如何搜索字符串中的单词并在android中的文本视图中突出显示单词？

import android.text.TextWatcher;
import android.text.SpannableStringBuilder;
import android.text.style.TextAppearanceSpan;
import android.text.TextUtils;

public class MyTextWatcher implements TextWatcher {
    private SpannableStringBuilder mStringBuilder;

    public MyTextWatcher(String text) {
        mStringBuilder = new SpannableStringBuilder(text);
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    }

    @Override
    public void afterTextChanged(Editable editable) {
        String text = editable.toString();
        if (text.isEmpty()) {
            return;
        }

        int start = mStringBuilder.length();
        int end = start + text.length();

        for (int i = start; i < end; i++) {
            char c = text.charAt(i);
            if (c == ' ') {
                mStringBuilder.append("\n");
            } else if (c == '(' || c == '[' || c == '{') {
                // Add a space before the parenthesis
                mStringBuilder.insert(i, " ");
                i++;
            }
        }

        int index = mStringBuilder.length();

        // Add a space before the last word
        if (text.charAt(end - 1) == ' ') {
            mStringBuilder.append("\n");
        } else {
            mStringBuilder.append(" ");
        }

        // Highlight the last word
        TextAppearanceSpan highlightSpan = new TextAppearanceSpan(null, 0, index, TypedValue.COMPLETED_VALUE);
        mStringBuilder.setSpan(highlightSpan, index, index + text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    }
}