#Atlas

##Overview

Atlas is an open source framework of customizable UI components for use with the Layer SDK designed to get messaging tested and integrated quickly. This repository contains the Atlas library. For a fully-featured messaging app, see the open source Atlas Messenger project, which uses this Atlas library and the Layer SDK.

Requirements

Atlas requires Android API Level >= 14 (OS v4.0). The Layer SDK version requirements for each release are tightly coupled. See the release notes for details about specifics.

###Feature Priorities We are actively adding features for the following priorities:

1. Animated GIFs
2. Video
3. Automated UI tests

Please see the list of branches for work in progress. If you don't see a feature you are interested in there, please start a branch and submit a pull request.

##Key Concepts With Atlas, Messages have types. One type might be rich text, and another might be a map location or photo. Anything that can be packaged into a set of MIME Types and data can be represented by Atlas.

Under the hood, MessageSenders send individual Message types, and AtlasCellFactories render them. Additional Message types can be added to your app by extending these classes. For a list of default types, see the messagetypes subpackage.

##API Quickstart The Atlas library is located in the layer-atlas directory. The table below details the most important classes in Atlas and is hyperlinked directly to the current java file.

Views
AtlasConversationsRecyclerView	A list of Conversations
AtlasMessagesRecyclerView	A list of Messages within a Conversation
AtlasMessageComposer	A View used to compose and send Messages
AtlasAddressBar	Participant selection with dynamic filtering
AtlasTypingIndicator	Displays TypingIndicator information for a Conversation
Factories and Senders
AtlasCellFactory	Classifies, parses, and renders Messages
MessageSender	Sends Messages
AtlasTypingIndicator. TypingIndicatorFactory	Renders typing indicators

##Installation

Add the following to the build.gradle:

repositories {
    maven { url "https://raw.githubusercontent.com/layerhq/releases-android/master/releases/" }
    maven { url "https://raw.githubusercontent.com/layerhq/Atlas-Android/master/releases/" }
}

dependencies {
    compile 'com.layer.atlas:layer-atlas:0.3.0'
}

###Libraries

Atlas uses Picasso for image caching, resizing, and processing, and Subsampling Scale Image View for image its in-app lightbox. Other dependencies include the Android recyclerview, appcompat, and design libraries.

##Component Details Atlas is divided into five basic View components, typically presented on a screen with a user's conversations, a screen with messages within a conversation, and a component that lets the user select participants.

###Conversations

####AtlasConversationsRecyclerView

The AtlasConversationsRecyclerView is a list of Conversations.

#####XML

<com.layer.atlas.AtlasConversationsRecyclerView
    android:id="@+id/conversations_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

#####Java

conversationsList = ((AtlasConversationsRecyclerView) findViewById(R.id.conversations_list))
	.init(layerClient, picasso)
	.setOnConversationClickListener(new OnConversationClickListener() {
		public void onConversationClick(AtlasConversationsAdapter adapter, Conversation conversation) {
			launchMessagesList(conversation);
		}
		
		public boolean onConversationLongClick(AtlasConversationsAdapter adapter, Conversation conversation) {
		    return false;
		}
	});

###Messages

####AtlasMessagesRecyclerView

The AtlasMessagesRecyclerView is list of Messages, rendered by AtlasCellFactories.

#####XML

<com.layer.atlas.AtlasMessagesRecyclerView
    android:id="@+id/messages_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

#####Java

messagesList = ((AtlasMessagesRecyclerView) findViewById(R.id.messages_list))
	.init(layerClient, picasso)
	.setConversation(conversation)
	.addCellFactories(
		new TextCellFactory(),
		new ThreePartImageCellFactory(this, layerClient, picasso),
		new LocationCellFactory(this, picasso));

####AtlasMessageComposer

The AtlasMessageComposer is a text entry area for composing messages and a menu of AttachmentSenders.

#####XML

<com.layer.atlas.AtlasMessageComposer
    android:id="@+id/message_composer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    />

#####Java

messageComposer = ((AtlasMessageComposer) findViewById(R.id.message_composer))
	.init(layerClient)
	.setTextSender(new TextSender())
	.addAttachmentSenders(
		new CameraSender("Camera", R.drawable.ic_photo_camera_white_24dp, this),
		new GallerySender("Gallery", R.drawable.ic_photo_white_24dp, this),
		new LocationSender("Location", R.drawable.ic_place_white_24dp, this));

####AtlasTypingIndicator

The AtlasTypingIndicator presents the user with active typists.

#####XML

<com.layer.atlas.AtlasTypingIndicator
    android:id="@+id/typing_indicator"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    />

#####Java

typingIndicator = new AtlasTypingIndicator(this)
	.init(layerClient)
	.setTypingIndicatorFactory(new BubbleTypingIndicatorFactory())
	.setTypingActivityListener(new AtlasTypingIndicator.TypingActivityListener() {
		public void onTypingActivityChange(AtlasTypingIndicator typingIndicator, boolean active) {
			messagesList.setFooterView(active ? typingIndicator : null);
		}
	});

###Participants

####AtlasParticipantPicker

The AtlasParticipantPicker allows the user to search and select one or more participants, or jump to existing Conversations.

#####XML

<com.layer.atlas.AtlasAddressBar
    android:id="@+id/address_bar"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

#####Java

addressBar = (AtlasAddressBar) findViewById(R.id.address_bar)
	.init(layerClient, picasso)
	.setOnConversationClickListener(new OnConversationClickListenertener() {
		public void onConversationClick(AtlasAddressBar addressBar, Conversation conversation) {
			setConversation(conversation);
		}
	})
	.setOnParticipantSelectionChangeListener(new OnParticipantSelectionChangeListener() {
		public void onParticipantSelectionChanged(AtlasAddressBar addressBar, List<Identity> participants) {
			if (participants.isEmpty()) {
				setConversation(null);
				return;
			}
			try {
				ConversationOptions options = new ConversationOptions().distinct(true);
				setConversation(layerClient.newConversation(options, new HashSet<>(participants)), false);
			} catch (LayerConversationException e) {
				setConversation(e.getConversation(), false);
			}
		}
	});

##Contributing Atlas is an Open Source project maintained by Layer. Feedback and contributions are always welcome and the maintainers try to process patches as quickly as possible. Feel free to open up a Pull Request or Issue on Github.

##License

Atlas is licensed under the terms of the Apache License, version 2.0. Please see the LICENSE file for full details.

##Contact

Atlas was developed in San Francisco by the Layer team. If you have any technical questions or concerns about this project feel free to reach out to Layer Support.

###Credits

• Steven Jones