Android-Universal-Image-Loader三大组件DisplayImageOptions、ImageLoader、ImageLoaderConfiguration详解
2016-07-03 15:09
603 查看
一、介绍
Android-Universal-Image-Loader是一个开源的UI组件程序,该项目的目的是提供一个可重复使用的仪器为异步图像加载,缓存和显示。所以,如果你的程序里需要这个功能的话,那么不妨试试它。因为已经封装好了一些类和方法。我们可以直接拿来用了。而不用重复去写了。其实,写一个这方面的程序还是比较麻烦的,要考虑多线程缓存,内存溢出等很多方面。
二、具体使用
一个好的类库的重要特征就是可配置性强。我们先简单使用Android-Universal-Image-Loader,一般情况下使用默认配置就可以了。下面的实例利用Android-Universal-Image-Loader将网络图片加载到图片墙中。
1 public class BaseActivity extends Activity { 2 ImageLoader imageLoader; 3 @Override 4 protected void onCreate(Bundle savedInstanceState) { 5 // Create global configuration and initialize ImageLoader with this configuration 6 ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext()) 7 .build(); 8 ImageLoader.getInstance().init(config); 9 super.onCreate(savedInstanceState); 10 } 11 }
<
4000
div class="cnblogs_code_toolbar" style="margin-top:5px;">
1 public class MainActivity extends BaseActivity { 2 3 @Override 4 protected void onCreate(Bundle savedInstanceState) { 5 super.onCreate(savedInstanceState); 6 setContentView(R.layout.activity_main); 7 8 ImageLoader imageLoader = ImageLoader.getInstance(); 9 10 GridView gridView = (GridView) this.findViewById(R.id.grdvImageWall); 11 gridView.setAdapter(new PhotoWallAdapter(Constants.IMAGES)); 12 } 13 14 static class ViewHolder { 15 ImageView imageView; 16 ProgressBar progressBar; 17 } 18 19 public class PhotoWallAdapter extends BaseAdapter { 20 String[] imageUrls; 21 ImageLoader imageLoad; 22 DisplayImageOptions options; 23 LinearLayout gridViewItem; 24 25 public PhotoWallAdapter(String[] imageUrls) { 26 assert imageUrls != null; 27 this.imageUrls = imageUrls; 28 29 options = new DisplayImageOptions.Builder() 30 .showImageOnLoading(R.drawable.ic_stub) // resource or 31 // drawable 32 .showImageForEmptyUri(R.drawable.ic_empty) // resource or 33 // drawable 34 .showImageOnFail(R.drawable.ic_error) // resource or 35 // drawable 36 .resetViewBeforeLoading(false) // default 37 .delayBeforeLoading(1000).cacheInMemory(false) // default 38 .cacheOnDisk(false) // default 39 .considerExifParams(false) // default 40 .imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2) // default 41 .bitmapConfig(Bitmap.Config.ARGB_8888) // default 42 .displayer(new SimpleBitmapDisplayer()) // default 43 .handler(new Handler()) // default 44 .build(); 45 this.imageLoad = ImageLoader.getInstance(); 46 47 } 48 49 @Override 50 public int getCount() { 51 return this.imageUrls.length; 52 } 53 54 @Override 55 public Object getItem(int position) { 56 if (position <= 0 || position >= this.imageUrls.length) { 57 throw new IllegalArgumentException( 58 "position<=0||position>=this.imageUrls.length"); 59 } 60 return this.imageUrls[position]; 61 } 62 63 @Override 64 public long getItemId(int position) { 65 return position; 66 } 67 68 @Override 69 public View getView(int position, View convertView, ViewGroup parent) { 70 // 判断这个image是否已经在缓存当中,如果没有就下载 71 final ViewHolder holder; 72 if (convertView == null) { 73 holder = new ViewHolder(); 74 gridViewItem = (LinearLayout) getLayoutInflater().inflate( 75 R.layout.image_wall_item, null); 76 holder.imageView = (ImageView) gridViewItem 77 .findViewById(R.id.item_image); 78 holder.progressBar = (ProgressBar) gridViewItem 79 .findViewById(R.id.item_process); 80 gridViewItem.setTag(holder); 81 convertView = gridViewItem; 82 } else { 83 holder = (ViewHolder) gridViewItem.getTag(); 84 } 85 this.imageLoad.displayImage(this.imageUrls[position], 86 holder.imageView, options, 87 new SimpleImageLoadingListener() { 88 89 @Override 90 public void onLoadingStarted(String imageUri, View view) { 91 holder.progressBar.setProgress(0); 92 holder.progressBar.setVisibility(View.VISIBLE); 93 } 94 95 @Override 96 public void onLoadingFailed(String imageUri, View