Android Priority Job Queue (Job Manager)：多重不同Job并发执行并在前台获得返回结果（四）

在Android Priority Job Queue (Job Manager)中，如果两个或者若干多个完全不同的Job子任务并发执行，如何在前台获得返回结果呢？现在给出一个例子说明。
假设有两个完全不同的子任务JobA和JobB。当JobA任务完成后返回一个结果给前台回调，同样当任务JobB任务完成后返回一个结果给前台回调使用。
写两个Job：JobA和JobB。
JobA.java：

package zhangphil.app;

import android.os.SystemClock;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;

import com.birbit.android.jobqueue.Job;
import com.birbit.android.jobqueue.Params;
import com.birbit.android.jobqueue.RetryConstraint;

/**
 * Created by Phil on 2016/11/2.
 */

public class JobA extends Job {

    private String tag;

    private String result;

    public String getResult() {
        return result;
    }

    public JobA(String tag) {
        super(new Params(500).requireNetwork().persist().groupBy(tag));
        this.tag = tag;
        Log.d(tag, "构造");
    }

    @Override
    public void onAdded() {
        Log.d(tag, "onAdded");
    }

    @Override
    public void onRun() throws Throwable {
        Log.d(tag, "开始运行...");
        SystemClock.sleep(3000);
        result = tag + "的结果:" + System.currentTimeMillis();
        Log.d(tag, "完成:" + result);
    }

    @Override
    protected void onCancel(int cancelReason, @Nullable Throwable throwable) {

    }

    @Override
    protected RetryConstraint shouldReRunOnThrowable(@NonNull Throwable throwable, int runCount, int maxRunCount) {
        return null;
    }
}

JobB.java：

package zhangphil.app;

import android.os.SystemClock;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;

import com.birbit.android.jobqueue.Job;
import com.birbit.android.jobqueue.Params;
import com.birbit.android.jobqueue.RetryConstraint;

/**
 * Created by Phil on 2016/11/2.
 */

public class JobB extends Job {

    private String tag;

    private String result;

    public String getResult() {
        return result;
    }

    public JobB(String tag) {
        super(new Params(500).requireNetwork().persist().groupBy(tag));
        this.tag = tag;
        Log.d(tag, "构造");
    }

    @Override
    public void onAdded() {
        Log.d(tag, "onAdded");
    }

    @Override
    public void onRun() throws Throwable {
        Log.d(tag, "开始运行...");
        SystemClock.sleep(3000);
        result = tag + "的结果:" + System.currentTimeMillis();
        Log.d(tag, "完成:" + result);
    }

    @Override
    protected void onCancel(int cancelReason, @Nullable Throwable throwable) {

    }

    @Override
    protected RetryConstraint shouldReRunOnThrowable(@NonNull Throwable throwable, int runCount, int maxRunCount) {
        return null;
    }
}

前台回调获得结果：

package zhangphil.app;

import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import com.birbit.android.jobqueue.Job;
import com.birbit.android.jobqueue.JobManager;
import com.birbit.android.jobqueue.callback.JobManagerCallback;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        JobManager jobManager = MyApplication.getInstance().getJobManager();

        JobA a = new JobA("任务->A");
        JobA b = new JobA("任务->B");
        jobManager.addJobInBackground(a);
        jobManager.addJobInBackground(b);

        jobManager.addCallback(new JobManagerCallback() {
            @Override
            public void onJobAdded(@NonNull Job job) {

            }

            @Override
            public void onJobRun(@NonNull Job job, int resultCode) {

            }

            @Override
            public void onJobCancelled(@NonNull Job job, boolean byCancelRequest, @Nullable Throwable throwable) {

            }

            @Override
            public void onDone(@NonNull Job job) {
                if (job instanceof JobA) {
                    JobA a = (JobA) job;
                    Log.d("返回", a.getResult());
                }

                if (job instanceof JobB) {
                    JobB b = (JobB) job;
                    Log.d("返回", b.getResult());
                }
            }

            @Override
            public void onAfterJobRun(@NonNull Job job, int resultCode) {

            }
        });
    }
}

需要注意须用instanceof判断回调的实例是具体哪一个。

代码运行结果如图（添加关键词‘任务’过滤）：

关于MyApplication的配置和写法和附录文章4,5,6相同。

附录：
【1】《Java线程池：ExecutorService，Executors》链接地址：http://blog.csdn.net/zhangphil/article/details/43898637  
【2】《Java线程池及Future、Callable获得线程返回结果【Java线程池系列2】》链接地址：http://blog.csdn.net/zhangphil/article/details/49701219
【3】《Java线程池之FutureTask【Java线程池系列3】》链接地址：http://blog.csdn.net/zhangphil/article/details/49702751
【4】《Android Priority Job Queue (Job Manager)（一）》链接地址：http://blog.csdn.net/zhangphil/article/details/52777196
【5】《Android Priority Job Queue (Job Manager)：线程任务的容错重启机制（二）》链接地址：http://blog.csdn.net/zhangphil/article/details/52778525
【6】《 Android Priority Job Queue (Job Manager)：后台线程任务结果传回前台（三）》链接：http://blog.csdn.net/zhangphil/article/details/52787588