在Android/Java中,要跟踪InputStream的进度,可以通过以下步骤实现:
下面是一个示例代码:
import java.io.IOException;
import java.io.InputStream;
public class ProgressInputStream extends InputStream {
private InputStream inputStream;
private long progress;
public ProgressInputStream(InputStream inputStream) {
this.inputStream = inputStream;
this.progress = 0;
}
@Override
public int read() throws IOException {
int data = inputStream.read();
if (data != -1) {
progress++;
}
return data;
}
@Override
public int read(byte[] b) throws IOException {
int bytesRead = inputStream.read(b);
if (bytesRead != -1) {
progress += bytesRead;
}
return bytesRead;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int bytesRead = inputStream.read(b, off, len);
if (bytesRead != -1) {
progress += bytesRead;
}
return bytesRead;
}
public long getProgress() {
return progress;
}
// 其他重写的InputStream方法...
// 示例使用腾讯云对象存储 COS(Cloud Object Storage)作为相关产品
// 腾讯云COS产品介绍链接:https://cloud.tencent.com/product/cos
}
使用示例:
try {
InputStream inputStream = new ProgressInputStream(new FileInputStream("file.txt"));
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
// 处理读取的数据
// 可以通过调用getProgress()方法获取当前读取的进度
}
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
这样,通过使用自定义的ProgressInputStream类,我们可以在读取InputStream的过程中实时跟踪进度。
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