view, 97 FailReason failReason) { 98 holder.progressBar.setVisibility(View.GONE); 99 } 100 101 @Override 102 public void onLoadingComplete(String imageUri, 103 View view, Bitmap loadedImage) { 104 holder.progressBar.setVisibility(View.GONE); 105 } 106 107 }, new ImageLoadingProgressListener() { 108 109 @Override 110 public void onProgressUpdate(String imageUri, 111 View view, int current, int total) { 112 holder.progressBar.setProgress(Math.round(100.0f 113 * current / total)); 114 } 115 }); // 通过URL判断图片是否已经下载 116 return convertView; 117 } 118 119 } 120 }
里面主要的对象都用 突出显示了。
三者的关系
ImageLoaderConfiguration是针对图片缓存的全局配置,主要有线程类、缓存大小、磁盘大小、图片下载与解析、日志方面的配置。ImageLoader是具体下载图片,缓存图片,显示图片的具体执行类,它有两个具体的方法displayImage(...)、loadImage(...),但是其实最终他们的实现都是displayImage(...)。
DisplayImageOptions用于指导每一个Imageloader根据网络图片的状态(空白、下载错误、正在下载)显示对应的图片,是否将缓存加载到磁盘上,下载完后对图片进行怎么样的处理。
从三者的协作关系上看,他们有点像厨房规定、厨师、客户个人口味之间的关系。ImageLoaderConfiguration就像是厨房里面的规定,每一个厨师要怎么着装,要怎么保持厨房的干净,这是针对每一个厨师都适用的规定,而且不允许个性化改变。ImageLoader就像是具体做菜的厨师,负责具体菜谱的制作。DisplayImageOptions就像每个客户的偏好,根据客户是重口味还是清淡,每一个imageLoader根据DisplayImageOptions的要求具体执行。
ImageLoaderConfiguration
在上面的示例代码中,我们使用ImageLoaderConfiguration的默认配置,下面给出ImageLoaderConfiguration比较详尽的配置,从下面的配置中,可以看出ImageLoaderConfiguration的配置主要是全局性的配置,主要有线程类、缓存大小、磁盘大小、图片下载与解析、日志方面的配置。ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context) .memoryCacheExtraOptions(480, 800) // default = device screen dimensions .diskCacheExtraOptions(480, 800, null) .taskExecutor(...) .taskExecutorForCachedImages(...) .threadPoolSize(3) // default .threadPriority(Thread.NORM_PRIORITY - 1) // default .tasksProcessingOrder(QueueProcessingType.FIFO) // default .denyCacheImageMultipleSizesInMemory() .memoryCache(new LruMemoryCache(2 * 1024 * 1024)) .memoryCacheSize(2 * 1024 * 1024) .memoryCacheSizePercentage(13) // default .diskCache(new UnlimitedDiscCache(cacheDir)) // default .diskCacheSize(50 * 1024 * 1024) .diskCacheFileCount(100) .diskCacheFileNameGenerator(new HashCodeFileNameGenerator()) // default .imageDownloader(new BaseImageDownloader(context)) // default .imageDecoder(new BaseImageDecoder()) // default .defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default .writeDebugLogs() .build();
ImageLoaderConfiguration的主要职责就是记录相关的配置,它的内部其实就是一些字段的集合(如下面的源代码)。它有一个builder的内部类,这个类中的字段跟ImageLoaderConfiguration中的字段完全一致,它有一些默认值,通过修改builder可以配置ImageLoaderConfiguration。
![](http://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
View
Code
Display Options
每一个ImageLoader.displayImage(...)都可以使用Display
Options。
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) .cacheInMemory(false) // default .cacheOnDisk(false) // default .preProcessor(...) .postProcessor(...) .extraForDownloader(...) .considerExifParams(false) // default .imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2) // default .bitmapConfig(Bitmap.Config.ARGB_8888) // default .decodingOptions(...) .displayer(new SimpleBitmapDisplayer()) // default .handler(new Handler()) // default .build();
Display Options的主要职责就是记录相关的配置,它的内部其实就是一些字段的集合(如下面的源代码)。它有一个builder的内部类,这个类中的字段跟DisplayOption中的字段完全一致,它有一些默认值,通过修改builder可以配置DisplayOptions。
![](http://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif)
1 public final class DisplayImageOptions { 2 3 private final int imageResOnLoading; 4 private final int imageResForEmptyUri; 5 private final int imageResOnFail; 6 private final Drawable imageOnLoading; 7 private final Drawable imageForEmptyUri; 8 private final Drawable imageOnFail; 9 private final boolean resetViewBeforeLoading; 10 private final boolean cacheInMemory; 11 private final boolean cacheOnDisk; 12 private final ImageScaleType imageScaleType; 13 private final Options decodingOptions; 14 private final int delayBeforeLoading; 15 private final boolean considerExifParams; 