android的TextView使用Html(图片显示)格式。。。。。。

一、[Android实例]实现TextView里的文字有不同颜色

转eoe:http://www.eoeandroid.com/thread-4496-1-1.html

import android.text.Html;


TextView t3 = (TextView) findViewById(R.id.text3);
        t3.setText(
            Html.fromHtml(
                "<b>text3:</b>  Text with a " +
                "<a href=/"http://www.google.com/">link</a> " +
                "created in the Java source code using HTML."));

 

 

二、TextView显示html文件中的图片

转javaeye:http://da-en.javaeye.com/blog/712415

 

我们知道要让TextView解析和显示Html代码。可以使用
Spanned text = Html.fromHtml(source);
tv.setText(text);
来实现,这个用起来简单方便。
但是,怎样让TextView也显示Html中<image>节点的图像呢?

我们可以看到fromHtml还有另一个重构:
fromHtml(String source, Html.ImageGetter imageGetter, Html.TagHandler tagHandler)

实现一下ImageGetter就可以让图片显示了:
ImageGetter imgGetter = new Html.ImageGetter() {
             @Override
             public Drawable getDrawable(String source) {
                   Drawable drawable = null;
                   drawable = Drawable.createFromPath(source);  // Or fetch it from the URL
                   // Important
                   drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable
                                 .getIntrinsicHeight());
                   return drawable;
             }
};

至于TagHandler,我们这里不需要使用,可以直接传null。
参考文档:
http://tech-droid.blogspot.com/2010/06/textview-with-html-content.html英语好的朋友就直接看英文文档吧。

 

三、Android---文字中插入表情

转:http://blog.163.com/spf9190@126/blog/static/50207531201091545954587/

       这段时间在做一个短信项目,需要实现短信中插入表情的功能,本一位非常困难,经过一段时间的研究,发现还是比较簡単的,现在总结如下。

       以短信输入框为例,短信的输入框是一个EditText,它的append方法不仅可以加入字符串,还可以添加HTML标记。以下就是使用HTML标记添加表情的具体操作。

 

   首先需要构建一个ImageGetter,作用是通过HTML标记获得对应在res目录下的图片:

       ImageGetter imageGetter = new ImageGetter() {  
        @Override
       public Drawable getDrawable(String source) {
       int id = Integer.parseInt(source);

      //根据id从资源文件中获取图片对象
       Drawable d = getResources().getDrawable(id);
       d.setBounds(0, 0, d.getIntrinsicWidth(),d.getIntrinsicHeight());
        return d;
       }
       };          

然后就可以直接往EditText视图中添加

       inputLable.append(Html.fromHtml("<img src='"+clickedImageId+"'/>", imageGetter, null));                  

  其中 Html.fromHtml("<img src='"+clickedImageId+"'/>"就是HTML的图片标记,在Android中支持了部分HTML标记的使用(这方面我还在继续研究),HTML标记必须被Html.fromHtml修饰。imageGetter即为之前创建的ImageGetter类型的对象。

很简单的几句代码就解决了问题,不仅在EditText中,在TextView中同样可以这样插入图片。

效果图:

android的TextView使用Html(图片显示)格式。。。。。。_第1张图片
 
 
在此感谢网上共享资料和经验的朋友们,虽然是比较簡単的功能,但网上的文献对我的帮助还是有很大的。
四、 android 短信字符转表情显示过程(转)
转: http://dianzisu.javaeye.com/blog/734327

android 的短信实现方式普通用户适应的话需要长时间的使用才能习惯,将andorid的短信模式设置成我们常用的(一般人用户)的习惯。在查看字符转图片的过程中可以猜测出腾讯的QQ表情的原理应该是一样的

只是在传送非常用的表情时是将byte数据转换为image.

转载请注明:QQ:273733055 [email protected]

/***
     * 
         * 
此方法描述的是:   注意此方法在做表情转换的准备了

         * @author:[email protected],[email protected]
         * @version: 2010-5-13 
下午03:31:13
     */
    private void bindCommonMessage(final MessageItem msgItem) {
        if (mDownloadButton != null) {
            mDownloadButton.setVisibility(View.GONE);
            mDownloadingLabel.setVisibility(View.GONE);
        }
        // Since the message text should be concatenated with the sender's
        // address(or name), I have to display it here instead of
        // displaying it by the Presenter.
        mBodyTextView.setTransformationMethod(HideReturnsTransformationMethod.getInstance());

