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How to create text file in Android

How to create text file in Android

A simple example on creating text files in Android.
First create a new Android project in Android studio.

Create a new Layout XML file with name notepad.xml in res>layout>notepad.xml.
And edit it as following :

<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"
    android:background="#222222"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:text="SIMPLE NOTEPAD"
        android:textColor="#FF8866"
        android:textSize="25sp"
        android:textStyle="bold"
        android:typeface="monospace" />

    <EditText
        android:id="@+id/contenttxt"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:layout_gravity="center"
        android:layout_marginBottom="10dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:background="#ffffff"
        android:textColor="#000000"
        android:layout_marginTop="10dp"
        android:gravity="top|left"
        android:scrollHorizontally="false"
        android:singleLine="false"
        android:text="Hi" />

    <Button
        android:id="@+id/exportbtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:background="#FF6644"
        android:gravity="center"
        android:paddingBottom="10dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingTop="10dp"
        android:text="EXPORT TO SDCARD"
        android:textColor="#FFFFFF"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/resulttxt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:text=""
        android:textColor="#ffffff"
        android:textSize="20sp"
        android:textStyle="bold"
        android:typeface="monospace" />



</LinearLayout>

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Now make a new class (.java) file with name NotePad.java and edit it as following :

package app.mysqlapp;

/**
 * Created by parallelcodes on 17-Jun-15.
 */

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.text.format.DateFormat;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class NotePad extends Activity {
    EditText ed;
    Button btn;
    TextView result;
    String h;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.notepad);
        ed = (EditText) findViewById(R.id.contenttxt);
        result = (TextView) findViewById(R.id.resulttxt);
        btn = (Button) findViewById(R.id.exportbtn);

        btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                try {
                    h = DateFormat.format("MM-dd-yyyyy-h-mmssaa", System.currentTimeMillis()).toString(); 
                    // this will create a new name everytime and unique
                    File root = new File(Environment.getExternalStorageDirectory(), "Notes");  
                    // if external memory exists and folder with name Notes
                    if (!root.exists()) {
                        root.mkdirs(); // this will create folder.
                    }
                    File filepath = new File(root, h + ".txt");  // file path to save
                    FileWriter writer = new FileWriter(filepath);
                    writer.append(ed.getText().toString());
                    writer.flush();
                    writer.close();
                    String m = "File generated with name " + h + ".txt";
                    result.setText(m);

                } catch (IOException e) {
                    e.printStackTrace();
                    result.setText(e.getMessage().toString());
                }

            }
        });

    }
}

Now you will have to add the permission for our app to read and write memory in AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="app.mysqlapp" >

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name=".NotePad"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

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