sevice入门

 

MainActivity

ackage com.example.zhangmeng.servicedemo;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {
    private Intent intent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        intent=new Intent(MainActivity.this,MyService.class);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        findViewById(R.id.button_StartService).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startService(intent);

            }
        });

        findViewById(R.id.button_StopService).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                stopService(intent);
            }
        });


    }
}

Service代码如下，一个程序中只可能有一个service

package com.example.zhangmeng.servicedemo;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.provider.Settings;

public class MyService extends Service {
    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
       new Thread(){
           @Override
           public void run() {
               super.run();
               while (true)
               {
                   System.out.println("The service is running!");
                   try {
                       sleep(1000);
                   } catch (InterruptedException e) {
                       e.printStackTrace();
                   }
               }
           }
       }.start();
        return super.onStartCommand(intent, flags, startId);
    }
}

MainActivity的xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.zhangmeng.servicedemo.MainActivity">


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="启动服务"
        android:id="@+id/button_StartService" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="停止服务"
        android:id="@+id/button_StopService" />

</LinearLayout>