how to use Input stream reader to load files from internal memory android

Question

my app requires that texts be saved(user choice) into the internal memory and then i want something like a favorite feature where user clicks on a button and a favorite activity starts to load the files saved in the memory(internal). in my program there are multiple texts and i have used a random generator to save the files as "fav1" "fav2" etc.. where the integer part is generated randomly. the problem is that now i don't know how to give my file name so that the files are retrieved and shown in a text View.

public void load(String name){


    try {

BufferedReader inputReader = new BufferedReader(new InputStreamReader(openFileInput(filename)));

        String inputString;

        StringBuffer stringBuffer = new StringBuffer();                

        while ((inputString = inputReader.readLine()) != null) {

            stringBuffer.append(inputString + "\n");

        }

        show.setText(stringBuffer.toString());

        } catch (IOException e) {

        e.printStackTrace();

        }

so how do you suggest i retrieve the files, its getting frustrating anyone help.

Answer 1

you can do it easily by the following code; as you said it reads from file from internal storage.

private String readFromFile(String fname) {

    String ret = "";

    try {
        InputStream inputStream = openFileInput(fname+".txt");

        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append(receiveString);
            }

            show.setText(stringBuilder.toString());                

            inputStream.close();

        }
    }

EDIT to read from the path contains path seperators

File myFile = new File(fname+".txt"); // path contains full path to the file including file name
            FileInputStream fIn = new FileInputStream(myFile);
            BufferedReader myReader = new BufferedReader(
                    new InputStreamReader(fIn));
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ((receiveString = myReader.readLine()) != null) {
                stringBuilder.append(receiveString);
            }
            show.setText(stringBuilder.toString());    
            myReader.close();

EDIT 2

to list files from specific directory and to choose the required file by its name.

File directory = new File(Environment.getExternalStorageDirectory()+"/sample");

 // check the existance of the parent directory
 if (directory.exists()) { 

 // get the list of files from the directory and keep it in an array of type File.
                    File[] fileList = directory.listFiles(); 

                for (File file : fileList) {

  //compares with filename: you can change this to your required file!
                        if (file.getName().equals("sam2.txt")) { 

  // method to read and show the text in text view
                            loadFile(file); 



                        }

                    }

finally the definition of loadFile() method:

private void loadFile(File file) {
                // TODO Auto-generated method stub
                   FileInputStream fIn;
                    try {
                        fIn = new FileInputStream(file);
                        BufferedReader myReader = new BufferedReader(
                                new InputStreamReader(fIn));
                        String receiveString = "";
                        StringBuilder stringBuilder = new StringBuilder();

                        while ((receiveString = myReader.readLine()) != null) {
                            stringBuilder.append(receiveString);
                        }
                        show.setText(stringBuilder.toString());    
                        myReader.close();
                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }