public class FbActivity extends Activity{
private CallbackManager callbackManager;
private TextView info;
private LoginButton loginButton;
ShareDialog shareDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    try {
        FacebookSdk.sdkInitialize(getApplicationContext());
    setContentView(R.layout.fblogin);

    info = (TextView)findViewById(R.id.info);
    loginButton = (LoginButton)findViewById(R.id.login_button);



callbackManager = CallbackManager.Factory.create();

        shareDialog = new ShareDialog(this);

        ShareLinkContent content = new ShareLinkContent.Builder()
                .setContentUrl(Uri.parse("https://developers.facebook.com"))
                .build();

        ShareDialog.show(FbActivity.this, content);

        if (ShareDialog.canShow(ShareLinkContent.class)) {
            ShareLinkContent linkContent = new ShareLinkContent.Builder()
                    .setContentTitle("Hello Facebook")
                    .setContentDescription(
                            "The 'Hello Facebook' sample  showcases simple Facebook integration")
                    .setContentUrl(Uri.parse("http://developers.facebook.com/android"))
                    .build();

            shareDialog.show(linkContent);
        }
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
    @Override
    public void onSuccess(LoginResult loginResult) {
        info.setText(
                "User ID: "
                        + loginResult.getAccessToken().getUserId()
                        + "n" +
                        "Auth Token: "
                        + loginResult.getAccessToken().getToken()
        );
    }

    @Override
    public void onCancel() {
        info.setText("Login attempt canceled.");
    }

    @Override
    public void onError(FacebookException e) {
        info.setText("Login attempt failed.");
    }
});

}catch (Exception e)
 {
  e.printStackTrace();
  }

}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    callbackManager.onActivityResult(requestCode, resultCode, data);
}


}