##Preview Release 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 as well as an example app.

Note: Atlas for Android is currently a Preview Release. This repository will be updated substantially in the coming weeks.

###Example App The Atlas example app is located in the layer-atlas-messenger directory.

• QR Code: To get started as fast as possible, visit the Experience Atlas page, download and launch the app, then scan your Layer Atlas QR code. A free Sandbox account is available at Layer.com.
• App ID: If you already have a Layer App ID, you can bypass the QR code by entering your App ID in MessengerApp before building, in LAYER_APP_ID.

###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
AtlasConversationsList	A list of Conversations
AtlasMessagesList	A list of Messages
AtlasMessageComposer	A View used to compose and send Messages
AtlasParticipantPicker	Participant selection with dynamic filtering
AtlasTypingIndicator	Displays TypingIndicator information for a Conversation
Interfaces
Participant	Allows Atlas classes to render Participant information
ParticipantProvider	Provides Atlas classes with Participants

##Installation See the installation guide

#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

###AtlasConversationList

The AtlasConversationsList is a list of Conversations.

####XML

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

####Java

conversationsList = (AtlasConversationsList) findViewById(R.id.conversations_list);
conversationsList.init(conversationsList, layerClient, participantProvider);
conversationsList.setClickListener(new ConversationClickListener() {
	public void onItemClick(Conversation conversation) {
		openChatScreen(conversation, false);
	}
});

##Messages

###AtlasMessageList

The AtlasMessagesList is list of Messages, rendered as Cells.

####XML

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

####Java

messagesList = (AtlasMessagesList) findViewById(R.id.messages_list);
messagesList.init(layerClient, participantProvider);
messagesList.setConversation(conversation);
messagesList.setItemClickListener(new ItemClickListener() {
	public void onItemClick(Cell item) {
		if (Atlas.MIME_TYPE_ATLAS_LOCATION.equals(item.messagePart.getMimeType())) {
       	String jsonLonLat = new String(item.messagePart.getData());
       	/* launch map app */
		}
	}
});

###AtlasMessageComposer

The AtlasMessageComposer is a set of buttons and a text entry area for composing messages.

####XML

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

####Java

AtlasMessageComposer messageComposer = (AtlasMessageComposer) findViewById(R.id.message_composer);
messageComposer.init(layerClient, conversation);
messageComposer.setListener(new AtlasMessageComposer.Listener() {
	public boolean beforeSend(Message message) {
		if (conversation == null) {
			// create new one
			conversation = layerClient.newConversation(participantsPicker.getSelectedUserIds());
			messageComposer.setConversation(conversation);
		}

		// push
		Map<String, String> metadata = new HashMap<String, String>();
		String text = senderName + ": " + new String(message.getMessageParts().get(0).getData());
		metadata.put(Message.ReservedMetadataKeys.PushNotificationAlertMessageKey.getKey(), text);
		message.setMetadata(metadata);
		return true;
	}
});

messageComposer.registerMenuItem("Image", new OnClickListener() {
	public void onClick(View v) {
		Intent intent = new Intent().setType("image/*").setAction(Intent.ACTION_GET_CONTENT);
		startActivityForResult(Intent.createChooser(intent, "Select Picture"), REQUEST_CODE_GALLERY);
	}
});

###AtlasTypingIndicator

The AtlasTypingIndicator presents the user with active typers.

####XML

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

####Java

typingIndicator = (AtlasTypingIndicator) findViewById(R.id.typing_indicator);
typingIndicator.init(conv, new AtlasTypingIndicator.DefaultTypingIndicatorCallback(participantProvider));

##Participants

###AtlasParticipantPicker

The AtlasParticipantPicker allows the user to search and select one or more participants.

####XML

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

####Java

AtlasParticipantPicker participantsPicker = (AtlasParticipantPicker) findViewById(R.id.participant_picker);
participantsPicker.init(userIdsToSkip, participantProvider);

#Styling Atlas allows you to quickly style its components through code, layouts, and themes. For a complete list of stylable component attributes, see atlas-styles.xml

####Set attributes on individual views within your layouts:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:atlas="http://schemas.android.com/apk/res-auto"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <com.layer.atlas.AtlasMessagesList
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        atlas:myBubbleColor="#FF0"
        />

</LinearLayout>

####Customize the global Atlas theme from your styles.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="AppTheme" parent="Theme.Atlas.Light">
        <item name="AtlasMessageList">@style/CustomAtlasMessageList</item>
    </style>

    <style name="CustomAtlasMessageList" parent="AtlasMessageList">
        <item name="myBubbleColor">#FF0</item>
    </style>
    
</resources>

#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

• Oleg Orlov
• Steven Jones