New to Java. Problems reading from file using Context and openFileInput

Question

I've been trying to do this on my own for the past couple hours and am kinda losing it a little.

All I want to do is open a file, read it and display it to the console; that's it.

I'm using eclipse to develop for android 2.3.3.

I have tried using a bunch of different ways with code that I have found here, and on other sites. Here is what I have now and how its all called:

In the OnCreate function:

setContentView(new TestMap(this));

The testMap class:

TestMap(Context context){
        super(context);
        // might need to be on the panel class
        loadTileFile("worldonelayout.txt", context);

in the same class:

private void loadTileFile (String filename, Context context){
        FileInputStream input = null;
        InputStreamReader reader = null;

        char[] inputBuffer = new char[256];
        String data = null;

        try {
            input = context.openFileInput("worldonelayout.txt");
            reader = new InputStreamReader(input);
            reader.read(inputBuffer);
            data = new String(inputBuffer);
            System.out.println(data);
            Toast.makeText(context, "Text read", Toast.LENGTH_SHORT).show();

        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(context, "Text not read", Toast.LENGTH_SHORT).show();

        } finally {
            try {
                input.close();
                reader.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

This code doesnt work. It always hits the exception.

"/data/data/com.name.somethingiremoved/files/worldonelayout.txt (No such file or directory)".

This happens at the first CATCH. BTW my file is in the root directory: Documents\Eclipse\workspace\project\worldonelayout.txt. I can also see the file in the browser on the left

From what I have seen here and on other sites, it is something to do with the Context class being derived from the Activity? I don't want to have this code in the same class as my activity. Is there a way round this?

If you need anything more from me, let me know.

@OllieC /data/data/com.name.somethingiremoved/files/worldonelayout.txt (No such file or directory). The first CATCH. BTW my file is ine the root directory: Documents\Eclipse\workspace\project\worldonelayout.txt. I can also see the file in the browser on the left — maffo, Apr 05 '12 at 18:45
Can you use system.out.println in android? It's also a good idea to show your logcat errors — Stagleton, Apr 05 '12 at 18:52

score 1 · Answer 1 · answered Apr 05 '12 at 18:49

1

The open file is looking for a file on the phone's file system, not on the computer's. Its telling you exactly where it expects to find it - on the phone under /data/data/com.name.somethingiremoved/files/worldonelayout.txt

answered Apr 05 '12 at 18:49

HannahMitt

1,010
11
14

This does make sence. Do you know how I go about adding this file to the phone. – maffo Apr 05 '12 at 19:07
mount an actual phone or for the emulator http://stackoverflow.com/questions/2808632/manually-put-files-to-android-emulator-sd-card – HannahMitt Apr 06 '12 at 18:39

New to Java. Problems reading from file using Context and openFileInput

1 Answers1