public class CenteredImageSpan implements LineHeightSpan, Html.ImageGetter {

    private Context mContext;
    private Drawable mDrawable;

    public CenteredImageSpan(Context context, Drawable drawable) {
        mContext = context;
        mDrawable = drawable;
    }

    @Override
    public int getLeadingMargin(boolean first) {
        return mDrawable.getIntrinsicWidth() / 2;
    }

    @Override
    public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
        canvas.save();

        int transY = bottom - mDrawable.getBounds().bottom;

        canvas.translate(x + getLeadingMargin(true), transY / 2);
        mDrawable.draw(canvas);

        canvas.restore();
    }

    @Override
    public Drawable getDrawable(String source) {
        if (mDrawable == null) {
            // 获取图片
            Bitmap bitmap = BitmapFactory.decodeFile(source);
            mDrawable = new BitmapDrawable(mContext.getResources(), bitmap);
            mDrawable.setBounds(0, 0, mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());
        }
        return mDrawable;
    }
}

public class CenterImageTagHandler implements Html.TagHandler {

    private final TextView mTextView;

    public CenterImageTagHandler(TextView textView) {
        mTextView = textView;
    }

    @Override
    public void handleTag(boolean opening, String tag, Editable output, XMLReader xmlReader) {
        if (tag.equalsIgnoreCase("img")) {
            if (opening) {
                // 处理图片标签
                ImageSpanCenter span = new ImageSpanCenter(mTextView.getContext(), null);
                output.setSpan(span, output.length(), output.length(), Spannable.SPAN_MARK_MARK);
            } else {
                // 处理结束标签
                Object[] obj = output.getSpans(0, output.length(), Object.class);
                if (obj != null && obj.length > 0) {
                    Object span = obj[obj.length - 1];
                    int start = output.getSpanStart(span);
                    int end = output.length();
                    output.removeSpan(span);
                    if (start != end) {
                        // 设置图片的对齐方式为居中
                        span = new ImageSpanCenter(mTextView.getContext(), ((ImageSpan) span).getDrawable());
                        output.setSpan(span, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                    }
                }
            }
        }
    }

    private static class ImageSpanCenter extends ImageSpan {

        ImageSpanCenter(Context context, Drawable drawable) {
            super(drawable);
        }

        @Override
        public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
            Drawable drawable = getDrawable();

            canvas.save();

            // 获取 TextView 的宽度
            float textWidth = paint.measureText(text, start, end);
            Layout layout = ((TextView) ((Spanned) text).getSpans(0, ((Spanned) text).length(), Object.class)[0]).getLayout();
            float viewWidth = layout.getWidth();

            float transX = (viewWidth - textWidth) / 2 - drawable.getIntrinsicWidth() / 2;

            canvas.translate(x + transX, (top + bottom) / 2 - drawable.getIntrinsicHeight() / 2);
            drawable.draw(canvas);

            canvas.restore();
        }
    }
}

public class MyTextView extends AppCompatTextView {
    private static final int LONG_CLICK_TIME_THRESHOLD = 400;
    private long mStartClickTime = 0;

    public MyTextView(Context context) {
        super(context);
    }

    public MyTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        CharSequence text = getText();
        if (text instanceof Spanned) {
            Spanned spanned = (Spanned) text;
            int action = event.getAction();

            if (action == MotionEvent.ACTION_DOWN) {
                mStartClickTime = System.currentTimeMillis();
            } else if (action == MotionEvent.ACTION_UP) {
                long clickDuration = System.currentTimeMillis() - mStartClickTime;

                if (clickDuration < LONG_CLICK_TIME_THRESHOLD) {
                    int x = (int) event.getX();
                    int y = (int) event.getY();
                    x -= getTotalPaddingLeft();
                    y -= getTotalPaddingTop();
                    x += getScrollX();
                    y += getScrollY();
                    Layout layout = getLayout();
                    int line = layout.getLineForVertical(y);
                    int offset = layout.getOffsetForHorizontal(line, x);

