我可以为一个按钮设置两种不同的 onclick 方法吗

Question

我想知道一个按钮是否可以有两个 onclick 方法..我试图有一个按钮可以打开一个新的活动并向服务器发送一个 id 令牌以用于 firebase 目的，如果可能的话，我该怎么做安卓工作室

Answer 1

I think you are getting the underlying concept wrong.

Buttons react to clicks.

The "ActionListener" that gets triggered on that click ... can do whatever it wants. There is nothing (conceptually) that prevents you in your code to just trigger various things. Of course, you have to understand what you are doing (things like: not blocking the UI thread for too long; or how to kick of things in background threads, and so on).

Answer 2

It is one button and so you should apply only one onClick listener which performs the buttons job.

In your onClick-method you can just call another (private) method if you want to do multiple things without sacrificing code management.

button.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View view) {
        sendTokenToServer();
        // Include your code to open the activity here or outsource it again into another private method
    }
});

And your method to send the token to the server:

private void sendTokenToServer() {
    // Your code here.
}

Answer 3

No. There is only one onClick method for a Button. But you can still perform two different purposes by one button. I am using a button to hide and show a linear layout. The code is given below :

final int[] count = {2};
//here startTopics is the button....
 startTopics.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(count[0] %2==0)
                {
                    topicLin.setVisibility(View.VISIBLE);
                    count[0]++;
                }
                else
                {
                    topicLin.setVisibility(View.GONE); 
                                  //here topicLin is the linear layout
                    count[0]++;
                }

            }
        });