Android TextView 显示HTML加图片

TextView显示网络图片，我用android2.3的系统，可以显示图片出来，并且如果图片比较大，应用会卡的现象，肯定是因为使用主线程去获取网络图片造成的，但如果我用android4.0以上的系统运行，则不能显示图片，只显示小方框。

究其原因，是在4.0的系统上执行的时候报错了，异常是：android.os.NetworkOnMainThreadException 经过查文档，原来是4.0系统不允许主线程(UI线程)访问网络，因此导致了其异常。说白了就是在主线程上访问网络，会造成主线程挂起，系统不允许使用了。

此处有作部分修改，代码独立。图片实现异步加载。解决上述问题

用法，调用代码activity

[html]
//TextView 控件
textViewContent = (TextView) getActivity().findViewById(R.id.textview_prodcut_detail_more_zp_content);
//HTML文本
zp_content = "测试图片信息：<br><img src=\"http://b2c.zeeeda.com/upload/2013/05/10/136814766742544.jpg\" />";
//默认图片，无图片或没加载完显示此图片
Drawable defaultDrawable = MainActivity.ma.getResources().getDrawable(R.drawable.stub);
//调用
Spanned sp = Html.fromHtml(zp_content, new HtmlImageGetter(textViewContent, "/esun_msg", defaultDrawable), null);
textViewContent.setText(sp);

//TextView 控件
textViewContent = (TextView) getActivity().findViewById(R.id.textview_prodcut_detail_more_zp_content);
//HTML文本
zp_content = "测试图片信息：<br><img src=\"http://b2c.zeeeda.com/upload/2013/05/10/136814766742544.jpg\" />";
//默认图片，无图片或没加载完显示此图片
Drawable defaultDrawable = MainActivity.ma.getResources().getDrawable(R.drawable.stub);
//调用
Spanned sp = Html.fromHtml(zp_content, new HtmlImageGetter(textViewContent, "/esun_msg", defaultDrawable), null);
textViewContent.setText(sp);
HtmlImageGetter类[html]
mport java.io.InputStream;

import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Environment;
import android.text.Html.ImageGetter;
import android.util.Log;
import android.widget.TextView;

public class HtmlImageGetter implements ImageGetter{
    private TextView _htmlText;
    private String _imgPath;
    private Drawable _defaultDrawable;
    private String TAG = "HtmlImageGetter";

    public HtmlImageGetter(TextView htmlText, String imgPath, Drawable defaultDrawable){
        _htmlText = htmlText;
        _imgPath = imgPath;
        _defaultDrawable = defaultDrawable;
    }

    @Override
    public Drawable getDrawable(String imgUrl) {

        String imgKey = String.valueOf(imgUrl.hashCode());
        String path = Environment.getExternalStorageDirectory() + _imgPath;
        FileUtil.createPath(path);

        String[] ss = imgUrl.split("\\.");
        String imgX = ss[ss.length-1];
        imgKey = path+"/" + imgKey+"."+imgX;


        if(FileUtil.exists(imgKey)){
            Drawable drawable = FileUtil.getImageDrawable(imgKey);
            if(drawable != null){
                drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
                return drawable;
            }else{
                Log.v(TAG,"load img:"+imgKey+":null");
            }
        }

        URLDrawable urlDrawable = new URLDrawable(_defaultDrawable);
        new AsyncThread(urlDrawable).execute(imgKey, imgUrl);
        return urlDrawable;
    }

    private class AsyncThread extends AsyncTask<String, Integer, Drawable> {
        private String imgKey;
        private URLDrawable _drawable;

        public AsyncThread(URLDrawable drawable){
            _drawable = drawable;
        }

        @Override
        protected Drawable doInBackground(String... strings) {
            imgKey = strings[0];
            InputStream inps = NetWork.getInputStream(strings[1]);
            if(inps == null) return _drawable;

            FileUtil.saveFile(imgKey, inps);
            Drawable drawable = Drawable.createFromPath(imgKey);
            return drawable;
        }

        public void onProgressUpdate(Integer... value) {

        }

        @Override
        protected void onPostExecute(Drawable result) {
            _drawable.setDrawable(result);
            _htmlText.setText(_htmlText.getText());
        }
    }

    public class URLDrawable extends BitmapDrawable {

        private Drawable drawable;

        public URLDrawable(Drawable defaultDraw){
            setDrawable(defaultDraw);
        }

补充：移动开发 , Android ,