File Directory Navigation with Android Nanohttpd lightweight server

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With the code below, i was able to create a mobile server on android phone with the Nanohttpd lightweight server. The code basically loop through the root directory of the h

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闹比i

2020-12-20 10:17

You get URI in first parameter. So appending that to path with open specified directory. If you request 192.168.1.6:8080/ABC program will look for ABC folder in External directory.

Then when check whether taken item is a file or directory & according to which we change our output. using

.isFile()

Below is code which should work :

 ....
 public Response serve(String uri, Method method,
                Map<String, String> header, Map<String, String> parameters,
                Map<String, String> files) {

            File rootDir = new File( Environment.getExternalStorageDirectory() +  File.separator  + uri);
            File[] files2 = rootDir.listFiles();
            String answer = "<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>sdcard0 - TECNO P5 - WiFi File Transfer Pro</title>";
            for (File detailsOfFiles : files2) {
                if(detailsOfFiles.isFile()){
                        answer += detailsOfFiles.getAbsolutePath() + "<br>";
                }else{
                answer += "<a href=\"" + detailsOfFiles.getAbsolutePath()
                        + "\" alt = \"\">" + detailsOfFiles.getAbsolutePath()
                        + "</a><br>";
                        }
            }
            answer += "</head></html>";
            return new NanoHTTPD.Response(answer);
 }
...

Sorry for bad explanation.

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夕颜

2020-12-20 10:24

i finally figure out how to do this after enough time of studying the NanoHTTPD Framework.The code below helps me to navigate within the directories in the host android device:

@Override
        public Response serve(String uri, Method method,
                Map<String, String> header, Map<String, String> parameters,
                Map<String, String> files) {
            File rootDir = Environment.getExternalStorageDirectory();
            File[] filesList = null;
            String filepath = "";
            if (uri.trim().isEmpty()) {
                filesList = rootDir.listFiles();
            } else {
                filepath = uri.trim();
            }
            filesList = new File(filepath).listFiles();
            String answer = "<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>sdcard0 - TECNO P5 - WiFi File Transfer Pro</title>";
            if (new File(filepath).isDirectory()) {
                for (File detailsOfFiles : filesList) {
                    answer += "<a href=\"" + detailsOfFiles.getAbsolutePath()
                            + "\" alt = \"\">"
                            + detailsOfFiles.getAbsolutePath() + "</a><br>";
                }
            } else {
            }
            answer += "</head></html>" + "uri: " + uri + " \nfiles " + files
                    + " \nparameters " + parameters + " \nheader ";
            return new NanoHTTPD.Response(answer);
        }

the uri parameter in the Response Method contains browser url at that point in time: Example if url displaying on the address bar is: /192.168.43.1:8080/storage/sdcard1/Smadav_2012_Rev._9.0, then uri contains /storage/sdcard1/Smadav_2012_Rev._9.0. What i did is to just pass the uri as a filepath and of course, this is not the case for first connection when the uri is empty.

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