From e99ce0a33b83f4f127c9deb5ef5bba5855e726c1 Mon Sep 17 00:00:00 2001
From: ByteHamster <info@bytehamster.com>
Date: Sun, 12 May 2019 00:20:30 +0200
Subject: [PATCH] Do not query database on main thread

---
 .../antennapod/fragment/ChaptersFragment.java | 31 ++++++++++++++++---
 .../antennapod/fragment/CoverFragment.java    | 30 +++++++++++++-----
 2 files changed, 49 insertions(+), 12 deletions(-)

diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/ChaptersFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/ChaptersFragment.java
index 8f2073ed0..998ff698e 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/ChaptersFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/ChaptersFragment.java
@@ -2,6 +2,7 @@ package de.danoeh.antennapod.fragment;
 
 import android.os.Bundle;
 import android.support.v4.app.ListFragment;
+import android.util.Log;
 import android.view.View;
 import android.widget.ListView;
 
@@ -12,12 +13,17 @@ import de.danoeh.antennapod.core.feed.Chapter;
 import de.danoeh.antennapod.core.util.playback.Playable;
 import de.danoeh.antennapod.core.util.playback.PlaybackController;
 import de.greenrobot.event.EventBus;
+import io.reactivex.Maybe;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.Disposable;
+import io.reactivex.schedulers.Schedulers;
 
 
 public class ChaptersFragment extends ListFragment {
     private static final String TAG = "ChaptersFragment";
     private ChaptersListAdapter adapter;
     private PlaybackController controller;
+    private Disposable disposable;
 
 
     @Override
@@ -42,10 +48,7 @@ public class ChaptersFragment extends ListFragment {
         controller = new PlaybackController(getActivity(), false) {
             @Override
             public boolean loadMediaInfo() {
-                if (getMedia() == null) {
-                    return false;
-                }
-                onMediaChanged(getMedia());
+                ChaptersFragment.this.loadMediaInfo();
                 return true;
             }
 
@@ -55,7 +58,7 @@ public class ChaptersFragment extends ListFragment {
             }
         };
         controller.init();
-        onMediaChanged(controller.getMedia());
+        loadMediaInfo();
         EventBus.getDefault().register(this);
     }
 
@@ -73,6 +76,24 @@ public class ChaptersFragment extends ListFragment {
         }
     }
 
+    private void loadMediaInfo() {
+        if (disposable != null) {
+            disposable.dispose();
+        }
+        disposable = Maybe.create(emitter -> {
+                    Playable media = controller.getMedia();
+                    if (media != null) {
+                        emitter.onSuccess(media);
+                    } else {
+                        emitter.onComplete();
+                    }
+                })
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(media -> onMediaChanged((Playable) media),
+                        error -> Log.e(TAG, Log.getStackTraceString(error)));
+    }
+
     private void onMediaChanged(Playable media) {
         if (adapter != null) {
             adapter.setMedia(media);
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/CoverFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/CoverFragment.java
index 88d748c5a..87d58b1ff 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/CoverFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/CoverFragment.java
@@ -1,6 +1,7 @@
 package de.danoeh.antennapod.fragment;
 
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.v4.app.Fragment;
 import android.util.Log;
 import android.view.LayoutInflater;
@@ -18,6 +19,10 @@ import de.danoeh.antennapod.core.glide.ApGlideSettings;
 import de.danoeh.antennapod.core.util.playback.Playable;
 import de.danoeh.antennapod.core.util.playback.PlaybackController;
 import de.greenrobot.event.EventBus;
+import io.reactivex.Maybe;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.Disposable;
+import io.reactivex.schedulers.Schedulers;
 
 /**
  * Displays the cover and the title of a FeedItem.
@@ -31,6 +36,7 @@ public class CoverFragment extends Fragment {
     private TextView txtvEpisodeTitle;
     private ImageView imgvCover;
     private PlaybackController controller;
+    private Disposable disposable;
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
@@ -44,11 +50,24 @@ public class CoverFragment extends Fragment {
     }
 
     private void loadMediaInfo() {
-        Playable media = controller.getMedia();
-        if (media == null) {
-            Log.w(TAG, "loadMediaInfo was called while media was null");
-            return;
+        if (disposable != null) {
+            disposable.dispose();
         }
+        disposable = Maybe.create(emitter -> {
+                    Playable media = controller.getMedia();
+                    if (media != null) {
+                        emitter.onSuccess(media);
+                    } else {
+                        emitter.onComplete();
+                    }
+                })
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(media -> displayMediaInfo((Playable) media),
+                        error -> Log.e(TAG, Log.getStackTraceString(error)));
+    }
+
+    private void displayMediaInfo(@NonNull Playable media) {
         txtvPodcastTitle.setText(media.getFeedTitle());
         txtvEpisodeTitle.setText(media.getEpisodeTitle());
         Glide.with(this)
@@ -73,9 +92,6 @@ public class CoverFragment extends Fragment {
         controller = new PlaybackController(getActivity(), false) {
             @Override
             public boolean loadMediaInfo() {
-                if (getMedia() == null) {
-                    return false;
-                }
                 CoverFragment.this.loadMediaInfo();
                 return true;
             }