设置ImageView的android系统 [英] Setting imageview in android
本文介绍了设置ImageView的android系统的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个JSON网址:: http://54.218.73.244:7006/DescriptionSortedRating/
I have a 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格式的ImageView的
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- I have a imageview in XML
- How to set the image view for the JSONURL
- I have coded some part of the class but trying to know how to set the imageview
任何想法
推荐答案
您可以通过设置您的图片ImageLoader的......
You can set your Image using ImageLoader...
创建ImageLoader的实例在全球如..
Create instance of ImageLoader globally like..
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);
这篇关于设置ImageView的android系统的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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