Ví dụ dùng facebook sdk example android

package com.javatechig.fbsample;

import java.util.Arrays;
import java.util.List;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.facebook.Request;
import com.facebook.Response;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
import com.facebook.model.GraphUser;
import com.facebook.widget.LoginButton;
import com.facebook.widget.LoginButton.UserInfoChangedCallback;

public class FBActivity extends FragmentActivity {

	private LoginButton loginBtn;
	private Button postImageBtn;
	private Button updateStatusBtn;

	private TextView userName;

	private UiLifecycleHelper uiHelper;

	private static final List<String> PERMISSIONS = Arrays.asList("publish_actions");

	private static String message = "Sample status posted from android app";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		uiHelper = new UiLifecycleHelper(this, statusCallback);
		uiHelper.onCreate(savedInstanceState);

		setContentView(R.layout.activity_facebook);

		userName = (TextView) findViewById(R.id.user_name);
		loginBtn = (LoginButton) findViewById(R.id.fb_login_button);
		loginBtn.setUserInfoChangedCallback(new UserInfoChangedCallback() {
			@Override
			public void onUserInfoFetched(GraphUser user) {
				if (user != null) {
					userName.setText("Hello, " + user.getName());
				} else {
					userName.setText("You are not logged");
				}
			}
		});

		postImageBtn = (Button) findViewById(R.id.post_image);
		postImageBtn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View view) {
				postImage();
			}
		});

		updateStatusBtn = (Button) findViewById(R.id.update_status);
		updateStatusBtn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {

			}
		});

		buttonsEnabled(false);
	}

	private Session.StatusCallback statusCallback = new Session.StatusCallback() {
		@Override
		public void call(Session session, SessionState state,
				Exception exception) {
			if (state.isOpened()) {
				buttonsEnabled(true);
				Log.d("FacebookSampleActivity", "Facebook session opened");
			} else if (state.isClosed()) {
				buttonsEnabled(false);
				Log.d("FacebookSampleActivity", "Facebook session closed");
			}
		}
	};

	public void buttonsEnabled(boolean isEnabled) {
		postImageBtn.setEnabled(isEnabled);
		updateStatusBtn.setEnabled(isEnabled);
	}

	public void postImage() {
		if (checkPermissions()) {
			Bitmap img = BitmapFactory.decodeResource(getResources(),
					R.drawable.ic_launcher);
			Request uploadRequest = Request.newUploadPhotoRequest(
					Session.getActiveSession(), img, new Request.Callback() {
						@Override
						public void onCompleted(Response response) {
							Toast.makeText(FBActivity.this,
									"Photo uploaded successfully",
									Toast.LENGTH_LONG).show();
						}
					});
			uploadRequest.executeAsync();
		} else {
			requestPermissions();
		}
	}

	public void postStatusMessage() {
		if (checkPermissions()) {
			Request request = Request.newStatusUpdateRequest(
					Session.getActiveSession(), message,
					new Request.Callback() {
						@Override
						public void onCompleted(Response response) {
							if (response.getError() == null)
								Toast.makeText(FBActivity.this,
										"Status updated successfully",
										Toast.LENGTH_LONG).show();
						}
					});
			request.executeAsync();
		} else {
			requestPermissions();
		}
	}

	public boolean checkPermissions() {
		Session s = Session.getActiveSession();
		if (s != null) {
			return s.getPermissions().contains("publish_actions");
		} else
			return false;
	}

	public void requestPermissions() {
		Session s = Session.getActiveSession();
		if (s != null)
			s.requestNewPublishPermissions(new Session.NewPermissionsRequest(
					this, PERMISSIONS));
	}

	@Override
	public void onResume() {
		super.onResume();
		uiHelper.onResume();
		buttonsEnabled(Session.getActiveSession().isOpened());
	}

	@Override
	public void onPause() {
		super.onPause();
		uiHelper.onPause();
	}

	@Override
	public void onDestroy() {
		super.onDestroy();
		uiHelper.onDestroy();
	}

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		uiHelper.onActivityResult(requestCode, resultCode, data);
	}

	@Override
	public void onSaveInstanceState(Bundle savedState) {
		super.onSaveInstanceState(savedState);
		uiHelper.onSaveInstanceState(savedState);
	}

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:facebook="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="20dp" >

    <com.facebook.widget.LoginButton
        android:id="@+id/fb_login_button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        facebook:confirm_logout="false"
        facebook:fetch_user_info="true" />

    <TextView
        android:id="@+id/user_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="10dp"
        android:textSize="18sp" />

    <Button
        android:id="@+id/update_status"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/update_status" />

    <Button
        android:id="@+id/post_image"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/post_image" />

</LinearLayout>