Code style improvements

app/src/main/java/de/danoeh/antennapod/activity/MediaplayerActivity.java

@@ -619,12 +619,11 @@ public abstract class MediaplayerActivity extends CastEnabledActivity implements
 
     public void onEventMainThread(ServiceEvent event) {
         Log.d(TAG, "onEvent(" + event + ")");
-        switch(event.action) {
+        if (event.action == ServiceEvent.Action.SERVICE_STARTED) {
-            case SERVICE_STARTED:
             if (controller != null) {
                 controller.init();
             }
-                break;
+
         }
     }
 

app/src/main/java/de/danoeh/antennapod/adapter/DefaultActionButtonCallback.java

@@ -80,15 +80,13 @@ public class DefaultActionButtonCallback implements ActionButtonCallback {
                     Toast.makeText(context, R.string.download_canceled_msg, Toast.LENGTH_LONG).show();
                 }
             } else { // media is downloaded
-                if (item.hasMedia() && item.getMedia().isCurrentlyPlaying()) {
+                if (media.isCurrentlyPlaying()) {
                     PlaybackService.startIfNotRunning(context, media, true, false);
                     context.sendBroadcast(new Intent(PlaybackService.ACTION_PAUSE_PLAY_CURRENT_EPISODE));
-                }
+                } else if (media.isCurrentlyPaused()) {
-                else if (item.hasMedia() && item.getMedia().isCurrentlyPaused()) {
                     PlaybackService.startIfNotRunning(context, media, true, false);
                     context.sendBroadcast(new Intent(PlaybackService.ACTION_RESUME_PLAY_CURRENT_EPISODE));
-                }
+                } else {
-                else {
                     DBTasks.playMedia(context, media, false, true, false);
                 }
             }

app/src/main/java/de/danoeh/antennapod/fragment/ExternalPlayerFragment.java

@@ -168,7 +168,11 @@ public class ExternalPlayerFragment extends Fragment {
 
     private boolean loadMediaInfo() {
         Log.d(TAG, "Loading media info");
-        if (controller != null) {
+        if (controller == null) {
+            Log.w(TAG, "loadMediaInfo was called while PlaybackController was null!");
+            return false;
+        }
+
         Playable media = controller.getMedia();
         if (media != null) {
             txtvTitle.setText(media.getEpisodeTitle());
@@ -195,10 +199,6 @@ public class ExternalPlayerFragment extends Fragment {
             Log.w(TAG,  "loadMediaInfo was called while the media object of playbackService was null!");
             return false;
         }
-        } else {
-            Log.w(TAG, "loadMediaInfo was called while playbackService was null!");
-            return false;
-        }
     }
 
     private String getPositionString(int position, int duration) {

core/src/main/java/de/danoeh/antennapod/core/service/PlayerWidgetJobService.java

@@ -31,9 +31,6 @@ public class PlayerWidgetJobService extends JobIntentService {
     private PlaybackService playbackService;
     private final Object waitForService = new Object();
 
-    public PlayerWidgetJobService() {
-    }
-
     public static void updateWidget(Context context) {
         enqueueWork(context, PlayerWidgetJobService.class, 0, new Intent(context, PlayerWidgetJobService.class));
     }

core/src/main/java/de/danoeh/antennapod/core/storage/DBTasks.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.database.Cursor;
+import android.support.annotation.Nullable;
 import android.support.v4.content.ContextCompat;
 import android.util.Log;
 
@@ -150,10 +151,14 @@ public final class DBTasks {
      *
      * @param context  Might be used for accessing the database
      * @param feeds    List of Feeds that should be refreshed.
-     * @param callback Called after everything was added enqueued for download
+     * @param callback Called after everything was added enqueued for download. Might be null.
      */
-    public static void refreshAllFeeds(final Context context, final List<Feed> feeds, Runnable callback) {
+    public static void refreshAllFeeds(final Context context, final List<Feed> feeds, @Nullable Runnable callback) {
-        if (isRefreshing.compareAndSet(false, true)) {
+        if (!isRefreshing.compareAndSet(false, true)) {
+            Log.d(TAG, "Ignoring request to refresh all feeds: Refresh lock is locked");
+            return;
+        }
+
         new Thread(() -> {
             if (feeds != null) {
                 refreshFeeds(context, feeds);
@@ -183,9 +188,6 @@ public final class DBTasks {
                 callback.run();
             }
         }).start();
-        } else {
-            Log.d(TAG, "Ignoring request to refresh all feeds: Refresh lock is locked");
-        }
     }
 
     /**

core/src/main/java/de/danoeh/antennapod/core/util/playback/Playable.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Parcelable;
 import android.preference.PreferenceManager;
+import android.support.annotation.Nullable;
 import android.util.Log;
 
 import java.util.List;
@@ -183,6 +184,7 @@ public interface Playable extends Parcelable,
          *
          * @return The restored Playable object
          */
+        @Nullable
         public static Playable createInstanceFromPreferences(Context context) {
             long currentlyPlayingMedia = PlaybackPreferences.getCurrentlyPlayingMedia();
             if (currentlyPlayingMedia != PlaybackPreferences.NO_MEDIA_PLAYING) {

core/src/main/java/de/danoeh/antennapod/core/util/playback/PlaybackController.java

@@ -14,6 +14,7 @@ import android.os.Build;
 import android.os.IBinder;
 import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.v4.content.ContextCompat;
 import android.text.TextUtils;
 import android.util.Log;
@@ -212,10 +213,14 @@ public abstract class PlaybackController {
      * Returns an intent that starts the PlaybackService and plays the last
      * played media or null if no last played media could be found.
      */
-    private Intent getPlayLastPlayedMediaIntent() {
+    @Nullable private Intent getPlayLastPlayedMediaIntent() {
         Log.d(TAG, "Trying to restore last played media");
         Playable media = PlayableUtils.createInstanceFromPreferences(activity);
-        if (media != null) {
+        if (media == null) {
+            Log.d(TAG, "No last played media found");
+            return null;
+        }
+
         Intent serviceIntent = new Intent(activity, PlaybackService.class);
         serviceIntent.putExtra(PlaybackService.EXTRA_PLAYABLE, media);
         serviceIntent.putExtra(PlaybackService.EXTRA_START_WHEN_PREPARED, false);
@@ -229,9 +234,6 @@ public abstract class PlaybackController {
                 lastIsStream || !fileExists);
         return serviceIntent;
     }
-        Log.d(TAG, "No last played media found");
-        return null;
-    }