在后台永久运行服务-Android [英] Running a Service forever in background - Android

问题描述

我已经在Android应用程序中创建了 Service ，该服务会通过 BroadcastReceiver 在 BOOT_COMPLETE 上自动启动.那工作得很好.但是此服务仅执行一次在 onCreate()方法中定义的任务.另一方面，我想永远在后台运行 Service .实际上，在 onCreate()方法内部，我正在从数据库中读取数据，并在需要时生成通知.而且通知可以随时生成，因此我想永远运行我的服务.我是Android的新手，我已经看到了一些示例&教程，但他们没有帮助.请回答我如何永远运行我的 Service .

I have created a Service in my android application which starts automatically on BOOT_COMPLETE through BroadcastReceiver. And That is working perfectly fine. But this service performs the task that I have define inside onCreate() method, only once. On the Other hand I want to run the Service forever in background. Actually inside onCreate() method I am reading data from my database and I am generating notifications if required. And the notifications can be generated any time, so therefore I want to run my service forever. I am new to Android, and I have seen may examples & tutorial but they did not helped. So kindly Answer that how can I run my Service forever.

这是服务代码:

package com.example.abc.project1;

import android.app.*;
import android.content.Intent;
import android.os.IBinder;
import android.util.*;
import org.json.*;
import java.io.*;
import java.net.*;
import java.util.*;


public class HelloService extends Service {

    private static final String TAG = "HelloService";
    public static boolean isRunning  = false;

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }


    @Override
    public void onCreate() {
        isRunning = true;
        new Thread(new Runnable() {
            @Override
            public void run() {
                /*Here I want to do my task forever (reading from database & generate notifications)*/
            }
        }).start();
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return Service.START_STICKY;
    }

    @Override
    public void onDestroy() {
        isRunning = false;
    }

}

这是BroadcastReceiver的代码

package com.example.abc.project1;

import android.content.*;
import android.util.Log;

public class MyBroadcastreceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent startServiceIntent = new Intent(context, HelloService.class);
        context.startService(startServiceIntent);
    }
}

这是AndroidManifest.xml的一部分

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.abc.project1">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.providers.gef.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_COARSE_CATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />

        <service android:name=".HelloService"></service>

        <receiver android:name="com.example.abc.project1.MyBroadcastreceiver" android:enabled="true" android:exported="false">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.PACKAGE_REPLACED" />
                <data android:scheme="package" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.PACKAGE_ADDED" />
                <data android:scheme="package" />
            </intent-filter>
        </receiver>

    </application>

</manifest>

推荐答案

这非常简单.
步骤:
1.创建一个服务类.
2.创建一个 BroadcastReceiver 类
3.使用 onDestroy 服务方法
呼叫 BroadReceiver 4.再次在 BroadReceiver 类的 onReceive 方法中启动服务.
引用此链接

It is very simple.
steps:
1.create a Service class.
2.create a BroadcastReceiver class
3.call BroadReceiver in onDestroy method of service
4.In onReceive method of BroadReceiver class start service once again.
refer this link

这篇关于在后台永久运行服务-Android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！