สร้าง Facebook Login ด้วย Android Studio

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apply plugin: 'android-library'
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dependencies {
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    compile 'com.android.support:support-v4:13.0.+'
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    compile files('libs/bolts.jar')
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}
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android {
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    compileSdkVersion 19
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    buildToolsVersion "19.0.3"
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    defaultConfig {
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        minSdkVersion 8
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        targetSdkVersion 19
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    }
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    lintOptions {
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        abortOnError false
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    }
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    sourceSets {
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        main {
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            manifest.srcFile 'AndroidManifest.xml'
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            java.srcDirs = ['src']
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            res.srcDirs = ['res']
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        }
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    }
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}

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dependencies {
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    compile fileTree(include: ['*.jar'], dir: 'libs')
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    compile 'com.android.support:appcompat-v7:19.+'
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    compile project(':facebook')
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}

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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    xmlns:tools="http://schemas.android.com/tools"
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    android:layout_width="match_parent"
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    android:layout_height="match_parent"
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    android:orientation="vertical">
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    <com.facebook.widget.LoginButton
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        android:id="@+id/facebookLoginButton"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:layout_gravity="center"
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        android:layout_marginTop="50dp" />
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</LinearLayout>

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<meta-data
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    android:name="com.facebook.sdk.ApplicationId"
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    android:value="@string/app_id" />
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<activity android:name="com.facebook.LoginActivity" />

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<uses-permission
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    android:name="android.permission.INTERNET" />

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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    package="com.devahoy.facebooksdk.sample" >
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    <uses-permission
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        android:name="android.permission.INTERNET" />
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    <application
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        android:allowBackup="true"
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        android:icon="@drawable/ic_launcher"
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        android:label="@string/app_name"
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        android:theme="@style/AppTheme" >
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        <activity
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            android:name="com.devahoy.facebooksdk.sample.MainActivity"
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            android:label="@string/app_name" >
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            <intent-filter>
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                <action android:name="android.intent.action.MAIN" />
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                <category android:name="android.intent.category.LAUNCHER" />
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            </intent-filter>
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        </activity>
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        <meta-data
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            android:name="com.facebook.sdk.ApplicationId"
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            android:value="@string/app_id" />
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        <activity android:name="com.facebook.LoginActivity" />
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    </application>
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</manifest>

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package com.devahoy.facebooksdk.sample;
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import android.content.Intent;
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import android.os.Bundle;
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import android.support.v4.app.Fragment;
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import android.support.v7.app.ActionBarActivity;
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import android.util.Log;
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import android.view.LayoutInflater;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.Toast;
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import com.facebook.Request;
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import com.facebook.Response;
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import com.facebook.Session;
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import com.facebook.SessionState;
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import com.facebook.UiLifecycleHelper;
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import com.facebook.model.GraphUser;
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import com.facebook.widget.LoginButton;
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public class MainActivity extends ActionBarActivity {
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    private MainFragment mainFragment;
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        if (savedInstanceState == null) {
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            // Add the fragment on initial activity setup
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            mainFragment = new MainFragment();
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            getSupportFragmentManager()
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                    .beginTransaction()
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                    .add(android.R.id.content, mainFragment)
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                    .commit();
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        } else {
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            // Or set the fragment from restored state info
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            mainFragment = (MainFragment) getSupportFragmentManager()
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                    .findFragmentById(android.R.id.content);
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        }
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    }
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    @Override
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    public boolean onCreateOptionsMenu(Menu menu) {
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        // Inflate the menu; this adds items to the action bar if it is present.
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        getMenuInflater().inflate(R.menu.main, menu);
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        return true;
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    }
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    @Override
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    public boolean onOptionsItemSelected(MenuItem item) {
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        // Handle action bar item clicks here. The action bar will
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        // automatically handle clicks on the Home/Up button, so long
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        // as you specify a parent activity in AndroidManifest.xml.
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        int id = item.getItemId();
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        if (id == R.id.action_settings) {
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            return true;
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        }
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        return super.onOptionsItemSelected(item);
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    }
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    public static class MainFragment extends Fragment {
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        private static final String TAG = MainFragment.class.getName();
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        private UiLifecycleHelper uiHelper;
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        private Session.StatusCallback callback = new Session.StatusCallback() {
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            @Override
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            public void call(Session session, SessionState state, Exception exception) {
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                onSessionStateChange(session, state, exception);
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            }
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        };
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        private void onSessionStateChange(Session session, SessionState state, Exception exception) {
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            if (state.isOpened()) {
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                Request request = Request.newMeRequest(session, new Request.GraphUserCallback() {
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                    @Override
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                    public void onCompleted(GraphUser user, Response response) {
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                        Toast.makeText(getActivity(),
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                                "Hello " + user.getName(),
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                                Toast.LENGTH_LONG).show();
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                    }
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                });
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                request.executeAsync();
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            } else if (state.isClosed()) {
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                Log.i(TAG, "Logged out...");
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            }
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        }
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        @Override
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        public void onResume() {
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            super.onResume();
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            Session session = Session.getActiveSession();
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            if (session != null &&
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                    (session.isOpened() || session.isClosed()) ) {
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                onSessionStateChange(session, session.getState(), null);
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            }
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            uiHelper.onResume();
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        }
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        @Override
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        public void onActivityResult(int requestCode, int resultCode, Intent data) {
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            super.onActivityResult(requestCode, resultCode, data);
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            uiHelper.onActivityResult(requestCode, resultCode, data);
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        }
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        @Override
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        public void onPause() {
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            super.onPause();
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            uiHelper.onPause();
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        }
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        @Override
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        public void onDestroy() {
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            super.onDestroy();
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            uiHelper.onDestroy();
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        }
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        @Override
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        public void onSaveInstanceState(Bundle outState) {
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            super.onSaveInstanceState(outState);
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            uiHelper.onSaveInstanceState(outState);
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        }
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        @Override
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        public void onCreate(Bundle savedInstanceState) {
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            super.onCreate(savedInstanceState);
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            uiHelper = new UiLifecycleHelper(getActivity(), callback);
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            uiHelper.onCreate(savedInstanceState);
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        }
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        @Override
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        public View onCreateView(LayoutInflater inflater, ViewGroup container,
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                                 Bundle savedInstanceState) {
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            View rootView = inflater.inflate(R.layout.activity_main, container,
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                    false);
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            LoginButton authButton = (LoginButton) rootView.findViewById(R.id.facebookLoginButton);
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            authButton.setFragment(this);
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            return rootView;
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        }
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    }
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}

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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              xmlns:tools="http://schemas.android.com/tools"
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              android:layout_width="match_parent"
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              android:layout_height="match_parent"
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              android:orientation="vertical">
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    <com.facebook.widget.LoginButton
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        android:id="@+id/facebookLoginButton"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:layout_gravity="center"
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        android:layout_marginTop="50dp" />
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</LinearLayout>