在Android中如何显示星号（*）代替点的EditText上有inputtype为textPassword？ [英] In android how to show asterisk (*) in place of dots in EditText having inputtype as textPassword?

问题描述

我想在星号（*）到位点的符号来显示的EditText 为 inputType 为 textPassword 。我碰到职位，要求使用 setTransformationMethod（）和实施 PasswordTransformationMethod 。但我这个类的，我需要实现以及如何显示星号哪种方法？有没有其他办法可以做到这一点？

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?

感谢

推荐答案

我觉得你应该通过<一个href="http://developer.android.com/reference/android/text/method/PasswordTransformationMethod.html#getTransformation%28java.lang.CharSequence,%20android.view.View%29">the文档。创建您的 PasswordTransformationMethod 类，并在 getTransformation（）的方法，只返回的字符串* 字符的长度相同的密码字段的内容。

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，并提出了为我工作的，使现场充满了 * 秒的匿名类。我将它转换成可用的类在这里：

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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