16 private final Object extraForDownloader; 17 private final BitmapProcessor preProcessor; 18 private final BitmapProcessor postProcessor; 19 private final BitmapDisplayer displayer; 20 private final Handler handler; 21 private final boolean isSyncLoading; 22 23 private DisplayImageOptions(Builder builder) { 24 imageResOnLoading = builder.imageResOnLoading; 25 imageResForEmptyUri = builder.imageResForEmptyUri; 26 imageResOnFail = builder.imageResOnFail; 27 imageOnLoading = builder.imageOnLoading; 28 imageForEmptyUri = builder.imageForEmptyUri; 29 imageOnFail = builder.imageOnFail; 30 resetViewBeforeLoading = builder.resetViewBeforeLoading; 31 cacheInMemory = builder.cacheInMemory; 32 cacheOnDisk = builder.cacheOnDisk; 33 imageScaleType = builder.imageScaleType; 34 decodingOptions = builder.decodingOptions; 35 delayBeforeLoading = builder.delayBeforeLoading; 36 considerExifParams = builder.considerExifParams; 37 extraForDownloader = builder.extraForDownloader; 38 preProcessor = builder.preProcessor; 39 postProcessor = builder.postProcessor; 40 displayer = builder.displayer; 41 handler = builder.handler; 42 isSyncLoading = builder.isSyncLoading; 43 } 44 45 public boolean shouldShowImageOnLoading() { 46 return imageOnLoading != null || imageResOnLoading != 0; 47 } 48 49 public boolean shouldShowImageForEmptyUri() { 50 return imageForEmptyUri != null || imageResForEmptyUri != 0; 51 } 52 53 public boolean shouldShowImageOnFail() { 54 return imageOnFail != null || imageResOnFail != 0; 55 } 56 57 public boolean shouldPreProcess() { 58 return preProcessor != null; 59 } 60 61 public boolean shouldPostProcess() { 62 return postProcessor != null; 63 } 64 65 public boolean shouldDelayBeforeLoading() { 66 return delayBeforeLoading > 0; 67 } 68 69 public Drawable getImageOnLoading(Resources res) { 70 return imageResOnLoading != 0 ? res.getDrawable(imageResOnLoading) : imageOnLoading; 71 } 72 73 public Drawable getImageForEmptyUri(Resources res) { 74 return imageResForEmptyUri != 0 ? res.getDrawable(imageResForEmptyUri) : imageForEmptyUri; 75 } 76 77 public Drawable getImageOnFail(Resources res) { 78 return imageResOnFail != 0 ? res.getDrawable(imageResOnFail) : imageOnFail; 79 } 80 81 public boolean isResetViewBeforeLoading() { 82 return resetViewBeforeLoading; 83 } 84 85 public boolean isCacheInMemory() { 86 return cacheInMemory; 87 } 88 89 public boolean isCacheOnDisk() { 90 return cacheOnDisk; 91 } 92 93 public ImageScaleType getImageScaleType() { 94 return imageScaleType; 95 } 96 97 public Options getDecodingOptions() { 98 return decodingOptions; 99 } 100 101 public int getDelayBeforeLoading() { 102 return delayBeforeLoading; 103 } 104 105 public boolean isConsiderExifParams() { 106 return considerExifParams; 107 } 108 109 public Object getExtraForDownloader() { 110 return extraForDownloader; 111 } 112 113 public BitmapProcessor getPreProcessor() { 114 return preProcessor; 115 } 116 117 public BitmapProcessor getPostProcessor() { 118 return postProcessor; 119 } 120 121 public BitmapDisplayer getDisplayer() { 122 return displayer; 123 } 124 125 public Handler getHandler() { 126 return handler; 127 } 128 129 boolean isSyncLoading() { 130 return isSyncLoading; 131 } 132 133 /** 134 * Builder for {@link DisplayImageOptions} 135 * 136 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com) 137 */ 138 public static class Builder { 139 private int imageResOnLoading = 0; 140 private int imageResForEmptyUri = 0; 141 private int imageResOnFail = 0; 142 private Drawable imageOnLoading = null; 143 private Drawable imageForEmptyUri = null; 144 private Drawable imageOnFail = null; 145 private boolean resetViewBeforeLoading = false; 146 private boolean cacheInMemory = false; 147 private boolean cacheOnDisk = false; 148 private