图片加载引擎框架封装

布满荆棘的人生 2021-09-28 15:12 341阅读 0赞

#### 一、新建接口编写加载方式 ####

public interface IImageLoader {
        void load(@NonNull ImageView imageView, @NonNull Object imageUrl);
        void load(@NonNull ImageView imageView, @NonNull Object imageUrl,int width, int height);
        void load(@NonNull ImageView imageView, @NonNull Object imageUrl,  int errorImage,int width, int height);
        void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int defaultImage, int errorImage,int width, int height);
        void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int defaultImage, int errorImage,int width, int height,@NonNull Object transformation);
        void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int errorImage,int width, int height,@NonNull Object transformation);
        void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int width, int height,@NonNull Object transformation);
        void load(@NonNull ImageView imageView, @NonNull Object imageUrl,@NonNull Object transformation);
    }

#### 二、创建实现类实现接口去加载 ####

public class ImageLoaderImpl implements IImageLoader{
    
        private static IImageLoader imageLoader;
        private static ImageLoaderImpl imageLoaderImpl;
    
        public static void init(IImageLoader imageLoader2){
            imageLoader = imageLoader2;
    
        }
    
        private ImageLoaderImpl() {
        }
    
        public static ImageLoaderImpl getInstance() {
            if (imageLoader == null) {
                throw new NullPointerException("必须在入口初始化imageLoader加载器引擎");
            }
            if(null==imageLoaderImpl){
                synchronized (ImageLoaderImpl.class){
                    if(null==imageLoaderImpl) {
                        imageLoaderImpl = new ImageLoaderImpl();
                    }
                }
            }
            return imageLoaderImpl;
        }
    
    
    
        @Override
        public void load(@NonNull ImageView imageView, @NonNull Object imageUrl) {
            imageLoader.load(imageView,imageUrl);
        }
    
        @Override
        public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int width, int height) {
            imageLoader.load(imageView,imageUrl,width,height);
        }
    
        @Override
        public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int errorImage, int width, int height) {
            imageLoader.load(imageView,imageUrl,errorImage,width,height);
        }
    
        @Override
        public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int defaultImage, int errorImage, int width, int height) {
            imageLoader.load(imageView,imageUrl,defaultImage,errorImage,width,height);
        }
    
        @Override
        public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int defaultImage, int errorImage, int width, int height, @NonNull Object transformation) {
            imageLoader.load(imageView,imageUrl,defaultImage,errorImage,width,height,transformation);
        }
    
        @Override
        public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int errorImage, int width, int height, @NonNull Object transformation) {
            imageLoader.load(imageView,imageUrl,errorImage,width,height,transformation);
        }
    
        @Override
        public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int width, int height, @NonNull Object transformation) {
            imageLoader.load(imageView,imageUrl,width,height,transformation);
        }
    
        @Override
        public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, @NonNull Object transformation) {
            imageLoader.load(imageView,imageUrl,transformation);
        }
    }

#### 三、在程序入口处初始化实现类且自定义引擎 ####

> 一般在application的onCreate()方法里，当然如果为了启动速度，也可以把初始化放到mainActivity里

*  这里我使用glide演示

@SuppressLint("CheckResult")
        private void initImageLoader() {
            RequestOptions options = new RequestOptions();
            options.diskCacheStrategy(DiskCacheStrategy.RESOURCE)
                    .encodeQuality(98).dontAnimate();
            Application application = getApplication();
            ImageLoaderImpl.init(new IImageLoader() {
                @Override
                public void load(@NonNull ImageView imageView, @NonNull Object imageUrl) {
                    Glide.with(application).load(imageUrl).thumbnail(0.3f).apply(options).into(imageView);
                }
    
                @Override
                public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int width, int height) {
                    options.override(width,height);
                    Glide.with(application).load(imageUrl).thumbnail(0.3f).apply(options).into(imageView);
                }
    
                @Override
                public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int errorImage, int width, int height) {
                    options.override(width,height).error(errorImage);
                    Glide.with(application).load(imageUrl).thumbnail(0.3f).apply(options).into(imageView);
                }
    
                @Override
                public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int defaultImage, int errorImage, int width, int height) {
                    options.override(width,height).error(errorImage).placeholder(defaultImage);
                    Glide.with(application).load(imageUrl).thumbnail(0.3f).apply(options).into(imageView);
                }
    
                @Override
                public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int defaultImage, int errorImage, int width, int height, @NonNull Object transformation) {
                    options.override(width,height).error(errorImage).placeholder(defaultImage).transform((Transformation<Bitmap>) transformation);
                    Glide.with(application).load(imageUrl).thumbnail(0.3f).apply(options).into(imageView);
                }
    
                @Override
                public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int errorImage, int width, int height, @NonNull Object transformation) {
                    options.override(width,height).error(errorImage).transform((Transformation<Bitmap>) transformation);
                    Glide.with(application).load(imageUrl).thumbnail(0.3f).apply(options).into(imageView);
                }
    
                @Override
                public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, int width, int height, @NonNull Object transformation) {
                    options.override(width,height).transform((Transformation<Bitmap>) transformation);
                    Glide.with(application).load(imageUrl).thumbnail(0.3f).apply(options).into(imageView);
                }
    
                @Override
                public void load(@NonNull ImageView imageView, @NonNull Object imageUrl, @NonNull Object transformation) {
                    options.transform((Transformation<Bitmap>) transformation);
                    Glide.with(application).load(imageUrl).thumbnail(0.3f).apply(options).into(imageView);
                }
            });
        }