来控制存储空间对Job的约束，仅仅对设置过setRequiresStorageNotLow(true)的Job有效
mControllers.add(mStorageController); // 其内部也是通过广播的形式获取设备是否处于低存储状态
mControllers.add(new BackgroundJobsController(this)); // BackgroundJobsController用来控制Job后台的运行。由于AppStandby机制，当应用处于后台时，会进行一些功能的限制
mControllers.add(new ContentObserverController(this)); // ContentObserverController用来监测content URIS对Job的约束，
// 仅仅对设置过addTriggerContentUri(Uri)的Job有效，当该URI发生变化后，将运行Job
mDeviceIdleJobsController = new DeviceIdleJobsController(this); // DeviceIdleJobsController用来控制Job对Doze的依赖条件，或者也可以说Doze对Job的限制
mControllers.add(mDeviceIdleJobsController);
}
图片来自Gityuan
持久化
/data/system/job/jobs.xml
<job jobid="1024" package="com.sunmi.toolbox" class="com.sunmi.toolbox.antirush.ScheduleService" sourcePackageName="com.sunmi.toolbox" sourceUserId="0" uid="10080" priority="0" flags="0" lastSuccessfulRunTime="0" lastFailedRunTime="0">
<constraints net-capabilities="94208" net-unwanted-capabilities="0" net-transport-types="0" />
<periodic period="900000" flex="300000" deadline="1590569023038" delay="1590568723038" />
<extras />
</job>
dumpsys jobscheduler package
JOB #u0a80/1024: e61d7bf com.sunmi.toolbox/.antirush.ScheduleService
u0a80 tag=*job*/com.sunmi.toolbox/.antirush.ScheduleService
Source: uid=u0a80 user=0 pkg=com.sunmi.toolbox
JobInfo:
Service: com.sunmi.toolbox/.antirush.ScheduleService
PERIODIC: interval=+15m0s0ms flex=+5m0s0ms
PERSISTED
Requires: charging=false batteryNotLow=false deviceIdle=false
Network type: NetworkRequest [ NONE id=0, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&VALIDATED Unwanted: Uid: 10080] ]
Backoff: policy=1 initial=+30s0ms
Has early constraint
Has late constraint
Required constraints: TIMING_DELAY DEADLINE CONNECTIVITY [0xd0000000]
Satisfied constraints: CONNECTIVITY DEVICE_NOT_DOZING BACKGROUND_NOT_RESTRICTED [0x12400000]
Unsatisfied constraints: TIMING_DELAY DEADLINE [0xc0000000]
Tracking: CONNECTIVITY TIME
Network: 100
Standby bucket: ACTIVE
Enqueue time: -1m42s81ms
Run time: earliest=+13m17s891ms, latest=+18m17s891ms
Last successful run: 2020-05-27 15:27:42
Last run heartbeat: 0
Ready: false (job=false user=true !pending=true !active=true !backingup=true comp=true)
总结
Android P JobScheduler服务源码解析-简书
