/*
* Copyright (C) 2015 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okhttp3.recipes;
import java.io.IOException;
import okhttp3.Interceptor;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;
import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
import okio.Source;
public final class Progress {
public void run() throws Exception {
Request request = new Request.Builder()
.url("https://publicobject.com/helloworld.txt")
.build();
final ProgressListener progressListener = new ProgressListener() {
boolean firstUpdate = true;
@Override public void update(long bytesRead, long contentLength, boolean done) {
if (done) {
System.out.println("completed");
} else {
if (firstUpdate) {
firstUpdate = false;
if (contentLength == -1) {
System.out.println("content-length: unknown");
} else {
System.out.format("content-length: %d\n", contentLength);
}
}
System.out.println(bytesRead);
if (contentLength != -1) {
System.out.format("%d%% done\n", (100 * bytesRead) / contentLength);
}
}
}
};
OkHttpClient client = new OkHttpClient.Builder()
.addNetworkInterceptor(new Interceptor() {
@Override public Response intercept(Chain chain) throws IOException {
Response originalResponse = chain.proceed(chain.request());
return originalResponse.newBuilder()
.body(new ProgressResponseBody(originalResponse.body(), progressListener))
.build();
}
})
.build();
try (Response response = client.newCall(request).execute()) {
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
System.out.println(response.body().string());
}
}
public static void main(String... args) throws Exception {
new Progress().run();
}
private static class ProgressResponseBody extends ResponseBody {
private final ResponseBody responseBody;
private final ProgressListener progressListener;
private BufferedSource bufferedSource;
ProgressResponseBody(ResponseBody responseBody, ProgressListener progressListener) {
this.responseBody = responseBody;
this.progressListener = progressListener;
}
@Override public MediaType contentType() {
return responseBody.contentType();
}
@Override public long contentLength() {
return responseBody.contentLength();
}
@Override public BufferedSource source() {
if (bufferedSource == null) {
bufferedSource = Okio.buffer(source(responseBody.source()));
}
return bufferedSource;
}
private Source source(Source source) {
return new ForwardingSource(source) {
long totalBytesRead = 0L;
@Override public long read(Buffer sink, long byteCount) throws IOException {
long bytesRead = super.read(sink, byteCount);
// read() returns the number of bytes read, or -1 if this source is exhausted.
totalBytesRead += bytesRead != -1 ? bytesRead : 0;
progressListener.update(totalBytesRead, responseBody.contentLength(), bytesRead == -1);
return bytesRead;
}
};
}
}
interface ProgressListener {
void update(long bytesRead, long contentLength, boolean done);
}
}
但是，当我进行9次以上的并行下载时，UI似乎太迟了。因此，我在侦听器中放置了一个断点，它说它属于主线程。
现在，我想在后台线程中取得进展，并稍后通过DataBinding更新它，那么我不需要在主线程中处理源代码。怎么做？谢谢。