要在Android TextView中实现HTML文本在行尾换行，可以使用以下代码示例：

1. 首先，在XML布局文件中定义一个TextView控件：

2. 在Java代码中，获取并设置HTML文本到TextView：

TextView textView = findViewById(R.id.textView);
String htmlText = "This is a long line of text that needs to be wrapped at the end of the line. This is a long line of text that needs to be wrapped at the end of the line. This is a long line of text that needs to be wrapped at the end of the line.";
textView.setText(Html.fromHtml(htmlText));

3. 创建一个自定义的HtmlTagHandler类来处理HTML标签，并在标签结尾处添加一个换行符：

import android.text.Editable;
import android.text.Html;
import android.text.Spannable;
import android.text.Spanned;
import android.text.TextUtils;
import android.text.style.ClickableSpan;
import android.view.View;

import org.xml.sax.XMLReader;

public class HtmlTagHandler implements Html.TagHandler {

    private static final String TAG_BR = "br";

    @Override
    public void handleTag(boolean opening, String tag, Editable output, XMLReader xmlReader) {
        if (tag.equalsIgnoreCase(TAG_BR) && !opening) {
            output.append("\n");
        }
    }
}

4. 修改Java代码中的TextView设置，以使用自定义的HtmlTagHandler：

TextView textView = findViewById(R.id.textView);
String htmlText = "This is a long line of text that needs to be wrapped at the end of the line. This is a long line of text that needs to be wrapped at the end of the line. This is a long line of text that needs to be wrapped at the end of the line.";

// 设置自定义的HtmlTagHandler
HtmlTagHandler htmlTagHandler = new HtmlTagHandler();
textView.setText(Html.fromHtml(htmlText, null, htmlTagHandler));

通过这个解决方法，HTML文本将在TextView中的行尾处自动换行。