Implement immersive mode in many other activities.

12 files changed, 420 insertions, 29 deletions

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/CreateMultiRedditActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/CreateMultiRedditActivity.java
index 6db86514..eb9aadfe 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/CreateMultiRedditActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/CreateMultiRedditActivity.java
@@ -2,9 +2,16 @@ package ml.docilealligator.infinityforreddit.Activity;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.os.Build;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.Window;
+import android.view.WindowManager;
 import android.widget.EditText;
 import android.widget.LinearLayout;
 import android.widget.Switch;
@@ -15,7 +22,9 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.widget.Toolbar;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.core.widget.NestedScrollView;
 
+import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.snackbar.Snackbar;
 
 import java.util.ArrayList;
@@ -25,6 +34,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.AppBarStateChangeListener;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.MultiReddit.CreateMultiReddit;
@@ -32,6 +42,7 @@ import ml.docilealligator.infinityforreddit.MultiReddit.MultiRedditJSONModel;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import ml.docilealligator.infinityforreddit.SubredditWithSelection;
+import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import retrofit2.Retrofit;
 
 public class CreateMultiRedditActivity extends BaseActivity {
@@ -44,8 +55,12 @@ public class CreateMultiRedditActivity extends BaseActivity {
     private static final String SELECTED_OTHER_SUBREDDITS_STATE = "SOSS";
     @BindView(R.id.coordinator_layout_create_multi_reddit_activity)
     CoordinatorLayout coordinatorLayout;
+    @BindView(R.id.appbar_layout_create_multi_reddit_activity)
+    AppBarLayout appBarLayout;
     @BindView(R.id.toolbar_create_multi_reddit_activity)
     Toolbar toolbar;
+    @BindView(R.id.nested_scroll_view_create_multi_reddit_activity)
+    NestedScrollView nestedScrollView;
     @BindView(R.id.multi_reddit_name_edit_text_create_multi_reddit_activity)
     EditText nameEditText;
     @BindView(R.id.description_edit_text_create_multi_reddit_activity)
@@ -77,6 +92,54 @@ public class CreateMultiRedditActivity extends BaseActivity {
 
         ButterKnife.bind(this);
 
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+            Resources resources = getResources();
+
+            if ((resources.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT
+                    || resources.getBoolean(R.bool.isTablet))
+                    && mSharedPreferences.getBoolean(SharedPreferencesUtils.IMMERSIVE_INTERFACE_KEY, true)) {
+                Window window = getWindow();
+                window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
+
+                boolean lightNavBar = false;
+                if ((resources.getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) != Configuration.UI_MODE_NIGHT_YES) {
+                    lightNavBar = true;
+                }
+                boolean finalLightNavBar = lightNavBar;
+
+                View decorView = window.getDecorView();
+                if (finalLightNavBar) {
+                    decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                }
+                appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
+                    @Override
+                    public void onStateChanged(AppBarLayout appBarLayout, AppBarStateChangeListener.State state) {
+                        if (state == State.COLLAPSED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR | View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        } else if (state == State.EXPANDED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        }
+                    }
+                });
+
+                int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
+                if (statusBarResourceId > 0) {
+                    ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
+                    params.topMargin = getResources().getDimensionPixelSize(statusBarResourceId);
+                    toolbar.setLayoutParams(params);
+                }
+
+                int navBarResourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
+                if (navBarResourceId > 0) {
+                    nestedScrollView.setPadding(0, 0, 0, resources.getDimensionPixelSize(navBarResourceId));
+                }
+            }
+        }
+
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostImageActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostImageActivity.java
index 93e6ed69..1ce56ba7 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostImageActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostImageActivity.java
@@ -2,6 +2,8 @@ package ml.docilealligator.infinityforreddit.Activity;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.content.res.Resources;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
@@ -10,6 +12,9 @@ import android.provider.MediaStore;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.ViewGroup;
+import android.view.Window;
+import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.ImageView;
@@ -21,10 +26,12 @@ import androidx.appcompat.widget.Toolbar;
 import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.core.content.FileProvider;
+import androidx.core.widget.NestedScrollView;
 
