okhttp 下载更新进度条
时间: 2023-12-22 11:00:42 浏览: 168
使用OkHttp进行下载更新时,可以通过使用OkHttp的Interceptor来监控下载进度并更新进度条。首先,我们需要创建一个自定义的拦截器来实现这个功能。在拦截器中,我们需要获取响应体的字节流,并根据下载的进度更新进度条。
接着,我们需要将自定义的拦截器添加到OkHttp的拦截器链中,在发起下载请求时,拦截器就会自动执行并更新进度条。同时,我们还可以通过回调函数来实时获取下载进度并更新UI界面。
在更新进度条时,我们需要将下载的字节总数和已下载的字节数进行对比,然后计算出已下载的百分比,并将这个百分比值传递给进度条进行更新。
另外,为了避免在UI线程中更新进度条而导致界面卡顿,我们可以将更新进度条的操作放在子线程中执行,从而保证界面的流畅性。
总之,通过使用OkHttp的拦截器和回调函数,我们可以很方便地实现下载更新进度条的功能,为用户提供更好的下载体验。
相关问题
OkHttp实现带进度条上传文件
在 OkHttp 中实现带进度条上传文件,可以使用 RequestBody 的子类 ProgressRequestBody 来实现,具体代码如下:
```
public class ProgressRequestBody extends RequestBody {
private RequestBody requestBody;
private UploadProgressListener progressListener;
public ProgressRequestBody(RequestBody requestBody, UploadProgressListener progressListener) {
this.requestBody = requestBody;
this.progressListener = progressListener;
}
@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;
if (sink instanceof Buffer) {
bufferedSink = sink;
} else {
bufferedSink = Okio.buffer(sink);
}
CountingSink countingSink = new CountingSink(bufferedSink);
BufferedSink progressSink = Okio.buffer(countingSink);
requestBody.writeTo(progressSink);
progressSink.flush();
progressListener.onProgress(countingSink.getContentLength());
}
private class CountingSink extends ForwardingSink {
private long contentLength;
private long bytesWritten;
public CountingSink(Sink delegate) {
super(delegate);
contentLength = -1;
bytesWritten = 0;
}
@Override
public void write(Buffer source, long byteCount) throws IOException {
super.write(source, byteCount);
if (contentLength == -1) {
contentLength = contentLength();
}
bytesWritten += byteCount;
}
public long getContentLength() {
return contentLength;
}
public long getBytesWritten() {
return bytesWritten;
}
}
}
```
其中,UploadProgressListener 为上传进度监听器,代码如下:
```
public interface UploadProgressListener {
void onProgress(long bytesWritten);
}
```
在上传文件的时候,将 ProgressRequestBody 作为 RequestBody 使用即可:
```
OkHttpClient client = new OkHttpClient();
File file = new File("path/to/file");
RequestBody requestBody = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart("file", file.getName(), new ProgressRequestBody(RequestBody.create(MediaType.parse("application/octet-stream"), file), new UploadProgressListener() {
@Override
public void onProgress(long bytesWritten) {
// 更新上传进度
}
}))
.build();
Request request = new Request.Builder()
.url("http://localhost/upload")
.post(requestBody)
.build();
Response response = client.newCall(request).execute();
```
在 ProgressRequestBody 中,每次写入数据的时候,都会回调 onProgress 方法,可以在这里更新上传进度。
okhttp3实现下载进度条
以下是使用OkHttp3实现下载进度条的示例:
1. 引入依赖
在项目的build.gradle文件中添加OkHttp3依赖:
```groovy
dependencies {
implementation 'com.squareup.okhttp3:okhttp:4.9.1'
}
```
2. 创建OkHttpClient
```java
OkHttpClient client = new OkHttpClient();
```
3. 创建Request
```java
Request request = new Request.Builder()
.url("http://www.example.com/file.txt")
.build();
```
4. 执行请求
```java
Call call = client.newCall(request);
Response response = call.execute();
```
5. 获取响应体并写入文件
```java
if (response.isSuccessful()) {
InputStream inputStream = response.body().byteStream();
FileOutputStream outputStream = new FileOutputStream("file.txt");
byte[] buffer = new byte[1024];
int len;
while ((len = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, len);
}
outputStream.flush();
outputStream.close();
inputStream.close();
}
```
6. 获取下载进度并更新UI
```java
if (response.isSuccessful()) {
InputStream inputStream = response.body().byteStream();
FileOutputStream outputStream = new FileOutputStream("file.txt");
byte[] buffer = new byte[1024];
int len;
long total = response.body().contentLength();
long sum = 0;
while ((len = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, len);
sum += len;
int progress = (int) (sum * 1.0f / total * 100);
// 更新UI
updateProgress(progress);
}
outputStream.flush();
outputStream.close();
inputStream.close();
}
```
其中,updateProgress方法用于更新下载进度的UI。
阅读全文
相关推荐











