Android Retrofit2文件上传进度
在Android开发中,文件上传是一个常见的需求。而使用Retrofit2来实现文件上传的功能也是非常方便的。但是在实际开发中,我们有时候需要展示文件上传的进度,以便让用户知道上传的进度情况。本文将介绍如何使用Retrofit2实现文件上传并展示上传进度。
Retrofit2文件上传
首先,我们需要在build.gradle
文件中添加Retrofit2和OkHttp的依赖:
implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
implementation 'com.squareup.retrofit2:converter-scalars:2.9.0'
implementation 'com.squareup.retrofit2:converter-scalars:2.9.0'
接下来,我们创建一个Retrofit接口,定义文件上传的API:
public interface FileUploadService {
@Multipart
@POST("upload")
Call<ResponseBody> uploadFile(@Part MultipartBody.Part file);
}
然后,在Activity或Fragment中,我们可以使用如下代码来进行文件上传:
File file = new File("path/to/file");
RequestBody requestFile = RequestBody.create(MediaType.parse("multipart/form-data"), file);
MultipartBody.Part body = MultipartBody.Part.createFormData("file", file.getName(), requestFile);
FileUploadService service = retrofit.create(FileUploadService.class);
Call<ResponseBody> call = service.uploadFile(body);
call.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
// 上传成功处理
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
// 上传失败处理
}
});
显示上传进度
为了展示文件上传的进度,我们可以使用OkHttp的拦截器来实现。我们可以定义一个ProgressRequestBody
类,继承自RequestBody
,并在其中实现上传进度的监听:
public class ProgressRequestBody extends RequestBody {
private RequestBody requestBody;
private 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() throws IOException {
return requestBody.contentLength();
}
@Override
public void writeTo(BufferedSink sink) throws IOException {
BufferedSink 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((int) (100 * bytesWritten / contentLength));
}
});
requestBody.writeTo(bufferedSink);
bufferedSink.flush();
}
}
然后,在文件上传的时候,我们使用ProgressRequestBody
替换原有的RequestBody
即可:
File file = new File("path/to/file");
RequestBody requestFile = RequestBody.create(MediaType.parse("multipart/form-data"), file);
ProgressRequestBody progressRequestBody = new ProgressRequestBody(requestFile, progress -> {
// 更新UI,显示上传进度
progressBar.setProgress(progress);
});
MultipartBody.Part body = MultipartBody.Part.createFormData("file", file.getName(), progressRequestBody);
FileUploadService service = retrofit.create(FileUploadService.class);
Call<ResponseBody> call = service.uploadFile(body);
call.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
// 上传成功处理
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
// 上传失败处理
}
});
甘特图
gantt
title 文件上传进度
section 上传文件
上传: 2022-01-01, 5d
section 处理结果
处理成功: 2022-01-06, 5d
关系图
erDiagram
CUSTOMER ||--o{ ORDER : places
ORDER ||--|{ LINE-ITEM : contains
CUSTOMER ||--o{ INVOICE : "liable for"
ORDER ||--|{ INVOICE : "issued on"
通过以上的步骤,我们就可以实现使用Retrofit2上传文件并展示上传进度的功能了。希望