如何使用jobcheduler将工作项目排入队列

Question

Android中的JobWorkItem几乎没有互联网上的例子。

尝试在Android中将工作添加到作业（使用JobScheduler框架）。但我对JobWorkItem的意图从未解雇过。试图使用this方法是特别的。我注意到我的服务中的断点（JsonDownloadIntentService）从未被命中。

MainActivity.java

private void startJobService() {
        JobScheduler jobScheduler = (JobScheduler) getApplicationContext().getSystemService(Context.JOB_SCHEDULER_SERVICE);
        jobScheduler.schedule(getJobInfo());
    }

    private JobInfo getJobInfo() {
        if(jobInfo == null) {
           jobInfo =  (new JobInfo.Builder(10, new ComponentName(getApplicationContext().getPackageName(), EmptyJobService.class.getName()))).setMinimumLatency(0).setOverrideDeadline(5000).build();
        }
        return jobInfo;
    }

    private void enqueueWorkItem() {
        Intent startJsonDownloadService = new Intent(this, JsonDownloadIntentService.class);
        ((JobScheduler)getApplicationContext().getSystemService(Context.JOB_SCHEDULER_SERVICE)).enqueue(getJobInfo(), new JobWorkItem(startJsonDownloadService));
    }

empty job service.Java

        public class EmptyJobService extends JobService {
        @Override
        public boolean onStartJob(JobParameters params) {
            Log.d(Constants.JOB_SERVICE, "Job Service started");
            Toast.makeText(getApplicationContext(), "", Toast.LENGTH_SHORT).show();
            return false;
        }

        @Override
        public boolean onStopJob(JobParameters params) {
            Log.d(Constants.JOB_SERVICE, "Job service stopped");
            return false;
        }
}

AndroidManifest.xml中

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.viewer.myphotoviewer">
    <uses-permission android:name="android.permission.INTERNET" />
   <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=".PhotoGalleryActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".ImageDownloadIntentService" />
        <service android:name=".JsonDownloadIntentService" />
        <service android:name=".EmptyJobService"
            android:permission="android.permission.BIND_JOB_SERVICE"
            android:exported="true"
            />

        <activity android:name=".ImageViewActivity"></activity>
    </application>
</manifest>

Answer 1

它是否在清单中声明，并获得许可？

<service
android:name=".MyJobService"
android:permission="android.permission.BIND_JOB_SERVICE"/>