ImageScaleType imageScaleType = ImageScaleType.IN_SAMPLE_POWER_OF_2; 149 private Options decodingOptions = new Options(); 150 private int delayBeforeLoading = 0; 151 private boolean considerExifParams = false; 152 private Object extraForDownloader = null; 153 private BitmapProcessor preProcessor = null; 154 private BitmapProcessor postProcessor = null; 155 private BitmapDisplayer displayer = DefaultConfigurationFactory.createBitmapDisplayer(); 156 private Handler handler = null; 157 private boolean isSyncLoading = false; 158 159 public Builder() { 160 decodingOptions.inPurgeable = true; 161 decodingOptions.inInputShareable = true; 162 } 163 164 /** 165 * Stub image will be displayed in {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 166 * image aware view} during image loading 167 * 168 * @param imageRes Stub image resource 169 * @deprecated Use {@link #showImageOnLoading(int)} instead 170 */ 171 @Deprecated 172 public Builder showStubImage(int imageRes) { 173 imageResOnLoading = imageRes; 174 return this; 175 } 176 177 /** 178 * Incoming image will be displayed in {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 179 * image aware view} during image loading 180 * 181 * @param imageRes Image resource 182 */ 183 public Builder showImageOnLoading(int imageRes) { 184 imageResOnLoading = imageRes; 185 return this; 186 } 187 188 /** 189 * Incoming drawable will be displayed in {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 190 * image aware view} during image loading. 191 * This option will be ignored if {@link DisplayImageOptions.Builder#showImageOnLoading(int)} is set. 192 */ 193 public Builder showImageOnLoading(Drawable drawable) { 194 imageOnLoading = drawable; 195 return this; 196 } 197 198 /** 199 * Incoming image will be displayed in {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 200 * image aware view} if empty URI (null or empty 201 * string) will be passed to <b>ImageLoader.displayImage(...)</b> method. 202 * 203 * @param imageRes Image resource 204 */ 205 public Builder showImageForEmptyUri(int imageRes) { 206 imageResForEmptyUri = imageRes; 207 return this; 208 } 209 210 /** 211 * Incoming drawable will be displayed in {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 212 * image aware view} if empty URI (null or empty 213 * string) will be passed to <b>ImageLoader.displayImage(...)</b> method. 214 * This option will be ignored if {@link DisplayImageOptions.Builder#showImageForEmptyUri(int)} is set. 215 */ 216 public Builder showImageForEmptyUri(Drawable drawable) { 217 imageForEmptyUri = drawable; 218 return this; 219 } 220 221 /** 222 * Incoming image will be displayed in {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 223 * image aware view} if some error occurs during 224 * requested image loading/decoding. 225 * 226 * @param imageRes Image resource 227 */ 228 public Builder showImageOnFail(int imageRes) { 229 imageResOnFail = imageRes; 230 return this; 231 } 232 233 /** 234 * Incoming drawable will be displayed in {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 235 * image aware view} if some error occurs during 236 * requested image loading/decoding. 237 * This option will be ignored if {@link DisplayImageOptions.Builder#showImageOnFail(int)} is set. 238 */ 239 public Builder showImageOnFail(Drawable drawable) { 240 imageOnFail = drawable; 241 return this; 242 } 243 244 /** 245 * {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 246 * image aware view} will be reset (set <b>null</b>) before image loading start 247 * 248 * @deprecated Use {@link #resetViewBeforeLoading(boolean) resetViewBeforeLoading(true)} instead 249 */ 250 public Builder resetViewBeforeLoading() { 251 resetViewBeforeLoading = true; 252 return this; 253 } 254 255 /** 256 * Sets