从字符串机器人清除值 [英] clear a value from a string android

问题描述

我有一个应用程序，让你点击按钮加减+5或-5和+1或-1从20起始值我有它设置，使一个按钮被点击时就会把这些值到字符串并显示它，使得用户可以看到他们有pressed的历史。我有一个方法调用复位（）;一个重置初始值回20，我想知道怎么也清除字符串值

  add5.setOnClickListener（新View.OnClickListener（）{    @覆盖
    公共无效的onClick（视图v）{
        // TODO自动生成方法存根
        计数器+ = 5;
        updateDisplay（）;        //添加点击历史P1
        字符串tmText =（字符串）BTN pressedTV.getText（）;
        BTN pressedTV.setText（tmText +\\ n+将String.valueOf（计数器））;
    }
}）;sub5.setOnClickListener（新View.OnClickListener（）{    @覆盖
    公共无效的onClick（视图v）{
        // TODO自动生成方法存根
        计数器 -  = 5;
        updateDisplay（）;        //添加点击历史P1
        字符串tmText =（字符串）BTN pressedTV.getText（）;
        BTN pressedTV.setText（tmText +\\ n+将String.valueOf（计数器））;
    }
}）;    无效复位（）{
    // TODO自动生成方法存根
    计数器= 20;
    display.setText（将String.valueOf（20））;
    display.setTextColor（Color.BLACK）;
    tmText =;}
 

解决方案

试试这个..

使用您的字符串 tmText 在全球像的下方，像您的整数 计数

 字符串tmText;
INT计数器;
 

和重置 方式

 公共无效复位（）
{
    tmText =;
    计数器= 20;
}
 

I have an app that lets you click buttons to add and subtract +5 or -5 and +1 or -1 from a starting value of 20. I have it set up so that when a button is clicked it will put that value into a string and display it so that the user can see a history of what they have pressed. I have a method called reset(); that resets the starting value back to 20, I would like to know how to also clear the string values

add5.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        counter += 5;
        updateDisplay();

        // add the click history for p1
        String tmText = (String) btnPressedTV.getText();
        btnPressedTV.setText(tmText + "\n" + String.valueOf(counter));
    }
});

sub5.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        counter -= 5;
        updateDisplay();

        // add the click history for p1
        String tmText = (String) btnPressedTV.getText();
        btnPressedTV.setText(tmText + "\n" + String.valueOf(counter));
    }
});

    void reset() {
    // TODO Auto-generated method stub
    counter = 20;
    display.setText(String.valueOf(20));
    display.setTextColor(Color.BLACK);
    tmText = ""; 

}

解决方案

Try this..

Use your String tmText in Global like below and as like your integer counter

String tmText;
int counter;

and reset method

public void reset()  
{
    tmText = ""; 
    counter = 20; 
}

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