Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to store list in a txt file and read list from txt file in android?
This example demonstrates How to store list in a txt file and read list from txt file 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">
<EditText
android:id = "@+id/enterText"
android:hint = "Please enter text here"
android:layout_width = "match_parent"
android:layout_height = "wrap_content" />
<Button
android:id = "@+id/save"
android:text = "Save"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content" />
<TextView
android:id = "@+id/output"
android:layout_width = "wrap_content"
android:textSize = "25sp"
android:layout_height = "wrap_content" />
</LinearLayout>In the above code, we have taken editext and button. When the user clicks on the button, it will take data from edit text and store in internal storage as /data/data/<your.package.name>/files/text/sample.txt. It going to append the list 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.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.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
public class MainActivity extends AppCompatActivity {
Button save;
ArrayList<String> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = new ArrayList<>();
final TextView output = findViewById(R.id.output);
final EditText enterText = findViewById(R.id.enterText);
save = findViewById(R.id.save);
save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!enterText.getText().toString().isEmpty()) {
File file = new File(MainActivity.this.getFilesDir(), "text");
if (!file.exists()) {
file.mkdir();
}
try {
File gpxfile = new File(file, "sample");
FileWriter writer = new FileWriter(gpxfile);
writer.append(enterText.getText().toString());
writer.flush();
writer.close();
output.setText(readFile());
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) {
list.add(line);
text.append(line);
text.append('
');
}
br.close();
} catch (IOException e) { }
String result = Arrays.toString(new ArrayList[]{list});
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"/> <application 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"> <intent-filter> <action android:name = "android.intent.action.MAIN" /> <category android:name = "android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
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
925 Views