whether {@link com.nostra13.universalimageloader.core.imageaware.ImageAware 257 * image aware view} will be reset (set <b>null</b>) before image loading start 258 */ 259 public Builder resetViewBeforeLoading(boolean resetViewBeforeLoading) { 260 this.resetViewBeforeLoading = resetViewBeforeLoading; 261 return this; 262 } 263 264 /** 265 * Loaded image will be cached in memory 266 * 267 * @deprecated Use {@link #cacheInMemory(boolean) cacheInMemory(true)} instead 268 */ 269 @Deprecated 270 public Builder cacheInMemory() { 271 cacheInMemory = true; 272 return this; 273 } 274 275 /** Sets whether loaded image will be cached in memory */ 276 public Builder cacheInMemory(boolean cacheInMemory) { 277 this.cacheInMemory = cacheInMemory; 278 return this; 279 } 280 281 /** 282 * Loaded image will be cached on disk 283 * 284 * @deprecated Use {@link #cacheOnDisk(boolean) cacheOnDisk(true)} instead 285 */ 286 @Deprecated 287 public Builder cacheOnDisc() { 288 return cacheOnDisk(true); 289 } 290 291 /** 292 * Sets whether loaded image will be cached on disk 293 * 294 * @deprecated Use {@link #cacheOnDisk(boolean)} instead 295 */ 296 @Deprecated 297 public Builder cacheOnDisc(boolean cacheOnDisk) { 298 return cacheOnDisk(cacheOnDisk); 299 } 300 301 /** Sets whether loaded image will be cached on disk */ 302 public Builder cacheOnDisk(boolean cacheOnDisk) { 303 this.cacheOnDisk = cacheOnDisk; 304 return this; 305 } 306 307 /** 308 * Sets {@linkplain ImageScaleType scale type} for decoding image. This parameter is used while define scale 309 * size for decoding image to Bitmap. Default value - {@link ImageScaleType#IN_SAMPLE_POWER_OF_2} 310 */ 311 public Builder imageScaleType(ImageScaleType imageScaleType) { 312 this.imageScaleType = imageScaleType; 313 return this; 314 } 315 316 /** Sets {@link Bitmap.Config bitmap config} for image decoding. Default value - {@link Bitmap.Config#ARGB_8888} */ 317 public Builder bitmapConfig(Bitmap.Config bitmapConfig) { 318 if (bitmapConfig == null) throw new IllegalArgumentException("bitmapConfig can't be null"); 319 decodingOptions.inPreferredConfig = bitmapConfig; 320 return this; 321 } 322 323 /** 324 * Sets options for image decoding.<br /> 325 * <b>NOTE:</b> {@link Options#inSampleSize} of incoming options will <b>NOT</b> be considered. Library 326 * calculate the most appropriate sample size itself according yo {@link #imageScaleType(ImageScaleType)} 327 * options.<br /> 328 * <b>NOTE:</b> This option overlaps {@link #bitmapConfig(android.graphics.Bitmap.Config) bitmapConfig()} 329 * option. 330 */ 331 public Builder decodingOptions(Options decodingOptions) { 332 if (decodingOptions == null) throw new IllegalArgumentException("decodingOptions can't be null"); 333 this.decodingOptions = decodingOptions; 334 return this; 335 } 336 337 /** Sets delay time before starting loading task. Default - no delay. */ 338 public Builder delayBeforeLoading(int delayInMillis) { 339 this.delayBeforeLoading = delayInMillis; 340 return this; 341 } 342 343 /** Sets auxiliary object which will be passed to {@link ImageDownloader#getStream(String, Object)} */ 344 public Builder extraForDownloader(Object extra) { 345 this.extraForDownloader = extra; 346 return this; 347 } 348 349 /** Sets whether ImageLoader will consider EXIF parameters of JPEG image (rotate, flip) */ 350 public Builder considerExifParams(boolean considerExifParams) { 351 this.considerExifParams = considerExifParams; 352 return this; 353 } 354 355 /** 356 * Sets bitmap processor which will be process bitmaps before they will be cached in memory. So memory cache 357 * will contain bitmap processed by incoming preProcessor.<br /> 358 * Image will be pre-processed even if caching in memory is disabled. 