[Google Maps API v2] Location button Issue

[Muhammad Mujtaba Kiani]

The issue is I am running it on my phone with wifi and gps, maps are 
displying but location button on top right corner is not working.
Kindly help me.
*

MainActivity*

package com.example.mapexample;

import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;

public class MainActivity extends FragmentActivity{

final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;
private LocationManager locationManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
  // Do a null check to confirm that we have not already instantiated the 
map.
    if (myMap == null) {
     
     myMap = ((SupportMapFragment) 
getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
  // Check if we were successful in obtaining the map.
        if (myMap != null) {
            // The Map is verified. It is now safe to manipulate the map.
         setUpMap();
        }
    }
 }

 @Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();

  int resultCode = 
GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
  
  if (resultCode == ConnectionResult.SUCCESS){
   Toast.makeText(getApplicationContext(), 
     "isGooglePlayServicesAvailable SUCCESS", 
     Toast.LENGTH_LONG).show();
  }else{
   GooglePlayServicesUtil.getErrorDialog(resultCode, this, 
RQS_GooglePlayServices);
  }
  
 }

 private void setUpMap(){
    myMap.setMyLocationEnabled(true);
    
}
}

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

    <permission
        android:name="com.example.mapexample.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission 
android:name="com.example.mapexample.permission.MAPS_RECEIVE" />

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="8" />

    <uses-permission 
android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
        <uses-permission 
android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission 
android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" 
/>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission 
android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <uses-library
            android:name="com.google.android.maps"
            android:required="true" />

        <activity
            android:name="com.example.mapexample.MainMenuActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <activity
            android:name="com.example.mapexample.MainActivity">
         </activity>
         <activity
            android:name="com.example.mapexample.ATMlist">
         </activity>
         <activity
            android:name="com.example.mapexample.DirectionsActivity">
         </activity>
        
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="USING MY KEY HERE" />
    </application>

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

</manifest>

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