Use our new XDK! The XDK enables a richer messaging experience and new features will be added there. See the repository at https://github.com/layerhq/Android-XDK. Don't worry, Atlas-Android will still be supported in the meantime.
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.
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.
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.
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 |
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:0.4.15'
}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.
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.
The AtlasConversationsRecyclerView is a list of Conversations.
<com.layer.atlas.AtlasConversationsRecyclerView
android:id="@+id/conversations_list"android:layout_width="match_parent"android:layout_height="match_parent"
/>conversationsList = ((AtlasConversationsRecyclerView) findViewById(R.id.conversations_list))
.init(layerClient, picasso)
.setOnConversationClickListener(newOnConversationClickListener() {
publicvoidonConversationClick(AtlasConversationsAdapteradapter, Conversationconversation) {
launchMessagesList(conversation);
}
publicbooleanonConversationLongClick(AtlasConversationsAdapteradapter, Conversationconversation) {
returnfalse;
}
})
.addCellFactories(newTextCellFactory(), newThreePartImageCellFactory(layerClient, picasso),
newLocationCellFactory(picasso),
newSinglePartImageCellFactory(layerClient, picasso));The AtlasMessagesRecyclerView is list of Messages, rendered by AtlasCellFactories.
<com.layer.atlas.AtlasMessagesRecyclerView
android:id="@+id/messages_list"android:layout_width="match_parent"android:layout_height="match_parent"
/>messagesList = ((AtlasMessagesRecyclerView) findViewById(R.id.messages_list))
.init(layerClient, picasso)
.setConversation(conversation)
.addCellFactories(
newTextCellFactory(),
newThreePartImageCellFactory(this, layerClient, picasso),
newLocationCellFactory(this, picasso));The AtlasMessageComposer is a text entry area for composing messages and a menu of AttachmentSenders.
<com.layer.atlas.AtlasMessageComposer
android:id="@+id/message_composer"android:layout_width="match_parent"android:layout_height="wrap_content"
/>messageComposer = ((AtlasMessageComposer) findViewById(R.id.message_composer))
.init(layerClient)
.setConversation(conversation)
.setTextSender(newTextSender())
.addAttachmentSenders(
newCameraSender("Camera", R.drawable.ic_photo_camera_white_24dp, this, getApplicationContext().getPackageName() + ".file_provider"),
newGallerySender("Gallery", R.drawable.ic_photo_white_24dp, this),
newLocationSender("Location", R.drawable.ic_place_white_24dp, this));The AtlasTypingIndicator presents the user with active typists.
<com.layer.atlas.AtlasTypingIndicator
android:id="@+id/typing_indicator"android:layout_width="wrap_content"android:layout_height="wrap_content"
/>typingIndicator = newAtlasTypingIndicator(this)
.init(layerClient)
.setTypingIndicatorFactory(newBubbleTypingIndicatorFactory())
.setTypingActivityListener(newAtlasTypingIndicator.TypingActivityListener() {
publicvoidonTypingActivityChange(AtlasTypingIndicatortypingIndicator, booleanactive) {
messagesList.setFooterView(active ? typingIndicator : null);
}
});By default, Atlas supports the following types of messages.
| Type | Description |
|---|---|
| Generic | Default handler for unknown message types. Displays the mimetype and the content size |
| Text | Handler for text/plain content. |
| Location | Handler for location/coordinate content. Given lat/lon information, displays the location image (from Google maps), with a hyperlink that launches Maps application |
| ThreePartImage | Handler for 3 part JPEG image, with preview & dimensions. By default, displays the preview image. On tap, downloads and renders the full resolution image |
| SinglePartImage | Handler for any mime type that starts with image tag |
We expect to add support for other handlers in future. If you would like to build a handler, please check doc on message handlers.
An application server can directly upload user information to Layer server. This user information is called Identity. AtlasAddressBar and AtlasAvatar are controls that are used to render the Identity information.
AtlasAddressBar can be used to show a list of users. For eg, the list of users in a Conversation or to show a user list for creating a new Conversation.
<com.layer.atlas.AtlasAddressBar
android:id="@+id/address_bar"android:layout_width="match_parent"android:layout_height="match_parent"
/>addressBar = (AtlasAddressBar) findViewById(R.id.address_bar)
.init(layerClient, picasso)
.setOnConversationClickListener(newOnConversationClickListenertener() {
publicvoidonConversationClick(AtlasAddressBaraddressBar, Conversationconversation) {
setConversation(conversation);
}
})
.setOnParticipantSelectionChangeListener(newOnParticipantSelectionChangeListener() {
publicvoidonParticipantSelectionChanged(AtlasAddressBaraddressBar, List<Identity> participants) {
if (participants.isEmpty()) {
setConversation(null);
return;
}
try {
ConversationOptionsoptions = newConversationOptions().distinct(true);
setConversation(layerClient.newConversation(options, newHashSet<>(participants)), false);
} catch (LayerConversationExceptione) {
setConversation(e.getConversation(), false);
}
}
});AtlasAvatarcan be used to show information about one user, or as a cluster of multiple users. AtlasAvatar uses Picasso to render the avatar image. So, you need to init
<com.layer.atlas.AtlasAvatar
android:id="@+id/avatar"android:layout_width="@dimen/atlas_avatar_item_single"android:layout_height="@dimen/atlas_avatar_item_single"android:layout_margin="@dimen/atlas_padding_normal"/>// To create an avatarmAvatarCluster = (AtlasAvatar) itemView.findViewById(R.id.avatar);
// To initialize PicassoviewHolder.mAvatarCluster
.init(mPicasso)
.setStyle(conversationStyle.getAvatarStyle());
// To set identites meant for the avatar clusterHashSet<Identity> participants = newHashSet<>(conversation.getParticipants());
viewHolder.mAvatarCluster.setParticipants(participants);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.
Atlas is licensed under the terms of the Apache License, version 2.0. Please see the LICENSE file for full details.
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.