TextView文本如何与输入框联动

要实现TextView文本与输入框联动，可以使用TextWatcher监听输入框的文本变化，然后将输入的文本设置到TextView中。以下是一个简单的示例代码：

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.
    }
});

在这个示例中，我们将输入框的文本变化监听器添加到EditText中，然后在onTextChanged方法中将输入框中的文本设置到TextView中，从而实现了TextView文本与输入框联动的效果。