全局配置 android-image-loader的使用

public?class Application?extends?Application?{??

??

????@Override??

????public?void?onCreate()?{??

????????super.onCreate();??

????????initImageLoader(getApplicationContext());??

????}??

??

????public?static?void?initImageLoader(Context?context)?{??

????????//緩存文件的目錄??

????????File?cacheDir?=?StorageUtils.getOwnCacheDirectory(context,?"universalimageloader/Cache");???

????????ImageLoaderConfiguration?config?=?new?ImageLoaderConfiguration.Builder(context)??

????????????????.memoryCacheExtraOptions(480,?800)?//?max?width,?max?height，即保存的每個緩存文件的最大長寬???

????????????????.threadPoolSize(3)?//線程池內線程的數量??

????????????????.threadPriority(Thread.NORM_PRIORITY?-?2)??

????????????????.denyCacheImageMultipleSizesInMemory()??

????????????????.diskCacheFileNameGenerator(new?Md5FileNameGenerator())?//將保存的時候的URI名稱用MD5?加密??

????????????????.memoryCache(new?UsingFreqLimitedMemoryCache(2?*?1024?*?1024))??

????????????????.memoryCacheSize(2?*?1024?*?1024)?//?內存緩存的最大值??

????????????????.diskCacheSize(50?*?1024?*?1024)??//?SD卡緩存的最大值??

????????????????.tasksProcessingOrder(QueueProcessingType.LIFO)??

????????????????//?由原先的discCache?->?diskCache??

????????????????.diskCache(new?UnlimitedDiscCache(cacheDir))//自定義緩存路徑????

????????????????.imageDownloader(new?BaseImageDownloader(context,?5?*?1000,?30?*?1000))?//?connectTimeout?(5?s),?readTimeout?(30?s)超時時間????

????????????????.writeDebugLogs()?//?Remove?for?release?app??

????????????????.build();??

????????//全局初始化此配置????

????????ImageLoader.getInstance().init(config);??

????}??

}?

?

?

主要類文件

public?class?MainActivity?extends?Activity?{??

????private?ImageLoader?imageLoader;??

????private?ListView?lv;??

????private?String[]?imageUrls;??

????private?DisplayImageOptions?options;??

??

????@Override??

????protected?void?onCreate(Bundle?savedInstanceState)?{??

????????super.onCreate(savedInstanceState);??

????????setContentView(R.layout.activity_main);??

????????imageLoader?=?ImageLoader.getInstance();??

????????lv?=?(ListView)findViewById(R.id.list);??

??????????

????????imageUrls?=?Constants.images;??

??

????????//?使用DisplayImageOptions.Builder()創建DisplayImageOptions??

????????options?=?new?DisplayImageOptions.Builder()??

????????????????.showImageOnLoading(R.drawable.ic_stub)?//?設置圖片下載期間顯示的圖片??

????????????????.showImageForEmptyUri(R.drawable.ic_empty)?//?設置圖片Uri為空或是錯誤的時候顯示的圖片??

????????????????.showImageOnFail(R.drawable.ic_error)?//?設置圖片加載或解碼過程中發生錯誤顯示的圖片??

????????????????.cacheInMemory(true)?//?設置下載的圖片是否緩存在內存中??

????????????????.cacheOnDisk(true)?//?設置下載的圖片是否緩存在SD卡中??

????????????????.displayer(new?RoundedBitmapDisplayer(20))?//?設置成圓角圖片??

????????????????.build();?//?構建完成??

????????lv.setAdapter(new?ItemListAdapter());??

????}??

??

????@Override??

????public?boolean?onCreateOptionsMenu(Menu?menu)?{??

????????//?Inflate?the?menu;?this?adds?items?to?the?action?bar?if?it?is?present.??

????????getMenuInflater().inflate(R.menu.main,?menu);??

????????return?true;??

????}??

??

????@Override??

????public?boolean?onOptionsItemSelected(MenuItem?item)?{??

????????switch?(item.getItemId())?{??

????????????case?R.id.item_clear_memory_cache:??

????????????????ImageLoader.getInstance().clearMemoryCache();??

????????????????return?true;??

????????????case?R.id.item_clear_disc_cache:??

????????????????ImageLoader.getInstance().clearDiskCache();??

????????????????return?true;??

????????????default:??

????????????????return?false;??

????????}??

????}??

??

????class?ItemListAdapter?extends?BaseAdapter?{??

????????@Override??

????????public?int?getCount()?{??

????????????//?TODO?Auto-generated?method?stub??

????????????return?imageUrls.length;??

????????}??

??

????????@Override??

????????public?Object?getItem(int?position)?{??

????????????//?TODO?Auto-generated?method?stub??

????????????return?imageUrls[position];??

????????}??

??

????????@Override??

????????public?View?getView(int?position,?View?convertView,?ViewGroup?parent)?{??

????????????//?TODO?Auto-generated?method?stub??

????????????ViewHolder?holder?=?null;??

????????????if?(convertView?==?null)?{??

????????????????convertView?=?getLayoutInflater().inflate(R.layout.item_list,?parent,?false);??

????????????????holder?=?new?ViewHolder();??

????????????????holder.text?=?(TextView)?convertView.findViewById(R.id.text);??

????????????????holder.image?=?(ImageView)?convertView.findViewById(R.id.image);??

????????????????convertView.setTag(holder);??

????????????}?else?{??

????????????????holder?=?(ViewHolder)?convertView.getTag();??

????????????}??

????????????holder.text.setText("Item?"?+?(position?+?1));??

????????????imageLoader.displayImage(imageUrls[position],?holder.image,?options);??

????????????return?convertView;??

????????}??

??

????????@Override??

????????public?long?getItemId(int?position)?{??

????????????//?TODO?Auto-generated?method?stub??

????????????return?position;??

????????}??

??

????????class?ViewHolder?{??

????????????public?ImageView?image;??

????????????public?TextView?text;??

????????}??

????}??

??

}?

轉載于:https://www.cnblogs.com/zhou2016/p/5600941.html

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