用于base64图像的自定义Glide ModelLoader-Java 学习之路

我有来自一些在base64中编码的SOAP API的图像 . 要使用Glide直接加载它我决定编写自定义ModelLoader .

Glide Version ：4.3.1

Glide load line ：

GlideApp.with(activity)
        .load(Data().apply { code = licensePlateData.licensePlateImgId })
        .into(view.imageLicense)

GlideModule ：

@GlideModule
class MyAppGlideModule : AppGlideModule() {

    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
        super.registerComponents(context, glide, registry)
        val app = context.applicationContext as MyApplication
        registry.append(Data::class.java, ByteArray::class.java, MyImageLoaderFactory(app.api))
    }
}

Loader ：

class MyImageLoaderFactory(private val api: Api) : ModelLoaderFactory<Data, ByteArray> {

    override fun teardown() {

    }

    override fun build(multiFactory: MultiModelLoaderFactory): ModelLoader<Data, ByteArray> {
        return MyImageLoader(api)
    }
}

class MyImageLoader(private val api: Api) : ModelLoader<Data, ByteArray> {

    override fun buildLoadData(model: Data, width: Int, height: Int, options: Options): ModelLoader.LoadData<ByteArray> {
        val key = "code:${model.code};width:$width;height:$height"
        return ModelLoader.LoadData<ByteArray>(ObjectKey(key), MyImageDataFetcher(api, GetImageRequest().apply { data = model }))
    }

    override fun handles(model: Data): Boolean {
        return true
    }
}

class MyImageDataFetcher(private val api: Api, private val request: GetImageRequest) : DataFetcher<ByteArray> {

    private val disposables = CompositeDisposable()

    override fun cleanup() {
        disposables.clear()
    }

    override fun loadData(priority: Priority, callback: DataFetcher.DataCallback<in ByteArray>) {
        api.getImage(request) //soap request
                .map { it.image.decodeBase64() } //translate String to ByteArray
                .subscribe({ callback.onDataReady(it) }, {
                    if (it is Exception) {
                        callback.onLoadFailed(it)
                    } else {
                        callback.onLoadFailed(MyException(it))
                    }
                })
                .addTo(disposables)
    }

    override fun cancel() {
        disposables.clear()
    }

    override fun getDataClass(): Class<ByteArray> {
        return ByteArray::class.java
    }

    override fun getDataSource(): DataSource {
        return DataSource.REMOTE
    }

}

Stack trace / LogCat ：

com.bumptech.glide.Registry $ NoSourceEncoderAvailableException：无法找到数据类的源编码器：com [bumptech.glide.Registry.getSourceEncoder（Registry.java:534）中的类[B，位于com.bumptech.glide.load.engine .decodeHelper.getSourceEncoder（DecodeHelper.java:232）at com.bumptech.glide.load.engine.SourceGenerator.cacheData（SourceGenerator.java:74）at com.bumptech.glide.load.engine.SourceGenerator.startNext（SourceGenerator.java）：45）在com.bumptech.glide.load.engine.DecodeJob.runGenerators（DecodeJob.java:298）的com.bumptech.glide.load.engine.DecodeJob.runWrapped（DecodeJob.java:268）com.bumptech上 . java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1162）中的glide.load.engine.DecodeJob.run（DecodeJob.java:229）at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java： 636）at java.lang.Thread.run（Thread.java:764）at com.bumptech.glide.load.engine.executor.GlideExecutor $ DefaultThreadFactory $ 1.run（GlideExecutor.java:413）

我认为我错过了让它发挥作用的东西 .

1 回答

感谢https://github.com/bumptech/glide/issues/2677的评论，我找到了解决方案 .

@GlideModule
class MyAppGlideModule : AppGlideModule() {

    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
        super.registerComponents(context, glide, registry)
        val app = context.applicationContext as MyApplication
        registry.append(Data::class.java, ByteBuffer::class.java, MyImageLoaderFactory(app.api))
    }
}

class MyImageLoaderFactory(private val api: Api) : ModelLoaderFactory<Data, ByteBuffer> {

    override fun teardown() {

    }

    override fun build(multiFactory: MultiModelLoaderFactory): ModelLoader<Data, ByteBuffer> {
        return MyImageLoader(api)
    }
}

class MyImageLoader(private val api: Api) : ModelLoader<Data, ByteBuffer> {

    override fun buildLoadData(model: Data, width: Int, height: Int, options: Options): ModelLoader.LoadData<ByteBuffer> {
        val key = "code:${model.code};width:$width;height:$height"
        return ModelLoader.LoadData<ByteBuffer>(ObjectKey(key), MyImageDataFetcher(api, GetImageRequest().apply { data = model }))
    }

    override fun handles(model: Data): Boolean {
        return true
    }
}

class ClmImageDataFetcher(private val api: Api, private val request: GetImageRequest) : DataFetcher<ByteBuffer> {

    private val disposables = CompositeDisposable()

    override fun cleanup() {
        disposables.clear()
    }

    override fun loadData(priority: Priority, callback: DataFetcher.DataCallback<in ByteBuffer>) {
        api.getImage(request)
                .map { it.image.decodeBase64() }
                .subscribe({ callback.onDataReady(ByteBuffer.wrap(it)) }, {
                    if (it is Exception) {
                        callback.onLoadFailed(it)
                    } else {
                        callback.onLoadFailed(MyException(it))
                    }
                })
                .addTo(disposables)
    }

    override fun cancel() {
        disposables.clear()
    }

    override fun getDataClass(): Class<ByteBuffer> {
        return ByteBuffer::class.java
    }

    override fun getDataSource(): DataSource {
        return DataSource.REMOTE
    }

}

回复于 2024-04-20T08:34:17+08:00

用于base64图像的自定义Glide ModelLoader

1 回答

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