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核心思想
使用策略模式实现不同图片加载框架的切换#xff0c;使用建造者设计模式处理不同参数#xff0c;最后通过 ImageLoader 进行管理。
定义策略… 文章目录 Android 优雅封装Glide核心思想定义策略接口定义图片选项实现Glide策略图片管理类使用 Android 优雅封装Glide
核心思想
使用策略模式实现不同图片加载框架的切换使用建造者设计模式处理不同参数最后通过 ImageLoader 进行管理。
定义策略接口
interface ILoaderStrategy {fun loadImage(configs: ImageOptions)fun clearDiskCache(context: Context)fun clearMemoryCache(context: Context)fun clearAll(context: Context) {clearDiskCache(context)clearMemoryCache(context)}fun clear(imageView: ImageView)
}定义图片选项
class ImageOptions private constructor() {var targetObj: Any? null // 生命周期对象var targetView: ImageView? null // 目标ImageViewvar resource: Any? null // 加载资源var width -1 // 指定宽度var height -1 // 指定高度var isDiskCache true // 磁盘缓存var isMemoryCache true // 内存缓存DrawableResvar placeholder: Int -1 // 占位图资源DrawableResvar error: Int -1 // 失败图资源var listener: Listener? nullcompanion object {fun create(): ImageOptions {return ImageOptions()}}fun with(targetObj: Any): ImageOptions {this.targetObj targetObjreturn this}fun loadResource(resource: Any): ImageOptions {this.resource resourcereturn this}fun size(size: Int): ImageOptions {return size(width, height)}fun size(width: Int, height: Int): ImageOptions {this.width widththis.height heightreturn this}fun placeholder(DrawableRes placeholder: Int): ImageOptions {this.placeholder placeholderreturn this}fun error(DrawableRes error: Int): ImageOptions {this.error errorreturn this}fun setDiskCache(isCache: Boolean): ImageOptions {isDiskCache isCachereturn this}fun setMemoryCache(isCache: Boolean): ImageOptions {isMemoryCache isCachereturn this}fun setListener(listener: Listener): ImageOptions {this.listener listenerreturn this}fun into(imageView: ImageView) {this.targetView imageViewImageLoader.loadOptions(this)}interface Listener {fun onSuccess(model: Any?)fun onFail(model: Any?)}
}实现Glide策略
class GlideLoader : ILoaderStrategy {private lateinit var requestManager: RequestManageroverride fun loadImage(options: ImageOptions) {requestManager getRequestManager(options.targetObj)var requestBuilder: RequestBuilderDrawable? nulloptions.resource?.let {requestBuilder generateRequestBuilder(it)}requestBuilder?.let {if (options.placeholder ! -1) {it.placeholder(options.placeholder)}if (options.error ! -1) {it.error(options.error)}if (options.width ! -1 || options.height ! -1) {it.override(options.width, options.height)}it.skipMemoryCache(options.isMemoryCache)it.diskCacheStrategy(if (options.isDiskCache) DiskCacheStrategy.AUTOMATIC else DiskCacheStrategy.NONE)options.listener?.let { listener -it.addListener(object : RequestListenerDrawable {override fun onLoadFailed(e: GlideException?,model: Any?,target: TargetDrawable?,isFirstResource: Boolean): Boolean {listener.onFail(model)return false}override fun onResourceReady(resource: Drawable?,model: Any?,target: TargetDrawable?,dataSource: DataSource?,isFirstResource: Boolean): Boolean {listener.onSuccess(model)return false}})}if (options.targetView null) {throw IllegalArgumentException(targetView cannot be null);}it.into(options.targetView!!)}}private fun getRequestManager(targetObj: Any?): RequestManager {return if (targetObj is FragmentActivity) {Glide.with(targetObj)} else if (targetObj is Context) {Glide.with(targetObj)} else if (targetObj is View) {Glide.with(targetObj)} else if (targetObj is Fragment) {Glide.with(targetObj)} else {throw IllegalArgumentException(You cannot start a load on a null Context);}}private fun generateRequestBuilder(res: Any): RequestBuilderDrawable? {return if (res is String) {requestManager.load(res)} else if (res is File) {requestManager.load(res)} else {return null}}override fun clearDiskCache(context: Context) {thread {Glide.get(context).clearDiskCache()}}override fun clearMemoryCache(context: Context) {Glide.get(context).clearMemory()}override fun clear(imageView: ImageView) {Glide.with(imageView.context).clear(imageView)}
}图片管理类
object ImageLoader {private var imageLoader: ILoaderStrategy? nullfun setImageLoader(imageLoader: ILoaderStrategy) {this.imageLoader imageLoader}fun with(targetObj: Any): ImageOptions {val options ImageOptions.create()options.with(targetObj)return options}fun loadOptions(options: ImageOptions) {imageLoader!!.loadImage(options)}fun clearDiskCache(context: Context){imageLoader!!.clearDiskCache(context)}fun clearMemoryCache(context: Context){imageLoader!!.clearMemoryCache(context)}fun clearAll(context:Context){imageLoader!!.clearAll(context)}fun clear(imageView: ImageView){imageLoader!!.clear(imageView)}}使用
override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_image_loader)imageView0 findViewById(R.id.imageView0)imageView1 findViewById(R.id.imageView1)imageView2 findViewById(R.id.imageView2)ImageLoader.setImageLoader(GlideLoader())val url https://i-blog.csdnimg.cn/blog_migrate/de6e3262387d57977e53af596a87f582.pngImageLoader.with(this).loadResource(url).size(100).placeholder(R.mipmap.ic_launcher).error(R.mipmap.ic_launcher).into(imageView1)ImageLoader.with(this).loadResource(File(cacheDir, aaa.png)).placeholder(R.mipmap.ic_launcher).error(R.mipmap.ic_launcher).into(imageView2)
} ImageLoader.clear(imageView1)
ImageLoader.clearAll(this)
ImageLoader.clearMemoryCache(this)
ImageLoader.clearDiskCache(this)
