Question

我从网上下载文件的代码。它适用于带有SD卡的手机，但我已经在没有SD卡的手机上进行了测试，我收到了以下错误：

java.io.FileNotFoundException /storage/emulated/0/Movies/65656s5d.mp4 open failed :ENONET (no such file or directory)

这是doInBackGround中的代码：

InputStream input = null;
OutputStream output = null;
HttpURLConnection connection = null;
try {
    URL url = new URL(sUrl[0]);
    connection = (HttpURLConnection) url.openConnection();
    connection.connect();

    // expect HTTP 200 OK, so we don't mistakenly save error report
    // instead of the file
    if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
        return "Server returned HTTP " + connection.getResponseCode() + " "
                + connection.getResponseMessage();
    }

    // this will be useful to display download percentage
    // might be -1: server did not report the length
    int fileLength = connection.getContentLength();

    // download the file
    input = connection.getInputStream();

    long number = (long) Math.floor(Math.random() * 9000000000L) + 1000000000L;
    String destPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES)
            + File.separator+number + ".mp4";
    output = new FileOutputStream(destPath);

    byte data[] = new byte[4096];
    long total = 0;
    int count;
    while ((count = input.read(data)) != -1) {
        // allow canceling with back button
        if (isCancelled()) {
            input.close();
            return null;
        }
        total += count;
        // publishing the progress....
        if (fileLength > 0) // only if total length is known
            publishProgress((int) (total * 100 / fileLength));
        output.write(data, 0, count);
    }
    return "ok";
} catch (Exception e) {
    Log.v("this",e.getMessage());
    return e.toString();
} finally {
    try {
        if (output != null)
            output.close();
        if (input != null)
            input.close();
    } catch (IOException ignored) {
        Log.v("this",ignored.getMessage());
        return ignored.toString();
    }

    if (connection != null)
        connection.disconnect();
}

我该如何解决这个问题？

Answer 1

您可能想要使用getExternalStorageDirectory。查看文档以获取详细信息：https://developer.android.com/reference/android/os/Environment.html

Answer 2

Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES)即使设备没有SD卡也无效，它始终存在。请检查您的文件，是否存在（使用File类中的exists方法）？

使用getExternalStoragePublicDirectory时出现FileNotFoundException

2 个答案: