Read write file android

layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <EditText
        android:id="@+id/myEditText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="New To Do Item"
    />
    <ListView
        android:id="@+id/myListView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
    />
</LinearLayout>

for internal file



 protected void readFile()
    {
        try {
            String file = "input.txt";

            FileInputStream finp = openFileInput(file);
            InputStreamReader isr = new InputStreamReader(finp, "UTF8");
            BufferedReader br = new BufferedReader(isr);
            String line ="";
            while((line = br.readLine()) != null){
                myEditText.setText(line);
            }
            br.close();
            isr.close();
        } catch (Exception e) {
            myEditText.setText(e.toString());
            // TODO: handle exception
        }
    }



protected void writeFile()
    {
        try {
            String file = "input.txt";

            FileInputStream finp = openFileInput(file);
            InputStreamReader isr = new InputStreamReader(finp, "UTF8");
            BufferedReader br = new BufferedReader(isr);
            String line ="";
            int total = 0;
            while((line = br.readLine()) != null){
                //myEditText.setText(line);
                try {
                    total += Integer.parseInt(line);
                } catch(NumberFormatException nfe) {
                   System.out.println("Could not parse " + nfe);
                }
            }
            br.close();
            isr.close();
           
           
            file = "output.txt";

            FileOutputStream fout = openFileOutput(file, MODE_WORLD_WRITEABLE);
            OutputStreamWriter osw = new OutputStreamWriter(fout, "UTF8");
            BufferedWriter bw = new BufferedWriter(osw);

            bw.write(Integer.toString(total));
            //bw.write("helo");

            bw.close();
            osw.close();
           
           
        } catch (Exception e) {
            myEditText.setText(e.toString());
            // TODO: handle exception
        }
    }