参考：
Glide —— 替换资源加载组件
Android Glide4.0+图片加载进度监听
主要的6文件：
ProgressGlideModel,
ProgressInterceptor,ProgressListener,ProgressResponseBody
OkHttpUrlLoader,OkHttpStreamFetcher
1.ProgressGlideModel由于使用的是InputStream.class来加载资源，而Glide本身有这个组件，因此需要将此组件替换。
@GlideModule
public class ProgressGlideModel extends AppGlideModule {
public ProgressGlideModel() {
super();
}
@Override
public boolean isManifestParsingEnabled() {
return super.isManifestParsingEnabled();
}
@Override
public void applyOptions(@NonNull Context context, @NonNull GlideBuilder builder) {
super.applyOptions(context, builder);
}
@Override
public void registerComponents(@NonNull Context context, @NonNull Glide glide, @NonNull Registry registry) {
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.addInterceptor(new ProgressInterceptor())
.build();
registry.replace(GlideUrl.class, InputStream.class, new OkHttpUrlLoader.Factory(okHttpClient));
}
}
2.ProgressInterceptor为拦截器，监听进度的关键
public class ProgressInterceptor implements Interceptor {
public static final Map LISTENER_MAP = new HashMap<>();
public static void addListener(String url, ProgressListener listener) {
LISTENER_MAP.put(url, listener);
}
public static void removeListener(String url) {
LISTENER_MAP.remove(url);
}
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
Response response = chain.proceed(request);
String url = request.url().toString();
ResponseBody body = response.body();
Response newResponse = response.newBuilder().body(new ProgressResponseBody(url, body)).build();
return newResponse;
}
}
-
ProgressListener进度回调
public interface ProgressListener {
void onProgress(int progress);
}
-
ProgressResponseBody对ResponseBody改写
public class ProgressResponseBody extends ResponseBody {
private static final String TAG = "ProgressResponseBody";
private BufferedSource bufferedSource;
private ResponseBody responseBody;
private ProgressListener listener;
public ProgressResponseBody(String url, ResponseBody responseBody) {
this.responseBody = responseBody;
listener = ProgressInterceptor.LISTENER_MAP.get(url);
}
@Override
public MediaType contentType() {
return responseBody.contentType();
}
@Override
public long contentLength() {
return responseBody.contentLength();
}
@Override
public BufferedSource source() {
if (bufferedSource == null) {
bufferedSource = Okio.buffer(new ProgressSource(responseBody.source()));
}
return bufferedSource;
}
private class ProgressSource extends ForwardingSource {
long totalBytesRead = 0;
int currentProgress;
ProgressSource(Source source) {
super(source);
}
@Override
public long read(Buffer sink, long byteCount) throws IOException {
long bytesRead = super.read(sink, byteCount);
long fullLength = responseBody.contentLength();
if (bytesRead == -1) {
totalBytesRead = fullLength;
} else {
totalBytesRead += bytesRead;
}
int progress = (int) (100f * totalBytesRead / fullLength);
Log.d(TAG, "download progress is " + progress);
if (listener != null && progress != currentProgress) {
listener.onProgress(progress);
}
if (listener != null && totalBytesRead == fullLength) {
listener = null;
}
currentProgress = progress;
return bytesRead;
}
}
}
3.OkHttpUrlLoader创建模组加载类实现ModelLoader
public class OkHttpUrlLoader implements ModelLoader {
private final Call.Factory client;
public OkHttpUrlLoader(Call.Factory client) {
this.client = client;
}
@Override
public boolean handles(GlideUrl url) {
return true;
}
@Override
public LoadData buildLoadData(GlideUrl model, int width, int height,
Options options) {
return new LoadData<>(model, new OkHttpStreamFetcher(client, model));
}
public static class Factory implements ModelLoaderFactory {
private static volatile Call.Factory internalClient;
private final Call.Factory client;
private static Call.Factory getInternalClient() {
if (internalClient == null) {
synchronized (Factory.class) {
if (internalClient == null) {
internalClient = new OkHttpClient();
}
}
}
return internalClient;
}
public Factory() {
this(getInternalClient());
}
public Factory(Call.Factory client) {
this.client = client;
}
@Override
public ModelLoader build(MultiModelLoaderFactory multiFactory) {
return new OkHttpUrlLoader(client);
}
@Override
public void teardown() {
}
}
}
-
OkHttpStreamFetcher创建数据获取类继承DataFetcher
public class OkHttpStreamFetcher implements DataFetcher, okhttp3.Callback {
private static final String TAG = "OkHttpFetcher";
private final Call.Factory client;
private final GlideUrl url;
@SuppressWarnings("WeakerAccess")
@Synthetic
InputStream stream;
@SuppressWarnings("WeakerAccess")
@Synthetic
ResponseBody responseBody;
private volatile Call call;
private DataCallback callback;
// Public API.
