android – 如何使用Glide通过HTTP POST方法下载图像

2019年7月28日 403次阅读

服务器提供API以通过Post请求加载图像,其主体看起来像

{
 "image_id": someId,
 "session_id": "someId"
}

响应 – 流.
如何使用Glide通过HTTP POST方法下载图像？

最佳答案 使用Glide&amp ;;加载图像的算法通过HTTP POST方法改造2：

1)创建接口,应通过HTTP POST方法实现所有图像加载请求：

public interface CacheableRequest {
    String getCacheKey();
}

2)创建要加载的模型,该模型将用作Glide.with(context).load(model)的参数：

import java.io.IOException;
import java.io.InputStream;

import okhttp3.ResponseBody;
import retrofit2.Call;

public class RetrofitStream {

    private final Call<ResponseBody> call;
    private final CacheableRequest request;

    public RetrofitStream(Call<ResponseBody> call, CacheableRequest request) {
        this.call = call;
        this.request = request;
    }

    public InputStream getStream() throws IOException {
        return call.execute().body().byteStream();
    }

    public String getCacheKey() {
        return request.getCacheKey();
    }
}

3)创建com.bumptech.glide.load.data.DataFetcher的实现：

import android.support.annotation.Nullable;

import com.bumptech.glide.Priority;
import com.bumptech.glide.load.data.DataFetcher;

import java.io.IOException;
import java.io.InputStream;

public class RetrofitFetcher implements DataFetcher<InputStream> {

    private final RetrofitStream retrofitStream;
    private InputStream stream;

    public RetrofitFetcher(RetrofitStream retrofitStream) {
        this.retrofitStream = retrofitStream;
    }

    @Nullable
    @Override
    public InputStream loadData(Priority priority) throws Exception {
        return stream = retrofitStream.getStream();
    }

    @Override
    public void cleanup() {
        if (stream != null) {
            try {
                stream.close();
            } catch (IOException ignored) {
            }
        }
    }

    @Override
    public String getId() {
        return retrofitStream.getCacheKey();
    }

    @Override
    public void cancel() {

    }
}

4)创建com.bumptech.glide.load.model.ModelLoader的实现：

import android.content.Context;
import android.support.annotation.Keep;
import android.support.annotation.Nullable;

import com.bumptech.glide.load.data.DataFetcher;
import com.bumptech.glide.load.model.GenericLoaderFactory;
import com.bumptech.glide.load.model.ModelCache;
import com.bumptech.glide.load.model.ModelLoader;
import com.bumptech.glide.load.model.ModelLoaderFactory;

import java.io.InputStream;

public class RetrofitStreamLoader implements ModelLoader<RetrofitStream, InputStream> {

    private final ModelCache<RetrofitStream, RetrofitStream> modelCache;

    @Keep
    public RetrofitStreamLoader() {
        this(null);
    }

    public RetrofitStreamLoader(@Nullable ModelCache<RetrofitStream, RetrofitStream> modelCache) {
        this.modelCache = modelCache;
    }

    @Override
    public DataFetcher<InputStream> getResourceFetcher(RetrofitStream model, int width, int height) {
        // GlideUrls memoize parsed URLs so caching them saves a few object instantiations and time spent parsing urls.
        RetrofitStream stream = model;
        if (modelCache != null) {
            stream = modelCache.get(model, 0, 0);
            if (stream == null) {
                modelCache.put(model, 0, 0, model);
                stream = model;
            }
        }
        return new RetrofitFetcher(stream);
    }

    /**
     * The default factory for {@link RetrofitStreamLoader}s.
     */
    public static class Factory implements ModelLoaderFactory<RetrofitStream, InputStream> {

        private final ModelCache<RetrofitStream, RetrofitStream> modelCache = new ModelCache<>(500);

        @Override
        public ModelLoader<RetrofitStream, InputStream> build(Context context, GenericLoaderFactory factories) {
            return new RetrofitStreamLoader(modelCache);
        }

        @Override
        public void teardown() {
            // Do nothing.
        }
    }
}

5)创建GlideModule的实现,允许配置Glide

import android.content.Context;

import com.bumptech.glide.Glide;
import com.bumptech.glide.GlideBuilder;
import com.bumptech.glide.load.DecodeFormat;
import com.bumptech.glide.load.engine.cache.InternalCacheDiskCacheFactory;
import com.bumptech.glide.module.GlideModule;

import java.io.InputStream;

public class RetrofitGlideModule implements GlideModule {

    private final static int IMAGES_CACHE_MAX_BYTE_SIZE = 20 * 1024 * 1024;
    private final static String IMAGES_CACHE_PATH = "images";

    @Override
    public void applyOptions(Context context, GlideBuilder builder) {
        builder.setDiskCache(new InternalCacheDiskCacheFactory(context, IMAGES_CACHE_PATH, IMAGES_CACHE_MAX_BYTE_SIZE))
                .setDecodeFormat(DecodeFormat.PREFER_RGB_565);
    }

    @Override
    public void registerComponents(Context context, Glide glide) {
        glide.register(RetrofitStream.class, InputStream.class, new RetrofitStreamLoader.Factory());
    }
}

6)在AndroidManifest.xml中添加有关创建的RetrofitGlideModule的元数据

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

现在您可以下载图像：

Call<ResponseBody> call = retrofit.getImage(cacheableRequest);
Glide.with(context).load(new RetrofitStream(call, cacheableRequest)).into(imageView);
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