带进度的Glide图片加载源码

package com.example.glideprogresstest; import com.bumptech.glide.Priority; import com.bumptech.glide.load.data.DataFetcher; import com.bumptech.glide.load.model.GlideUrl; import com.bumptech.glide.util.ContentLengthInputStream; import java.io.IOException; import java.io.InputStream; import java.util.Map; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; import okhttp3.ResponseBody; /** * @author guolin * @since 2017/11/2 */ public class OkHttpFetcher implements DataFetcher<InputStream> { private final OkHttpClient client; private final GlideUrl url; private InputStream stream; private ResponseBody responseBody; private volatile boolean isCancelled; public OkHttpFetcher(OkHttpClient client, GlideUrl url) { this.client = client; this.url = url; } @Override public InputStream loadData(Priority priority) throws Exception { Request.Builder requestBuilder = new Request.Builder() .url(url.toStringUrl()); for (Map.Entry<String, String> headerEntry : url.getHeaders().entrySet()) { String key = headerEntry.getKey(); requestBuilder.addHeader(key, headerEntry.getValue()); } Request request = requestBuilder.build(); if (isCancelled) { return null; } Response response = client.newCall(request).execute(); responseBody = response.body(); if (!response.isSuccessful() || responseBody == null) { throw new IOException("Request failed with code: " + response.code()); } stream = ContentLengthInputStream.obtain(responseBody.byteStream(), responseBody.contentLength()); return stream; } @Override public void cleanup() { try { if (stream != null) { stream.close(); } if (responseBody != null) { responseBody.close(); } } catch (IOException e) { e.printStackTrace(); } } @Override public String getId() { return url.getCacheKey(); } @Override public void cancel() { isCancelled = true; } }