使用Glide预加载多个图像 [英] Preload multiple images with Glide

问题描述

我们正在尝试预加载图片到缓存中以便以后加载它们（图片位于应用程序的资源文件夹中）

We are trying to preload images into cache memory to load them later (the images are located in the Asset folder of the application)

我们尝试了什么：

Glide.with(this)
    .load(pictureUri)
    .diskCacheStrategy(DiskCacheStrategy.ALL);

Glide.with(this)
    .load(picture_uri)
    .diskCacheStrategy(DiskCacheStrategy.ALL)
    .preload();

问题：图片仅在我们尝试加载/显示时缓存：
它们必须在内存中加载才能显得更快。

The issue: Images are cached only when we are trying to load/display them: They have to be loaded in memory before so that they appear faster.

Glide.with(this)
    .load(picture_uri)
    .into(imageView);

我们还尝试使用GlideModule来增加CacheMemory大小：

We also tried to use a GlideModule to increase the CacheMemory size:

public class GlideModule implements com.bumptech.glide.module.GlideModule {
    @Override
    public void applyOptions(Context context, GlideBuilder
        builder.setMemoryCache(new LruResourceCache(100000));
    }

    @Override
    public void registerComponents(Context context, Glide glide) {
    }
}

在清单中：

 <meta-data android:name=".GlideModule" android:value="GlideModule"/>

到目前为止没有任何工作。任何想法？

Nothing is working so far. Any idea?

我们试图使用不可见的1 dp imageView，但结果是相同的：

We trying to use an invisible 1 dp imageView, but the result is the same:

for(Drawing drawing: getDrawingsForTab(tab)){

    Glide.with(this)
            .load(drawing.getImage().toUri())
            .dontAnimate()
            .diskCacheStrategy(DiskCacheStrategy.ALL)
            .into(mPreloadCacheIv);

    for(Picture picture : getPictures()){

        Glide.with(this)
                .load(picture.getPicture().toUri())
                .dontAnimate()
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .into(mPreloadCacheIv);
    }
}

推荐答案

最好的选择是自己处理缓存，它可以让你获得更多控制权。应该很容易，因为你已经知道要加载什么位图。

The best option is to handle caching yourself, it gives you more control & should be easy as you already know what bitmaps are to be loaded.

LruCache<String, Bitmap> memCache = new LruCache<>(size) {
    @Override
    protected int sizeOf(String key, Bitmap image) {
        return image.getByteCount()/1024;
    }
};

第二：将位图加载到LruCache

Second: Load the bitmaps to the LruCache

Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x; //width of screen in pixels
int height = size.y;//height of screen in pixels
Glide.with(context)
    .load(Uri.parse("file:///android_asset/imagefile"))
    .asBitmap()
    .fitCenter() //fits given dimensions maintaining ratio
    .into(new SimpleTarget(width,height) {
        @Override
        public void onResourceReady(Bitmap resource, GlideAnimation glideAnimation) {
            memCache.put("imagefile", resource);
        }
    });

第三：使用缓存的位图

Third: Use the cached bitmaps

Bitmap image = memCache.get("imagefile");
if (image != null) {
    //Bitmap exists in cache.
    imageView.setImageBitmap(image); 
} else {
    //Bitmap not found in cache reload it 
    Glide.with(context)
         .load(Uri.parse("file:///android_asset/imagefile"))
         .into(imageView);
}

这篇关于使用Glide预加载多个图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！