Android is a simple method for loading images asynchronously,

Android is a simple method for loading images asynchronously,

First, I have abandoned this method. I used it before and found that the loading speed is not good. I am not very careful about it.

Now I use volley. It is only critical to everyone.

Package com. souya. seller. util. ex; import java. io. file; import java. io. fileInputStream; import java. io. inputStream; import java. lang. ref. softReference; import java. util. hashMap; import java. util. concurrent. threadPoolExecutor; import java. util. concurrent. timeUnit; import AXLib. utility. console; import AXLib. utility. httpClient; import AXLib. utility. queue; import AXLib. utility. runtimeExceptionEx; import android. con Tent. context; import android. graphics. bitmap; import android. graphics. bitmapFactory; import android. graphics. drawable. bitmapDrawable; import android. graphics. drawable. drawable; import android. media. thumbnailUtils; import android.net. uri; import android. OS. handler; import android. OS. message; import android. provider. mediaStore. video. thumbnails; import android. util. log; import android. widget. imageView; import co M. souya. seller. app. sellerApplication; public class AsyncImageLoader {private static boolean _ D = false; // AppConfig. _ D & private static final String TAG = "AsyncImageLoader"; public static String CachePath = null; private static String ThumbnailPath = null; private static boolean _ isInit = false; private static Context _ ctx; private static Bitmap _ empty = Bitmap. createBitmap (1, 1, Bitmap. config. RGB_565 ); Private static HashMap <String, SoftReference <Bitmap> imageCache = new HashMap <String, SoftReference <Bitmap> (); private static Queue <Runnable> queue = new Queue <Runnable> (); // thread pool: a maximum of 50 threads, one thread per execution, and the timeout time for Idle threads to end: 180 seconds private static ThreadPoolExecutor executor = new ThreadPoolExecutor (1, 20,300, TimeUnit. SECONDS, queue); public final static AsyncImageLoader Instance = new AsyncImageLoader (); public static Void Init (final Context context) {CachePath = SellerApplication. getInstance (). mAppCacheDir + ""; ThumbnailPath = CachePath + "/thumbnails"; if (! New File (ThumbnailPath ). exists () new File (ThumbnailPath ). mkdirs (); _ ctx = context; _ isInit = true;} public static Drawable loadDrawable (final Context context, final String url, final ImageCallback imageCallback) {if (! _ IsInit) Init (context); final String key = url; synchronized (imageCache) {if (imageCache. containsKey (key) {SoftReference <Bitmap> softReference = imageCache. get (key); Bitmap bmp = softReference. get (); if (bmp! = Null &&! Bmp. isRecycled () {if (bmp = _ empty) {bmp = bmp;} elsereturn new BitmapDrawable (bmp) ;}} else {imageCache. put (key, new SoftReference <Bitmap> (_ empty) ;}} final Handler handler = new Handler () {public void handleMessage (Message message) {imageCallback. imageLoaded (Drawable) message. obj, url) ;}}; // use the thread pool to download the image task executor.exe cute (new Runnable () {@ Overridepublic void run () {Bitmap bmp = loadImage (url); if (Bmp! = Null) {synchronized (imageCache) {if (imageCache. containsKey (key) {imageCache. put (key, new SoftReference <Bitmap> (bmp); Message message = handler. obtainMessage (0, new BitmapDrawable (bmp); handler. sendMessage (message);} else {if (! Bmp. isRecycled () bmp. recycle (); bmp = null; System. gc () ;}}}}); return null;} public static Drawable loadDrawable (final Context context, final String url, final int width, final int height, final ImageCallback imageCallback) {if (! _ IsInit) Init (context); final String key = String. format ("% s _ % d", url, width, height); if (imageCache. containsKey (key) {SoftReference <Bitmap> softReference = imageCache. get (key); Bitmap bmp = softReference. get (); if (bmp! = Null &&! Bmp. isRecycled () {if (bmp = _ empty) {bmp = bmp;} elsereturn new BitmapDrawable (bmp) ;}} else {imageCache. put (key, new SoftReference <Bitmap> (_ empty);} final Handler handler = new Handler () {public void handleMessage (Message message) {imageCallback. imageLoaded (Drawable) message. obj, url) ;};// use a thread pool to download an image executor.exe cute (new Runnable () {@ Overridepublic void run () {Bitmap bmp = loadImageAndScale (u Rl, width, height); if (imageCache. containsKey (key) {imageCache. put (key, new SoftReference <Bitmap> (bmp); Message message = handler. obtainMessage (0, new BitmapDrawable (bmp); handler. sendMessage (message);} else {if (! Bmp. isRecycled () bmp. recycle (); bmp = null; System. gc () ;}}); return null;} public static void releaseDrawable (String url, int width, int height) {log ("releaseDrawable" + url ); string key = String. format ("% s _ % d", url, width, height); releaseDrawable (key);} public static void releaseDrawable (String url) {try {log ("releaseDrawable" + url); String key = url; synchronized (imageCache) {if (imageCache. contai NsKey (key) {SoftReference <Bitmap> softReference = imageCache. get (key); imageCache. remove (key); Bitmap bmp = softReference. get (); if (bmp! = Null & bmp! = _ Empty &&! Bmp. isRecycled () {bmp. recycle (); bmp = null;} System. gc () ;}} catch (Exception e) {String stack = RuntimeExceptionEx. getStackTraceString (e) ;}} private static HashMap <String, Object >_loadimagelocks = new HashMap <String, Object> (); public static Bitmap loadImage (String url) {log ("londImage:" + url); Object lockObj = null; synchronized (_ loadImageLocks) {if (_ loadImageLocks. containsKey (url) lockObj = _ loa DImageLocks. get (url); else {lockObj = new Object (); _ loadImageLocks. put (url, lockObj) ;}} synchronized (lockObj) {if (isLocalImage (url) return loadLocalImage (url); else {String localUrl = getCacheFileName (url ); bitmap bmp = null; if (new File (localUrl ). exists () bmp = loadLocalImage (localUrl); try {if (bmp = null) bmp = loadHttpImage (url, 0, 0);} catch (Throwable e) {if (_ D) throw RuntimeExceptionEx. create (E);} return bmp;} public static Bitmap loadImage (String url, int width, int height) {log ("londImage:" + url); Object lockObj = null; synchronized (_ loadImageLocks) {if (_ loadImageLocks. containsKey (url) lockObj = _ loadImageLocks. get (url); else {lockObj = new Object (); _ loadImageLocks. put (url, lockObj) ;}} synchronized (lockObj) {if (isLocalImage (url) return loadLocalImage (url, width, height); else {String LocalUrl = getCacheFileName (url); Bitmap bmp = null; if (new File (localUrl ). exists () bmp = loadLocalImage (localUrl, width, height); try {if (bmp = null) bmp = loadHttpImage (url, width, height );} catch (Throwable e) {if (_ D) throw RuntimeExceptionEx. create (e) ;}return bmp ;}} private static Bitmap loadLocalImageByVideo (String url) {log ("loadLocalImageByVideo:" + url); if (! New File (url ). exists () return null; Bitmap bmp = ThumbnailUtils. createVideoThumbnail (url, Thumbnails. MINI_KIND); return bmp;} private static Bitmap loadLocalImage (String url) {return loadLocalImage (url, 0);} private static Bitmap loadLocalImage (String url, int width, int height) {if (width = 0 & height = 0) return loadLocalImage (url); elsereturn _ loadLocalImage (url, width, height);} private static Bitm Ap _ loadLocalImage (String url, int width, int height) {try {if (! New File (url ). exists () return null; // obtain the width and height of the screen. *** to calculate the scaling ratio, we need to obtain the size of the entire image, instead of the image * BitmapFactory. the Options class has a Boolean variable inJustDecodeBounds and sets it to true *. In this way, we get the image size instead of loading the image. When we set this value, we can start from BitmapFactory. * The outWidth and outHeight values of Options */BitmapFactory. options op = new BitmapFactory. options (); op. inJustDecodeBounds = true; Uri uri = Uri. fromFile (new File (url); // because MediaStore is used for storage, Bitmap pic = BitmapFactory is obtained based on the URI. decodeStream (_ ctx. getContentResolver (). openInputStream (uri), null, op); int wRatio = (int) Math. ceil (op. outWidth/(float) width); // calculate the width ratio of int h Ratio = (int) Math. ceil (op. outHeight/(float) height); // calculate the height Ratio if (pic! = Null &&! Pic. isRecycled () pic. recycle ();/*** next, we need to determine whether to scale and whether