Display a splash screen when the app starts.

app/src/main/AndroidManifest.xml

@@ -144,7 +144,7 @@
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name"
-            android:theme="@style/AppTheme.NoActionBarWithTransparentStatusBar">
+            android:theme="@style/AppTheme.Launcher">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/ml/docilealligator/infinityforreddit/MainActivity.java

@@ -157,6 +157,8 @@ public class MainActivity extends AppCompatActivity implements SortTypeBottomShe
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
+        setTheme(R.style.AppTheme_NoActionBarWithTransparentStatusBar);
+
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 

app/src/main/java/ml/docilealligator/infinityforreddit/PostDataSourceFactory.java

@@ -78,7 +78,7 @@ class PostDataSourceFactory extends DataSource.Factory {
 
     @NonNull
     @Override
-    public DataSource create() {
+    public DataSource<String, Post> create() {
         if(postType == PostDataSource.TYPE_FRONT_PAGE) {
             postDataSource = new PostDataSource(retrofit, accessToken, locale, postType, sortType,
                     filter, nsfw);

app/src/main/java/ml/docilealligator/infinityforreddit/PostFragment.java

@@ -450,10 +450,10 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
             stopLazyMode();
         }
 
+        mAdapter.setNetworkState(null);
         mFetchPostInfoLinearLayout.setVisibility(View.GONE);
         hasPost = false;
         mPostViewModel.refresh();
-        mAdapter.setNetworkState(null);
     }
 
     private void showErrorView(int stringResId) {

app/src/main/java/ml/docilealligator/infinityforreddit/PostViewModel.java

@@ -23,7 +23,7 @@ public class PostViewModel extends ViewModel {
     private LiveData<PagedList<Post>> posts;
     private MutableLiveData<Boolean> nsfwLiveData;
     private MutableLiveData<String> sortTypeLiveData;
-    private PostViewModel.NSFWAndSortTypeLiveData NSFWAndSortTypeLiveData;
+    private NSFWAndSortTypeLiveData nsfwAndSortTypeLiveData;
 
     public PostViewModel(Retrofit retrofit, String accessToken, Locale locale, int postType, String sortType,
                          int filter, boolean nsfw) {
@@ -42,7 +42,7 @@ public class PostViewModel extends ViewModel {
         sortTypeLiveData = new MutableLiveData<>();
         sortTypeLiveData.postValue(sortType);
 
-        NSFWAndSortTypeLiveData = new NSFWAndSortTypeLiveData(nsfwLiveData, sortTypeLiveData);
+        nsfwAndSortTypeLiveData = new NSFWAndSortTypeLiveData(nsfwLiveData, sortTypeLiveData);
 
         PagedList.Config pagedListConfig =
                 (new PagedList.Config.Builder())
@@ -50,7 +50,7 @@ public class PostViewModel extends ViewModel {
                         .setPageSize(25)
                         .build();
 
-        posts = Transformations.switchMap(NSFWAndSortTypeLiveData, nsfwAndSort -> {
+        posts = Transformations.switchMap(nsfwAndSortTypeLiveData, nsfwAndSort -> {
             postDataSourceFactory.changeNSFWAndSortType(nsfwLiveData.getValue(), sortTypeLiveData.getValue());
             return (new LivePagedListBuilder(postDataSourceFactory, pagedListConfig)).build();
         });
@@ -73,7 +73,7 @@ public class PostViewModel extends ViewModel {
         sortTypeLiveData = new MutableLiveData<>();
         sortTypeLiveData.postValue(sortType);
 
-        NSFWAndSortTypeLiveData = new NSFWAndSortTypeLiveData(nsfwLiveData, sortTypeLiveData);
+        nsfwAndSortTypeLiveData = new NSFWAndSortTypeLiveData(nsfwLiveData, sortTypeLiveData);
 
         PagedList.Config pagedListConfig =
                 (new PagedList.Config.Builder())
@@ -81,7 +81,7 @@ public class PostViewModel extends ViewModel {
                         .setPageSize(25)
                         .build();
 
