TextView文本如何與輸入框聯(lián)動

要實現(xiàn)TextView文本與輸入框聯(lián)動，可以使用TextWatcher監(jiān)聽輸入框的文本變化，然后將輸入的文本設(shè)置到TextView中。以下是一個簡單的示例代碼：

EditText editText = findViewById(R.id.editText);
TextView textView = findViewById(R.id.textView);

editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // This method is called to notify you that, within s, the count characters beginning at start are about to be replaced by new text with length after.
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // This method is called to notify you that, within s, the count characters beginning at start have just replaced old text that had length before.
        textView.setText(s.toString());
    }

    @Override
    public void afterTextChanged(Editable s) {
        // This method is called to notify you that somewhere within s, the text has been changed.
    }
});

在這個示例中，我們將輸入框的文本變化監(jiān)聽器添加到EditText中，然后在onTextChanged方法中將輸入框中的文本設(shè)置到TextView中，從而實現(xiàn)了TextView文本與輸入框聯(lián)動的效果。