How Can I Solve Class Cast Exception

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Mobile

Android

Class code

package com.example.vetriselvanv.myapplication;
/**
 * Created by vetriselvan.v on 5/16/2015.
 */
public class DeviceDetails extends MainActivity {

    private String PhoneNumber;
    private String IMEI;
    private String BatteryLevel;


    public String getPhoneNumber() {
        return PhoneNumber;
    }
    public void setPhoneNumber(String aPhoneNumber) {
        PhoneNumber =aPhoneNumber ;
    }
    public String getIMEI() {

        return IMEI;
    }
    public void setIMEI(String aIMEI) {
        IMEI=aIMEI;
    }
    public String getBatteryLevel()
    {
        return  BatteryLevel;
    }
    public void setBatteryLevel(String aBatteryLevel)
    {
        BatteryLevel =aBatteryLevel;
    }

}

Main Activity
package com.example.vetriselvanv.myapplication;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.telephony.TelephonyManager;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {
String string,mPhoneNumber;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final DeviceDetails device=(DeviceDetails)getApplicationContext();//here
device.setIMEI(string);
device.setBatteryLevel(mPhoneNumber);
final String IMEI=device.getIMEI();
final String Phone=device.getPhoneNumber();
Toast.makeText(getApplicationContext(),"Device ID"+IMEI+"\nMobile Number"+Phone, Toast.LENGTH_LONG).show();
Intent i = new Intent(getBaseContext(), DeviceDetails.class);
startActivity(i);
Vetri();
Toast();
}
public void Vetri()
{

TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
string = tm.getDeviceId();
mPhoneNumber = tm.getLine1Number();
EditText et=(EditText)findViewById(R.id.editText);
EditText ett=(EditText)findViewById(R.id.editText2);
ett.setText(mPhoneNumber);
et.setText(string);



}
Manifest code

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
package="com.example.vetriselvanv.myapplication" >

<application>
android:name="com.example.vetriselvanv.myapplication.DeviceDetails"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity>
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN">

<category android:name="android.intent.category.LAUNCHER">


<activity android:name=".DeviceDetails">