Service入门（二）——bindService、unbindService

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MainActivity.class文件：

package com.example.guocong.service;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.support.v7.app.AppCompatActivity;import android.view.View;public class MainActivity extends AppCompatActivity implements View.OnClickListener, ServiceConnection {    private Intent intent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //初始化intent        intent=new Intent(MainActivity.this,MyService.class);        //监听器的另一种实现方法：**implements实现接口**        findViewById(R.id.btnStartService).setOnClickListener(this);        findViewById(R.id.btnStopService).setOnClickListener(this);        findViewById(R.id.btnBindService).setOnClickListener(this);        findViewById(R.id.btnUnbindService).setOnClickListener(this);    }    //监听器接口的实现方法     @Override    public void onClick(View v) {     //使用switch语句，判断getId()方法得到id         switch(v.getId()){             case R.id.btnStartService:                 startService(intent);                 break;             case R.id.btnStopService:                 stopService(intent);                 break;             case R.id.btnBindService:                 bindService(intent,this, Context.BIND_AUTO_CREATE);                 break;             case R.id.btnUnbindService:                 break;         }    }    //服务绑定成功时执行    @Override    public void onServiceConnected(ComponentName name, IBinder service) {        System.out.println("Service Connected");    }    //程序销毁时执行    @Override    public void onServiceDisconnected(ComponentName name) {    }}

MyService文件：

package com.example.guocong.service;import android.app.Service;import android.content.Intent;import android.os.Binder;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.        //返回new Binder(),不然会闪退        return new Binder();    }    //执行onStartService时执行onStartService    @Override    public int onStartCommand(Intent intent, int flags, int startId) {            new Thread() {            //重写run()方法                @Override                public void run() {                    super.run();                    while(true) {                        System.out.println("服务正在运行");                        //为sleep添加try..catch语句                        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" />    <Button        android:text="绑定Service服务"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btnBindService" />    <Button        android:text="解除绑定Service服务"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btnUnbindService" /></LinearLayout>

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