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.RequestManager;
 import com.bumptech.glide.request.RequestOptions;
+import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.snackbar.Snackbar;
@@ -42,6 +49,7 @@ import javax.inject.Named;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import ml.docilealligator.infinityforreddit.AppBarStateChangeListener;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.LoadSubredditIconAsyncTask;
 import ml.docilealligator.infinityforreddit.Event.SubmitImagePostEvent;
@@ -52,6 +60,7 @@ import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import ml.docilealligator.infinityforreddit.Service.SubmitPostService;
+import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
@@ -79,8 +88,12 @@ public class PostImageActivity extends BaseActivity implements FlairBottomSheetF
 
     @BindView(R.id.coordinator_layout_post_image_activity)
     CoordinatorLayout coordinatorLayout;
+    @BindView(R.id.appbar_layout_post_image_activity)
+    AppBarLayout appBarLayout;
     @BindView(R.id.toolbar_post_image_activity)
     Toolbar toolbar;
+    @BindView(R.id.nested_scroll_view_post_image_activity)
+    NestedScrollView nestedScrollView;
     @BindView(R.id.subreddit_icon_gif_image_view_post_image_activity)
     GifImageView iconGifImageView;
     @BindView(R.id.subreddit_name_text_view_post_image_activity)
@@ -148,6 +161,54 @@ public class PostImageActivity extends BaseActivity implements FlairBottomSheetF
 
         EventBus.getDefault().register(this);
 
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+            Resources resources = getResources();
+
+            if ((resources.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT
+                    || resources.getBoolean(R.bool.isTablet))
+                    && mSharedPreferences.getBoolean(SharedPreferencesUtils.IMMERSIVE_INTERFACE_KEY, true)) {
+                Window window = getWindow();
+                window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
+
+                boolean lightNavBar = false;
+                if ((resources.getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) != Configuration.UI_MODE_NIGHT_YES) {
+                    lightNavBar = true;
+                }
+                boolean finalLightNavBar = lightNavBar;
+
+                View decorView = window.getDecorView();
+                if (finalLightNavBar) {
+                    decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                }
+                appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
+                    @Override
+                    public void onStateChanged(AppBarLayout appBarLayout, AppBarStateChangeListener.State state) {
+                        if (state == State.COLLAPSED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR | View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        } else if (state == State.EXPANDED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        }
+                    }
+                });
+
+                int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
+                if (statusBarResourceId > 0) {
+                    ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
+                    params.topMargin = getResources().getDimensionPixelSize(statusBarResourceId);
+                    toolbar.setLayoutParams(params);
+                }
+
+                int navBarResourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
+                if (navBarResourceId > 0) {
+                    nestedScrollView.setPadding(0, 0, 0, resources.getDimensionPixelSize(navBarResourceId));
+                }
+            }
+        }
+
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostLinkActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostLinkActivity.java
index e96cf75e..f40cef5b 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostLinkActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostLinkActivity.java
@@ -2,10 +2,16 @@ package ml.docilealligator.infinityforreddit.Activity;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.os.Build;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.ViewGroup;
+import android.view.Window;
+import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;
@@ -14,10 +20,12 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.widget.Toolbar;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.core.widget.NestedScrollView;
 
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.RequestManager;
 import com.bumptech.glide.request.RequestOptions;
+import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.google.android.material.snackbar.Snackbar;
 import com.libRG.CustomTextView;
@@ -31,6 +39,7 @@ import javax.inject.Named;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import ml.docilealligator.infinityforreddit.AppBarStateChangeListener;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.LoadSubredditIconAsyncTask;
 import ml.docilealligator.infinityforreddit.Event.SubmitTextOrLinkPostEvent;
@@ -40,8 +49,9 @@ import ml.docilealligator.infinityforreddit.Fragment.FlairBottomSheetFragment;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
-import ml.docilealligator.infinityforreddit.Utils.RedditUtils;
 import ml.docilealligator.infinityforreddit.Service.SubmitPostService;
+import ml.docilealligator.infinityforreddit.Utils.RedditUtils;
+import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
@@ -66,8 +76,12 @@ public class PostLinkActivity extends BaseActivity implements FlairBottomSheetFr
 
