无法启动 onStartJob 方法

Question

我有以下代码：

MainActivity.java

package com.example.bluejob;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.job.JobInfo;
import android.app.job.JobScheduler;
import android.content.ComponentName;
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, BlueJobM.class);
        JobInfo info = new JobInfo.Builder(821, componentName)
                .setRequiresCharging(true)
                .setRequiredNetworkType(JobInfo.NETWORK_TYPE_UNMETERED)
                .setPersisted(true)
                .setPeriodic(15 * 60 * 1000)
                .build();


        JobScheduler scheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
        int resultCode;
         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(821);
        Log.d(TAG, "Job cancelled");
    }
}

BlueJobM.java

中的OnStartJob方法

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

        return true;
    }

当我在我的 Redmi 上启动代码时，我恢复了一系列错误：

2021-09-22 15:33:56.527 21306-21306/com.example.bluejob E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.bluejob, PID: 21306
    java.lang.IllegalStateException: Could not execute method for android:onClick
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:390)
        at android.view.View.performClick(View.java:6608)
        at android.view.View.performClickInternal(View.java:6585)
        at android.view.View.access00(View.java:785)
        at android.view.View$PerformClick.run(View.java:25921)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:201)
        at android.app.ActivityThread.main(ActivityThread.java:6810)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
     Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Method.invoke(Native Method)
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385)
        at android.view.View.performClick(View.java:6608) 
        at android.view.View.performClickInternal(View.java:6585) 
        at android.view.View.access00(View.java:785) 
        at android.view.View$PerformClick.run(View.java:25921) 
        at android.os.Handler.handleCallback(Handler.java:873) 
        at android.os.Handler.dispatchMessage(Handler.java:99) 
        at android.os.Looper.loop(Looper.java:201) 
        at android.app.ActivityThread.main(ActivityThread.java:6810) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873) 
     Caused by: java.lang.IllegalArgumentException: No such service ComponentInfo{com.example.bluejob/com.example.bluejob.BlueJobM}
        at android.os.Parcel.createException(Parcel.java:1957)
        at android.os.Parcel.readException(Parcel.java:1921)
        at android.os.Parcel.readException(Parcel.java:1871)
        at android.app.job.IJobScheduler$Stub$Proxy.schedule(IJobScheduler.java:184)
        at android.app.JobSchedulerImpl.schedule(JobSchedulerImpl.java:44)


       "I THINK THE ERROR IS HERE" at com.example.bluejob.MainActivity.scheduleJob(MainActivity.java:32)


        at java.lang.reflect.Method.invoke(Native Method) 
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385) 
        at android.view.View.performClick(View.java:6608) 
        at android.view.View.performClickInternal(View.java:6585) 
        at android.view.View.access00(View.java:785) 
        at android.view.View$PerformClick.run(View.java:25921) 
        at android.os.Handler.handleCallback(Handler.java:873) 
        at android.os.Handler.dispatchMessage(Handler.java:99) 
        at android.os.Looper.loop(Looper.java:201) 
        at android.app.ActivityThread.main(ActivityThread.java:6810) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873) 
     Caused by: android.os.RemoteException: Remote stack trace:
        at com.android.server.job.JobSchedulerService$JobSchedulerStub.enforceValidJobRequest(JobSchedulerService.java:2538)
        at com.android.server.job.JobSchedulerService$JobSchedulerStub.schedule(JobSchedulerService.java:2600)
        at android.app.job.IJobScheduler$Stub.onTransact(IJobScheduler.java:60)
        at android.os.Binder.execTransact(Binder.java:735)

当我启动应用程序时，我可以进入 CancelJob 方法，该方法在 BlueJobM.java 上正确调用 onStopJob（我可以看到日志）。当我删除这部分代码时 MainActivity.java

       int resultCode;
        resultCode = scheduler.schedule(info);
       if (resultCode == JobScheduler.RESULT_SUCCESS) {
           Log.d(TAG, "Job scheduled");
       } else {
           Log.d(TAG, "Job scheduling failed");
       }

错误未出现，但作业仍未启动。我怀疑该程序在构建作业时遇到了一些问题，但我不确定。

如果需要，我会在 Github 上添加更多代码 https://github.com/jaxis/BlueJob。

我正在学习本教程，因此代码应该与此类似 https://www.youtube.com/watch?v=3EQWmME-hNA&t。

提前致谢。

Answer 1

java.lang.IllegalArgumentException: No such service ComponentInfo{com.example.bluejob/com.example.bluejob.BlueJobM}

这意味着它对 class 作为组件一无所知。通常这意味着您没有将它添加到清单中。您要使用的每个服务和 Activity 都需要在清单中。在某些情况下 BroadcastReceivers 也是如此（尽管不是全部）。

无法启动 onStartJob 方法

impossible to start the onStartJob method

java

android

android-jobscheduler