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How to make a txt file and read txt file from internal storage in android?

This example demonstrates How to make a txt file and read txt file from internal storage in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
   xmlns:tools = "http://schemas.android.com/tools"
   android:layout_width = "match_parent"
   android:layout_height = "match_parent"
   tools:context = ".MainActivity"
   android:orientation = "vertical">
      android:id = "@+id/enterText"
      android:hint = "Please enter text here"
      android:layout_width = "match_parent"
      android:layout_height = "wrap_content" />
      android:id = "@+id/save"
      android:text = "Save"
      android:layout_width = "wrap_content"
      android:layout_height = "wrap_content" />
      android:id = "@+id/output"
      android:layout_width = "wrap_content"
      android:textSize = "25sp"
      android:layout_height = "wrap_content" />

In the above code, we have taken editext and button. When user click on button, it will take data from edittext and store in internal storage as /data/data/<your.package.name>/files/text/sample.txt. It going to append the data to textview from sample.txt

Step 3 − Add the following code to src/MainActivity.java

package com.example.andy.myapplication;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

public class MainActivity extends AppCompatActivity {
   Button save;
   protected void onCreate(Bundle savedInstanceState) {
      final TextView output = findViewById(R.id.output);
      final EditText enterText = findViewById(R.id.enterText);
      save = findViewById(R.id.save);
      save.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
            if (!enterText.getText().toString().isEmpty()) {
               File file = new File(MainActivity.this.getFilesDir(), "text");
               if (!file.exists()) {
               try {
                  File gpxfile = new File(file, "sample");
                  FileWriter writer = new FileWriter(gpxfile);
                  Toast.makeText(MainActivity.this, "Saved your text", Toast.LENGTH_LONG).show();
               } catch (Exception e) { }
   private String readFile() {
      File fileEvents = new File(MainActivity.this.getFilesDir()+"/text/sample");
      StringBuilder text = new StringBuilder();
      try {
         BufferedReader br = new BufferedReader(new FileReader(fileEvents));
         String line;
         while ((line = br.readLine()) ! = null) {
');          }          br.close();       } catch (IOException e) { }       String result = text.toString();       return result;    } }

Step 4 − Add the following code to manifest.xml

<?xml version = "1.0" encoding = "utf-8"?>
<manifest xmlns:android = "http://schemas.android.com/apk/res/android"
   package = "com.example.andy.myapplication">
   <uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE"/>
   <uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE"/>
      android:allowBackup = "true"
      android:icon = "@mipmap/ic_launcher"
      android:label = "@string/app_name"
      android:roundIcon = "@mipmap/ic_launcher_round"
      android:supportsRtl = "true"
      android:theme = "@style/AppTheme">
     <activity android:name = ".MainActivity">
           <action android:name = "android.intent.action.MAIN" />
           <category android:name = "android.intent.category.LAUNCHER" />

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

In the above result, we have added some text and clicked on save button as shown below –

To verify the above result, /data/data/<your.package.name>/files/text/sample.txt as shown below –

Click here to download the project code