在Android中实现分块上传并显示进度的解决方法如下:
首先,确保你已经添加了对OkHttp和Retrofit库的依赖。
public interface FileUploadService {
@Multipart
@POST("upload")
Call uploadFile(
@Part("description") RequestBody description,
@Part MultipartBody.Part file
);
}
private void uploadFile(File file) {
// 创建RequestBody对象
RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
// 创建MultipartBody.Part对象,用于封装文件数据
MultipartBody.Part filePart = MultipartBody.Part.createFormData("file", file.getName(), requestBody);
// 创建RequestBody对象,封装描述字符串
RequestBody descPart = RequestBody.create(MediaType.parse("multipart/form-data"), "File description");
// 创建retrofit实例
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.client(new OkHttpClient.Builder().build())
.addConverterFactory(GsonConverterFactory.create())
.build();
// 创建API接口实例
FileUploadService service = retrofit.create(FileUploadService.class);
// 创建Call对象,传入接口方法和参数
Call call = service.uploadFile(descPart, filePart);
// 执行异步上传操作
call.enqueue(new Callback() {
@Override
public void onResponse(Call call, Response response) {
// 上传成功处理逻辑
}
@Override
public void onFailure(Call call, Throwable t) {
// 上传失败处理逻辑
}
});
}
public class ProgressRequestBody extends RequestBody {
private final RequestBody requestBody;
private final ProgressListener listener;
public ProgressRequestBody(RequestBody requestBody, ProgressListener listener) {
this.requestBody = requestBody;
this.listener = listener;
}
@Nullable
@Override
public MediaType contentType() {
return requestBody.contentType();
}
@Override
public long contentLength() {
try {
return requestBody.contentLength();
} catch (IOException e) {
return -1;
}
}
@Override
public void writeTo(BufferedSink sink) throws IOException {
BufferedSink bufferedSink;
if (sink instanceof Buffer) {
bufferedSink = Okio.buffer(sink);
} else {
bufferedSink = Okio.buffer(new ForwardingSink(sink) {
long bytesWritten = 0L;
long contentLength = 0L;
@Override
public void write(Buffer source, long byteCount) throws IOException {
super.write(source, byteCount);
if (contentLength == 0) {
contentLength = contentLength();
}
bytesWritten += byteCount;
listener.onProgress(bytesWritten, contentLength);
}
});
}
requestBody.writeTo(bufferedSink);
bufferedSink.flush();
}
public interface ProgressListener {
void onProgress(long bytesWritten, long contentLength);
}
}
private void uploadFile(File file) {
// 创建RequestBody对象
RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
// 创建ProgressRequestBody对象,用于监听上传进度
ProgressRequestBody progressRequestBody = new ProgressRequestBody(requestBody, new ProgressRequestBody.ProgressListener() {
@Override
public void onProgress(long bytesWritten, long contentLength) {
// 更新上传进度
int progress = (int) (100 * bytesWritten / contentLength);
// 更新UI进度条
updateProgressBar(progress);
}
});
// 创建MultipartBody.Part对象,用于封装文件数据
MultipartBody.Part filePart = MultipartBody.Part.createFormData("file", file.getName(), progressRequestBody);
// ...其它代码不变...
}
private void updateProgressBar(int progress) {
// 更新UI进度条
progressBar.setProgress(progress);
}
以上是一个使用OkHttp和Retrofit库实现Android分块上传并显示