如何通过 HTTP POST 方法使用 Glide 下载图像

Question

服务器提供API通过Post请求加载图片，其body看起来像

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

响应 - 流。
如何通过 HTTP POST 方法使用 Glide 下载图像？

Answer 1

使用 Glide & Retrofit 2 通过 HTTP POST 方法加载图像的算法：

1) 创建接口，所有通过HTTP POST方法加载图片的请求都应实现该接口：

public interface CacheableRequest {
    String getCacheKey();
}

2) 创建要加载的模型，将作为 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 中添加关于创建的 RetrofitGlideModule 的元数据

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

现在您可以通过以下方式下载图片了：

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

Answer 2

首先你必须为上述响应创建一个模型对象

    Example : 

    import android.os.Parcel;
    import android.os.Parcelable;

    public class Movies implements Parcelable {
        private String poster_path;
        private String id;

        public Movies() {
        }

        private Movies(Parcel in) {
            poster_path = in.readString();
            id = in.readString();
        }

        public static final Creator<Movies> CREATOR = new Creator<Movies>() {
            @Override
            public Movies createFromParcel(Parcel in) {
                return new Movies(in);
            }

            @Override
            public Movies[] newArray(int size) {
                return new Movies[size];
            }
        };

        public String getPoster_path() {
            return poster_path;
        }

        public void setPoster_path(String poster_path) {
            this.poster_path = poster_path;
        }

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }


        @Override
        public int describeContents() {
            return 0;
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            dest.writeString(poster_path);
            dest.writeString(id);
        }
    }

根据响应创建模型后，我们需要保存这些数据。

   private void fetchTask(final String movieType) {

            if (jsonObjectRequest != null) {
                jsonObjectRequest.cancel();
                movies.clear();
            }
            Uri.Builder builder = new Uri.Builder();
            builder.scheme("https")
                    .authority("api.themoviedb.org")
                    .appendPath("3")
                    .appendPath("movie")
                    .appendPath(movieType)
                    .appendQueryParameter(MOVIE_API_KEY, MOVIE_API_VALUE);
            String url = builder.build().toString();
            jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {

                    try {
                        JSONArray jsonArray = response.getJSONArray(MovieModelConstants.MOVIE_RESULTS);
                        for (int i = 0; i < jsonArray.length(); i++) {
                            JSONObject jsonObject = jsonArray.getJSONObject(i);
                            Movies data = new Movies();
                            data.setPoster_path(jsonObject.getString(MOVIE_POSTER_PATH));
                            data.setId(jsonObject.getString(MOVIE_ID));
                            movies.add(data);
                        }
                        moviesAdapter = new MoviesAdapter(movies);
                        moviesAdapter.setItemClickListener(clickListener);
                        recyclerViewMovies.setAdapter(moviesAdapter);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {

                    Toast.makeText(getContext(), getString(R.string.errorMessage), Toast.LENGTH_SHORT);

                }
            });
            Volley.newRequestQueue(getContext()).add(jsonObjectRequest);
        }
    }

在适配器中你需要根据位置加载

Picasso.with(holder.mMovieItem.getContext()).load(generateUrlForPoster(String.valueOf(data.get(position).getPoster_path()))).into(holder.mMovieItem);

Answer 3

Glide 中没有这样的方法可以接收 post 请求的 url。

因此，您只需使用 HTTPUrlConnection 从请求中获取 bytes[]，然后使用 Glide 将此 bytes[] 加载到 imageView。

 Glide.with(context).load(byteArr).into(imageView);