package com.example.app8;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException; 
import java.io.InputStreamReader;
import java.io.OutputStreamWriter; 
import android.os.Environment; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast;
public class MainActivity extends Activity {
	Button save,load;
	EditText message;
	TextView t1;
	String Message1;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
save=(Button)findViewById(R.id.button1); 
load=(Button)findViewById(R.id.button2); 
message=(EditText)findViewById(R.id.editText1); 
t1=(TextView)findViewById(R.id.textView1);
				save.setOnClickListener(new View.OnClickListener(){
				public void onClick(View v){
				//Get message from user store in message1 variable
				Message1 =message.getText().toString(); 
				try{
				//Create a new folder called MyDirectory in SDCard
		File  sdcard=Environment.getExternalStorageDirectory();
File directory=new File(sdcard.getAbsolutePath()+"/MyDirectory");
				directory.mkdirs();
				//Create a new file name textfile.txt inside MyDirectory
				File file=new File(directory,"textfile.txt");
			
		FileOutputStream fou=new FileOutputStream(file);
			OutputStreamWriter osw=new OutputStreamWriter(fou);
				try{
				//write a user data to file
				osw.append(Message1);
				osw.flush();
				osw.close();
Toast.makeText(getBaseContext(),"Datasaved",Toast.LENGTH_LONG).show();
				}catch(IOException e){
				e.printStackTrace();
								}
				}catch (FileNotFoundException e){
				e.printStackTrace();
				}
				}
				});
				load.setOnClickListener(new View.OnClickListener(){
				public void onClick(View v){
				try{
				File sdcard=Environment.getExternalStorageDirectory();
				File directory=new File(sdcard.getAbsolutePath()+"/MyDirectory");
				File file=new File(directory,"textfile.txt");
				FileInputStream fis=new FileInputStream(file);
				InputStreamReader isr=new InputStreamReader(fis);
				char[] data=new char[100];
				String final_data="";
				int size;
				try{
				while((size=isr.read(data))>0)
				{
				//read a data from file
				String read_data=String.copyValueOf(data,0,size);
				final_data+=read_data;
				data=new char[100];
				}
				//display the data in output
				Toast.makeText(getBaseContext(),"Message:"+final_data,Toast.LENGTH_LONG).show()
				;
				}catch(IOException e){
				e.printStackTrace();
				}
				}catch (FileNotFoundException e){
				e.printStackTrace();
				}
				}
				});
				}
			
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}



<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

   
    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="32dp"
        android:ems="10" android:inputType="text">

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="41dp"
        android:text="SAVEDATA"/>

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/button1"
        android:layout_alignBottom="@+id/button1"
        android:layout_alignParentRight="true"
        android:text="SHOWDATA"/>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linearLayout1"
        android:layout_centerHorizontal="true"/>

</RelativeLayout>




<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.app8"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE">
  </uses-permission>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.app8.MainActivity"
            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>