Question

当我运行这些方法时，我的程序将被粉碎

我想将pdf文件长度作为String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));

Answer 2

尝试使用URLConnection.getContentLength()，如下所示。

    URL url = new URL("http://your_url.com/filename.pdf");
    final URLConnection connection = url.openConnection();
    final int length = connection.getContentLength();
    Log.d(tag, String.valueof(length));

你的答案： -

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 = "" + String.valueof(length);
    return size;
}

请记住在清单中给予INTERNET权限： -

<manifest xlmns:android...>
 ...
 <uses-permission android:name="android.permission.INTERNET" />
 <application ...
</manifest>

Android - 如何通过url获取pdf文件大小？

2 个答案: