Facebook Login using custom Button 

In this tutorial first of all if you are using eclipse then to download Facebook SDK from this website 

https://developers.facebook.com/docs/android/ and if you are using Android Studio then import dependencies in build.gradle file compile 'com.facebook.android:facebook-android-sdk:4.5.0'

To make the project in the https://developers.facebook.com/ and get the facebook id and add in to the string.xml file.

In XML file to add this code

<LinearLayout

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:layout_marginLeft="10dp"

    android:layout_marginRight="10dp"


    android:layout_marginTop="50dp"


    android:orientation="horizontal">




    <Button

        android:id="@+id/btn_facebook"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:background="@drawable/fb_btn"

        android:text="Facebook"

        android:textAllCaps="false"

        android:textColor="@android:color/white" />

</LinearLayout> 

In java file add this code

public class LoginActivity extends Activity implements View.OnClickListener {


    Intent intent;

    Button btn_facebook;

    private CallbackManager mCallbackManager;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.login);


        // Reference of Component

        btn_facebook = (Button) findViewById(R.id.btn_facebook);


        //Click Listener of Components

        btn_facebook.setOnClickListener(this);


        //Facebook login

        List<String> permissions = new ArrayList<String>();

        permissions.add("email");


        FacebookSdk.sdkInitialize(this.getApplicationContext());

        AppEventsLogger.activateApp(this);

        mCallbackManager = CallbackManager.Factory.create();

        LoginManager.getInstance().registerCallback(mCallbackManager,

                new FacebookCallback<LoginResult>() {

                    @Override

                    public void onSuccess(LoginResult loginResult) {

                        Log.d("Success", "Login");




                        GraphRequest request = GraphRequest.newMeRequest(

                               loginResult.getAccessToken(),

                                new GraphRequest.GraphJSONObjectCallback() {

                                    @Override

                                    public void onCompleted(JSONObject object, GraphResponse response

                                        Log.v("LoginActivity", response.toString());

                                        try {


                                            String id = object.getString("id");

                                            String name = object.getString("name");

                                            //String email = object.getString("email");

                                       //     Toast.makeText(getApplicationContext(), "email ="+email, Toast.LENGTH_LONG).show();

                                           Intent intent = new Intent(getApplicationContext(),Registration.class);

                                            intent.putExtra("Fbname",name);

                                            intent.putExtra("Fbid",id);

                                            startActivity(intent);

                                            overridePendingTransition(R.anim.open_next,R.anim.close_next);

                                            finish();

                                        } catch(Exception e){

                                            e.printStackTrace();

                                        }

                                    }

                                });

                        //Toast.makeText(getApplicationContext(),""+response_code,Toast.LENGTH_LONG).show();

                        Bundle parameters = new Bundle();

                        parameters.putString("fields", "id,name,email,gender,birthday");

                        request.setParameters(parameters);

                        request.executeAsync();

                    }

                    @Override

                    public void onCancel() {

               Toast.makeText(LoginActivity.this, "Login Cancel", Toast.LENGTH_LONG).show();

                    }

                    @Override

                    public void onError(FacebookException exception) {

                        Toast.makeText(LoginActivity.this, exception.getMessage(), Toast.LENGTH_LONG).show();

                    }

                });

    }

    @Override

    public void onClick(View view) {


        switch (view.getId()){

            case R.id.btn_facebook:

                loginFacebook();

                break;

        }

    }

    public void loginFacebook(){

        LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile","email","user_birthday","user_friends"));

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        if(mCallbackManager.onActivityResult(requestCode, resultCode, data)) {

            return;

        }

    }

}

In Android Manifest file you have to add the following meta tag 




<activity    android:name="com.facebook.FacebookActivity"    android:label="@string/app_name"/>

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

<meta-data    android:name="com.facebook.sdk.ApplicationName"    android:value="@string/app_name" />
<meta-data    android:name="com.facebook.sdk.WebDialogTheme"    android:resource="@android:style/Theme.Translucent.NoTitleBar" />

<provider    android:name="com.facebook.FacebookContentProvider"    android:authorities="com.facebook.app.FacebookContentProvider233936543368280"    android:exported="true" />