     @BindView(R.id.coordinator_layout_post_link_activity)
     CoordinatorLayout coordinatorLayout;
+    @BindView(R.id.appbar_layout_post_link_activity)
+    AppBarLayout appBarLayout;
     @BindView(R.id.toolbar_post_link_activity)
     Toolbar toolbar;
+    @BindView(R.id.nested_scroll_view_post_link_activity)
+    NestedScrollView nestedScrollView;
     @BindView(R.id.subreddit_icon_gif_image_view_post_link_activity)
     GifImageView iconGifImageView;
     @BindView(R.id.subreddit_name_text_view_post_link_activity)
@@ -122,6 +136,54 @@ public class PostLinkActivity extends BaseActivity implements FlairBottomSheetFr
 
         EventBus.getDefault().register(this);
 
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+            Resources resources = getResources();
+
+            if ((resources.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT
+                    || resources.getBoolean(R.bool.isTablet))
+                    && mSharedPreferences.getBoolean(SharedPreferencesUtils.IMMERSIVE_INTERFACE_KEY, true)) {
+                Window window = getWindow();
+                window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
+
+                boolean lightNavBar = false;
+                if ((resources.getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) != Configuration.UI_MODE_NIGHT_YES) {
+                    lightNavBar = true;
+                }
+                boolean finalLightNavBar = lightNavBar;
+
+                View decorView = window.getDecorView();
+                if (finalLightNavBar) {
+                    decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                }
+                appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
+                    @Override
+                    public void onStateChanged(AppBarLayout appBarLayout, AppBarStateChangeListener.State state) {
+                        if (state == State.COLLAPSED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR | View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        } else if (state == State.EXPANDED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        }
+                    }
+                });
+
+                int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
+                if (statusBarResourceId > 0) {
+                    ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
+                    params.topMargin = getResources().getDimensionPixelSize(statusBarResourceId);
+                    toolbar.setLayoutParams(params);
+                }
+
+                int navBarResourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
+                if (navBarResourceId > 0) {
+                    nestedScrollView.setPadding(0, 0, 0, resources.getDimensionPixelSize(navBarResourceId));
+                }
+            }
+        }
+
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostTextActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostTextActivity.java
index 10ec3996..a573ad2c 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostTextActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostTextActivity.java
@@ -2,10 +2,16 @@ package ml.docilealligator.infinityforreddit.Activity;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.os.Build;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.ViewGroup;
+import android.view.Window;
+import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;
@@ -14,10 +20,12 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.widget.Toolbar;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.core.widget.NestedScrollView;
 
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.RequestManager;
 import com.bumptech.glide.request.RequestOptions;
+import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.google.android.material.snackbar.Snackbar;
 import com.libRG.CustomTextView;
@@ -31,6 +39,7 @@ import javax.inject.Named;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import ml.docilealligator.infinityforreddit.AppBarStateChangeListener;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.LoadSubredditIconAsyncTask;
 import ml.docilealligator.infinityforreddit.Event.SubmitTextOrLinkPostEvent;
@@ -40,8 +49,9 @@ import ml.docilealligator.infinityforreddit.Fragment.FlairBottomSheetFragment;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
-import ml.docilealligator.infinityforreddit.Utils.RedditUtils;
 import ml.docilealligator.infinityforreddit.Service.SubmitPostService;
+import ml.docilealligator.infinityforreddit.Utils.RedditUtils;
+import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
@@ -66,8 +76,12 @@ public class PostTextActivity extends BaseActivity implements FlairBottomSheetFr
 
