Fixed sharing ViewModel with multiple feeds

app/build.gradle

@@ -139,10 +139,6 @@ dependencies {
     implementation "com.android.support:recyclerview-v7:$supportVersion"
     compileOnly 'com.google.android.wearable:wearable:2.2.0'
 
-    // ViewModel and LiveData
-    implementation "android.arch.lifecycle:extensions:$lifecycle_version"
-    annotationProcessor "android.arch.lifecycle:compiler:$lifecycle_version"
-
     implementation "org.apache.commons:commons-lang3:$commonslangVersion"
     implementation "commons-io:commons-io:$commonsioVersion"
     implementation "org.jsoup:jsoup:$jsoupVersion"

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

@@ -1,6 +1,5 @@
 package de.danoeh.antennapod.fragment;
 
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.ClipData;
 import android.content.Context;
 import android.content.Intent;
@@ -21,18 +20,11 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;
-
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.request.RequestOptions;
 import com.joanzapata.iconify.Iconify;
-
-import de.danoeh.antennapod.activity.MainActivity;
-import de.danoeh.antennapod.viewmodel.FeedLoaderViewModel;
-import org.apache.commons.lang3.StringUtils;
-import org.jsoup.Jsoup;
-import org.jsoup.nodes.Document;
-
 import de.danoeh.antennapod.R;
+import de.danoeh.antennapod.activity.MainActivity;
 import de.danoeh.antennapod.core.dialog.DownloadRequestErrorDialogCreator;
 import de.danoeh.antennapod.core.feed.Feed;
 import de.danoeh.antennapod.core.glide.ApGlideSettings;
@@ -48,6 +40,9 @@ import io.reactivex.MaybeOnSubscribe;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.Disposable;
 import io.reactivex.schedulers.Schedulers;
+import org.apache.commons.lang3.StringUtils;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
 
 /**
  * Displays information about a feed.
@@ -56,8 +51,9 @@ public class FeedInfoFragment extends Fragment {
 
     private static final String EXTRA_FEED_ID = "de.danoeh.antennapod.extra.feedId";
     private static final String TAG = "FeedInfoActivity";
-    private Feed feed;
 
+    private Feed feed;
+    private Disposable disposable;
     private ImageView imgvCover;
     private TextView txtvTitle;
     private TextView txtvDescription;
@@ -69,8 +65,6 @@ public class FeedInfoFragment extends Fragment {
     private TextView txtvAuthorHeader;
     private ImageView imgvBackground;
 
-    private Disposable disposable;
-
     public static FeedInfoFragment newInstance(Feed feed) {
         FeedInfoFragment fragment = new FeedInfoFragment();
         Bundle arguments = new Bundle();
@@ -131,12 +125,21 @@ public class FeedInfoFragment extends Fragment {
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         long feedId = getArguments().getLong(EXTRA_FEED_ID);
-        ViewModelProviders.of(getActivity()).get(FeedLoaderViewModel.class).getFeed(feedId)
+        disposable = Maybe.create((MaybeOnSubscribe<Feed>) emitter -> {
+            Feed feed = DBReader.getFeed(feedId);
+            if (feed != null) {
+                emitter.onSuccess(feed);
+            } else {
+                emitter.onComplete();
+            }
+        })
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(result -> {
-                    feed = result;
-                    showFeed();
-                    startPostponedEnterTransition();
-                }).dispose();
+                            feed = result;
+                            showFeed();
+                        }, error -> Log.d(TAG, Log.getStackTraceString(error)),
+                        this::startPostponedEnterTransition);
     }
 
     private void showFeed() {

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

@@ -1,12 +1,12 @@
 package de.danoeh.antennapod.fragment;
 
