notes.txt

- Add:
	- "classpath 'com.google.gms:google-services:2.0.0-alpha3" to buildScript.dependencies
	- "maven { url 'https://maven.fabric.io/public' }" to repositories
	- "apply plugin: 'com.google.gms.google-services'" to end of build.gradle
	- "compile 'br.com.estudio89:social:1.0'" to dependencies
    - "compile "com.google.android.gms:play-services-auth:8.4.0"" to dependencies
	- "<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>" to your AndroidManifest.xml, under the application tag.
	- "<meta-data android:name="io.fabric.ApiKey" android:value="@string/twitter_fabric_key"/>" to your AndroidManifest.xml, under the application tag.
	- "<activity android:name="com.facebook.FacebookActivity"
            android:configChanges=
                "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:theme="@android:style/Theme.Translucent.NoTitleBar"
            android:label="@string/app_name" />" to your AndroidManifest.xml, under the application tag.

- In your strings.xml file, add the following strings:
	<string name="facebook_app_id"></string> // id of facebook app
    <string name="google_auth_server_id"></string> // id of server for google authentication
    <string name="twitter_consumer_key"></string> // consumer key for twitter authentication
    <string name="twitter_consumer_secret"></string> // consumer secret for twitter authentication
    <string name="twitter_fabric_key"></string> // key for fabric api (twitter)

- In your login activity:

	- Implement SocialAuthListener

	- Add the attribute

	- In the onCreate method, build a SocialAuthManager, eg:
		socialAuthManager = new SocialAuthManager.Builder(this)
                .setListener(this)
                .setLoginButtonId("facebook", R.id.fb_login_button)
                .setLoginButtonId("google", R.id.google_login_button)
                .setLoginButtonId("twitter", R.id.twitter_login_button)
                .setLoginButtonId("linkedin", R.id.btn_linkedin)
                .build();
        socialAuthManager.initializeSDK(this);

    - Right after setting the content view, setup login:
    	socialAuthManager.setupLogin(this);

    - Inside onActivityResult do this:
	    @Override
	    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	        super.onActivityResult(requestCode, resultCode, data);

	        if (socialAuthManager != null) {
	            socialAuthManager.onActivityResult(requestCode, resultCode, data);
	        }

	    }

    - Inside onStart do this:
        @Override
            protected void onStart() {
                super.onStart();
                if (socialAuthManager != null) {
                    socialAuthManager.onStart();
                }
            }
	- Inside onStop do this:
        @Override
        protected void onStop() {
            super.onStop();
            if (socialAuthManager != null) {
                socialAuthManager.onStop();
            }
        }

    - For logging out:
    	socialAuthManager.logout();

- In the layout file for your login activity, add the respective buttons:

	<com.facebook.login.widget.LoginButton
        android:id="@+id/fb_login_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp" />

    <com.google.android.gms.common.SignInButton
        android:id="@+id/google_login_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/fb_login_button"/>

    <com.twitter.sdk.android.core.identity.TwitterLoginButton
        android:id="@+id/twitter_login_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/google_login_button" />

    <Button
        android:id="@+id/btn_linkedin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/twitter_login_button"
        android:text="Login with Linkedin"/>

- Antes de gerar o arquivo google-services.json, é preciso passar o SHA-1 gerado a partir da keystore utilizada (para debug e release).
Olhar link: https://developers.google.com/android/guides/client-auth