     @BindView(R.id.coordinator_layout_post_text_activity)
     CoordinatorLayout coordinatorLayout;
+    @BindView(R.id.appbar_layout_post_text_activity)
+    AppBarLayout appBarLayout;
     @BindView(R.id.toolbar_post_text_activity)
     Toolbar toolbar;
+    @BindView(R.id.nested_scroll_view_post_text_activity)
+    NestedScrollView nestedScrollView;
     @BindView(R.id.subreddit_icon_gif_image_view_search_activity)
     GifImageView iconGifImageView;
     @BindView(R.id.subreddit_name_text_view_search_activity)
@@ -122,6 +136,54 @@ public class PostTextActivity extends BaseActivity implements FlairBottomSheetFr
 
         EventBus.getDefault().register(this);
 
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+            Resources resources = getResources();
+
+            if ((resources.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT
+                    || resources.getBoolean(R.bool.isTablet))
+                    && mSharedPreferences.getBoolean(SharedPreferencesUtils.IMMERSIVE_INTERFACE_KEY, true)) {
+                Window window = getWindow();
+                window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
+
+                boolean lightNavBar = false;
+                if ((resources.getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) != Configuration.UI_MODE_NIGHT_YES) {
+                    lightNavBar = true;
+                }
+                boolean finalLightNavBar = lightNavBar;
+
+                View decorView = window.getDecorView();
+                if (finalLightNavBar) {
+                    decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                }
+                appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
+                    @Override
+                    public void onStateChanged(AppBarLayout appBarLayout, AppBarStateChangeListener.State state) {
+                        if (state == State.COLLAPSED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR | View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        } else if (state == State.EXPANDED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        }
+                    }
+                });
+
+                int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
+                if (statusBarResourceId > 0) {
+                    ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
+                    params.topMargin = getResources().getDimensionPixelSize(statusBarResourceId);
+                    toolbar.setLayoutParams(params);
+                }
+
+                int navBarResourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
+                if (navBarResourceId > 0) {
+                    nestedScrollView.setPadding(0, 0, 0, resources.getDimensionPixelSize(navBarResourceId));
+                }
+            }
+        }
+
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostVideoActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostVideoActivity.java
index 2fb18a16..9cea631d 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostVideoActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/PostVideoActivity.java
@@ -2,6 +2,8 @@ package ml.docilealligator.infinityforreddit.Activity;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.content.res.Resources;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
@@ -9,6 +11,9 @@ import android.provider.MediaStore;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.ViewGroup;
+import android.view.Window;
+import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;
@@ -18,6 +23,7 @@ import androidx.annotation.Nullable;
 import androidx.appcompat.widget.Toolbar;
 import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.core.widget.NestedScrollView;
 
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.RequestManager;
@@ -30,6 +36,7 @@ import com.google.android.exoplayer2.ui.PlayerView;
 import com.google.android.exoplayer2.upstream.DataSource;
 import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
 import com.google.android.exoplayer2.util.Util;
+import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.snackbar.Snackbar;
@@ -44,6 +51,7 @@ import javax.inject.Named;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import ml.docilealligator.infinityforreddit.AppBarStateChangeListener;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.LoadSubredditIconAsyncTask;
 import ml.docilealligator.infinityforreddit.Event.SubmitVideoPostEvent;
@@ -54,6 +62,7 @@ import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import ml.docilealligator.infinityforreddit.Service.SubmitPostService;
+import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
@@ -81,8 +90,12 @@ public class PostVideoActivity extends BaseActivity implements FlairBottomSheetF
 
     @BindView(R.id.coordinator_layout_post_video_activity)
     CoordinatorLayout coordinatorLayout;
+    @BindView(R.id.appbar_layout_post_video_activity)
+    AppBarLayout appBarLayout;
     @BindView(R.id.toolbar_post_video_activity)
     Toolbar toolbar;
+    @BindView(R.id.nested_scroll_view_post_video_activity)
+    NestedScrollView nestedScrollView;
     @BindView(R.id.subreddit_icon_gif_image_view_post_video_activity)
     GifImageView iconGifImageView;
     @BindView(R.id.subreddit_name_text_view_post_video_activity)
@@ -156,6 +169,54 @@ public class PostVideoActivity extends BaseActivity implements FlairBottomSheetF
 
         EventBus.getDefault().register(this);
 
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+            Resources resources = getResources();
+
+            if ((resources.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT
+                    || resources.getBoolean(R.bool.isTablet))
+                    && mSharedPreferences.getBoolean(SharedPreferencesUtils.IMMERSIVE_INTERFACE_KEY, true)) {
+                Window window = getWindow();
+                window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
+
+                boolean lightNavBar = false;
+                if ((resources.getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) != Configuration.UI_MODE_NIGHT_YES) {
+                    lightNavBar = true;
+                }
+                boolean finalLightNavBar = lightNavBar;
+
+                View decorView = window.getDecorView();
+                if (finalLightNavBar) {
+                    decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                }
+                appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
+                    @Override
+                    public void onStateChanged(AppBarLayout appBarLayout, AppBarStateChangeListener.State state) {
+                        if (state == State.COLLAPSED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR | View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        } else if (state == State.EXPANDED) {
+                            if (finalLightNavBar) {
+                                decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
+                            }
+                        }
+                    }
+                });
+
+                int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
+                if (statusBarResourceId > 0) {
+                    ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
+                    params.topMargin = getResources().getDimensionPixelSize(statusBarResourceId);
+                    toolbar.setLayoutParams(params);
+                }
+
+                int navBarResourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
+                if (navBarResourceId > 0) {
+                    nestedScrollView.setPadding(0, 0, 0, resources.getDimensionPixelSize(navBarResourceId));
+                }
+            }
+        }
+
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SettingsActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SettingsActivity.java
index d36a72aa..c18ecf68 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SettingsActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SettingsActivity.java
@@ -51,6 +51,7 @@ public class SettingsActivity extends BaseActivity implements
         } else {
             setTitle(savedInstanceState.getCharSequence(TITLE_STATE));
         }
+
         getSupportFragmentManager().addOnBackStackChangedListener(() -> {
             if (getSupportFragmentManager().getBackStackEntryCount() == 0) {
                 setTitle(R.string.settings_activity_label);
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SubredditMultiselectionActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SubredditMultiselectionActivity.java
index 87b45f3c..f326f320 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SubredditMultiselectionActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SubredditMultiselectionActivity.java
@@ -97,7 +97,7 @@ public class SubredditMultiselectionActivity extends BaseActivity {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
             Resources resources = getResources();
 
-            if (resources.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT || resources.getBoolean(R.bool.isTablet)
+            if ((resources.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT || resources.getBoolean(R.bool.isTablet))
                     && mSharedPreferences.getBoolean(SharedPreferencesUtils.IMMERSIVE_INTERFACE_KEY, true)) {
                 Window window = getWindow();
                 window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
diff --git a/app/src/main/res/layout/activity_create_multi_reddit.xml b/app/src/main/res/layout/activity_create_multi_reddit.xml
index c35b8bf4..24c69355 100644
--- a/app/src/main/res/layout/activity_create_multi_reddit.xml
+++ b/app/src/main/res/layout/activity_create_multi_reddit.xml
@@ -8,23 +8,37 @@
     tools:context=".Activity.CreateMultiRedditActivity">
 
     <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appbar_layout_create_multi_reddit_activity"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="?attr/toolbarAndTabBackgroundColor"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <androidx.appcompat.widget.Toolbar
-            android:id="@+id/toolbar_create_multi_reddit_activity"
+        <com.google.android.material.appbar.CollapsingToolbarLayout
             android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            app:popupTheme="@style/AppTheme.PopupOverlay"
-            app:navigationIcon="?attr/homeAsUpIndicator" />
+            android:layout_height="match_parent"
+            app:layout_scrollFlags="scroll|enterAlways"
+            app:titleEnabled="false"
+            app:toolbarId="@+id/toolbar_subscribed_subreddits_multiselection_activity">
+
+            <androidx.appcompat.widget.Toolbar
+                android:id="@+id/toolbar_create_multi_reddit_activity"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:layout_collapseMode="pin"
+                app:layout_scrollFlags="scroll|enterAlways"
+                app:popupTheme="@style/AppTheme.PopupOverlay"
+                app:navigationIcon="?attr/homeAsUpIndicator" />
+
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
 
     </com.google.android.material.appbar.AppBarLayout>
 
     <androidx.core.widget.NestedScrollView
+        android:id="@+id/nested_scroll_view_create_multi_reddit_activity"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:clipToPadding="false"
         app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
         <LinearLayout
@@ -41,7 +55,13 @@
                 android:inputType="textMultiLine"
                 android:textSize="?attr/font_default"
                 android:background="#00000000"
-                android:textColor="@color/primaryTextColor" />
+                android:textColor="@color/primaryTextColor"
+                android:maxLength="50" />
+
+            <View
+                android:layout_width="match_parent"
+                android:layout_height="1dp"
+                android:background="@color/dividerColor" />
 
             <EditText
                 android:id="@+id/description_edit_text_create_multi_reddit_activity"
@@ -54,6 +74,11 @@
                 android:background="#00000000"
                 android:textColor="@color/primaryTextColor" />
 
+            <View
+                android:layout_width="match_parent"
+                android:layout_height="1dp"
+                android:background="@color/dividerColor" />
+
             <LinearLayout
                 android:id="@+id/visibility_wrapper_linear_layout_create_multi_reddit_activity"
                 android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/activity_post_image.xml b/app/src/main/res/layout/activity_post_image.xml
index 9c320679..c4de4f85 100644
--- a/app/src/main/res/layout/activity_post_image.xml
+++ b/app/src/main/res/layout/activity_post_image.xml
@@ -9,23 +9,37 @@
     tools:application=".PostImageActivity">
 
     <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appbar_layout_post_image_activity"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="?attr/toolbarAndTabBackgroundColor"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <androidx.appcompat.widget.Toolbar
-            android:id="@+id/toolbar_post_image_activity"
+        <com.google.android.material.appbar.CollapsingToolbarLayout
             android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            app:popupTheme="@style/AppTheme.PopupOverlay"
-            app:navigationIcon="?attr/homeAsUpIndicator" />
+            android:layout_height="match_parent"
+            app:layout_scrollFlags="scroll|enterAlways"
+            app:titleEnabled="false"
+            app:toolbarId="@+id/toolbar_subscribed_subreddits_multiselection_activity">
+
+            <androidx.appcompat.widget.Toolbar
+                android:id="@+id/toolbar_post_image_activity"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:layout_collapseMode="pin"
+                app:layout_scrollFlags="scroll|enterAlways"
+                app:popupTheme="@style/AppTheme.PopupOverlay"
+                app:navigationIcon="?attr/homeAsUpIndicator" />
+
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
 
     </com.google.android.material.appbar.AppBarLayout>
 
     <androidx.core.widget.NestedScrollView
+        android:id="@+id/nested_scroll_view_post_image_activity"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:clipToPadding="false"
         app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
         <LinearLayout
diff --git a/app/src/main/res/layout/activity_post_link.xml b/app/src/main/res/layout/activity_post_link.xml
index 24ba75b6..acaae587 100644
--- a/app/src/main/res/layout/activity_post_link.xml
+++ b/app/src/main/res/layout/activity_post_link.xml
@@ -9,23 +9,37 @@
     tools:application=".PostTextActivity">
 
     <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appbar_layout_post_link_activity"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="?attr/toolbarAndTabBackgroundColor"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <androidx.appcompat.widget.Toolbar
-            android:id="@+id/toolbar_post_link_activity"
+        <com.google.android.material.appbar.CollapsingToolbarLayout
             android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            app:popupTheme="@style/AppTheme.PopupOverlay"
-            app:navigationIcon="?attr/homeAsUpIndicator" />
+            android:layout_height="match_parent"
+            app:layout_scrollFlags="scroll|enterAlways"
+            app:titleEnabled="false"
+            app:toolbarId="@+id/toolbar_subscribed_subreddits_multiselection_activity">
+
+            <androidx.appcompat.widget.Toolbar
+                android:id="@+id/toolbar_post_link_activity"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:layout_collapseMode="pin"
+                app:layout_scrollFlags="scroll|enterAlways"
+                app:popupTheme="@style/AppTheme.PopupOverlay"
+                app:navigationIcon="?attr/homeAsUpIndicator" />
+
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
 