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.support.v14.preference.SwitchPreference;
 import android.support.v7.preference.ListPreference;
 import android.support.v7.preference.PreferenceFragmentCompat;
+import android.util.Log;
 import de.danoeh.antennapod.R;
 import de.danoeh.antennapod.activity.MainActivity;
 import de.danoeh.antennapod.core.dialog.ConfirmationDialog;
@@ -14,15 +14,23 @@ import de.danoeh.antennapod.core.feed.Feed;
 import de.danoeh.antennapod.core.feed.FeedFilter;
 import de.danoeh.antennapod.core.feed.FeedPreferences;
 import de.danoeh.antennapod.core.preferences.UserPreferences;
+import de.danoeh.antennapod.core.storage.DBReader;
 import de.danoeh.antennapod.core.storage.DBWriter;
 import de.danoeh.antennapod.dialog.AuthenticationDialog;
 import de.danoeh.antennapod.dialog.EpisodeFilterDialog;
-import de.danoeh.antennapod.viewmodel.FeedLoaderViewModel;
+import io.reactivex.Maybe;
+import io.reactivex.MaybeOnSubscribe;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.Disposable;
+import io.reactivex.schedulers.Schedulers;
 
 public class FeedSettingsFragment extends PreferenceFragmentCompat {
     private static final CharSequence PREF_EPISODE_FILTER = "episodeFilter";
     private static final String EXTRA_FEED_ID = "de.danoeh.antennapod.extra.feedId";
+    private static final String TAG = "FeedSettingsFragment";
+
     private Feed feed;
+    private Disposable disposable;
     private FeedPreferences feedPreferences;
 
     public static FeedSettingsFragment newInstance(Feed feed) {
@@ -39,7 +47,16 @@ public class FeedSettingsFragment extends PreferenceFragmentCompat {
 
         postponeEnterTransition();
         long feedId = getArguments().getLong(EXTRA_FEED_ID);
-        ViewModelProviders.of(getActivity()).get(FeedLoaderViewModel.class).getFeed(feedId)
+        disposable = Maybe.create((MaybeOnSubscribe<Feed>) emitter -> {
+            Feed feed = DBReader.getFeed(feedId);
+            if (feed != null) {
+                emitter.onSuccess(feed);
+            } else {
+                emitter.onComplete();
+            }
+        })
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(result -> {
                     feed = result;
                     feedPreferences = feed.getPreferences();
@@ -52,8 +69,8 @@ public class FeedSettingsFragment extends PreferenceFragmentCompat {
 
                     updateAutoDeleteSummary();
                     updateAutoDownloadEnabled();
-                    startPostponedEnterTransition();
-                }).dispose();
+                }, error -> Log.d(TAG, Log.getStackTraceString(error)),
+                this::startPostponedEnterTransition);
     }
 
     @Override
@@ -62,6 +79,14 @@ public class FeedSettingsFragment extends PreferenceFragmentCompat {
         ((MainActivity) getActivity()).getSupportActionBar().setTitle(R.string.feed_settings_label);
     }
 
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        if (disposable != null) {
+            disposable.dispose();
+        }
+    }
+
     private void setupEpisodeFilterPreference() {
         findPreference(PREF_EPISODE_FILTER).setOnPreferenceClickListener(preference -> {
             new EpisodeFilterDialog(getContext(), feedPreferences.getFilter()) {

app/src/main/java/de/danoeh/antennapod/viewmodel/FeedLoaderViewModel.java

@@ -1,30 +0,0 @@
-package de.danoeh.antennapod.viewmodel;
-
-import android.arch.lifecycle.ViewModel;
-import de.danoeh.antennapod.core.feed.Feed;
-import de.danoeh.antennapod.core.storage.DBReader;
-import io.reactivex.Maybe;
-
-public class FeedLoaderViewModel extends ViewModel {
-    private Feed feed;
-
-    public Maybe<Feed> getFeed(long feedId) {
-        if (feed == null) {
-            return loadFeed(feedId);
-        } else {
-            return Maybe.just(feed);
-        }
-    }
-
-    private Maybe<Feed> loadFeed(long feedId) {
-        return Maybe.create(emitter -> {
-            Feed feed = DBReader.getFeed(feedId);
-            if (feed != null) {
-                this.feed = feed;
-                emitter.onSuccess(feed);
-            } else {
-                emitter.onComplete();
-            }
-        });
-    }
-}

build.gradle

@@ -45,7 +45,6 @@ project.ext {
     targetSdkVersion = 28
 
     supportVersion = "27.1.1"
-    lifecycle_version = "1.1.1"
     workManagerVersion = "1.0.1"
     awaitilityVersion = "3.1.2"
     commonsioVersion = "2.5"