Steps to integrate Login with facebook in your app

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Step 1:
               
Download Facebook SDK and import it to in eclipse.

Step 2:
               
Generate a keyytool for your project or app.
                For Ubuntu : keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64

Step 3:
               
Create app for in facebook.
                Go to developer.facebook into menu -- app -- Create a New app. and click button 'Create app' it will create your app.

Step 4:
               
Than go to 'Settings' and click 'Add Platform' and select android.
                In that provide your project(app) package name and class name and add generated Key Hashes.
                --One more thing dont forgot to add "Contact Email".

Step 5:
               
Than go to 'Status and Review'.
                Enable or On the - Do you want to make this app and all its live features available to the general public?

Step 6:
               
Now you create new project in android or add below things in your porject:
                - Map FacebookSdk in your project add as library project.
                - Add your application id which is generated in developer.facebook in your string.xml as 'app_id'.
                - Add below things in your AndroidManifeat.xml
               

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

view raw AndroidManifest.xml hosted with ❤ by GitHub

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical">
	<com.facebook.widget.LoginButton
	android:id="@+id/authButton"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_gravity="center_horizontal"
	android:layout_marginTop="30dp"/>
	<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"/>
	</LinearLayout>

view raw main.xml hosted with ❤ by GitHub

	import android.content.Intent;
	import android.os.Bundle;
	import android.support.v4.app.FragmentActivity;
	import android.util.Log;
	import android.widget.TextView;
	import com.mihir.practice.R;
	import java.util.Arrays;
	import java.util.List;
	public class MainActivity extends FragmentActivity {
	private LoginButton loginBtn;
	private TextView userName;
	private UiLifecycleHelper uiHelper;
	private static final List<String> PERMISSIONS = Arrays.asList("publish_actions");
	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	uiHelper = new UiLifecycleHelper(this, statusCallback);
	uiHelper.onCreate(savedInstanceState);
	setContentView(R.layout.main);
	userName = (TextView) findViewById(R.id.user_name);
	loginBtn = (LoginButton) findViewById(R.id.authButton);
	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");
	}
	}
	});
	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) {
	}
	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);
	}
	}

view raw MainActivity.java hosted with ❤ by GitHub

Enjoy... :)