     </com.google.android.material.appbar.AppBarLayout>
 
     <androidx.core.widget.NestedScrollView
+        android:id="@+id/nested_scroll_view_post_link_activity"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:clipToPadding="false"
         app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
         <LinearLayout
diff --git a/app/src/main/res/layout/activity_post_text.xml b/app/src/main/res/layout/activity_post_text.xml
index 7cabdf0b..98dc7113 100644
--- a/app/src/main/res/layout/activity_post_text.xml
+++ b/app/src/main/res/layout/activity_post_text.xml
@@ -9,23 +9,37 @@
     tools:application=".PostTextActivity">
 
     <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appbar_layout_post_text_activity"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="?attr/toolbarAndTabBackgroundColor"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <androidx.appcompat.widget.Toolbar
-            android:id="@+id/toolbar_post_text_activity"
+        <com.google.android.material.appbar.CollapsingToolbarLayout
             android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            app:popupTheme="@style/AppTheme.PopupOverlay"
-            app:navigationIcon="?attr/homeAsUpIndicator" />
+            android:layout_height="match_parent"
+            app:layout_scrollFlags="scroll|enterAlways"
+            app:titleEnabled="false"
+            app:toolbarId="@+id/toolbar_subscribed_subreddits_multiselection_activity">
+
+            <androidx.appcompat.widget.Toolbar
+                android:id="@+id/toolbar_post_text_activity"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:layout_collapseMode="pin"
+                app:layout_scrollFlags="scroll|enterAlways"
+                app:popupTheme="@style/AppTheme.PopupOverlay"
+                app:navigationIcon="?attr/homeAsUpIndicator" />
+
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
 
     </com.google.android.material.appbar.AppBarLayout>
 
     <androidx.core.widget.NestedScrollView
+        android:id="@+id/nested_scroll_view_post_text_activity"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:clipToPadding="false"
         app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
         <LinearLayout
diff --git a/app/src/main/res/layout/activity_post_video.xml b/app/src/main/res/layout/activity_post_video.xml
index 2e3057d5..f5e4371f 100644
--- a/app/src/main/res/layout/activity_post_video.xml
+++ b/app/src/main/res/layout/activity_post_video.xml
@@ -9,23 +9,37 @@
     tools:application=".PostImageActivity">
 
     <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appbar_layout_post_video_activity"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="?attr/toolbarAndTabBackgroundColor"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <androidx.appcompat.widget.Toolbar
-            android:id="@+id/toolbar_post_video_activity"
+        <com.google.android.material.appbar.CollapsingToolbarLayout
             android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            app:popupTheme="@style/AppTheme.PopupOverlay"
-            app:navigationIcon="?attr/homeAsUpIndicator" />
+            android:layout_height="match_parent"
+            app:layout_scrollFlags="scroll|enterAlways"
+            app:titleEnabled="false"
+            app:toolbarId="@+id/toolbar_subscribed_subreddits_multiselection_activity">
+
+            <androidx.appcompat.widget.Toolbar
+                android:id="@+id/toolbar_post_video_activity"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:layout_collapseMode="pin"
+                app:layout_scrollFlags="scroll|enterAlways"
+                app:popupTheme="@style/AppTheme.PopupOverlay"
+                app:navigationIcon="?attr/homeAsUpIndicator" />
+
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
 
     </com.google.android.material.appbar.AppBarLayout>
 
     <androidx.core.widget.NestedScrollView
+        android:id="@+id/nested_scroll_view_post_video_activity"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:clipToPadding="false"
         app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
         <LinearLayout