如何在一个时间限制内记录点击次数 [英] How to record number of clicks within a time limit

问题描述

我尝试制作一个应用程序，用户可以在20秒内点击一个按钮，并在结束时记录和显示总点击次数

程序既不会终止也不会执行



我尝试过：



私人TextView t1;

private Button btn;

private int count = 0;

private long startTime = System.currentTimeMillis（）;

private long endTime = System.currentTimeMillis（）+ 20000;



@Override

protected void onCreate（Bundle savedInstanceState）{

super.onCreate（savedInstanceState）;

setContentView（R.layout.activity_main）;



t1 =（TextView）findViewById（ R.id.textView）;

btn =（Button）findViewById（R.id.button）;



while（startTime<结束时间）

{

btn.setOnClickListen呃（新的View.OnClickListener（）

{



@Override

public void onClick（查看视图）

{

count = count + 1;

}

}）;

}

t1.setText（Integer.toString（count））;

}

I tried making an app where the user gets 20 seconds to click a button and at the end of the time the total number of clicks are recorded and displayed
The program is neither terminating nor executing

What I have tried:

private TextView t1;
private Button btn;
private int count = 0;
private long startTime = System.currentTimeMillis();
private long endTime = System.currentTimeMillis()+20000;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

t1 = (TextView)findViewById(R.id.textView);
btn = (Button)findViewById(R.id.button);

while(startTime < endTime)
{
btn.setOnClickListener(new View.OnClickListener()
{

@Override
public void onClick(View view)
{
count = count + 1;
}
});
}
t1.setText(Integer.toString(count));
}

推荐答案

while (startTime < endTime)

第一个问题：你要比较两个固定值，它们被初始化一次然后永远不会改变。



您将要用 System.currentTimeMillis（）替换 startTime 。

First problem: you're comparing two fixed values, which are initialized once and then never change.

You're going to want to replace startTime with System.currentTimeMillis().

btn.setOnClickListener(new View.OnClickListener() ... 

第二个问题：你'永远不要求代码终止。而是在一个紧凑的循环中一遍又一遍地添加一个新的点击处理程序。





一个简单的解决方案是添加处理程序一次，并检查 onClick 方法中的时间限制：

Second problem: you're never asking the code to terminate. Instead, you're adding a new "click" handler over and over again in a tight loop.


A simple solution would be to add the handler once, and check the time limit within the onClick method:

private TextView t1;
private Button btn;
private int count = 0;
private long endTime;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    endTime = System.currentTimeMillis() + 20000;
    t1 = (TextView)findViewById(R.id.textView);
    
    btn = (Button)findViewById(R.id.button);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (System.currentTimeMillis() < endTime) {
                count = count + 1;
                t1.setText(Integer.toString(count));
            }
        }
    });
} 

这篇关于如何在一个时间限制内记录点击次数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！