直接用webview加载：

package com.example.testcsdnproject;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class RichTextViewActivity extends AppCompatActivity {

    private WebView webview_intro;      //webview加载富文本
    //网页加载富文本的限制标签
    private String CSS_STYLE =" <style> p {color:#FFFFFF;} a {color:#FFFFFF;}  img{max-width:100% !important;height:auto !important}video{max-width:100% !important;height:auto !important}  p span{color:#FFFFFF !important; background-color:#1A1A1A !important; font-size:20px;}</style>";
//    private String CSS_Content = "";
    //测试数据
        private String CSS_Content = "<h3><span style=\"color: rgb(245, 245, 245);\">hello world</span></h3><p><span style=\"color: rgb(255, 251, 143);\">阿大声道啊大师大的撒打算的撒打发的股份的回复的后代鼓捣鼓捣 阿打算打打打算的啊大大十多万鹅鹅鹅我热潮中在大大</span></p><p><br></p><p><br></p><p><span style=\"color: rgb(255, 251, 143);\">撒旦教奥斯卡了的骄傲了看得见卡的好拉屎的金卡价saduoiejwrwmflkvnfslvlkaosfjdfms</span></p><p><span style=\"color: rgb(255, 251, 143);\">舒服vhskdjklvnmxmvxsdfsdfsdfjjsj;lrjewklrjkl</span></p><p><img src=\"https://img1.baidu.com/it/u=186439391,629096241&fm=253&fmt=auto&app=120&f=JPEG?w=500&h=740\" alt=\"\" data-href=\"\" style=\"\"/></p><p><br></p><p><br></p><p><span style=\"color: rgb(255, 77, 79);\">结尾。。。。。。asd.asdas撒as大大啊我u哦IE问问瑞荣 &nbsp;1231312313112313132131231</span><div class=\"media-wrap video-wrap\"><video controls=\"\" class=\"media-wrap video-wrap\" src=\"https://images.artvrpro.com/activity%2F1668587203846-7_1.MP4.7_1.MP4\"></video></div></p>";
//    private String CSS_STYLE =" <style> p {color:#FFFFFF;} a {color:#FFFFFF;}  img{max-width:100% !important;height:auto !important}video{max-width:100% !important;height:auto !important}</style>";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rich_text_view);

        webview_intro = findViewById(R.id.webview_intro);
        initWebViewContent(CSS_Content);
    }


    /**
     * 传入参数为String的时候
     */
    @SuppressLint("NewApi")
    private void initWebViewContent(String content) {
        Log.e("colincontent: ", content);

        WebChromeClient wvcc = new WebChromeClient();
        WebSettings webSettings = webview_intro.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setUseWideViewPort(true); // 关键点
        webSettings.setAllowFileAccess(true); // 允许访问文件
        webSettings.setSupportZoom(true); // 支持缩放w
        webSettings.setLoadWithOverviewMode(true);
        webSettings.setAppCacheEnabled(true);
        webSettings.setDatabaseEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
        webSettings.setTextZoom(200);


        webview_intro.setBackgroundColor(Color.parseColor("#FF1A1A1A"));

        webview_intro.setWebChromeClient(wvcc);
        content = content.replaceAll("background-color:#ffffff", "background-color:#1A1A1A");
        CSS_Content = content;
        webview_intro.loadDataWithBaseURL(null, CSS_STYLE+getNewContent(content), "text/html", "utf-8", null);

        webview_intro.setWebViewClient(new WebViewClient(){
            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);


                // 解决NestedScrollView嵌套WebView底部留白问题
//                        webview_intro.getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;

                //这是我找到的最简单的方法(例如，将文本颜色更改为白色)：
                view.loadUrl(
                        "javascript:document.body.style.setProperty(\"color\", \"white\");"
                );

            }
        });


