OkHttp3和Retrofit2是Android开发中常用的网络请求库,可以用于实现分块多文件上传功能。要获取分块多文件上传的进度,可以通过自定义RequestBody和Interceptor来实现。
首先,我们需要自定义一个ProgressRequestBody类,继承自RequestBody,并重写其中的方法。在该类中,我们可以通过实现okhttp3.RequestBody的writeTo(BufferedSink sink)方法来监听上传进度,并通过回调方式将进度信息传递给外部。
public class ProgressRequestBody extends RequestBody {
private static final int DEFAULT_BUFFER_SIZE = 2048;
private File file;
private String contentType;
private UploadCallbacks callbacks;
public interface UploadCallbacks {
void onProgressUpdate(int percentage);
}
public ProgressRequestBody(File file, String contentType, UploadCallbacks callbacks) {
this.file = file;
this.contentType = contentType;
this.callbacks = callbacks;
}
@Override
public MediaType contentType() {
return MediaType.parse(contentType);
}
@Override
public long contentLength() {
return file.length();
}
@Override
public void writeTo(BufferedSink sink) throws IOException {
try (Source source = Okio.source(file)) {
Buffer buffer = new Buffer();
long uploaded = 0;
long fileSize = file.length();
for (long readCount; (readCount = source.read(buffer, DEFAULT_BUFFER_SIZE)) != -1; ) {
sink.write(buffer, readCount);
uploaded += readCount;
int progress = (int) ((uploaded * 100) / fileSize);
callbacks.onProgressUpdate(progress);
}
}
}
}
接下来,我们可以使用Retrofit2来进行分块多文件上传。在Retrofit的接口定义中,我们需要使用@Multipart注解来标记上传文件的请求,并使用@Part注解来指定文件的参数名。
public interface FileUploadService {
@Multipart
@POST("upload")
Call<ResponseBody> uploadFile(@Part("file") ProgressRequestBody file);
}
然后,我们可以创建一个OkHttpClient,并添加一个Interceptor来监听上传进度。在Interceptor中,我们可以通过RequestBody的contentLength()方法获取文件的总大小,并在写入请求体时更新上传进度。
OkHttpClient client = new OkHttpClient.Builder()
.addInterceptor(new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Request originalRequest = chain.request();
Request.Builder requestBuilder = originalRequest.newBuilder();
if (originalRequest.body() instanceof ProgressRequestBody) {
ProgressRequestBody progressRequestBody = (ProgressRequestBody) originalRequest.body();
progressRequestBody.setUploadCallbacks(new ProgressRequestBody.UploadCallbacks() {
@Override
public void onProgressUpdate(int percentage) {
// 更新上传进度
Log.d("Upload Progress", percentage + "%");
}
});
requestBuilder.method(originalRequest.method(), progressRequestBody);
}
Request request = requestBuilder.build();
return chain.proceed(request);
}
})
.build();
最后,我们可以使用Retrofit来创建文件上传的请求,并将自定义的ProgressRequestBody作为参数传入。
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://example.com/")
.client(client)
.build();
File file = new File("path/to/file");
ProgressRequestBody requestBody = new ProgressRequestBody(file, "image/jpeg", new ProgressRequestBody.UploadCallbacks() {
@Override
public void onProgressUpdate(int percentage) {
// 更新上传进度
Log.d("Upload Progress", percentage + "%");
}
});
FileUploadService service = retrofit.create(FileUploadService.class);
Call<ResponseBody> call = service.uploadFile(requestBody);
call.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
// 处理上传成功的响应
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
// 处理上传失败的情况
}
});
通过以上步骤,我们就可以使用OkHttp3和Retrofit2来实现分块多文件上传,并获取上传进度。在自定义的ProgressRequestBody中,我们可以根据需要进行进一步的处理,例如将进度信息传递给UI界面进行展示。
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