Internal storage of data in android

There are so sum types of storage of data ways :-
internal storage,External Storage(SD Card),URL storage on web,Sqlite ....etc SQl........

1:-internal storage of data in android Device not in SD card

package com.example.internalstorage;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
EditText editTextFileName,editTextData;
Button saveButton,readButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

editTextFileName=(EditText)findViewById(R.id.editText1);
editTextData=(EditText)findViewById(R.id.editText2);
saveButton=(Button)findViewById(R.id.button1);
readButton=(Button)findViewById(R.id.button2);

saveButton.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
String filename=editTextFileName.getText().toString();
String data=editTextData.getText().toString();

FileOutputStream fos;
  try {
   fos = openFileOutput(filename, Context.MODE_PRIVATE);
   fos.write(data.getBytes());
   fos.close();
 
   Toast.makeText(getApplicationContext(),filename + " saved",Toast.LENGTH_LONG).show();
 
 
  } catch (FileNotFoundException e) {e.printStackTrace();}
  catch (IOException e) {e.printStackTrace();}

}

});

readButton.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
String filename=editTextFileName.getText().toString();
StringBuffer stringBuffer = new StringBuffer();
try {
   BufferedReader inputReader = new BufferedReader(new InputStreamReader(
           openFileInput(filename)));
   String inputString;
               
   while ((inputString = inputReader.readLine()) != null) {
       stringBuffer.append(inputString + "\n");
   }
 
} catch (IOException e) {
   e.printStackTrace();
}
Toast.makeText(getApplicationContext(),stringBuffer.toString(),Toast.LENGTH_LONG).show();
 
}

});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}

main.xml

:-

<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"

    tools:context=".MainActivity" >

    <EditText

        android:id="@+id/editText1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"

        android:layout_alignParentTop="true"

        android:layout_marginRight="20dp"

        android:layout_marginTop="24dp"

        android:ems="10" >

        <requestFocus />

    </EditText>

    <EditText

        android:id="@+id/editText2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignRight="@+id/editText1"

        android:layout_below="@+id/editText1"

        android:layout_marginTop="24dp"

        android:ems="10" />

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/editText1"

        android:layout_alignBottom="@+id/editText1"

        android:layout_alignParentLeft="true"

        android:text="File Name:" />

    <TextView

        android:id="@+id/textView2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/editText2"

        android:layout_alignBottom="@+id/editText2"

        android:layout_alignParentLeft="true"

        android:text="Data:" />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/editText2"

        android:layout_below="@+id/editText2"

        android:layout_marginLeft="70dp"

        android:layout_marginTop="16dp"

        android:text="save" />

    <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_toRightOf="@+id/button1"

        android:text="read" />

</RelativeLayout>

Manifest:-

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.internalstorage"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="16" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.internalstorage.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>

                               Just click on save button then there will generate a toast of message your data has been                                     store or not ............

 Final result generate over there in Particular File name