add a PlayerNotificationManager to post media style notifications.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=188352116

.gitignore

@@ -43,6 +43,9 @@ cmake-build-debug
 dist
 tmp
 
+# External native builds
+.externalNativeBuild
+
 # VP9 extension
 extensions/vp9/src/main/jni/libvpx
 extensions/vp9/src/main/jni/libvpx_android_configs
@@ -62,3 +65,4 @@ extensions/cronet/jniLibs/*
 !extensions/cronet/jniLibs/README.md
 extensions/cronet/libs/*
 !extensions/cronet/libs/README.md
+

RELEASENOTES.md

@@ -35,6 +35,7 @@
   header ([#3926](https://github.com/google/ExoPlayer/issues/3926)).
 * Video: force rendering a frame periodically in `MediaCodecVideoRenderer` and
   `LibvpxVideoRenderer`, even if it is late.
+* Add PlayerNotificationManager.
 
 ### 2.7.0 ###
 

library/core/src/main/java/com/google/android/exoplayer2/ControlDispatcher.java

@@ -64,4 +64,12 @@ public interface ControlDispatcher {
    */
   boolean dispatchSetShuffleModeEnabled(Player player, boolean shuffleModeEnabled);
 
+  /**
+   * Dispatches a {@link Player#stop()} operation.
+   *
+   * @param player The {@link Player} to which the operation should be dispatched.
+   * @param reset Whether the player should be reset.
+   * @return True if the operation was dispatched. False if suppressed.
+   */
+  boolean dispatchStop(Player player, boolean reset);
 }

library/core/src/main/java/com/google/android/exoplayer2/DefaultControlDispatcher.java

@@ -47,4 +47,9 @@ public class DefaultControlDispatcher implements ControlDispatcher {
     return true;
   }
 
+  @Override
+  public boolean dispatchStop(Player player, boolean reset) {
+    player.stop(reset);
+    return true;
+  }
 }

library/ui/build.gradle

@@ -34,6 +34,7 @@ android {
 
 dependencies {
     implementation project(modulePrefix + 'library-core')
+    implementation 'com.android.support:support-media-compat:' + supportLibraryVersion
     implementation 'com.android.support:support-annotations:' + supportLibraryVersion
 }
 

library/ui/src/main/res/drawable-anydpi-v21/exo_icon_stop.xml

+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24"
+        android:viewportHeight="24">
+
+    <path
+        android:pathData="M0 0h24v24H0z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M6 6h12v12H6z" />
+</vector>

library/ui/src/main/res/values/drawables.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <drawable name="exo_controls_play">@drawable/exo_icon_play</drawable>
+  <drawable name="exo_controls_pause">@drawable/exo_icon_pause</drawable>
+  <drawable name="exo_controls_next">@drawable/exo_icon_next</drawable>
+  <drawable name="exo_controls_previous">@drawable/exo_icon_previous</drawable>
+  <drawable name="exo_controls_fastforward">@drawable/exo_icon_fastforward</drawable>
+  <drawable name="exo_controls_rewind">@drawable/exo_icon_rewind</drawable>
+  <drawable name="exo_notification_play">@drawable/exo_icon_play</drawable>
+  <drawable name="exo_notification_pause">@drawable/exo_icon_pause</drawable>
+  <drawable name="exo_notification_next">@drawable/exo_icon_next</drawable>
+  <drawable name="exo_notification_previous">@drawable/exo_icon_previous</drawable>
+  <drawable name="exo_notification_fastforward">@drawable/exo_icon_fastforward</drawable>
+  <drawable name="exo_notification_rewind">@drawable/exo_icon_rewind</drawable>
+  <drawable name="exo_notification_stop">@drawable/exo_icon_stop</drawable>
+</resources>