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我正在开发一个项目,该项目使用 firebase 作业调度程序来安排间隔运行的作业。但问题是,我在 android studio 模拟器上运行了代码,它运行得很好。作业已安排好,我收到了来自服务类的祝酒词,表明代码执行成功,但是我尝试在实时 android 手机上运行它,代码在设备上构建并运行,但从未安排过作业, 没有收到消息。我尝试了一切,但仍然没有调用 jobService 类。我尝试在模拟器上再次运行该应用程序,它运行良好,但它从未在我的实时设备上运行。请问这可能是什么原因。我将 firebase gradle 依赖项添加到 build.gradle 文件中。我将 jobService 添加到清单文件夹中。我不知道造成这种困境的原因是什么。请我需要一个解释。谢谢。

主要活动

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.firebase.jobdispatcher.Constraint;
import com.firebase.jobdispatcher.FirebaseJobDispatcher;
import com.firebase.jobdispatcher.GooglePlayDriver;
import com.firebase.jobdispatcher.Job;
import com.firebase.jobdispatcher.Lifetime;
import com.firebase.jobdispatcher.RetryStrategy;
import com.firebase.jobdispatcher.Trigger;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

import static android.R.attr.start;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    Button start_job, stop_job;
    private static final String Job_Tag = "myJobTag";
    private FirebaseJobDispatcher jobDispatcher;

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

        jobDispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(this));

        start_job = (Button) findViewById(R.id.start_job);
        stop_job = (Button) findViewById(R.id.stop_job);

        start_job.setOnClickListener(this);
        stop_job.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if(v.getId() == R.id.start_job){

            Job job = jobDispatcher.newJobBuilder()
                    .setService(MyFirebaseJobScheduler.class)
                    .setLifetime(Lifetime.FOREVER)
                    .setRecurring(true)
                    .setTag(Job_Tag)
                    .setTrigger(Trigger.executionWindow(1, 2))
                    .setRetryStrategy(RetryStrategy.DEFAULT_EXPONENTIAL)
                    .setReplaceCurrent(false)
                    .setConstraints(Constraint.ON_ANY_NETWORK)
                    .build();
            jobDispatcher.mustSchedule(job);
            Toast.makeText(this, "Job scheduled.", Toast.LENGTH_SHORT).show();

        }else if(v.getId() == R.id.stop_job){
            jobDispatcher.cancel(Job_Tag);
            Toast.makeText(this, "Job canceled.", Toast.LENGTH_SHORT).show();
        }
    }
}

工作服务类

import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;

import com.firebase.jobdispatcher.JobParameters;
import com.firebase.jobdispatcher.JobService;

public class MyFirebaseJobScheduler extends JobService {

    BackgroundScheduledTask backgroundScheduledTask;

    @Override
    public boolean onStartJob(final JobParameters jobParameters) {
        Log.d("JobDispatcher", "Job Called");
        backgroundScheduledTask = new BackgroundScheduledTask(){
            @Override
            protected void onPostExecute(String s) {
                Log.d("JobDispatcher", "PostExecute");
                Toast.makeText(getApplicationContext(), "Message from back task = "+s, Toast.LENGTH_LONG).show();
                jobFinished(jobParameters, false);
            }
        };
        backgroundScheduledTask.execute();
        return true;
    }

    @Override
    public boolean onStopJob(JobParameters jobParameters) {
        return false;
    }

    public static class BackgroundScheduledTask extends AsyncTask<Void, Void, String>{

        @Override
        protected String doInBackground(Void... params) {
            Log.d("JobDispatcher", "In background");
            return "Hello from background Job";
        }
    }
}

显现

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    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=".MyFirebaseJobScheduler"
        android:exported="false">
        <intent-filter>
            <action android:name="com.firebase.jobdispatcher.ACTION_EXECUTE"/>
        </intent-filter>
    </service>
</application>

构建.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "26.0.2"

    defaultConfig {
        applicationId "com.cyclon.server"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])

    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.firebase:firebase-jobdispatcher:0.5.2'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
}
4

2 回答 2

1

您已设置.setConstraints(Constraint.ON_ANY_NETWORK)这意味着它需要网络连接。如果您想在没有 Internet 连接的情况下启动服务,那么您必须在调度作业时 删除 .setConstraints(Constraint.ON_ANY_NETWORK) 。

于 2018-04-12T10:54:26.923 回答
0

如果它对某人有用,除了下面所有其他先前的答案之外,我报告我所经历的:对于相同的问题,具有完全相同的代码结构,在我的情况下,它是通过更改版本来解决的在 build.gradle 中导入的 firebase lib 到最近的一个。我有: implementation 'com.firebase:firebase-jobdispatcher:0.5.0' 然后我放了: implementation 'com.firebase:firebase-jobdispatcher:0.8.5' 可能最近的一个也一样。

于 2019-07-18T07:59:26.943 回答