Android_universal-image-load use

One, fast use (make sure the imageloader is initialized only once, so the picture cache is better.) ）

Scene: Sets a picture of the specified URI for ImageView.

1, guide package, configure the network, read and write SD card permissions.

2, Initialize:

imageloaderconfiguration config = new Imageloaderconfiguration.builder (context). build ();

ImageLoader.getInstance.init (config);

3, parameter configuration

Displayimageoptions displayimageoptions = new Displayimageoptions.builder ()
. Showstubimage (R.drawable.ic_launcher)
. Showimageonfail (R.drawable.ic_launcher)
. Imagescaletype (imagescaletype.exactly)
. Showimageforemptyuri (R.drawable.ic_launcher). Cacheinmemory (True)
. Cacheondisc (True). Displayer (New Fadeinbitmapdisplayer (300))
. Imagescaletype (imagescaletype.exactly). build ();

4. Set the picture.

Imageloader.displayimage (uri,mimageview,displayimageoptions);

Second, function (translated from GitHub)

Source: Https://github.com/dodola/Android-Universal-Image-Loader

Function: 1, multi-threaded picture loading;

2, as far as possible to reconcile the most extensive picture loading configuration (sub-threading, download, decode, memory & HDD cache, display pictures, and others);

3, listen to the download process as much as possible;

4, as far as possible for various parameters to customize the display image call;

5, support desktop small space

Support Android version 2.0 or above.

Three, the initialization parameter introduction:

Configuration

All options are selectable in the configuration builder. Use the ones you really want to customize.

DON ' T COPY this CODE to YOUR project! This is just example of the all options using.

File Cachedir = storageutils.getcachedirectory (context); Imageloaderconfiguration config = new        Imageloaderconfiguration.builder (context). Memorycacheextraoptions (480, +)//default = Device screen dimensions        . Disccacheextraoptions (480, Compressformat.jpeg, Asynctask.thread_pool_executor). Taskexecutor . Taskexecutorforcachedimages (Asynctask.thread_pool_executor). ThreadPoolSize (3)//default. Threadpriorit Y (thread.norm_priority-1)//default. Tasksprocessingorder (QUEUEPROCESSINGTYPE.FIFO)//default. Denycache Imagemultiplesizesinmemory (). MemoryCache (New Lrumemorycache (2 * 1024x768)). Memorycachesize (2 * 1024 * 1 024). Disccache (New Unlimiteddisccache (Cachedir))//default. Disccachesize (* 1024x768). Discca Chefilecount (+). Disccachefilenamegenerator (New Hashcodefilenamegenerator ())//default. Imagedownloader (n EW Baseimagedownloader (context))//default.Imagedecoder (New Baseimagedecoder ())//default. Defaultdisplayimageoptions (Displayimageoptions.createsimple ())// Default. enableLogging (). build ();

Display Option

Display options that can be requested by any one of the display threads.

DON ' T COPY this CODE to YOUR project! This is just example of the all options using. Displayimageoptions options = new Displayimageoptions.builder ()        . showimageonloading (r.drawable.ic_stub)// Resource or drawable        . Showimageforemptyuri (r.drawable.ic_empty)//resource or drawable        . Showimageonfail ( R.DRAWABLE.IC_ERROR)//resource or drawable        . Resetviewbeforeloading (FALSE)  //default        . Delaybeforeloading (1000)

If you want to load the picture from the cache, the arguments for the following two statements are set to true.        . Cacheinmemory (FALSE)//default.

. Cacheondisc (FALSE)///default        . Preprocessor (...).        Postprocessor (...)        . Extrafordownloader (...)        . Imagescaletype (imagescaletype.in_sample_power_of_2)//default        . Bitmapconfig (Bitmap.Config.ARGB_8888)// Default        . Decodingoptions (...)        . Displayer (New Simplebitmapdisplayer ())//default.        Handler (new handler ())//default        . Build ();

Four, use cases

Display the URI used by the picture:

String Imageuri = "Http://site.com/image.png"; From webstring Imageuri = "File:///mnt/sdcard/image.png"; From SD cardstring Imageuri = "CONTENT://MEDIA/EXTERNAL/AUDIO/ALBUMART/13"; From content providerstring Imageuri = "Assets://image.png"; From assetsstring Imageuri = "drawable://" + r.drawable.image; From Drawables (only images, Non-9patch)

Note: Use drawable://unless you really need him. Always pay attention to the use of local image loading method: Setimageresource band instead of Imageloader.

Five, useful information

1,imageloader.getinstance (). init (config); Initialize when the app is turned on.

2,<uses-permission android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"/>SD card cache is required Write permission

3,imageloader determines the width and height of the picture according to the width,height of ImageView.

4, if the oom often occurs

① reduces the size of the thread pool in the configuration (. threadpoolsize). Recommendation 1-5;

② use. Bitmapconfig (Bitmap.config.RGB_565) instead of argb_8888;

③ use .imageScaleType(ImageScaleType.IN_SAMPLE_INT) or try.imageScaleType(ImageScaleType.EXACTLY)；

   ④避免使用RoundedBitmapDisplayer.他会创建新的ARGB_8888格式的Bitmap对象；

   ⑤使用.memoryCache(new WeakMemoryCache())，不要使用.cacheInMemory();

5，内存缓存，sd卡缓存，显示图片，可以使用已经初始化过的实现；

6，为了避免使用list，grid，scroll，你可以使用

Boolean pauseonscroll = false; or Trueboolean pauseonfling = true; or Falsepauseonscrolllistener listener = new Pauseonscrolllistener (Imageloader, Pauseonscroll, pauseonfling); Listview.setonscrolllistener (listener);

Android_universal-image-load use