TextView显示富文本图片

package com.android.device.utils;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.text.method.LinkMovementMethod;
import android.util.Log;
import android.util.Base64;
import android.widget.TextView;

import com.android.device.app.App;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.URL;

/**
 * 富文本显示
 * https://www.kaelli.com/21.html
 */
public class RichTextUtils {

    private static final String TAG = "RichTextUtils >>> ";


    /**
     * 显示富文本
     *
     * @param textView textView
     * @param richText 富文本
     */
    public static void showRichHtmlWithImageName(TextView textView, String richText) {
        /*
         * 加载图片，html中img src为drawable中图片名称
         * 例如："<strong>我的测试</strong><img src=\"photo.png\">"
         */
        Html.ImageGetter imageGetter = new Html.ImageGetter() {
            @Override
            public Drawable getDrawable(String source) {
                Log.d(TAG, "[showRichHtmlWithImageName] source is " + source);
                if (source == null) {
                    return null;
                }
                String resName = source.split("\\.")[0];
                Log.d(TAG, " resName is " + resName);
                Drawable drawable = getDrawableByName(App.getInstance().getApplicationContext(), resName);
                if (drawable != null) {
                    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
                }
                return drawable;
            }
        };
        /* 富文本内容转换为CharSequence */
        CharSequence charSequence = Html.fromHtml(richText, imageGetter, null);

        /* 设置TextView内容 */
        if (textView != null) {
            textView.setText(charSequence);
            textView.setMovementMethod(LinkMovementMethod.getInstance());
        }
        Log.d(TAG, "[showRichHtmlWithImageName] charSequence is " + charSequence);
    }

    /**
     * 显示富文本
     *
     * @param textView textView
     * @param richText 富文本
     */
    public static void showRichHtmlWithImageUrl(TextView textView, final String richText) {

        final MyHander myHander = new MyHander(textView);

        /* 由于需从网络中获取图片内容，故需开线程处理 */
        new Thread(new Runnable() {

            @Override
            public void run() {
                /*
                 * 显示网络图片
                 * 例如："<strong>我的测试</strong><img src=\"http://www.test.cn/2111111/0\">"
                 */
                Html.ImageGetter imageGetter = new Html.ImageGetter() {
                    @Override
                    public Drawable getDrawable(final String source) {
                        Log.d(TAG, "[showRichTextWithImageUrl] source is " + source);
                        if (source == null) {
                            return null;
                        }
                        Drawable drawable = null;
                        drawable = getUrlDrawable(source);
                        return drawable;
                    }
                };
                CharSequence charSequence = Html.fromHtml(richText, imageGetter, null);

                /* 发送消息 */
                Message message = new Message();
                message.what = 1;
                message.obj = charSequence;
                myHander.sendMessage(message);
            }
        }).start();
    }

    /**
     * 显示富文本
     *
     * @param textView textView
     * @param richText 富文本
     */
    public static void showRichHtmlWithImageContent(final TextView textView, final String richText) {
        final MyHander myHander = new MyHander(textView);
        new Thread() {
            public void run() {                
                /*
                 * 显示本地图片，Data URI scheme方式
                 * 例如：<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAA......
                 *      url:src=\"https"
                 */
                Html.ImageGetter imageGetter = new Html.ImageGetter() {
                    @Override
                    public Drawable getDrawable(String source) {
                        Log.d(TAG, "[showRichHtmlWithContent] source is " + source);
                        if (source == null) {
                            return null;
                        }
                        Drawable drawable = null;
                        if (checkIsUrl(source)) {//判断是url
                            drawable = getUrlDrawable(source);
                        } else {
                            /* 获取图片base64编码的字符串 */
                            int index = source.indexOf("base64,") + 7;
                            String imageContent = source.substring(index);
                            Log.d(TAG, "imageContent length is " + imageContent.length());

                            /* 将图片base64编码字符串转换成drawable */
                            Bitmap bitmap = stringToBitmap(imageContent);
                            drawable = new BitmapDrawable(App.getInstance().getResources(), bitmap);
                            drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
                        }
                        return drawable;
                    }
                };

                CharSequence charSequence = Html.fromHtml(richText, imageGetter, null);
                Log.d(TAG, "imageContent richText is " + richText);
                /* 发送消息 */
                Message message = new Message();
                message.what = 1;
                message.obj = charSequence;
                myHander.sendMessage(message);
            }
        }.start();

    }

    /**
     * 检查是否是Url
     *
     * @param source 字符串
     */
    private static boolean checkIsUrl(String source) {
        try {
            Log.d(TAG, "checkIsUrl" + source);
            URL url = new URL(source);
            if (url.getHost() != null) {
                return true;
            } else {
                return false;
            }
        } catch (Exception e) {
            return false;

        }
    }

    /**
     * 通过Url获取Drawable
     *
     * @param source URL地址
     */
    private static Drawable getUrlDrawable(String source) {
        Drawable drawable = null;
        try {
            URL url = new URL(source);
            InputStream is = url.openStream();
            Log.d(TAG, "is is " + is.toString());
            Bitmap bitmap = BitmapFactory.decodeStream(is);
            drawable = new BitmapDrawable(App.getInstance().getResources(), bitmap);
            drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
            return drawable;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    private static class MyHander extends Handler {
        TextView textView;

        MyHander(TextView textView) {
            this.textView = textView;
        }

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 1) {
                if (textView != null) {                
                    textView.setText((CharSequence) msg.obj);
                }
            }
        }
    }

    /**
     * 根据资源名获取图片ID
     */
    private static Drawable getDrawableByName(Context context, String resName) {
        if (context == null) {
            return null;
        }
        int resId = context.getResources().getIdentifier(resName, "drawable", context.getPackageName());
        if (resId == 0) {
            return null;
        }
        return context.getDrawable(resId);
    }

    /**
     * 将base64字符串转换成Bitmap类型
     *
     * @param content base64字符串
     * @return Bitmap
     */
    private static Bitmap stringToBitmap(String content) {
        byte[] bitmapArray = Base64.decode(content, Base64.DEFAULT);
        return BitmapFactory.decodeByteArray(bitmapArray, 0, bitmapArray.length);
    }

    /**
     * 将Bitmap转换成base64字符串
     *
     * @param bitmap Bitmap
     * @return base64字符串
     */
    private static String bitmapToString(Bitmap bitmap) {
        ByteArrayOutputStream bStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, bStream);
        byte[] bytes = bStream.toByteArray();
        return Base64.encodeToString(bytes, Base64.DEFAULT);
    }
}

测试用例：

private TextView tvContent;
RichTextUtils.showRichHtmlWithImageContent(tvContent, content);

本文地址：https://blog.csdn.net/casual_clover/article/details/107203903