saving file in internal storage android

I'm not too sure which example you are referring to but I have two working samples here of which at least one of them should suit your needs.I tested these on an X10 running Build number 2.1.A.0.435, one Xperia T running Build number 7.0.A.1.303 and one Nexus S running Build number JZO54K

Example 1

    String filename = "myfile";    String outputString = "Hello world!";    try {        FileOutputStream outputStream = openFileOutput(filename, Context.MODE_PRIVATE);        outputStream.write(outputString.getBytes());        outputStream.close();    } catch (Exception e) {        e.printStackTrace();    }    try {        FileInputStream inputStream = openFileInput(filename);        BufferedReader r = new BufferedReader(new InputStreamReader(inputStream));        StringBuilder total = new StringBuilder();        String line;        while ((line = r.readLine()) != null) {            total.append(line);        }        r.close();        inputStream.close();        Log.d("File", "File contents: " + total);    } catch (Exception e) {        e.printStackTrace();    }

Example 2

    String filename = "mysecondfile";    String outputString = "Hello world!";    File myDir = getFilesDir();    try {        File secondFile = new File(myDir + "/text/", filename);        if (secondFile.getParentFile().mkdirs()) {            secondFile.createNewFile();            FileOutputStream fos = new FileOutputStream(secondFile);            fos.write(outputString.getBytes());            fos.flush();            fos.close();        }    } catch (Exception e) {        e.printStackTrace();    }    try {        File secondInputFile = new File(myDir + "/text/", filename);        InputStream secondInputStream = new BufferedInputStream(new FileInputStream(secondInputFile));        BufferedReader r = new BufferedReader(new InputStreamReader(secondInputStream));        StringBuilder total = new StringBuilder();        String line;        while ((line = r.readLine()) != null) {            total.append(line);        }        r.close();        secondInputStream.close();        Log.d("File", "File contents: " + total);    } catch (Exception e) {        e.printStackTrace();    }

I had "Permission denied" issue with Samsung Galaxy S7 even though I had given read and write permissions in manifest file. I solved it by going to phone settings >> application >> [my app] and allowed "Storage" under permission. Worked fine after that.