Android 图文数据JSON解析，金山词霸每日一句API的调用

金山词霸开发的免费API http://open.iciba.com/dsapi/

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":"\u6211\u4e0d\u5e0c\u671b\u6211\u4eec\u56e0\u4e3a\u201c\u4e0d\u5f97\u4e0d\u201d\u800c\u5728\u4e00\u8d77\uff0c\u6211\u5e0c\u671b\u6211\u4eec\u662f\u56e0\u4e3a\u60f3\u5728\u4e00\u8d77\u800c\u5728\u4e00\u8d77\u3002",
"translation":"\u611f\u8c22@\u7a0b\u5f88\u591a\u8981\u79d2\u8650\u6570\u5b66 \u6295\u7a3f\u3002\u8bcd\u9738\u5c0f\u7f16\uff0c\u8fd9\u53e5\u8bdd\u6765\u81ea\u300a\u51b0\u6cb3\u4e16\u7eaa2\u300b\uff0c\u662f\u4e00\u4e2a\u7cfb\u5217\u7684\u52a8\u753b\u7535\u5f71\uff0c\u975e\u5e38\u641e\u7b11\uff0c\u4f60\u770b\u8fc7\u5417\uff1f",
"picture":"http:\/\/cdn.iciba.com\/news\/word\/2013-12-11.jpg","picture2":"http:\/\/cdn.iciba.com\/news\/word\/big_2013-12-11b.jpg","caption":"\u8bcd\u9738\u6bcf\u65e5\u4e00\u53e5",
"dateline":"2013-12-11",
"s_pv":"8693",
"sp_pv":"2090",
"tags":[{"id":"9","name":"\u7231\u60c5"},{"id":"14","name":"\u7535\u5f71\u7ecf\u5178"}],
"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 + "\n");
}
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();
}

}