Verifying Google Play Services

AuthActivity.java

public class AuthActivity extends Activity {
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
  }
}

@Override
protected void onResume() {
  super.onResume();
  if (checkPlayServices()) {
    // Then we're good to go!
  }
}

private boolean checkPlayServices() {
  int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
  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();
}

static final int REQUEST_CODE_RECOVER_PLAY_SERVICES = 1001;
 
@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.",
            Toast.LENGTH_SHORT).show();
        finish();
      }
      return;
  }
  super.onActivityResult(requestCode, resultCode, data);
}