Android JobScheduler onStopJob没有被调用

Question

我已经为JobScheduler实现了一个演示应用程序。以下是我的MainActivity和JobScheduler服务代码。即使我按取消所有任务按钮取消所有预定作业，也不会调用OnStopJob。我无法理解为什么会这样。我也试过从onStopJob返回true。

MainActivity.java

package com.example.jobschedulerdemo;

import android.app.Activity;
import android.app.job.JobInfo;
import android.app.job.JobScheduler;
import android.content.ComponentName;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
    private JobScheduler mJobScheduler;
    private Button mScheduleJobButton;
    private Button mCancelAllJobsButton;
    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mScheduleJobButton = (Button) findViewById( R.id.schedule_job );
        mCancelAllJobsButton = (Button) findViewById( R.id.cancel_all );
        mJobScheduler = (JobScheduler) getSystemService(Context.JOB_SCHEDULER_SERVICE);
        mScheduleJobButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                JobInfo.Builder jobBuilder = new JobInfo.Builder(1, new ComponentName(getPackageName(), TestJobService.class.getName()));
                jobBuilder.setPeriodic(3000);
                jobBuilder.setRequiresCharging(true);
                if(mJobScheduler.schedule(jobBuilder.build()) <= 0){
                    Log.i(TAG, "Error in scheduling job");
                }
            }
        });

        mCancelAllJobsButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                mJobScheduler.cancelAll();
            }
        });
    }

}

TestJobService.java

package com.example.jobschedulerdemo;

import android.app.job.JobParameters;
import android.app.job.JobService;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Toast;

public class TestJobService extends JobService{
    private static final String TAG = "TestJobService";

    private Handler mHandler = new Handler(new Handler.Callback() {

        @Override
        public boolean handleMessage(Message msg) {
            Toast.makeText(TestJobService.this, "Task Running", Toast.LENGTH_SHORT).show();
            jobFinished((JobParameters)msg.obj, false);
            return false;
        }
    });

    @Override
    public boolean onStartJob(JobParameters params) {
        Log.i(TAG, "onJobStarted : Job Id = " + params.getJobId());
        mHandler.sendMessage(Message.obtain(mHandler, 1, params));
        return true;
    }

    @Override
    public boolean onStopJob(JobParameters params) {
        Log.i(TAG, "onStopJob : Job Id = " + params.getJobId());
        mHandler.removeMessages(1);
        return false;
    }
}

Answer 1

当收到取消请求时，系统使用

onStopJob（JobParameters params）取消待处理的任务。

您可以通过运行作业轻松地重现它并将其取消 BEFORE 结束（在调用jobFinished（...）之前）。它假设您放置了取消后台任务所需的逻辑。

3秒可能太短而无法进行测试。尝试更多时间。