如何采取两种的EditText字段的值，进行简单的数学 [英] How to take the value of two EditText fields and perform simple mathematics

问题描述

我是新Android开发，并正在致力于用户在其中输入一个数字分成两个领域的EditText和$ P $一个简单的练习项目psses标记为计算的按钮和两个数字的总和显示。这里是code我到目前为止，但我不知道如何将两个字符串值，并将其输出添加到名为一个TextView场答案：

 公共无效calNumbers（查看视图）{
    文字的EditText =（EditText上）findViewById（R.id.edit_number1）;
    字符串值= text.getText（）的toString（）。    的EditText文本2 =（EditText上）findViewById（R.id.edit_number2）;
    字符串值2 = text2.getText（）的toString（）。    TextView的回答=（的TextView）findViewById（R.id.answer）;
}
 

解决方案

您必须将它们转换为数字（整型，浮点，长等），以preform你的算术。然后将结果转换回字符串在TextView中显示

  INT VAL1 =的Integer.parseInt（值）;
INT将val2 =的Integer.parseInt（值2）;answer.setText（将String.valueOf（VAL1 + val2中））;
 

I am new to Android development and am working on a simple practice project where the user enters a number into two EditText fields and presses a Button labeled "Calculate" and the sum of the two numbers is displayed. Here is the code I have so far, but I don't know how to add the two string values and output it to a TextView field named "answer":

public void calNumbers(View view) {
    EditText text = (EditText)findViewById(R.id.edit_number1);
    String value = text.getText().toString();       

    EditText text2 = (EditText)findViewById(R.id.edit_number2);
    String value2 = text2.getText().toString();              

    TextView answer = (TextView) findViewById(R.id.answer);      
}

解决方案

You'll have to convert them to numbers (int, float, long, etc) to preform your arithmetic. Then convert the result back to a String to display in a TextView

int val1 = Integer.parseInt(value);
int val2 = Integer.parseInt(value2);

answer.setText(String.valueOf(val1 + val2));

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