                    ClickableSpan[] link = spanned.getSpans(offset, offset, ClickableSpan.class);
                    ImageSpan[] images = spanned.getSpans(offset, offset, ImageSpan.class);

                    if (link.length != 0) {
                        link[0].onClick(this);
                        return true;
                    } else if (images.length != 0) {
                        Drawable drawable = images[0].getDrawable();
                        Bitmap bitmap = null;
                        if (drawable instanceof BitmapDrawable) {
                            bitmap = ((BitmapDrawable) drawable).getBitmap();
                        } else if (drawable instanceof GifDrawable) {
                            bitmap = ((GifDrawable) drawable).getFirstFrame();
                        }
                        if (bitmap != null) {
                            AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
                            builder.setTitle("图片预览");
                            View view = LayoutInflater.from(getContext()).inflate(R.layout.dialog_image_preview, null);
                            ImageView imageView = view.findViewById(R.id.image_view);
                            imageView.setImageBitmap(bitmap);
                            builder.setView(view);
                            builder.setPositiveButton("放大", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    // 进行图片放大操作
                                }
                            });
                            builder.setNegativeButton("关闭", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    dialog.dismiss();
                                }
                            });
                            builder.show();
                            return true;
                        }
                    }
                }
            }
        }
        return super.onTouchEvent(event);
    }
}

// 使用方式
String html = "这是一张图片： <img src='file:///android_asset/sample.png'>";

MyTextView textView = findViewById(R.id.text_view);
textView.setText(Html.fromHtml(html, new Html.ImageGetter() {
    @Override
    public Drawable getDrawable(String source) {
        Drawable drawable = null;
        try {
            InputStream inputStream = getAssets().open(source);
            drawable = Drawable.createFromStream(inputStream, null);
            drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
        } catch (IOException e) {
            e.printStackTrace();
        }
        return drawable;
    }
}, null));
textView.setMovementMethod( LinkMovementMethod.getInstance());

myTextView.setText(Html.fromHtml("<h1>这是一级标题</h1><h2>这是二级标题</h2>"));

myTextView.setText(Html.fromHtml("<b>这段文字加粗</b>，<i>这段文字斜体</i>，<u>这段文字加下划线</u>，<strike>这段文字带删除线</strike>"));

myTextView.setText(Html.fromHtml("<ul><li>这是无序列表的第一项</li><li>这是无序列表的第二项</li></ul><ol><li>这是有序列表的第一项</li><li>这是有序列表的第二项</li></ol>"));

myTextView.setText(Html.fromHtml("请点击这个 <a href=\"http://www.baidu.com\">链接</a>"));
myTextView.setMovementMethod(LinkMovementMethod.getInstance());

public class MyLinkMovementMethod extends LinkMovementMethod {
    @Override
    public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
        int action = event.getAction();

        if (action == MotionEvent.ACTION_UP) {
            int x = (int) event.getX();
            int y = (int) event.getY();

            x -= widget.getTotalPaddingLeft();
            y -= widget.getTotalPaddingTop();

            x += widget.getScrollX();
            y += widget.getScrollY();

            Layout layout = widget.getLayout();
            int line = layout.getLineForVertical(y);
            int off = layout.getOffsetForHorizontal(line, x);

            URLSpan[] urls = buffer.getSpans(off, off, URLSpan.class);
            ClickableSpan[] cs = buffer.getSpans(off, off, ClickableSpan.class);

            if (urls.length != 0) {
                urls[0].onClick(widget);
                return true;
            } else if (cs.length != 0) {
                cs[0].onClick(widget);
                return true;
            }
        }
        return super.onTouchEvent(widget, buffer, event);
    }
}

myTextView.setMovementMethod(new MyLinkMovementMethod());

public class MyClickableSpan extends ClickableSpan {
    private String mHref;

    public MyClickableSpan(String href) {
        mHref = href;
    }

    @Override
    public void onClick(View widget) {
        Context context = widget.getContext();

        if (mHref.startsWith("myapp://activity_a")) {
            Intent intent = new Intent(context, ActivityA.class);
            context.startActivity(intent);
        } else if (mHref.startsWith("myapp://activity_b")) {
            Intent intent = new Intent(context, ActivityB.class);
            context.startActivity(intent);
        }
    }
}

// 使用方式
String html = "<a href=\"myapp://activity_a\">Activity A</a>" +
              "<a href=\"myapp://activity_b\">Activity B</a>";

TextView textView = findViewById(R.id.text_view);
textView.setText(Html.fromHtml(html));
textView.setMovementMethod(LinkMovementMethod.getInstance());
SpannableString text = (SpannableString) textView.getText();
MyClickableSpan[] links = text.getSpans(0, text.length(), MyClickableSpan.class);
for (MyClickableSpan span : links) {
    int start = text.getSpanStart(span);
    int end = text.getSpanEnd(span);
    text.setSpan(span, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

myTextView.setText(Html.fromHtml("<img src=\"https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png\"/>"));