359 */ 360 public Builder preProcessor(BitmapProcessor preProcessor) { 361 this.preProcessor = preProcessor; 362 return this; 363 } 364 365 /** 366 * Sets bitmap processor which will be process bitmaps before they will be displayed in 367 * {@link com.nostra13.universalimageloader.core.imageaware.ImageAware image aware view} but 368 * after they'll have been saved in memory cache. 369 */ 370 public Builder postProcessor(BitmapProcessor postProcessor) { 371 this.postProcessor = postProcessor; 372 return this; 373 } 374 375 /** 376 * Sets custom {@link BitmapDisplayer displayer} for image loading task. Default value - 377 * {@link DefaultConfigurationFactory#createBitmapDisplayer()} 378 */ 379 public Builder displayer(BitmapDisplayer displayer) { 380 if (displayer == null) throw new IllegalArgumentException("displayer can't be null"); 381 this.displayer = displayer; 382 return this; 383 } 384 385 Builder syncLoading(boolean isSyncLoading) { 386 this.isSyncLoading = isSyncLoading; 387 return this; 388 } 389 390 /** 391 * Sets custom {@linkplain Handler handler} for displaying images and firing {@linkplain ImageLoadingListener 392 * listener} events. 393 */ 394 public Builder handler(Handler handler) { 395 this.handler = handler; 396 return this; 397 } 398 399 /** Sets all options equal to incoming options */ 400 public Builder cloneFrom(DisplayImageOptions options) { 401 imageResOnLoading = options.imageResOnLoading; 402 imageResForEmptyUri = options.imageResForEmptyUri; 403 imageResOnFail = options.imageResOnFail; 404 imageOnLoading = options.imageOnLoading; 405 imageForEmptyUri = options.imageForEmptyUri; 406 imageOnFail = options.imageOnFail; 407 resetViewBeforeLoading = options.resetViewBeforeLoading; 408 cacheInMemory = options.cacheInMemory; 409 cacheOnDisk = options.cacheOnDisk; 410 imageScaleType = options.imageScaleType; 411 decodingOptions = options.decodingOptions; 412 delayBeforeLoading = options.delayBeforeLoading; 413 considerExifParams = options.considerExifParams; 414 extraForDownloader = options.extraForDownloader; 415 preProcessor = options.preProcessor; 416 postProcessor = options.postProcessor; 417 displayer = options.displayer; 418 handler = options.handler; 419 isSyncLoading = options.isSyncLoading; 420 return this; 421 } 422 423 /** Builds configured {@link DisplayImageOptions} object */ 424 public DisplayImageOptions build() { 425 return new DisplayImageOptions(this); 426 } 427 } 428 429 /** 430 * Creates options appropriate for single displaying: 431 * <ul> 432 * <li>View will <b>not</b> be reset before loading</li> 433 * <li>Loaded image will <b>not</b> be cached in memory</li> 434 * <li>Loaded image will <b>not</b> be cached on disk</li> 435 * <li>{@link ImageScaleType#IN_SAMPLE_POWER_OF_2} decoding type will be used</li> 436 * <li>{@link Bitmap.Config#ARGB_8888} bitmap config will be used for image decoding</li> 437 * <li>{@link SimpleBitmapDisplayer} will be used for image displaying</li> 438 * </ul> 439 * <p/> 440 * These option are appropriate for simple single-use image (from drawables or from Internet) displaying. 441 */ 442 public static DisplayImageOptions createSimple() { 443 return new Builder().build(); 444 } 445 }
相关文章推荐
- android中一个activity的生命周期试验记录
- android 显式 隐式启动activity
- Android数据库框架——GreenDao轻量级的对象关系映射框架,永久告别sqlite
- Android数据库框架——GreenDao轻量级的对象关系映射框架,永久告别sqlite
- Activity启动方式的总结(1)
- Gradle介绍
- 【Android】在图片上画其他内容的方法
- 【Android单元测试】如何在InstrumentationTestCase中获取Context对象
- android-----滑动冲突解决案例
- Fiddler对Android模拟器(Genymotion&Android模拟器)抓包
- 极光推送的使用
- DirectionControlView 一个方向控制自定义View
- Android Fragment 真正的完全解析(下)
- Android Fragment 真正的完全解析(上)
- Android项目Tab类型主界面大总结 Fragment+TabPageIndicator+ViewPager
- Android 复习2 有关activity
- 在android下使用opencv
- 创建一个Android程序
- 绑定本地Service并与之通信
- ubuntu16安装android studio2.1