在android中设置imageview

我有一个JSON URL :: 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 imagesMap = new SparseArray(); ArrayList<HashMap> list_of_images = new ArrayList<HashMap>(); @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 { @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 map_for_images = new HashMap(); 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

ImageLoader.java

 public class ImageLoader { MemoryCache memoryCache = new MemoryCache(); FileCache fileCache; private Map imageViews = Collections .synchronizedMap(new WeakHashMap()); 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(); } } 

• 我有一个XML的imageview
• 如何设置JSONURL的图像视图
• 我编写了课程的某些部分，但试图了解如何设置imageview

有任何想法吗

Answer 1

您可以使用ImageLoader设置图像…

全局创建ImageLoader的实例，如..

  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); 

Answer 2

试试这个

1. 从这里下载AndroidQuery jar。

2. 将此jar放到libs文件夹中，右键单击jar和Build Path – > Add to bulid path

3. 如何使用请参阅此示例

    AQuery androidQuery = new AQuery(this); // make AndroidQuery object androidQuery.id(yourImageView).image(imageUrl, isCacheUrlImageOnMemery, isCacheUrlImageOnFile); // use this way isCacheUrlImageOnMemery - if true then given url image cahce on memery so after word android query check is given url image cahce on either memery or file then it take from cahce other wise it try to getting from url isCacheUrlImageOnFile - same like isCacheUrlImageOnMemery but first of all android query check on memery then file in case if we have not much of memery then we cahce on file tht y two option are available. 

Answer 3

您可以使用此库从URL加载图像： https ： //github.com/shaunidiot/AndroidTutorial/tree/master/ionimagetest/bin

请参阅本教程video，了解如何操作： http ： //www.youtube.com/watch？v = zwR44n54-bk

此库将执行所有asyncTask进程以加载和查看图像，如果URL中的图像被删除或不可用，您还可以使用占位符图像