首先写个类继承Service 在清单文件中注册
Activity与服务连接 重写onBinder 方法

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<service android:name=".BindService">

    </service>

···
布局文件xml
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<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:orientation="vertical"
tools:context="{relativePackage}.{activityClass}" >

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="bind开启服务"
    android:onClick="start"
     />
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="bind关闭服务" 
    android:onClick="stop"
    
    />
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="调用服务的方法" 
    
    android:onClick="method"
    />

</LinearLayout>

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*************MainActivity中*************
···
package com.example.test23_bindsecevice;

import com.example.test23_bindsecevice.BindService.MyBinder;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;

public class MainActivity extends Activity {
private MyConnection conn;
MyBinder myBinder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onDestroy() {
super.onDestroy();
//把service关闭 解除跟当前Activiy的绑定
unbindService(conn);

}
public void start(View v){
     Intent service = new Intent(this,BindService.class);
     //通过绑定的方式开启service
      conn = new MyConnection();
      //使用bindService 开启反服务
      //参数 1. intent 包含要启动的service
      //2.   ServiceConnection接口 通过它可以接受服务开启或者停止的消息
      //3.开启服务时操作的选项 一般传入BIND_AUTO_CREATE自动创建service
     bindService(service, conn, BIND_AUTO_CREATE);//绑定存在自动创建
     
     
}
public void stop(View v){
    //使用bindService开启服务  要是用unbindService停止
    unbindService(conn);
}
public void method(View v){

//BindService service = new BindService();
// service.showToast("12112");
myBinder.method("dfdg");
myBinder.showToast2("4512") ;

}
private class MyConnection implements ServiceConnection{
    
    @Override//当服务与Activity 连接时建立
    public void onServiceConnected(ComponentName name, IBinder service) {
        //只有当service onbind方法返回值不为null 调用
        Log.e("TAG", "onServiceConnected");
         myBinder=(MyBinder) service;
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        Log.e("TAG", "onServiceDisconnected");
        
    }
    
}

}

···
Service中*********************
···
package com.example.test23_bindsecevice;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class BindService extends Service{

@Override
public IBinder onBind(Intent intent) {
  Log.e("TAG", "onBind");
    return new MyBinder();
}

@Override
public void onCreate() {
Log.e("TAG", "onBind");
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e("TAG", "onStartCommand");
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
Log.e("TAG", "onDestroy");
super.onDestroy();
}
public void showToast(String s){
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
}
public class MyBinder extends Binder{
public void method(String s){
showToast(s);
}
public void showToast2(String s){
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
}
}
}

···