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Android Jetpack WorkManager 设置退避策略


退避策略就是当返回retry的时候 多少s后重新尝试

package com.anguomob.jecpack.work

import android.content.Context
import android.os.SystemClock
import android.util.Log
import androidx.annotation.NonNull
import androidx.work.Worker
import androidx.work.WorkerParameters

class MyWork(val context: Context, val workerParameters: WorkerParameters) :
Worker(context, workerParameters) {
private val TAG = "MyWork"
override fun doWork(): Result {
SystemClock.sleep(2000);
Log.d(TAG, "MyWork doWork: ${System.currentTimeMillis()}")
return Result.retry()
}
}

返回       return Result.retry()

package com.anguomob.jecpack.activity

import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import androidx.work.*
import com.anguomob.jecpack.R
import com.anguomob.jecpack.work.MyWork
import java.time.Duration
import java.util.concurrent.TimeUnit

class WorkManagerActivity : AppCompatActivity() {
private val TAG = "WorkManagerActivity"
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_work_manager)
}

fun addWork(view: View) {
//触发条件
val tempConstraints = Constraints.Builder()

// if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
// tempConstraints //在待机状态下执行 需要api级别最低为23
// .setRequiresDeviceIdle(true)
// }
//不计费网络 如wifi
// NetworkType.UNMETERED
//非漫游
// NetworkType.NOT_ROAMING
//计费网络 如3g 4g
// NetworkType.METERED
//当网络连接上 可能要过几分钟才可以行
// .setRequiredNetworkType(NetworkType.CONNECTED)
//对网络不强制要求 很快就可以执行
val constraints = tempConstraints.setRequiredNetworkType(NetworkType.NOT_REQUIRED)
//不在电量不足的执行
// .setRequiresBatteryNotLow(true)
// //在充电的时候执行
// .setRequiresCharging(true)
// //不在存储量不足的时候执行
// .setRequiresStorageNotLow(true)
.build()


//配置任务
// 一次性执行的任务
val tempMyWork = OneTimeWorkRequest.Builder(MyWork::class.java)
//设置触发条件
.setConstraints(constraints)
//设置延迟5s后执行
.setInitialDelay(5, TimeUnit.SECONDS)

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
//线性增长 一开始2s 后面4s 8s 16s
tempMyWork.setBackoffCriteria(BackoffPolicy.LINEAR, Duration.ofSeconds(2))
}
//设置tag
tempMyWork.addTag("WorkRequest1")

val work = tempMyWork.build();

//任务提交给WorkManager
val workManager = WorkManager.getInstance(this);
//将任务添加到队列当中
workManager.enqueue(work)

//观察任务
workManager.getWorkInfoByIdLiveData(work.id).observe(this, { workInfo: WorkInfo ->
Log.e(TAG, "addWork:M ")

})
}
}

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
//线性增长 一开始2s 后面4s 8s 16s
tempMyWork.setBackoffCriteria(BackoffPolicy.LINEAR, Duration.ofSeconds(2))
}

任务会慢慢执行 线性的慢慢 具体的时间我也不好说 但是是线性的

Android Jetpack WorkManager 设置退避策略_android

 

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