Service入门（一）——startService、stopService

MainActivity.class文件：

package com.example.guocong.service;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        findViewById(R.id.btnStartService).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startService(new Intent(MainActivity.this,MyService.class));            }        });        findViewById(R.id.btnStopService).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                stopService(new Intent(MainActivity.this,MyService.class));            }        });    }}

MyService文件：

package com.example.guocong.service;import android.app.Service;import android.content.Intent;import android.os.IBinder;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");    }    //执行onStartService时执行onStartService    @Override    public int onStartCommand(Intent intent, int flags, int startId) {            new Thread() {                @Override                public void run() {                    super.run();                    while(true) {                        System.out.println("服务正在运行");                        try {                            sleep(1000);                        } catch (InterruptedException e) {                            e.printStackTrace();                        }                    }                }            }.start();        return super.onStartCommand(intent, flags, startId);    }}

Activity.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:id="@+id/activity_main"    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"    tools:context="com.example.guocong.service.MainActivity"    android:orientation="vertical"    >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!" />    <Button        android:text="启动Service服务"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btnStartService" />    <Button        android:text="停止Service服务"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btnStopService" />LinearLayout>

可通过模拟器的setting/APP/Running目录查看后台正在运行程序；startActivity用于创建Service,stopService用于销毁Service。

补充一下：MainActivity文件中的Intent也可以这样写：

    private Intent intent;     //初始化intent   intent=new Intent(MainActivity.this,MyService.class);        findViewById(R.id.btnStartService).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startService(intent);            }        });        findViewById(R.id.btnStopService).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                stopService(intent);            }        });

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