check for Play Services

package com.example.testgcm;


import android.app.Activity;

import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;

public class MainActivity extends Activity {
    static final int REQUEST_CODE_RECOVER_PLAY_SERVICES = 1001;
      static final int REQUEST_CODE_PICK_ACCOUNT = 1002;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
   
     @Override
      protected void onResume() {
        super.onResume();
        if (checkPlayServices()) {
          // Then we're good to go!
        }
      }
   
   
     private boolean checkPlayServices() {
          //  int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
          int status = ConnectionResult.SERVICE_VERSION_UPDATE_REQUIRED;
            if (status != ConnectionResult.SUCCESS) {
              if (GooglePlayServicesUtil.isUserRecoverableError(status)) {
                showErrorDialog(status);
              } else {
                Toast.makeText(this, "This device is not supported.", Toast.LENGTH_LONG).show();
                finish();
              }
              return false;
            }
            return true;
          }
   
     void showErrorDialog(int code) {
            GooglePlayServicesUtil.getErrorDialog(code, this, REQUEST_CODE_RECOVER_PLAY_SERVICES).show();
          }
   
     @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
          case REQUEST_CODE_RECOVER_PLAY_SERVICES:
            if (resultCode == RESULT_CANCELED) {
              Toast.makeText(this, "Google Play Services must be installed and up-to-date.",
                  Toast.LENGTH_SHORT).show();
              finish();
            }
            return;
        
        }
        super.onActivityResult(requestCode, resultCode, data);
      }
   

   

}

output
-------------------
We get an alert



Note
-----------------
Here we should add google play service library project as a dependency project and the following tag should be included in the application tag of the manifest

  <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />


@integer/google_play_services_version this points to GooglePlayServices library project "version.xml"