        // Get and/or lazily set the formatted message from/on the
        // MessageItem. Because the MessageItem instances come from a
        // cache (currently of size ~50), the hit rate on avoiding the
        // expensive formatMessage() call is very high.
        CharSequence formattedMessage = msgItem.getCachedFormattedMessage();
        if (formattedMessage == null) { //
肯定为null应为msgItem.formattedMessage从诞生来就没被注意过一次

            formattedMessage = formatMessage(msgItem.mContact, msgItem.mBody,   //
重点到了
                                             msgItem.mSubject, msgItem.mTimestamp,
                                             msgItem.mHighlight);
            msgItem.setCachedFormattedMessage(formattedMessage);
        }
        mBodyTextView.setText(formattedMessage);

        if (msgItem.isSms()) {
            hideMmsViewIfNeeded();
        } else {
            Presenter presenter = PresenterFactory.getPresenter(
                    "MmsThumbnailPresenter", mContext,
                    this, msgItem.mSlideshow);
            presenter.present();

            if (msgItem.mAttachmentType != WorkingMessage.TEXT) {
                inflateMmsView();
                mMmsView.setVisibility(View.VISIBLE);
                setOnClickListener(msgItem);
                drawPlaybackButton(msgItem);
            } else {
                hideMmsViewIfNeeded();
            }
        }

        drawLeftStatusIndicator(msgItem.mBoxId);
        drawRightStatusIndicator(msgItem);
    }
//------------------------------------------------------------------------------

/***
     * 
         * 
此方法描述的是:   开始转换了哦

         * @author:[email protected],[email protected]
         * @version: 2010-5-13 
下午03:32:52
     */
    private CharSequence formatMessage(String contact, String body, String subject,
                                       String timestamp, String highlight) {
        CharSequence template = mContext.getResources().getText(R.string.name_colon); //
遇到鬼了     &lt;主题:
<xliff:g id="SUBJECT">%s</xliff:g>&gt;"
        SpannableStringBuilder buf =                   //
把他当作StringBuffer只是它可以放的不是 String 而已他能放跟多类型的东西

            new SpannableStringBuilder(TextUtils.replace(template,
                new String[] { "%s" },
                new CharSequence[] { contact })); //
替换成联系人

        boolean hasSubject = !TextUtils.isEmpty(subject); //主题
        if (hasSubject) {
            buf.append(mContext.getResources().getString(R.string.inline_subject, subject)); //buff
先在是 联系人 主题 XXXX      eg wuyi <主题:dsadasdsa> 我爱我家
        }

        if (!TextUtils.isEmpty(body)) {
            if (hasSubject) {
                buf.append(" - "); //
如果内容有主题有就+ " - "    eg wuyi <主题
:sdsadsadsa> - 
            }
            SmileyParser parser = SmileyParser.getInstance(); //
获得表情类了哦

            buf.append(parser.addSmileySpans(body)); //
追查 急切关注中
        }
        if (!TextUtils.isEmpty(timestamp)) {
            buf.append("/n");
            int startOffset = buf.length();

            // put a one pixel high spacer line between the message and the time stamp as requested
            // by the spec.
            //
把之间的信息和时间戳的要求间隔一个像素的高线

            //
由规范
            buf.append("/n");
            buf.setSpan(new AbsoluteSizeSpan(3), startOffset, buf.length(),
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            startOffset = buf.length();
            buf.append(timestamp);
            buf.setSpan(new AbsoluteSizeSpan(12), startOffset, buf.length(),
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            // Make the timestamp text not as dark 
改变某区域颜色   时间的地方为特殊颜色

            int color = mContext.getResources().getColor(R.color.timestamp_color);
            buf.setSpan(new ForegroundColorSpan(color), startOffset, buf.length(),
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        if (highlight != null) {
            int highlightLen = highlight.length();

            String s = buf.toString().toLowerCase();
            int prev = 0;
            while (true) {
                int index = s.indexOf(highlight, prev);
                if (index == -1) {
                    break;
                }
                buf.setSpan(new StyleSpan(Typeface.BOLD), index, index + highlightLen, 0);
                prev = index + highlightLen;
            }
        }
        return buf;
    }

//------------------------------------------------------------

/**
     * Adds ImageSpans to a CharSequence that replace textual emoticons such
     * as :-) with a graphical version.
     * 
     * @param text A CharSequence possibly containing emoticons
     * @return A CharSequence annotated with ImageSpans covering any
     *         recognized emoticons.
     * 
添加ImageSpans一个CharSequence的表情符号代替文字等     *如用图形版本:-)

     * 
核心是把表情字符替换成ImageSpans的对象
     */
    public CharSequence addSmileySpans(CharSequence text) {
        SpannableStringBuilder builder = new SpannableStringBuilder(text);

        Matcher matcher = mPattern.matcher(text);
        while (matcher.find()) {
            int resId = mSmileyToRes.get(matcher.group());
            //
注意下面的一块有点不好理解哦但是是核心

            builder.setSpan(new ImageSpan(mContext, resId), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        }

        return builder;
    }

总结:

     android 在将字符转化为表情图像其核心代码为

builder.setSpan(new ImageSpan(mContext, resId), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
原理过程是先匹配到表情字符然后通过new ImageSpan(上下文,表情地址)绘制出一个ImageView然后替换掉表情字符。

 

五、文档

public static Spanned fromHtml (String source, Html.ImageGetter imageGetter, Html.TagHandler tagHandler) 

Since: API Level 1 

Returns displayable styled text from the provided HTML string. Any <img> tags in the HTML will use the specified ImageGetter to request a representation of the image (use null if you don't want this) and the specified TagHandler to handle unknown tags (specify null if you don't want this). 

 

This uses TagSoup to handle real HTML, including all of the brokenness found in the wild. 

 

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