public class MainActivity extends Activity {     Button bind, unbind, getServiceStatus;     // 保持所啟動的Service的IBinder物件     BindService.MyBinder binder;     // 定義一個ServiceConnection物件     private ServiceConnection conn = new ServiceConnection()     {         // 當該Activity與Service連線成功時回撥該方法         @Override         public void onServiceConnected(ComponentName name                 , IBinder service)         {             System.out.println("--Service Connected--");             // 獲取Service的onBind方法所返回的MyBinder物件             binder = (BindService.MyBinder) service;  // ①         }         // 當該Activity與Service斷開連線時回撥該方法         @Override         public void onServiceDisconnected(ComponentName name)         {             System.out.println("--Service Disconnected--");         }     };     @Override     public void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         // 獲取程式介面中的start、stop、getServiceStatus按鈕         bind = (Button) findViewById(R.id.bind);         unbind = (Button) findViewById(R.id.unbind);         getServiceStatus = (Button) findViewById(R.id.getServiceStatus);         // 建立啟動Service的Intent         final Intent intent = new Intent(this, BindService.class);

        bind.setOnClickListener(new OnClickListener()         {             @Override             public void onClick(View source)             {                 // 繫結指定Service                 bindService(intent, conn, Service.BIND_AUTO_CREATE);             }         });         unbind.setOnClickListener(new OnClickListener()         {             @Override             public void onClick(View source)             {                 // 解除繫結Service                 unbindService(conn);             }         });         getServiceStatus.setOnClickListener(new OnClickListener()         {             @Override             public void onClick(View source)             {                 // 獲取、並顯示Service的count值                 Toast.makeText(MainActivity.this,                         "Service的count值為：" + binder.getCount(),                         Toast.LENGTH_SHORT).show();  // ②             }         });     } }