本文实例讲述了Android实现TextView显示HTML加图片的方法。分享给大家供大家参考，具体如下：
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
//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：
import 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); } private void setDrawable(Drawable ndrawable){ drawable = ndrawable; drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable .getIntrinsicHeight()); setBounds(0, 0, drawable.getIntrinsicWidth(), drawable .getIntrinsicHeight()); } @Override public void draw(Canvas canvas) { drawable.draw(canvas); } } }
NetWork 类：
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.zip.GZIPInputStream; import java.util.zip.InflaterInputStream; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.entity.BufferedHttpEntity; import org.apache.http.impl.client.DefaultHttpClient; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.util.Log; public class NetWork { private static String TAG = "NetWork"; public static String getHttpData(String baseUrl){ return getHttpData(baseUrl, "GET", "", null); } public static String postHttpData(String baseUrl, String reqData){ return getHttpData(baseUrl, "POST", reqData, null); } public static String postHttpData(String baseUrl, String reqData, HashMap<String, String> propertys){ return getHttpData(baseUrl, "POST", reqData, propertys); } /** * 获取赛事信息 * @return */ public static String getHttpData(String baseUrl, String method, String reqData, HashMap<String, String> propertys){ String data = "", str; PrintWriter outWrite = null; InputStream inpStream = null; BufferedReader reader = null; HttpURLConnection urlConn = null; try{ URL url = new URL(baseUrl); urlConn = (HttpURLConnection)url.openConnection(); //启用gzip压缩 urlConn.addRequestProperty("Accept-Encoding", "gzip, deflate"); urlConn.setRequestMethod(method); urlConn.setDoOutput(true); urlConn.setConnectTimeout(3000); if(propertys != null && !propertys.isEmpty()){ Iterator<Map.Entry<String, String>> props = propertys.entrySet().iterator(); Map.Entry<String, String> entry; while (props.hasNext()){ entry = props.next(); urlConn.setRequestProperty(entry.getKey(), entry.getValue()); } } outWrite = new PrintWriter(urlConn.getOutputStream()); outWrite.print(reqData); outWrite.flush(); urlConn.connect(); //获取数据流 inpStream = urlConn.getInputStream(); String encode = urlConn.getHeaderField("Content-Encoding"); //如果通过gzip if(encode !=null && encode.indexOf("gzip") != -1){ Log.v(TAG, "get data :" + encode); inpStream = new GZIPInputStream(inpStream); }else if(encode != null && encode.indexOf("deflate") != -1){ inpStream = new InflaterInputStream(inpStream); } reader = new BufferedReader(new InputStreamReader(inpStream)); while((str = reader.readLine()) != null){ data += str; } }catch (MalformedURLException ex){ ex.printStackTrace(); }catch (IOException ex){ ex.printStackTrace(); }finally{ if(reader !=null && urlConn!=null){ try { outWrite.close(); inpStream.close(); reader.close(); urlConn.disconnect(); } catch (IOException ex) { ex.printStackTrace(); } } } Log.d(TAG, "[Http data]["+baseUrl+"]:" + data); return data; } /** * 获取Image信息 * @return */ public static Bitmap getBitmapData(String imgUrl){ Bitmap bmp = null; Log.d(TAG, "get imgage:"+imgUrl); InputStream inpStream = null; try{ HttpGet http = new HttpGet(imgUrl); HttpClient client = new DefaultHttpClient(); HttpResponse response = (HttpResponse)client.execute(http); HttpEntity httpEntity = response.getEntity(); BufferedHttpEntity bufferedHttpEntity = new BufferedHttpEntity(httpEntity); //获取数据流 inpStream = bufferedHttpEntity.getContent(); bmp = BitmapFactory.decodeStream(inpStream); }catch (Exception ex){ ex.printStackTrace(); }finally{ if(inpStream !=null){ try { inpStream.close(); } catch (IOException ex) { ex.printStackTrace(); } } } return bmp; } /** * 获取url的InputStream * @param urlStr * @return */ public static InputStream getInputStream(String urlStr){ Log.d(TAG, "get http input:"+urlStr); InputStream inpStream = null; try{ HttpGet http = new HttpGet(urlStr); HttpClient client = new DefaultHttpClient(); HttpResponse response = (HttpResponse)client.execute(http); HttpEntity httpEntity = response.getEntity(); BufferedHttpEntity bufferedHttpEntity = new BufferedHttpEntity(httpEntity); //获取数据流 inpStream = bufferedHttpEntity.getContent(); }catch (Exception ex){ ex.printStackTrace(); }finally{ if(inpStream !=null){ try { inpStream.close(); } catch (IOException ex) { ex.printStackTrace(); } } } return inpStream; } }
FileUtil类：
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Environment; import android.util.Log; public class FileUtil { private static int FILE_SIZE = 4*1024; private static String TAG = "FileUtil"; public static boolean hasSdcard(){ String status = Environment.getExternalStorageState(); if(status.equals(Environment.MEDIA_MOUNTED)){ return true; } return false; } public static boolean createPath(String path){ File f = new File(path); if(!f.exists()){ Boolean o = f.mkdirs(); Log.i(TAG, "create dir:"+path+":"+o.toString()); return o; } return true; } public static boolean exists(String file){ return new File(file).exists(); } public static File saveFile(String file, InputStream inputStream){ File f = null; OutputStream outSm = null; try{ f = new File(file); String path = f.getParent(); if(!createPath(path)){ Log.e(TAG, "can't create dir:"+path); return null; } if(!f.exists()){ f.createNewFile(); } outSm = new FileOutputStream(f); byte[] buffer = new byte[FILE_SIZE]; while((inputStream.read(buffer)) != -1){ outSm.write(buffer); } outSm.flush(); }catch (IOException ex) { ex.printStackTrace(); return null; }finally{ try{ if(outSm != null) outSm.close(); }catch (IOException ex) { ex.printStackTrace(); } } Log.v(TAG,"[FileUtil]save file:"+file+":"+Boolean.toString(f.exists())); return f; } public static Drawable getImageDrawable(String file){ if(!exists(file)) return null; try{ InputStream inp = new FileInputStream(new File(file)); return BitmapDrawable.createFromStream(inp, "img"); }catch (Exception ex){ ex.printStackTrace(); } return null; } }
希望本文所述对大家Android程序设计有所帮助。
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