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I'm currently working on an android app to help my fellow classmates to learn C language. I'm pretty much done with the design and layout of the app, and have even managed to put explanation with example. But I really don't know how to display the C programs inside the app.

I've read about displaying HTML code and reading/displaying from a text file in raw folder but I don't think that'd prove helpful here. Plus I'm new to Java/Android Studio stuff so I request you all to post a bit detailed answer with little explanation.

I don't necessarily want the C code to be color highlighted or prettified, it would be enough if I could just somehow display it.

halfer
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d02d33pak
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  • http://stackoverflow.com/questions/31837840/paginating-text-in-android/32096884#32096884 – Onik Mar 08 '17 at 00:34

1 Answers1

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An easy way to achieve this would be with storing the code in a file ( http://developer.android.com/training/basics/data-storage/files.html ) and reading from there every time the user opens the activity where the code can be seen.

Remember :

  1. The permissions :

    <manifest ...>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
</manifest>

  2. I recommend saving the files in the internal storage. This way, when the user uninstalls the app, the files are deleted. You can do something like this to read : 

    File dir = getFilesDir();
File file = new File(dir, "File.txt");

try {
    //Attaching BufferedReader to the FileInputStream by the help of InputStreamReader
    BufferedReader bufferedReader = new BufferedReader(new FileReader(new
            File(getFilesDir()+File.separator+"File.txt")));
    String inputString;

    s = "";
    //Reading data line by line and storing it into the stringbuffer
    while ((inputString = bufferedReader.readLine()) != null) {

        s+=inputString + "\n";

    }

    bufferedReader.close();

} catch (IOException e) {
    e.printStackTrace();
}

And this to write : 

    try {
            FileOutputStream fos = openFileOutput("File.txt", Context.MODE_APPEND);

            for (int l = 0;l<=10;l++) {
                fos.write("something".getBytes());
                fos.write("\n".getBytes());
            }

            fos.close();

            //display file saved message

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

See more details in the link provided. Happy coding!

Stefan Ionescu
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  • Well I somehow managed to do what was suggested (your answer didn't work though, I had to look for another way to achieve the same), but now I want to turn that piece of code into **a function/method** so that I can call it from different activities and achieve a text view that displays the content of a particular file. Now I know the id and file are going to change for every text view so I think I need to pass those as arguments to the function/method , right? So will someone please help me achieve that (if it's attainable). – d02d33pak Mar 22 '16 at 15:19