service初级：Activity与service间的联系、重写ServiceConnection

public class MainActivity extends Activity
{
    Mybinder mybinder =null;
    ServiceConnection mConn = new ServiceConnection()
    {
        @Override
        public void onServiceDisconnected(ComponentName name)
        {
                        
        }
                    
        @Override
        public void onServiceConnected(ComponentName name, IBinder binder)
        {
            mybinder = (Mybinder) binder;//对象binder，强转为Mybinder类型
            Log.e("MainActivity", "mybinder.getname()");
        }
    };
                
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
                    
        final TextView textView1 = (TextView) findViewById(R.id.textView1);
        final TextView textView2 = (TextView) findViewById(R.id.textView2);
                    
                    
        findViewById(R.id.button1).setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Intent intent = new Intent(MainActivity.this,MyService.class);
                            
                bindService(intent, mConn, BIND_AUTO_CREATE);
            }
        });
                    
        findViewById(R.id.button2).setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                unbindService(mConn);
            }
        });
                    
        findViewById(R.id.button3).setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                textView1.setText(mybinder.play());//通过mybinder调用service的方法,或者通过方法将数据传给service
            }
        });
                    
        findViewById(R.id.button4).setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                textView2.setText(mybinder.pause());
            }
        });
    }
                
    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
                
}

public class MyService extends Service
{
    public String play()
    {
        return "播放";
    }
    public String pause()
    {
        return "暂停";
    }
      
    class Mybinder extends Binder//Binder类继承了接口IBinder,Mybinder继承Binder类
    {
        //在Mybinder创建方法
        public String getname()
        {
            return "myBinder";
        }
          
        //调用外部方法
        public String play()
        {
            return MyService.this.play();
        }
        public String pause()
        {
            return MyService.this.pause();
        }
    }
      
    private IBinder binder = new Mybinder();//IBinder声明创建一个Mybinder对象
      
    @Override
    public IBinder onBind(Intent intent)
    {
        Log.e("MyService", "onBind");
        return binder;//返回IBinder对象
    }
      
    @Override
    public void onCreate()
    {
        Log.e("MyService", "onBind");
        super.onCreate();
    }
      
    @Override
    public boolean onUnbind(Intent intent)
    {
        Log.e("MyService", "onUnbind");
        return super.onUnbind(intent);
    }
      
    @Override
    public void onDestroy()
    {
        Log.e("MyService", "onDestroy");
        super.onDestroy();
    }
      
}