java – 在android中设置imageview
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内容图文
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<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();
}
}
>我有一个XML的imageview
>如何设置JSONURL的图像视图
>我编写了课程的一部分,但试图知道如何设置
ImageView的
有任何想法吗
解决方法:
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);
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