如何在edittext中强制用户仅输入表情符号

import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import java.util.regex.Pattern;

public class EmojiTextWatcher implements TextWatcher {
    private EditText editText;
    private Pattern emojiPattern;

    public EmojiTextWatcher(EditText editText) {
        this.editText = editText;
        // 使用正则表达式匹配表情符号
        emojiPattern = Pattern.compile("[\\uD83C-\\uDBFF\\uDC00-\\uDFFF]+");
    }

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

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    @Override
    public void afterTextChanged(Editable s) {
        String input = s.toString();
        if (!isValidInput(input)) {
            // 如果输入内容不符合要求，则清除或替换输入内容
            editText.setText("");
        }
    }

    private boolean isValidInput(String input) {
        // 使用正则表达式匹配输入内容
        return emojiPattern.matcher(input).matches();
    }
}

EditText editText = findViewById(R.id.editText);
editText.addTextChangedListener(new EmojiTextWatcher(editText));