如何在更改 EditText 的文本时更改 TextView 的文本? [英] How to change TextView's text on change of EditText's text?

问题描述

我有一个 EditText 框，用户可以在其中输入内容.当用户输入文本时，我需要在 TextView (位于 EditText 下方)中显示输入文本.

I have an EditText box where the user can enter input. I need to display the input text in a TextView (which is placed below the EditText) while the user inputting the text.

示例:

如果用户在 EditText 框中输入任何字符，我需要在 TextView 中显示相同的字符.同样，如果用户从 EditText 中删除任何字符，我需要从 TextView 中删除相同的字符.(最终，我想在更改 EditText 的文本时更改 TextView 的文本).我希望我的要求现在很清楚.我怎样才能做到这一点?请指导我.

If the user is entering any characters in EditText box, I need to display the same characters in TextView. In the same way, If the user deletes any character from EditText, I need to remove the same character from TextView. (Ultimately, I want to change TextView's text on change of EditText's text). I hope my requirement is clear now. How can I achieve this? Please guide me.

推荐答案

将 TextWatcher 添加到您的 Edittext.在 afterTextChanged() 中进行操作.http://developer.android.com/reference/android/text/TextWatcher.html

Add TextWatcher to your Edittext. in afterTextChanged() do your operation. http://developer.android.com/reference/android/text/TextWatcher.html

TextWatcher inputTextWatcher = new TextWatcher() {
    public void afterTextChanged(Editable s) { 
                textview.setText(s.toString());
    }
    public void beforeTextChanged(CharSequence s, int start, int count, int after){
    }
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }
};

editText.addTextChangedListener(inputTextWatcher);

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