    }

    //视频屏幕宽度 解决视频超出屏幕宽度的问题
    private String getNewContent(String htmlText) {
        Document doc = Jsoup.parse(htmlText);
        Elements elements = doc.getElementsByTag("img");
        for (Element element : elements) {
            element.attr("width", "100%").attr("height", "auto");
        }
        Elements elementsVideo = doc.getElementsByTag("video");
        for (Element element : elementsVideo) {
            element.attr("width", "100%").attr("height", "auto");
        }
        return doc.toString();
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(webview_intro!=null){    //销毁界面时要释放webview，否则退出页面还会播放视频音频
            webview_intro.loadUrl("about:blank");
            webview_intro =null;
        }
    }
}

xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".RichTextViewActivity"
    android:background="#101010">

    <WebView
        android:id="@+id/webview_intro"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:scrollbars="none"
        android:visibility="visible"

        android:focusable="false"
        android:nestedScrollingEnabled="false"/>

</RelativeLayout>

这里用的是原生的webview，会有一个问题，就是特殊的视频格式可能会出问题，项目中可以使用腾讯的X5内核的webview 。

效果如下:

分割线=======================================

如果不想用webview加载富文本也可以用富文本编辑器：

 //导入图文编辑
    api ('com.github.wordpress-mobile.WordPress-Aztec-Android:aztec:v1.3.44')
    api ('com.github.wordpress-mobile.WordPress-Aztec-Android:glide-loader:v1.3.44')
    api ('com.github.wordpress-mobile.WordPress-Aztec-Android:wordpress-comments:v1.3.44')
    api ('com.github.wordpress-mobile.WordPress-Aztec-Android:wordpress-shortcodes:v1.3.44')

private AztecText mAztecText;
protected Aztec aztec;

 aztec = Aztec.with(mAztecText,
                new SourceViewEditText(getActivity()),
                new AztecToolbar(getActivity()),
                new IAztecToolbarClickListener() {
                    @Override
                    public void onToolbarCollapseButtonClicked() {

                    }

                    @Override
                    public void onToolbarExpandButtonClicked() {

                    }

                    @Override
                    public void onToolbarFormatButtonClicked(@NonNull ITextFormat iTextFormat, boolean b) {

                    }

                    @Override
                    public void onToolbarHeadingButtonClicked() {

                    }

                    @Override
                    public void onToolbarHtmlButtonClicked() {

                    }

                    @Override
                    public void onToolbarListButtonClicked() {

                    }

                    @Override
                    public boolean onToolbarMediaButtonClicked() {
                        return false;
                    }
                })
                .setImageGetter(new GlideImageLoader(getActivity()))
                .setOnLinkTappedListener(this)    /*添加超链接点击监听*/
                .setLinkTapEnabled(true)
                .addPlugin(new WordPressCommentsPlugin(mAztecText))
                .addPlugin(new CaptionShortcodePlugin(mAztecText))
                .addPlugin(new HiddenGutenbergPlugin(mAztecText));

        mAztecText.setKeyListener(null);
 aztec.getVisualEditor().fromHtml("富文本", false);

XML：

 <org.wordpress.aztec.AztecText
            android:id="@+id/aztec"
            style="@style/EditTextTheme"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/dp_16"
            android:layout_marginRight="@dimen/dp_16"
            android:focusable="false"
            android:gravity="top|start"
            android:imeOptions="flagNoExtractUi"
            android:paddingEnd="@dimen/dp_16"
            android:paddingLeft="@dimen/dp_16"
            android:paddingRight="@dimen/dp_16"
            android:paddingTop="@dimen/dp_16"
            android:scrollbars="none"
            android:visibility="gone"
            aztec:bulletColor="@color/bulletColor"
            aztec:bulletMargin="@dimen/dp_6"
            aztec:bulletPadding="@dimen/dp_5"
            aztec:codeColor="@color/colorLightBlack"
            aztec:historyEnable="true"
            aztec:historySize="10"
            aztec:linkColor="@color/linkColor"
            aztec:linkUnderline="true"
            aztec:quoteBackground="@color/quoteBackground"
            aztec:quoteColor="@color/quoteColor"
            aztec:quoteMargin="@dimen/dp_0"
            aztec:quotePadding="@dimen/dp_10"
            aztec:quoteWidth="@dimen/dp_5"
            aztec:textColor="@color/colorLightBlack"/>