Android 图文数据JSON解析

数据格式为

{"sid":"737",
"tts":"http://news.iciba.com/admin/tts/2013-12-11.mp3",
"content":"I don't want us to be together because we have to,I want us to be together because we want to.",
"note":"u6211u4e0du5e0cu671bu6211u4eecu56e0u4e3au201cu4e0du5f97u4e0du201du800cu5728u4e00u8d77uff0cu6211u5e0cu671bu6211u4eecu662fu56e0u4e3au60f3u5728u4e00u8d77u800cu5728u4e00u8d77u3002",
"translation":"u611fu8c22@u7a0bu5f88u591au8981u79d2u8650u6570u5b66 u6295u7a3fu3002u8bcdu9738u5c0fu7f16uff0cu8fd9u53e5u8bddu6765u81eau300au51b0u6cb3u4e16u7eaa2u300buff0cu662fu4e00u4e2au7cfbu5217u7684u52a8u753bu7535u5f71uff0cu975eu5e38u641eu7b11uff0cu4f60u770bu8fc7u5417uff1f",
"picture":"http://cdn.iciba.com/news/word/2013-12-11.jpg","picture2":"http://cdn.iciba.com/news/word/big_2013-12-11b.jpg","caption":"u8bcdu9738u6bcfu65e5u4e00u53e5",
"dateline":"2013-12-11",
"s_pv":"8693",
"sp_pv":"2090",
"tags":[{"id":"9","name":"u7231u60c5"},{"id":"14","name":"u7535u5f71u7ecfu5178"}],
"fenxiang_img":"http://cdn.iciba.com/web/news/longweibo/imag/2013-12-11.jpg"}

JSON字段解释

JSON 字段解释
{
'sid':'' #每日一句ID
'tts': '' #音频地址
'content':'' #英文内容
'note': '' #中文内容
'translation':'' #词霸小编
'picture': '' #图片地址
'picture2': '' #大图片地址
'caption':'' #标题
'dateline':'' #时间
's_pv':'' #浏览数
'sp_pv':'' #语音评测浏览数
'tags':'' #相关标签
'fenxiang_img':'' #合成图片，建议分享微博用的
}

最终实现的效果

具体实现，使用AsynTask异步访问网络：

class Load extends AsyncTask<String, String, String>
    {
        public String url = "http://open.iciba.com/dsapi/";
        ProgressDialog pdlg;
        String jsonstr = "";
        JSONObject json = null;
        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub
            try{
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost(url);
                HttpResponse httpResponse = httpClient.execute(httppost);
                HttpEntity httpEntity = httpResponse.getEntity();
                InputStream is = httpEntity.getContent();
                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                StringBuilder sb = new StringBuilder();
                String line = null;
                while ((line = reader.readLine()) != null)
                {
                    sb.append(line + "
");
                }
                is.close();
                jsonstr = sb.toString();
                json = new JSONObject(jsonstr.toString());
                engstr = json.getString("content");
                chistr = json.getString("note");
                imagurl = json.getString("picture");
                timestr =    json.getString("dateline");
                fromstr   =  json.getString("translation");
                JSONArray array = json.getJSONArray("tags");
                for(int i=0;i<array.length();i++)
                {
                    JSONObject tag = (JSONObject)array.get(i);
                    tagstr += tag.getString("name")+"," ; 
                }
            }catch(Exception e)
            {
                e.printStackTrace();
            }
            
            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            pdlg.dismiss();
            imageLoader.DisplayImage(imagurl,imageview);
            eng.setText("    "+engstr);
            chi.setText("    "+chistr);
            tag.setText(tagstr);
            time.setText(timestr);
            from.setText("    "+fromstr);
        }

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
            pdlg = new ProgressDialog(context);
            pdlg.setCancelable(false);
            pdlg.setMessage("正在加载");
            pdlg.show();
        }
    }

使用了一个图片处理的工具类，ImageLoader,主要用来通过url解析图片，处理图片的大小，以文件的形式缓存图片。

public class ImageLoader {
    
    MemoryCache memoryCache=new MemoryCache();
    FileCache fileCache;
    private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
    ExecutorService executorService; 
    
    public ImageLoader(Context context){
        fileCache=new FileCache(context);
        executorService=Executors.newFixedThreadPool(5);
    }
    
    final int stub_id = R.drawable.drug_trans;
    public void DisplayImage(String url, ImageView imageView)
    {
        imageViews.put(imageView, url);
        Bitmap bitmap=memoryCache.get(url);
        if(bitmap!=null)
            imageView.setImageBitmap(bitmap);
        else
        {
            queuePhoto(url, imageView);
            imageView.setImageResource(stub_id);
        }
    }
        
    private void queuePhoto(String url, ImageView imageView)
    {
        PhotoToLoad p=new PhotoToLoad(url, imageView);
        executorService.submit(new PhotosLoader(p));
    }
    
    private Bitmap getBitmap(String url) 
    {
        File f=fileCache.getFile(url);
        
        //from SD cache
        Bitmap b = decodeFile(f);
        if(b!=null)
            return b;
        
        //from web
        try {
            Bitmap bitmap=null;
            URL imageUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(is, os);
            os.close();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Exception ex){
           ex.printStackTrace();
           return null;
        }
    }

    //decodes image and scales it to reduce memory consumption
    private Bitmap decodeFile(File f){
        try {
            //decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(new FileInputStream(f),null,o);
            
            //Find the correct scale value. It should be the power of 2.
            final int REQUIRED_SIZE=70;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/1.5<REQUIRED_SIZE || height_tmp/1.5<REQUIRED_SIZE)
                    break;
                width_tmp/=1.5;
                height_tmp/=1.5;
                scale*=1.5;
            }
            
            //decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
        } catch (FileNotFoundException e) {}
        return null;
    }
    
    //Task for the queue
    private class PhotoToLoad
    {
        public String url;
        public ImageView imageView;
        public PhotoToLoad(String u, ImageView i){
            url=u; 
            imageView=i;
        }
    }
    
    class PhotosLoader implements Runnable {
        PhotoToLoad photoToLoad;
        PhotosLoader(PhotoToLoad photoToLoad){
            this.photoToLoad=photoToLoad;
        }
        
        @Override
        public void run() {
            if(imageViewReused(photoToLoad))
                return;
            Bitmap bmp=getBitmap(photoToLoad.url);
            memoryCache.put(photoToLoad.url, bmp);
            if(imageViewReused(photoToLoad))
                return;
            BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad);
            Activity a=(Activity)photoToLoad.imageView.getContext();
            a.runOnUiThread(bd);
        }
    }
    
    boolean imageViewReused(PhotoToLoad photoToLoad){
        String tag=imageViews.get(photoToLoad.imageView);
        if(tag==null || !tag.equals(photoToLoad.url))
            return true;
        return false;
    }
    
    //Used to display bitmap in the UI thread
    class BitmapDisplayer implements Runnable
    {
        Bitmap bitmap;
        PhotoToLoad photoToLoad;
        public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;}
        public void run()
        {
            if(imageViewReused(photoToLoad))
                return;
            if(bitmap!=null)
                photoToLoad.imageView.setImageBitmap(bitmap);
            else
                photoToLoad.imageView.setImageResource(stub_id);
        }
    }

    public void clearCache() {
        memoryCache.clear();
        fileCache.clear();
    }

}