在Android開發(fā)中跷坝，會存在這么些場景 : 你需要在稍后的某個時間點或者當滿足某個特定的條件時執(zhí)行一個任務
JobService介紹:This service executes each incoming job on a Handler running on your application's main thread. This means that you must offload your execution logic to another thread/handler/AsyncTask of your choosing. Not doing so will result in blocking any future callbacks from the JobManager - specifically onStopJob(android.app.job.JobParameters), which is meant to inform you that the scheduling requirements are no longer being met.
官方文檔：https://developer.android.com/reference/android/app/job/JobService.html
示例：在接收到開機廣播后延時5秒執(zhí)行任務
1.在mainfest中聲明：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sun.jobservicedemo">
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name="com.example.sun.jobservicedemo.BootReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
<category android:name="android.intent.category.HOME"/>
</intent-filter>
</receiver>
<service
android:name="com.example.sun.jobservicedemo.TestJobService"
android:permission="android.permission.BIND_JOB_SERVICE"/>
</application>
</manifest>
2.聲明廣播
package com.example.sun.jobservicedemo;
import android.app.job.JobInfo;
import android.app.job.JobScheduler;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.util.Log;
import android.widget.Toast;
import java.util.concurrent.TimeUnit;
/**
* Created by sun on 10/03/2018.
*/
public class BootReceiver extends BroadcastReceiver {
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
public void onReceive(Context context, Intent intent) {
Log.e("aaa","boot complete");
Toast.makeText(context,"boot complete", Toast.LENGTH_SHORT).show();
doService(context);
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void doService(Context context) {
JobScheduler jobScheduler = (JobScheduler) context.getSystemService(Context.JOB_SCHEDULER_SERVICE);
JobInfo.Builder builder = new JobInfo.Builder(1, new ComponentName(context, TestJobService.class)); //指定哪個JobService執(zhí)行操作
builder.setMinimumLatency(TimeUnit.MILLISECONDS.toMillis(5000)); //執(zhí)行的最小延遲時間
builder.setOverrideDeadline(TimeUnit.MILLISECONDS.toMillis(5010)); //執(zhí)行的最長延時時間
builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY); //任何網(wǎng)絡狀態(tài)
builder.setRequiresCharging(false); // 未充電狀態(tài)
jobScheduler.schedule(builder.build());
}
}
3.聲明JobService
package com.example.sun.jobservicedemo;
import android.app.job.JobParameters;
import android.app.job.JobService;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.util.Log;
import android.widget.Toast;
/**
* Created by sun on 10/03/2018.
*/
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public class TestJobService extends JobService{
@Override
public boolean onStartJob(JobParameters params) {
doJob();
jobFinished(params, false);
return true;
}
private void doJob() {
Log.e("aaa","5秒");
Toast.makeText(this,"5秒",Toast.LENGTH_LONG).show();
}
@Override
public boolean onStopJob(JobParameters params) {
return false;
}
@Override
public void onDestroy() {
super.onDestroy();
Log.e("aaa","service destory");
}
}
錯誤不足之處或相關建議歡迎大家評論指出卖宠，謝謝赠幕！如果覺得內(nèi)容可以的話麻煩喜歡（?）一下
