牛轧糖/奥利奥的JobScheduler [英] JobScheduler for Nougat/Oreo
问题描述
我遵循了一些有关android中的工作计划的在线教程，我尝试这样做，发现下面的代码编译没有错误.但是问题是onPostExecute/doInBackground返回消息中没有吐司.有什么需要的吗?就像我只是运行代码并放了些敬酒，并注意到myScheduler.schedule(myjobInfo);起作用，后台任务正在执行.
I followed some online tutorials about jobscheduling in android and I tried doing it and found out that the below code compiles without errors. But the problem is there is no toast from the onPostExecute/doInBackground return message. Is there anything that might be required? Its like I just run the code and placed some toasts and notice that myScheduler.schedule(myjobInfo); works, background tasks is carrying out.
我的gradle文件根本没有被触及
my gradle file is not touched at all
compileSdkVersion 26
defaultConfig {
applicationId "com.example.umarmalik.myapplication"
minSdkVersion 21
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
这是我的JobScheduler类
This is my JobScheduler class
public class MJobScheduler extends JobService {
private MJobExecutor executor;
@Override
public boolean onStartJob(final JobParameters params) {
executor = new MJobExecutor(){
@Override
protected void onPostExecute(String s) {
Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
jobFinished(params,true);
}
};
executor.execute();
return true;
}
@Override
public boolean onStopJob(JobParameters params) {
executor.cancel(true);
return false;
}
}
这是我的JobExecutor
This is my JobExecutor
public class MJobExecutor extends AsyncTask<Void,Void,String> {
@Override
protected String doInBackground(Void... voids) {
return "Background task running";
}
}
我的主要活动类别如下:
my Main activity class is as following:
public class MainActivity extends AppCompatActivity {
private static final int JOBID = 110;
private JobScheduler myScheduler;
private JobInfo myjobInfo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ComponentName myComp = new ComponentName(this,MJobScheduler.class);
JobInfo.Builder myBuilder = new JobInfo.Builder(JOBID,myComp);
myBuilder.setPeriodic(6000);
myBuilder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY);
myBuilder.setPersisted(true);
myScheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
myjobInfo = myBuilder.build();
myScheduler.schedule(myjobInfo);
}
}
我的清单
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<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=".MJobScheduler"
android:permission="android.permission.BIND_JOB_SERVICE"
android:exported="true" />
</application>
推荐答案
根据此答案，定期工作的最小可能时间为15分钟，这就是为什么它对您不起作用的原因. https://stackoverflow.com/a/48337856/5604896
According to this answer the minimum possible time for periodic job is 15 minutes, that's why it doesn't work for you. https://stackoverflow.com/a/48337856/5604896
完成作业后更新活动的更好方法是使用广播接收器.如果活动正在运行，则会收到通知.
The better approach to update activity when job finished is to use broadcast receiver. If activity is running it will be notified.
public class MJobScheduler extends JobService {
private MJobExecutor executor;
@Override
public boolean onStartJob(final JobParameters params) {
executor = new MJobExecutor(this, params);
executor.execute();
return true;
}
@Override
public boolean onStopJob(JobParameters params) {
executor.cancel(true);
return false;
}
private static class MJobExecutor extends AsyncTask<Void, Void, String> {
private WeakReference<JobService> jobServiceReference;
private JobParameters params;
MJobExecutor(JobService jobService, JobParameters params) {
jobServiceReference = new WeakReference<>(jobService);
this.params = params;
}
@Override
protected String doInBackground(Void... voids) {
return "Background task running";
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
JobService jobService = jobServiceReference.get();
if (jobService != null) {
Intent intent = new Intent("JOB_FINISHED");
intent.putExtra("result", s);
LocalBroadcastManager.getInstance(jobService).sendBroadcast(intent);
jobService.jobFinished(params, true);
}
}
}
}
以及您的活动:
public class MainActivity extends AppCompatActivity {
private static final int JOBID = 110;
private JobScheduler myScheduler;
private JobInfo myjobInfo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ComponentName myComp = new ComponentName(this, MJobScheduler.class);
JobInfo.Builder myBuilder = new JobInfo.Builder(JOBID, myComp);
myBuilder.setPeriodic(15 * 60 * 1000);
myBuilder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY);
myBuilder.setPersisted(true);
myScheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
myjobInfo = myBuilder.build();
myScheduler.schedule(myjobInfo);
LocalBroadcastManager.getInstance(this).registerReceiver(broadcastReceiver, new IntentFilter("JOB_FINISHED"));
}
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, intent.getStringExtra("result"), Toast.LENGTH_LONG).show();
}
};
@Override
protected void onDestroy() {
super.onDestroy();
LocalBroadcastManager.getInstance(this).unregisterReceiver(broadcastReceiver);
}
}
这篇关于牛轧糖/奥利奥的JobScheduler的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