to scale the width or height. If not all the height and width exceed the screen, no scaling is required. * If both the height and width exceed the screen size, how can we select zoom? This requires determining the size of wRatio and hRatio * the larger one will be scaled, because when the scale is large, small ones should be scaled at the same rate automatically. The inSampleSize variable */if (wRatio> 1 & hRatio> 1) {if (wRatio> hRatio) {op. inSampleSize = wRatio;} else {op. inSampleSize = hRatio ;}} op. inJustDecodeBounds = false; // note that the value must be set to false, because we set it to true to obtain the image size. try {pic = BitmapFactory. decodeStream (_ ctx. getContentResolver (). openInputStream (uri), null, op);} catch (OutOfMemoryError e) {loadLocalImage (url, 1);} return pic;} catch (Throwable e) {throw RuntimeExceptionEx. Create (e) ;}} private static Bitmap loadLocalImage (String url, int inSampleSize) {log ("loadLocalImage:" + url); if (! New File (url ). exists () return null; if (url. endsWith (". mp4 ") | url. endsWith (". 3gp ") {return loadLocalImageByVideo (url);} BitmapFactory. options opt = new BitmapFactory. options (); // opt. inPreferredConfig = Bitmap. config. RGB_565; // opt. inPurgeable = true; // opt. ininputwritable able = true; opt. inSampleSize = inSampleSize; // obtain the resource image InputStream is = null; try {is = new FileInputStream (url); if (is! = Null) {Bitmap map = BitmapFactory. decodeStream (is, null, opt); if (map = null) return null; int height = map. getHeight (); int width = map. getWidth (); if (width> 1920 | height> 1080) {if (inSampleSize = 0) inSampleSize = 2; elseinSampleSize ++; if (is! = Null) {try {is. close () ;}catch (Exception ex) {}} map. recycle (); map = null; return loadLocalImage (url, inSampleSize);} else {return map ;}} catch (OutOfMemoryError e) {if (is! = Null) {try {is. close () ;}catch (Exception ex) {}} System. gc (); if (inSampleSize <50) {if (inSampleSize = 0) inSampleSize = 2; elseinSampleSize ++; return loadLocalImage (url, inSampleSize);} elsereturn null ;} catch (Throwable e) {String stack = RuntimeExceptionEx. getStackTraceString (e); // CLLog. error (e); // if (_ D) // throw RuntimeExceptionEx. create (e) ;}finally {if (is! = Null) {try {is. close () ;}catch (Exception e) {}} System. gc ();} return null;} private static Bitmap loadHttpImage (String url, int width, int height) {log ("loadHttpImage:" + url ); string localUrl = getCacheFileName (url); try {HttpClient hc = new HttpClient (); if (hc. downFile (url, localUrl) return loadLocalImage (localUrl, width, height); elsereturn null;} catch (Exception e) {String stack = runtime1_tio NEx. getStackTraceString (e); // CLLog. error (e); // if (_ D) // throw RuntimeExceptionEx. create (e);} return null;} public static Bitmap loadImageAndScale (String url, int width, int height) {log ("loadImageAndScale:" + url ); string thumbnailUrl = getThumbnailFileName (url, width, height); Bitmap bmp = loadLocalImage (url, width, height); if (bmp = null) {try {bmp = loadImage (url, width, height);} catch (Exception E) {String stack = RuntimeExceptionEx. GetStackTraceString (e);} if (bmp! = Null) {Bitmap bmp thumbnail = ImageHelper. ScaleAndSave (bmp, thumbnailUrl, width, height, true, true); if (bmp thumbnail! = Bmp &&! Bmp. isRecycled () bmp. recycle (); bmp = null; System. gc (); bmp = bmp thumbnail;} return bmp;} private static boolean isLocalImage (String url) {return new File (url ). exists ();} private static String getCacheFileName (String url) {if (isLocalImage (url) return url; String localUrl = null; if (url! = Null & url. length ()! = 0) {localUrl = CachePath + "/" + url. substring (url. lastIndexOf ("/") + 1);} return localUrl;} private static String getThumbnailFileName (String url, int width, int height) {String thumbnailUrl = null; if (url! = Null & url. length ()! = 0) {thumbnailUrl = String. format ("% s/% d _ % s", ThumbnailPath, width, height, url. substring (url. lastIndexOf ("/") + 1);} return thumbnailUrl;} private static void log (String msg) {// Console. d ("AsyncImageLoader", msg);} public interface ImageCallback {public void imageLoaded (Drawable imageDrawable, String imageUrl );}}