From 59e98546c9a26bbbcfe34e5efe6f2e721a8fcc1b Mon Sep 17 00:00:00 2001
From: Adrian Ulrich <adrian@blinkenlights.ch>
Date: Sun, 3 Sep 2017 15:30:03 +0200
Subject: [PATCH] Unregister contentObserver while PlaybackService gets
 destroyed.

---
 .../android/medialibrary/MediaLibrary.java    | 19 ++++++++++++++++++-
 .../android/vanilla/PlaybackService.java      |  2 ++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/ch/blinkenlights/android/medialibrary/MediaLibrary.java b/src/ch/blinkenlights/android/medialibrary/MediaLibrary.java
index 2f84d8bc..dd6654a4 100644
--- a/src/ch/blinkenlights/android/medialibrary/MediaLibrary.java
+++ b/src/ch/blinkenlights/android/medialibrary/MediaLibrary.java
@@ -12,7 +12,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>. 
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
 package ch.blinkenlights.android.medialibrary;
@@ -274,6 +274,23 @@ public class MediaLibrary  {
 		}
 	}
 
+	/**
+	 * Unregisters a content observer which was previously registered
+	 * by calling registerContentObserver().
+	 *
+	 * @param observer the content observer to unregister.
+	 */
+	public static void unregisterContentObserver(ContentObserver observer) {
+		if (sContentObserver == null)
+			throw new IllegalStateException("No ContentObserver was registered!");
+
+		if (!sContentObserver.equals(observer))
+			throw new IllegalArgumentException("Passed content observer was not the one you registered!");
+
+		// Sanity check passed: unregister observer.
+		sContentObserver = null;
+	}
+
 	/**
 	 * Broadcasts a change to the observer, which will queue and dispatch
 	 * the event to any registered observer
diff --git a/src/ch/blinkenlights/android/vanilla/PlaybackService.java b/src/ch/blinkenlights/android/vanilla/PlaybackService.java
index 534b7dd0..db02f7e5 100644
--- a/src/ch/blinkenlights/android/vanilla/PlaybackService.java
+++ b/src/ch/blinkenlights/android/vanilla/PlaybackService.java
@@ -598,6 +598,8 @@ public final class PlaybackService extends Service
 		// defer wakelock and close audioFX
 		enterSleepState();
 
+		MediaLibrary.unregisterContentObserver(mObserver);
+
 		if (mMediaPlayer != null) {
 			mMediaPlayer.release();
 			mMediaPlayer = null;