android service绑定Activity注意

1.Activity绑定Service语句最好写在onCreat（）中，绑定后会直接调用onServiceConnected方法，可以将执行语句写在该方法中。

private ServiceConnection trackcon = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
TrackBinder myBinder = (TrackBinder) service;
trackService = myBinder.getService();
Timer updateTimer = new Timer("trackService");
updateTimer.scheduleAtFixedRate(new TimerTask() {
public void run() {
handler.post(trackRunnable);
}
}, 0, 150);
}
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
trackService = null;
}
};

2.将执行语句放在onstart中时导致空指针，不知道原因……可将其放在按钮等的处理程序中。