开启服务、停止服务、绑定服务、取消绑定服务

package com.pingyijinren.test;

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

public class MyService extends Service {
    private DownloadBinder downloadBinder=new DownloadBinder();
    public MyService() {
    }

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

    @Override
    public void onCreate(){
        super.onCreate();
        Log.d("MainActivity","create");
    }

    @Override
    public int onStartCommand(Intent intent,int flags,int startId){
        Log.d("MainActivity","startCommand");
        return super.onStartCommand(intent,flags,startId);
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        Log.d("MainActivity","destroy");
    }

    class DownloadBinder extends Binder {
        public void startDownload(){
            Log.d("MainActivity","startDownload");
        }

        public int getProgress(){
            Log.d("MainActivity","getProgress");
            return 0;
        }
    }
}

package com.pingyijinren.test;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity{
    private Button bindService;
    private Button cancelBindService;
    private MyService.DownloadBinder downloadBinder;
    private ServiceConnection serviceConnection=new ServiceConnection(){
        @Override
        public void onServiceDisconnected(ComponentName name){}

        @Override
        public void onServiceConnected(ComponentName name, IBinder service){
            downloadBinder=(MyService.DownloadBinder)service;
            downloadBinder.startDownload();
            downloadBinder.getProgress();
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        bindService=(Button)findViewById(R.id.bindService);
        cancelBindService=(Button)findViewById(R.id.cancelBindService);

        bindService.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,MyService.class);
                bindService(intent,serviceConnection,BIND_AUTO_CREATE);
                startService(intent);
            }
        });

        cancelBindService.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                unbindService(serviceConnection);
                Intent intent=new Intent(MainActivity.this,MyService.class);
                stopService(intent);
            }
        });
    }
}