[Android]Send Message To android.os.Handler的快速寫法

快速寫法:
mHandler.sendMessage(mHandler.obtainMessage(MSG_ADD_TO_PLAYLIST, intent));

其內部其實就是:

public final Message obtainMessage(int what, Object obj)
    {
        return Message.obtain(this, what, obj);
    }

public static Message obtain(Handler h, int what, Object obj) {

        Message m = obtain();

        m.target = h;

        m.what = what;

        m.obj = obj;

        return m;

    }