@SuppressWarnings("WeakerAccess")
public OkHttpStreamFetcher(Call.Factory client, GlideUrl url) {
this.client = client;
this.url = url;
}
@Override
public void loadData(Priority priority, final DataCallback callback) {
Request.Builder requestBuilder = new Request.Builder().url(url.toStringUrl());
for (Map.Entry headerEntry : url.getHeaders().entrySet()) {
String key = headerEntry.getKey();
requestBuilder.addHeader(key, headerEntry.getValue());
}
Request request = requestBuilder.build();
this.callback = callback;
call = client.newCall(request);
if (Build.VERSION.SDK_INT != Build.VERSION_CODES.O) {
call.enqueue(this);
} else {
try {
// Calling execute instead of enqueue is a workaround for #2355, where okhttp throws a
// ClassCastException on O.
onResponse(call, call.execute());
} catch (IOException e) {
onFailure(call, e);
} catch (ClassCastException e) {
// It's not clear that this catch is necessary, the error may only occur even on O if
// enqueue is used.
onFailure(call, new IOException("Workaround for framework bug on O", e));
}
}
}
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e) {
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "OkHttp failed to obtain result", e);
}
callback.onLoadFailed(e);
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
responseBody = response.body();
if (response.isSuccessful()) {
long contentLength = Preconditions.checkNotNull(responseBody).contentLength();
stream = ContentLengthInputStream.obtain(responseBody.byteStream(), contentLength);
callback.onDataReady(stream);
} else {
callback.onLoadFailed(new HttpException(response.message(), response.code()));
}
}
@Override
public void cleanup() {
try {
if (stream != null) {
stream.close();
}
} catch (IOException e) {
// Ignored
}
if (responseBody != null) {
responseBody.close();
}
callback = null;
}
@Override
public void cancel() {
Call local = call;
if (local != null) {
local.cancel();
}
}
@NonNull
@Override
public Class getDataClass() {
return InputStream.class;
}
@NonNull
@Override
public DataSource getDataSource() {
return DataSource.REMOTE;
}
}
4.根据地址监听
ProgressInterceptor.addListener(uri, new ProgressListener() {
@Override
public void onProgress(int progress) {
L.e("onProgress: " + progress);
}
});
Glide.with(imageView)
.load(uri)
.apply(options)
.addListener(new RequestListener() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target target, boolean isFirstResource) {
ProgressInterceptor.removeListener(uri);
L.e("onProgress: 加载失败");
return false;
}
@Override
public boolean onResourceReady(Drawable resource, Object model, Target target, DataSource dataSource, boolean isFirstResource) {
ProgressInterceptor.removeListener(uri);
L.e("onProgress: 加载成功");
return false;
}
})
.into(imageView);
GIF.gif
问题一：设置监听进度后，全站所有的加载图片都会监听进度，明显感觉加载图片的速度慢了很多。
解决：原来是公司网速太慢，多试了几次发现去掉进度监听和不去都一样慢。