我有一个JSON网址:: 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();
}
}
任何想法
答案 0 :(得分：0)
试试这个
从here下载AndroidQuery jar。
将此jar放到libs文件夹中，右键单击jar和Build Path - ＆gt;添加到bulid路径
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.
答案 1 :(得分：0)
您可以使用ImageLoader设置图像......
全局创建ImageLoader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);
答案 2 :(得分：0)
您可以使用此库从URL加载图片： https://github.com/shaunidiot/AndroidTutorial/tree/master/ionimagetest/bin
参考本教程的视频，了解如何操作： http://www.youtube.com/watch?v=zwR44n54-bk
此库将执行所有asyncTask过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