我有一个JSON URL :: http://54.218.73.244:7006/DescriptionSortedRating/
http://54.218.73.244:7006/DescriptionSortedRating/
JSON STRUCT ::
"restaurants": [ { "restaurantID": 4, "restaurantNAME": "CopperChimney1", "restaurantIMAGE": "MarkBoulevard1.jpg", "restaurantDISTANCE": 15, "restaurantTYPE": "Indian", "restaurantRATING": 1, "restaurantPrice": 11, "restaurantTime": "9am t0 8pm" },
RestaurantDescPhotos.java
public class RestaurantDescPhotos extends Activity { // url to make request private static String url = "http://54.218.73.244:7006/DescriptionSortedRating/"; String restaurant_name, cc_res; ProgressDialog progressDialog; JSONObject jsonObject; JSONArray first_array; TextView textView; TextView text; private SparseArray<String> imagesMap = new SparseArray<String>(); ArrayList<HashMap<String, String>> list_of_images = new ArrayList<HashMap<String, String>>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.restaurant_desc_photos); progressDialog = new ProgressDialog(RestaurantDescPhotos.this); new ParsingAsync().execute(); } private class ParsingAsync extends AsyncTask<Void, Void, Void> { @Override protected void onPreExecute() { super.onPreExecute(); progressDialog = ProgressDialog.show(RestaurantDescPhotos.this, "", "Please Wait", true, false); } @Override protected Void doInBackground(Void... params) { // TODO Auto-generated method stub String _response = null; try { HttpClient httpclient = new DefaultHttpClient(); httpclient.getParams().setParameter( CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1); HttpGet request = new HttpGet(url); HttpResponse response = httpclient.execute(request); HttpEntity resEntity = response.getEntity(); _response = EntityUtils.toString(resEntity); jsonObject = new JSONObject(_response); first_array = jsonObject.getJSONArray("restaurants"); } catch (JSONException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void result) { // TODO Auto-generated method stub super.onPostExecute(result); progressDialog.dismiss(); // TextView timedisplay=(TextView) // findViewById(R.id.RestaurantTimeID); for (int i = 0; i < first_array.length(); i++) { try { JSONObject detail_obj = first_array.getJSONObject(i); HashMap<String, String> map_for_images = new HashMap<String, String>(); int id = detail_obj.getInt("_id"); String IMAGES = detail_obj.getString("restaurantIMAGE"); map_for_images.put("Starters", IMAGES); list_of_images.add(map_for_images); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } ImageView imageView = (ImageView) findViewById(R.id.DISP_IMG); } } }
RestaurantDescPhotos.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TableRow android:id="@+id/tableRow6" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="2sp" > </TableRow> <LinearLayout android:layout_width="match_parent" android:layout_height="40dp" > </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="60dp" > </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TableRow android:id="@+id/DescriptionTitleRow" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="2sp" > <HorizontalScrollView android:id="@+id/horizontalScrollView1" android:layout_width="wrap_content" android:layout_height="wrap_content" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > <ImageView android:id="@+id/DISP_IMG" android:layout_width="167dp" android:layout_height="167dp" android:src="@drawable/ic_launcher" /> </LinearLayout> </LinearLayout> </HorizontalScrollView> </TableRow> </LinearLayout> </LinearLayout>
ImageLoader.java
public class ImageLoader { MemoryCache memoryCache = new MemoryCache(); FileCache fileCache; private Map<ImageView, String> imageViews = Collections .synchronizedMap(new WeakHashMap<ImageView, String>()); ExecutorService executorService; // Handler to display images in UI thread Handler handler = new Handler(); public ImageLoader(Context context) { fileCache = new FileCache(context); executorService = Executors.newFixedThreadPool(5); } final int stub_id = R.drawable.temp_img; 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); Bitmap b = decodeFile(f); if (b != null) return b; // Download Images from the Internet 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(); conn.disconnect(); bitmap = decodeFile(f); return bitmap; } catch (Throwable ex) { ex.printStackTrace(); if (ex instanceof OutOfMemoryError) memoryCache.clear(); 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; FileInputStream stream1 = new FileInputStream(f); BitmapFactory.decodeStream(stream1, null, o); stream1.close(); // Find the correct scale value. It should be the power of 2. // Recommended Size 512 final int REQUIRED_SIZE = 70; int width_tmp = o.outWidth, height_tmp = o.outHeight; int scale = 1; while (true) { if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE) break; width_tmp /= 2; height_tmp /= 2; scale *= 2; } // Decode with inSampleSize BitmapFactory.Options o2 = new BitmapFactory.Options(); o2.inSampleSize = scale; FileInputStream stream2 = new FileInputStream(f); Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2); stream2.close(); return bitmap; } catch (FileNotFoundException e) { } catch (IOException e) { e.printStackTrace(); } 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() { try { if (imageViewReused(photoToLoad)) return; Bitmap bmp = getBitmap(photoToLoad.url); memoryCache.put(photoToLoad.url, bmp); if (imageViewReused(photoToLoad)) return; BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad); handler.post(bd); } catch (Throwable th) { th.printStackTrace(); } } } 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(); } }
有任何想法吗
您可以使用ImageLoader设置图像…
创建像全局的ImageLoader实例。
ImageLoader imageLoader; @Override protected void onCreate(Bundle savedInstanceState) { ...... imageLoader=new ImageLoader(ClassName.this); ImageView imageView = (ImageView) findViewById(R.id.DISP_IMG); ...... imageLoader.DisplayImage(YourImageURLHere,imageView);