Android - saving a text file from edittext - file not found

Question

I need a simple app making a text file (.txt) in the phone (root) with inside various strings from various edittexts. A button confirms the input data.

An example of output in the file must be:

FileName.txt

John ; Smith ; 10/05/1970 ; 

The problem is this: there is no error in the emulator, but when I open the apk file in the real phone and the app confirms that the file was saved in the directory /data/user/0/com.example.utente.questionario/files when I search this file FileName.txt in the phone (I use Android 7) I didn't find any file and I find only the empty folder /data/. What is the problem?

This is the code:

MainActivity.java

package com.example.utente.questionario;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.io.OutputStreamWriter;
import java.io.FileOutputStream;


public class MainActivity extends AppCompatActivity {

private String getOrderText(String aa, String bb, String cc){

    StringBuilder sb = new StringBuilder();
    sb.append(aa+ ";");
    sb.append(" " + bb+ ";");
    sb.append(" " + cc);

    return sb.toString();
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final EditText editText1 = (EditText) findViewById(R.id.editText1);
    final EditText editText2 = (EditText) findViewById(R.id.editText2);
    final EditText editText3 = (EditText) findViewById(R.id.editText3);
    final Button button1 = (Button) findViewById(R.id.button1);


    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            String name = editText1.getText().toString();
            String surname = editText2.getText().toString();
            String birthDate = editText3.getText().toString();

            try {
                FileOutputStream fileOut=openFileOutput("FileName.txt", MODE_APPEND); 
                    OutputStreamWriter outputWriter=new OutputStreamWriter(fileOut);
                outputWriter.write(getOrderText(name, surname, birthDate));
                outputWriter.write("\n");
                outputWriter.close();

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


            Toast.makeText(MainActivity.this,
                    String.valueOf("The file was saved in " + MainActivity.this.getFilesDir().getAbsolutePath()), Toast.LENGTH_SHORT ).show();
            }
          });

}


}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.utente.questionario.MainActivity">

<EditText
    android:id="@+id/editText1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ems="10"
    android:inputType="textPersonName"
    android:hint="Nome"
    android:layout_marginTop="74dp"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true" />

<EditText
    android:id="@+id/editText2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ems="10"
    android:inputType="textPersonName"
    android:hint="Cognome"
    android:layout_below="@+id/editText1"
    android:layout_alignStart="@+id/editText1"
    android:layout_marginTop="42dp" />

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Data di nascita"
    android:textSize="18dp"
    android:layout_marginBottom="67dp"
    android:layout_above="@+id/button1"
    android:layout_centerHorizontal="true" />

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Genera file"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="90dp" />

<EditText
    android:id="@+id/editText3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ems="10"
    android:inputType="date"
    android:hint="gg/mm/aaaa"
    android:layout_centerVertical="true"
    android:layout_alignStart="@+id/editText2" />

</RelativeLayout>

Answer 1

It seems that your phone is not rooted. File is properly saving in that directory but you can't find it because normal user can't see /data/... directory.