如何在 Android 中使用 TextWatcher 类? [英] How to use the TextWatcher class in Android?

问题描述

谁能告诉我如何屏蔽 EditText 中的 substring 或如何更改 EditText 子字符串输入到密码类型 或 替换 另一个字符 像这样 123xxxxxxxxx3455

Can anyone tell me how to mask the substring in EditText or how to change EditText substring input to password type or replace by another character like this 123xxxxxxxxx3455

 String contents = et1.getText().toString();
 et1.setText(contents.replace.substring(0, contents.length()-2),"*");

请告诉我如何在 Android 中使用 TextWatcher 方法.

Please, tell me how I can use the TextWatcher method in Android.

推荐答案

用于TextWatcher...

et1.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

        // TODO Auto-generated method stub
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        // TODO Auto-generated method stub
    }

    @Override
    public void afterTextChanged(Editable s) {

        // TODO Auto-generated method stub
    }
});

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