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class Load extends AsyncTask<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<p>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。</p><pre class="brush:java;">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 a="(Activity)photoToLoad.imageView.getContext();" activity="" bd="new" bitmap="b;photoToLoad=p;}" bitmapdisplayer="" bitmapfactory.options="" bmp="getBitmap(photoToLoad.url);" boolean="" catch="" decode="" display="" else="" filenotfoundexception="" for="" height_tmp="" imageview="" implements="" in="" insamplesize="" new="" o2="new" o2.insamplesize="scale;" override="" photosloader="" phototoload="" pre="" private="" public="" queue="" return="" runnable="" string="" tag="=null" task="" the="" this.phototoload="photoToLoad;" thread="" to="" ui="" url="u;" used="" void="" width_tmp="" with=""><p> </p><p> </p></required_size></imageview,></imageview,></pre>
</array.length();i++)></string,>
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