我正在使用UIL库编写自定义库,为了测试性能,我修改了ImagePagerActivity
(示例代码)以从sdcard加载图像。一切正常,但加载速度太慢,有时甚至需要5秒才能加载单个图像。但是,如果我使用内置库,它的速度更快,并在几毫秒内加载更多图像。以下是修改后的onCreate
File file = new File(Environment.getExternalStorageDirectory(), "dcim/100MEDIA/");
File[] images = file.listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String filename) {
return filename.toLowerCase(Locale.US).endsWith(".jpg");
}
});
String[] imageUrls = new String[images.length];
for (int a = 0; a < imageUrls.length; a++)
imageUrls[a] = "file://" + images[a].getAbsolutePath();
options = new DisplayImageOptions.Builder().showImageForEmptyUri(R.drawable.ic_empty)
.showImageOnFail(R.drawable.ic_error).resetViewBeforeLoading(true).cacheOnDisc(true)
.cacheInMemory(true).imageScaleType(ImageScaleType.EXACTLY).bitmapConfig(Bitmap.Config.RGB_565)
.displayer(new FadeInBitmapDisplayer(300)).build();
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this)
.defaultDisplayImageOptions(options).discCacheExtraOptions(800, 800, CompressFormat.PNG, 0, null)
.build();
ImageLoader.getInstance().init(config);
并且很少修改ImagePagerAdapter
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
spinner.setVisibility(View.GONE);
Toast.makeText(ImagePagerActivity.this, loadedImage.getWidth() + " x " + loadedImage.getHeight(),
Toast.LENGTH_SHORT).show();
}
通常常见的图片尺寸为2592x1552
UIL 1.8.6
Android版:4.0.3
其他与示例代码
相同答案 0 :(得分:0)
您的ImageLoaderConfiguration是什么样的?你设置了什么threadPriority?此外,ImageScaleType.EXACTLY创建另一个位图,因此这将增加加载时间。对于我的ImageLoaderConfiguration,我将threadPriority设置为Thread.MAX_PRIORITY,并将threadPoolSize设置为5:
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
getApplicationContext()).threadPriority(Thread.MAX_PRIORITY)
.memoryCacheSize(memoryCacheSize)
.memoryCache(new WeakMemoryCache())
.denyCacheImageMultipleSizesInMemory().threadPoolSize(5)
.discCacheFileNameGenerator(new MyFileNameGenerator())
.tasksProcessingOrder(QueueProcessingType.LIFO)// .enableLogging()
.build();