在android中如何显示星号(*)代替EditText中的点，输入类型为textPassword? [英] In android how to show asterisk (*) in place of dots in EditText having inputtype as textPassword?

问题描述

我试图用 asterisk (*) 符号代替 EditText 中的点，其中 inputType 为 textPassword.我遇到了要求使用 setTransformationMethod() 并实现 PasswordTransformationMethod 的帖子.但是我需要实现该类的哪个方法以及如何显示星号?还有其他方法吗?

I am trying to show in asterisk (*) symbol in place of dots in EditText having inputType as textPassword. I came across post that ask to use setTransformationMethod() and implement PasswordTransformationMethod. But which method I of that class need I implement and how show asterisk? Is there other way to do that?

谢谢

推荐答案

我觉得你应该通过文档.创建你的 PasswordTransformationMethod 类，并在 getTransformation() 方法中，只返回与内容长度相同的 * 字符串您的密码字段.

I think you should go through the documentation. Create your PasswordTransformationMethod class, and in the getTransformation() method, just return a string of * characters that is the same length as the contents of your password field.

我做了一些摆弄，想出了一个匿名类，它可以让我创建一个充满 * 的字段.我在这里将其转换为可用的类:

I did some fiddling and came up with an anonymous class that worked for me to make a field full of *s. I converted it into a usable class here:

public class MyPasswordTransformationMethod extends PasswordTransformationMethod {
    @Override
    public CharSequence getTransformation(CharSequence source, View view) {
        return new PasswordCharSequence(source);
    }

    private class PasswordCharSequence implements CharSequence {
        private CharSequence mSource;
        public PasswordCharSequence(CharSequence source) {
            mSource = source; // Store char sequence
        }
        public char charAt(int index) {
            return '*'; // This is the important part
        }
        public int length() {
            return mSource.length(); // Return default
        }
        public CharSequence subSequence(int start, int end) {
            return mSource.subSequence(start, end); // Return default
        }
    }
};

// Call the above class using this:
text.setTransformationMethod(new MyPasswordTransformationMethod());

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