Creating an leanback extension for ExoPlayer. Leanback added support for new

transport control, which allows developers to plug in any media player. This
extension provides the PlayerAdapter implementation for ExoPlayer.

Demo:
https://drive.google.com/open?id=0B1GHUu5ruGULZTJVV1pVNlBuVjQ

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=165183497

core_settings.gradle

@@ -33,6 +33,7 @@ include modulePrefix + 'extension-okhttp'
 include modulePrefix + 'extension-opus'
 include modulePrefix + 'extension-opus'
 include modulePrefix + 'extension-vp9'
 include modulePrefix + 'extension-vp9'
 include modulePrefix + 'extension-rtmp'
 include modulePrefix + 'extension-rtmp'
+include modulePrefix + 'extension-leanback'
 
 
 project(modulePrefix + 'library').projectDir = new File(rootDir, 'library/all')
 project(modulePrefix + 'library').projectDir = new File(rootDir, 'library/all')
 project(modulePrefix + 'library-core').projectDir = new File(rootDir, 'library/core')
 project(modulePrefix + 'library-core').projectDir = new File(rootDir, 'library/core')
@@ -50,6 +51,7 @@ project(modulePrefix + 'extension-okhttp').projectDir = new File(rootDir, 'exten
 project(modulePrefix + 'extension-opus').projectDir = new File(rootDir, 'extensions/opus')
 project(modulePrefix + 'extension-opus').projectDir = new File(rootDir, 'extensions/opus')
 project(modulePrefix + 'extension-vp9').projectDir = new File(rootDir, 'extensions/vp9')
 project(modulePrefix + 'extension-vp9').projectDir = new File(rootDir, 'extensions/vp9')
 project(modulePrefix + 'extension-rtmp').projectDir = new File(rootDir, 'extensions/rtmp')
 project(modulePrefix + 'extension-rtmp').projectDir = new File(rootDir, 'extensions/rtmp')
+project(modulePrefix + 'extension-leanback').projectDir = new File(rootDir, 'extensions/leanback')
 
 
 if (gradle.ext.has('exoplayerIncludeCronetExtension')
 if (gradle.ext.has('exoplayerIncludeCronetExtension')
         && gradle.ext.exoplayerIncludeCronetExtension) {
         && gradle.ext.exoplayerIncludeCronetExtension) {

extensions/leanback/README.md

+# ExoPlayer Leanback Extension #
+
+## Description ##
+
+This [Leanback][] Extension provides a [PlayerAdapter][] implementation for
+Exoplayer.
+
+[PlayerAdapter]: https://developer.android.com/reference/android/support/v17/leanback/media/PlayerAdapter.html
+[Leanback]: https://developer.android.com/reference/android/support/v17/leanback/package-summary.html
+
+## Getting the extension ##
+
+The easiest way to use the extension is to add it as a gradle dependency:
+
+```gradle
+compile 'com.google.android.exoplayer:extension-leanback:rX.X.X'
+```
+
+where `rX.X.X` is the version, which must match the version of the ExoPlayer
+library being used.
+
+Alternatively, you can clone the ExoPlayer repository and depend on the module
+locally. Instructions for doing this can be found in ExoPlayer's
+[top level README][].
+
+[top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md

extensions/leanback/build.gradle

+// Copyright (C) 2017 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+apply from: '../../constants.gradle'
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion project.ext.compileSdkVersion
+    buildToolsVersion project.ext.buildToolsVersion
+
+    defaultConfig {
+        minSdkVersion project.ext.minSdkVersion
+        targetSdkVersion project.ext.targetSdkVersion
+    }
+}
+
+dependencies {
+    compile project(modulePrefix + 'library-core')
+    compile('com.android.support:leanback-v17:' + supportLibraryVersion)
+}
+
+ext {
+    javadocTitle = 'Leanback extension for Exoplayer library'
+}
+apply from: '../../javadoc_library.gradle'
+
+ext {
+    releaseArtifact = 'extension-leanback'
+    releaseDescription = 'Leanback extension for ExoPlayer.'
+}
+apply from: '../../publish.gradle'

extensions/leanback/src/main/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2017 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<manifest package="com.google.android.exoplayer2.ext.leanback"/>