-        posts = Transformations.switchMap(NSFWAndSortTypeLiveData, nsfwAndSort -> {
+        posts = Transformations.switchMap(nsfwAndSortTypeLiveData, nsfwAndSort -> {
             postDataSourceFactory.changeNSFWAndSortType(nsfwLiveData.getValue(), sortTypeLiveData.getValue());
             return (new LivePagedListBuilder(postDataSourceFactory, pagedListConfig)).build();
         });
@@ -104,7 +104,7 @@ public class PostViewModel extends ViewModel {
         sortTypeLiveData = new MutableLiveData<>();
         sortTypeLiveData.postValue(sortType);
 
-        NSFWAndSortTypeLiveData = new NSFWAndSortTypeLiveData(nsfwLiveData, sortTypeLiveData);
+        nsfwAndSortTypeLiveData = new NSFWAndSortTypeLiveData(nsfwLiveData, sortTypeLiveData);
 
         PagedList.Config pagedListConfig =
                 (new PagedList.Config.Builder())
@@ -112,7 +112,7 @@ public class PostViewModel extends ViewModel {
                         .setPageSize(25)
                         .build();
 
-        posts = Transformations.switchMap(NSFWAndSortTypeLiveData, nsfwAndSort -> {
+        posts = Transformations.switchMap(nsfwAndSortTypeLiveData, nsfwAndSort -> {
             postDataSourceFactory.changeNSFWAndSortType(nsfwLiveData.getValue(), sortTypeLiveData.getValue());
             return (new LivePagedListBuilder(postDataSourceFactory, pagedListConfig)).build();
         });
@@ -135,7 +135,7 @@ public class PostViewModel extends ViewModel {
         sortTypeLiveData = new MutableLiveData<>();
         sortTypeLiveData.postValue(sortType);
 
-        NSFWAndSortTypeLiveData = new NSFWAndSortTypeLiveData(nsfwLiveData, sortTypeLiveData);
+        nsfwAndSortTypeLiveData = new NSFWAndSortTypeLiveData(nsfwLiveData, sortTypeLiveData);
 
         PagedList.Config pagedListConfig =
                 (new PagedList.Config.Builder())
@@ -143,7 +143,7 @@ public class PostViewModel extends ViewModel {
                         .setPageSize(25)
                         .build();
 
-        posts = Transformations.switchMap(NSFWAndSortTypeLiveData, nsfwAndSort -> {
+        posts = Transformations.switchMap(nsfwAndSortTypeLiveData, nsfwAndSort -> {
             postDataSourceFactory.changeNSFWAndSortType(nsfwLiveData.getValue(), sortTypeLiveData.getValue());
             return (new LivePagedListBuilder(postDataSourceFactory, pagedListConfig)).build();
         });

app/src/main/res/drawable/splash_screen.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android" android:opacity="opaque">
+
+    <item android:drawable="@color/backgroundColor" />
+
+    <item>
+        <bitmap
+            android:src="@drawable/splash_icon"
+            android:gravity="center" />
+    </item>
+
+</layer-list>

app/src/main/res/values-night-v27/styles.xml

@@ -0,0 +1,8 @@
+<resources>
+
+    <style name="AppTheme.Launcher" parent="@style/AppTheme.NoActionBarWithTransparentStatusBar">
+        <item name="android:windowBackground">@drawable/splash_screen</item>
+        <item name="android:navigationBarColor">@color/navBarColor</item>
+    </style>
+
+</resources>

app/src/main/res/values-v27/styles.xml

@@ -0,0 +1,10 @@
+<resources>
+
+    <style name="AppTheme.Launcher" parent="@style/AppTheme.NoActionBarWithTransparentStatusBar">
+        <item name="android:windowBackground">@drawable/splash_screen</item>
+        <item name="android:navigationBarColor">@color/navBarColor</item>
+        <item name="android:windowLightStatusBar">true</item>
+        <item name="android:windowLightNavigationBar">true</item>
+    </style>
+
+</resources>

app/src/main/res/values/styles.xml

@@ -10,6 +10,10 @@
         <item name="android:textColorPrimary">@android:color/white</item>
     </style>
 
+    <style name="AppTheme.Launcher" parent="@style/AppTheme.NoActionBarWithTransparentStatusBar">
+        <item name="android:windowBackground">@drawable/splash_screen</item>
+    </style>
+
     <style name="AppTheme.NoActionBar">
         <item name="windowActionBar">false</item>
         <item name="windowNoTitle">true</item>