有没有办法在 Android 中为 EditText 定义最小值和最大值? [英] Is there a way to define a min and max value for EditText in Android?

问题描述

我想为 EditText 定义一个最小值和最大值.

例如:如果有人试图在其中输入月份值，则该值必须在 1-12 之间.

我可以通过使用 TextWatcher 来做到这一点，但我想知道是否还有其他方法可以在布局文件或其他地方做到这一点.

我不想限制字符数.我想限制价值.例如，如果我在输入 12 时限制月份 EditText w 个字符，它将接受它，但如果我输入 22，它在我输入时不能接受它.

解决方案

首先创建这个类:

package com.test;导入 android.text.InputFilter;导入 android.text.Spanned;公共类 InputFilterMinMax 实现 InputFilter {私有整数最小值，最大值；公共 InputFilterMinMax(int min, int max) {this.min = 分钟；this.max = 最大值；}公共 InputFilterMinMax(String min, String max) {this.min = Integer.parseInt(min);this.max = Integer.parseInt(max);}@覆盖公共 CharSequence 过滤器(CharSequence 源，int start，int end，spanned dest，int dstart，int dend){尝试 {int input = Integer.parseInt(dest.toString() + source.toString());if (isInRange(min, max, input))返回空；} catch (NumberFormatException nfe) { }返回 "";}私有布尔值 isInRange(int a, int b, int c) {返回 b >一种 ?c >= a &&c <= b : c >= b &&c <= a;}}

然后从您的活动中使用它:

EditText et = (EditText) findViewById(R.id.myEditText);et.setFilters(new InputFilter[]{ new InputFilterMinMax("1", "12")});

这将允许用户输入仅从 1 到 12 的值.

使用 android:inputType="number" 设置您的编辑文本.

您可以在 https://www.techcompose.com/how-to-set-minimum-and-maximum-value-in-edittext-in-android-app-development/.>

谢谢.

I want to define a min and max value for an EditText.

For example: if any person tries to enter a month value in it, the value must be between 1-12.

I can do it by using TextWatcher but I want to know if there is any other way to do it in layout file or elsewhere.

Edit: I don't want to limit character count. I want to limit the value. For example, if I limit month EditText w characters when I enter 12 it will accept it but if I enter 22 it mustn't accept it while I am entering.

解决方案

First make this class :

package com.test;

import android.text.InputFilter;
import android.text.Spanned;

public class InputFilterMinMax implements InputFilter {

    private int min, max;

    public InputFilterMinMax(int min, int max) {
        this.min = min;
        this.max = max;
    }

    public InputFilterMinMax(String min, String max) {
        this.min = Integer.parseInt(min);
        this.max = Integer.parseInt(max);
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {   
        try {
            int input = Integer.parseInt(dest.toString() + source.toString());
            if (isInRange(min, max, input))
                return null;
        } catch (NumberFormatException nfe) { }     
        return "";
    }

    private boolean isInRange(int a, int b, int c) {
        return b > a ? c >= a && c <= b : c >= b && c <= a;
    }
}

Then use this from your Activity :

EditText et = (EditText) findViewById(R.id.myEditText);
et.setFilters(new InputFilter[]{ new InputFilterMinMax("1", "12")});

This will allow user to enter values from 1 to 12 only.

EDIT :

Set your edittext with android:inputType="number".

You can find more details at https://www.techcompose.com/how-to-set-minimum-and-maximum-value-in-edittext-in-android-app-development/.

Thanks.

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