如何在更改EditText文本时更改TextView的文本？

Question

我有一个EditText框,用户可以在其中输入输入.我需要在用户输入文本时在TextView(位于Edittext下面)中显示输入文本.
对于Ex: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editetext中删除任何字符,我需要从TextView中删除相同的字符.(Ultimtely,我想更改textview的文本更改的文本).我希望我的要求现在很清楚.我怎样才能实现这一目标？请指导我

Answer 1

将TextWatcher添加到Edittext.在afterTextChanged()做你的操作. 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);

Answer 2

你应该覆盖这个方法：

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

    }

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

    }

    @Override
    public void afterTextChanged(Editable s) {
        if(editText.getText().length() >= 0) {
            textView.setText(editText.getText().toString())
        } 
    }
});

Answer 3

edtText.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
                if (!edtText.getText().toString().equalsIgnoreCase("")){

                    // here textview.setText(edtText.getText());

                }
            }
        });
    }