java - Android - 如何通过 url 获取 pdf 文件大小？

Question

当我运行这些方法时我的程序会崩溃

我想获取 pdf 文件的长度作为字符串并在 TextView 上设置此文本

private String getSize(String url1){
    URL url = null;
    try {  
       url = new URL(url1);
    } catch (MalformedURLException e) {
       e.printStackTrace();
    }
       URLConnection connection = null;
    try {
       connection = url.openConnection();
    } catch (IOException e) {
       e.printStackTrace();
    }
    final int length = connection.getContentLength();
    String size = "" + length;
    return size;
}

Answer 1

使用以下代码获取文件大小:

URL url = new URL("http://testserver.com/file.pdf");
URLConnection urlConnection = url.openConnection();
urlConnection.connect();
int fileSize = urlConnection.getContentLength();

textView.setText(String.valueOf(fileSize));