Tint audio controls to be visible in dark theme

Fixes #4353
Closes #4466
// FREEBIE

src/org/thoughtcrime/securesms/ConversationItem.java

@@ -63,6 +63,8 @@ import org.thoughtcrime.securesms.mms.SlideClickListener;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.recipients.Recipients;
 import org.thoughtcrime.securesms.util.DateUtils;
+import org.thoughtcrime.securesms.util.DynamicTheme;
+import org.thoughtcrime.securesms.util.TextSecurePreferences;
 import org.thoughtcrime.securesms.util.Util;
 
 import java.util.HashSet;
@@ -231,7 +233,12 @@ public class ConversationItem extends LinearLayout
     if (messageRecord.isOutgoing()) {
       bodyBubble.getBackground().setColorFilter(defaultBubbleColor, PorterDuff.Mode.MULTIPLY);
       mediaThumbnail.setBackgroundColorHint(defaultBubbleColor);
-      audioView.setTint(conversationRecipients.getColor().toConversationColor(context));
+
+      if (DynamicTheme.LIGHT.equals(TextSecurePreferences.getTheme(context))) {
+        audioView.setTint(conversationRecipients.getColor().toConversationColor(context));
+      } else {
+        audioView.setTint(Color.WHITE);
+      }
     } else {
       int color = recipient.getColor().toConversationColor(context);
       bodyBubble.getBackground().setColorFilter(color, PorterDuff.Mode.MULTIPLY);

src/org/thoughtcrime/securesms/audio/AudioSlidePlayer.java

@@ -95,8 +95,11 @@ public class AudioSlidePlayer {
         Log.w(TAG, "onComplete");
         synchronized (AudioSlidePlayer.this) {
           mediaPlayer = null;
-          audioAttachmentServer.stop();
-          audioAttachmentServer = null;
+
+          if (audioAttachmentServer != null) {
+            audioAttachmentServer.stop();
+            audioAttachmentServer = null;
+          }
         }
 
         notifyOnStop();

src/org/thoughtcrime/securesms/util/DynamicTheme.java

@@ -7,6 +7,9 @@ import org.thoughtcrime.securesms.R;
 
 public class DynamicTheme {
 
+  public static final String DARK  = "dark";
+  public static final String LIGHT = "light";
+
   private int currentTheme;
 
   public void onCreate(Activity activity) {
@@ -27,7 +30,7 @@ public class DynamicTheme {
   protected int getSelectedTheme(Activity activity) {
     String theme = TextSecurePreferences.getTheme(activity);
 
-    if (theme.equals("dark")) return R.style.TextSecure_DarkTheme;
+    if (theme.equals(DARK)) return R.style.TextSecure_DarkTheme;
 
     return R.style.TextSecure_LightTheme;
   }