Question

android的Handler中sendEmptyMessage与sendMessage的区别？

Answer 1

sendMessage()允许你处理Message对象(Message里可以包含数据,)。
sendEmptyMessage()只能放数据

Answer 2

是一样的
public final boolean sendMessage(Message msg)
{
return sendMessageDelayed(msg, 0);
}

public final boolean sendEmptyMessage(int what)
{
return sendEmptyMessageDelayed(what, 0);
}
public final boolean sendEmptyMessageDelayed(int what, long delayMillis) {
Message msg = Message.obtain();
msg.what = what;
return sendMessageDelayed(msg, delayMillis);
}

Answer 3

sendEmptyMessage 不带附加数据。