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Question

您好，我从此link中转介了Job Scheduler。当我要从活动按钮启动服务时，请单击“服务未启动”。我已经列出了代码。谁能帮我解决问题？

MainActivity

  package com.example.samplejobscheduler;
import androidx.appcompat.app.AppCompatActivity;
import android.app.job.JobInfo;
import android.app.job.JobScheduler;
import android.content.ComponentName;
import android.os.Bundle;
import android.util.Log;
import android.view.View; 

public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
    public void scheduleJob(View v) {
    ComponentName componentName = new ComponentName(this, MySchedulerService.class);
    JobInfo info = new JobInfo.Builder(123, componentName)
            .setRequiresCharging(true)
            .setRequiredNetworkType(JobInfo.NETWORK_TYPE_UNMETERED)
            .setPersisted(true)
            .setPeriodic(2 * 60 * 1000)
            .build();
    JobScheduler scheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
    int resultCode = scheduler.schedule(info);
    if (resultCode == JobScheduler.RESULT_SUCCESS) {
        Log.d(TAG, "Job scheduled");
    } else {
        Log.d(TAG, "Job scheduling failed");
    }
}
public void cancelJob(View v) {
    JobScheduler scheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
    scheduler.cancel(123);
    Log.d(TAG, "Job cancelled");
}}

MySchedulerService

public class MySchedulerService extends JobService {
private static final String TAG = "MySchedulerService";
private boolean jobCancelled = false;

@Override
public boolean onStartJob(JobParameters params) {
    Log.d(TAG, "Job started");
    doBackgroundWork(params);

    return true;
}

private void doBackgroundWork(final JobParameters params) {
    new Thread(new Runnable() {
        @Override
        public void run() {
            for (int i = 0; i < 10; i++) {
                Log.d(TAG, "run: " + i);
                if (jobCancelled) {
                    return;
                }

                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

            Log.d(TAG, "Job finished");
            jobFinished(params, false);
        }
    }).start();
}

@Override
public boolean onStopJob(JobParameters params) {
    Log.d(TAG, "Job cancelled before completion");
    jobCancelled = true;
    return true;
}}

activity_main

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    tools:context="com.example.samplejobscheduler.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="scheduleJob"
        android:text="Schedule Job" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="cancelJob"
        android:text="Cancel Job" />
</LinearLayout>

AndroidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.samplejobscheduler">

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

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

</manifest>

Answer 1

确保最小SDK为21或更高。

并且在清单中，我认为您不需要此许可：

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