android90 bind方式启动服务service调用service里的方法

package com.itheima.banzheng;

import com.itheima.banzheng.LeaderService.ZhouMi;

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

public class MainActivity extends Activity {

    private Intent intent;
    private MyServiceConn conn;
    PublicBusiness pb;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intent = new Intent(this, LeaderService.class);
        conn = new MyServiceConn();//服务连接对象，成功后就调用
        //绑定领导服务
        bindService(intent, conn, BIND_AUTO_CREATE);//执行这个代码后服务就成功的绑定了连接就建立了，连接后会调用LeaderService的onBind方法返回IBinder对象，
    }
    
    public void click(View v){
        //调用服务的办证方法
        pb.QianXian();//这样就可以调用LeaderService的banZheng方法，否则是不能调用LeaderService的banZheng方法的
    }

    class MyServiceConn implements ServiceConnection{//服务连接对象
        //连接服务成功（成功拿到中间人IBinder的ZhouMi对象），此方法调用
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //service就是中间人ZhouMi
            pb = (PublicBusiness) service;
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
        }
    }
}

Service：
package com.itheima.banzheng;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

public class LeaderService extends Service {

    @Override
    public IBinder onBind(Intent intent) {
        // 返回一个IBinder对象，这个对象就是MainActivity和LeaderService之间的中间人对象
        return new ZhouMi();//返回给了onServiceConnected的service参数
    }

    class ZhouMi extends Binder implements PublicBusiness{
        public void QianXian(){
            banZheng();
        }
        
        public  void daMaJiang(){
            System.out.println("陪李处打麻将");
        }
    }
    
    public void banZheng(){
        System.out.println("李处帮你来办证");
    }
}

package com.itheima.banzheng;

public interface PublicBusiness {

    void QianXian();
}

package com.itheima.musicplayer;

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

public class MainActivity extends Activity {

    MusicInterface mi;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent intent = new Intent(this, MusicService.class);
        //混合调用
        //为了把服务所在进程变成服务进程
        startService(intent);
        //为了拿到中间人对象
        bindService(intent, new MusicServiceConn(), BIND_AUTO_CREATE);
        //* 服务的混合调用
        //* 先开始、再绑定，先解绑、再停止
    }

    class MusicServiceConn implements ServiceConnection{
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mi = (MusicInterface) service;//返回中间人对象
        }
        @Override
        public void onServiceDisconnected(ComponentName name) {
        }
        
    }

    //开始播放按钮
    public void play(View v){//Activity的方法
        mi.play();//中间人的方法，调用Service的方法
    }
    //暂停播放按钮
    public void pause(View v){
        mi.pause();
    }
}
//清单文件： <service android:name="com.itheima.musicplayer.MusicService"></service>

package com.itheima.musicplayer;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

public class MusicService extends Service{
    @Override
    public IBinder onBind(Intent intent) {
        return new MusicController();//中间人对象
    }
    
    //必须继承binder，才能作为中间人对象返回给onServiceConnected的service
    class MusicController extends Binder implements MusicInterface{
        public void play(){
            MusicService.this.play();//中间人对象调用Service的方法
        }
        public void pause(){
            MusicService.this.pause();
        }
    }
    
    public void play(){//Service的方法
        System.out.println("播放音乐");
    }
    
    public void pause(){
        System.out.println("暂停播放");
    }

    
}

package com.itheima.musicplayer;

public interface MusicInterface {

    void play();
    void pause();
}