android改造下载进度

概述我是新来的改造.我搜索过但没有找到简单的答案.我想知道如何在通知栏中显示下载进度或至少显示进度对话框,该对话框指定进程的百分比和下载文件的大小.这是我的代码：publicinterfaceServerAPI{@GETCall<ResponseBody>downlload(@UrlStringfileUrl);Retrofi

我是新来的改造.我搜索过但没有找到简单的答案.我想知道如何在通知栏中显示下载进度或至少显示进度对话框,该对话框指定进程的百分比和下载文件的大小.
这是我的代码：

public interface ServerAPI {    @GET    Call<ResponseBody> downlload(@Url String fileUrl);    Retrofit retrofit =            new Retrofit.Builder()                    .baseUrl("http://192.168.43.135/retro/")                     .addConverterFactory(GsonConverterFactory.create())                    .build();}public voID download(){    ServerAPI API = ServerAPI.retrofit.create(ServerAPI.class);    API.downlload("https://www.Google.com/images/branding/Googlelogo/2x/Googlelogo_color_120x44dp.png").enqueue(new Callback<ResponseBody>() {        @OverrIDe        public voID onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {            try {                file path = Environment.getExternalStorageDirectory();                file file = new file(path, "file_name.jpg");                fileOutputStream fileOutputStream = new fileOutputStream(file);                IoUtils.write(response.body().bytes(), fileOutputStream);            }            catch (Exception ex){            }        }        @OverrIDe        public voID onFailure(Call<ResponseBody> call, Throwable t) {        }    });}

如果可以,请指导我.
谢谢

解决方法:

您需要创建一个特定的Okhttp客户端,它将拦截网络请求并发送更新.此客户端应仅用于下载.

首先,您将需要一个接口,如下所示：

public interface OnAttachmentDownloadListener {    voID onAttachmentDownloadedSuccess();    voID onAttachmentDownloadedError();    voID onAttachmentDownloadedFinished();    voID onAttachmentDownloadUpdate(int percent);}

您的下载调用应该返回一个ResponseBody,我们将从中扩展以获得下载进度.

private static class ProgressResponseBody extends ResponseBody {    private final ResponseBody responseBody;    private final OnAttachmentDownloadListener progressListener;    private BufferedSource bufferedSource;    public ProgressResponseBody(ResponseBody responseBody, OnAttachmentDownloadListener 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);                totalBytesRead += bytesRead != -1 ? bytesRead : 0;                float percent = bytesRead == -1 ? 100f : (((float)totalBytesRead / (float) responseBody.contentLength()) * 100);                if(progressListener != null)                    progressListener.onAttachmentDownloadUpdate((int)percent);                return bytesRead;            }        };    }}

然后你需要像这样创建你的OkhttpClIEnt

public OkhttpClIEnt.Builder getokhttpDownloadClIEntBuilder(OnAttachmentDownloadListener progressListener) {    OkhttpClIEnt.Builder httpClIEntBuilder = new OkhttpClIEnt.Builder();    // You might want to increase the timeout    httpClIEntBuilder.connectTimeout(20, TimeUnit.SECONDS);    httpClIEntBuilder.writeTimeout(0, TimeUnit.SECONDS);    httpClIEntBuilder.readTimeout(5, TimeUnit.MINUTES);    httpClIEntBuilder.addInterceptor(new Interceptor() {        @OverrIDe        public Response intercept(Chain chain) throws IOException {            if(progressListener == null) return chain.proceed(chain.request());        Response originalResponse = chain.proceed(chain.request());        return originalResponse.newBuilder()                .body(new ProgressResponseBody(originalResponse.body(), progressListener))                .build();        }    });    return httpClIEntBuilder;}

最后,您只需通过传递新的Okhttp客户端,以不同的方式创建您的Retrofit客户端.根据您的代码,您可以使用以下内容：

 public Retrofit getDownloadRetrofit(OnAttachmentDownloadListener Listener) {    return new Retrofit.Builder()                .baseUrl("http://192.168.43.135/retro/")                 .addConverterFactory(GsonConverterFactory.create())                .clIEnt(getokhttpDownloadClIEntBuilder(Listener).build())                .build();}

您的听众将处理您的通知的创建或您想要的任何其他内容.

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