AppBarLayout scrolling awesomeness, PlayQueue layout touches interception, player's controls' margin

- made scrolling in appBarLayout awesome
- PlayQueue layout was intercepting touches while it was in GONE visibility state. Now it's not gonna happen
- removed margin between two lines of player's controls
- when a user leaves the app with two back presses the app will not stop MainPlayer service if popup or background players play

app/src/main/java/com/google/android/material/appbar/FlingBehavior.java

@@ -23,14 +23,14 @@ public final class FlingBehavior extends AppBarLayout.Behavior {
     }
 
     private boolean allowScroll = true;
-    private Rect playQueueRect = new Rect();
+    private Rect globalRect = new Rect();
 
     @Override
     public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) {
-        ViewGroup playQueue = child.findViewById(R.id.playQueue);
+        ViewGroup playQueue = child.findViewById(R.id.playQueuePanel);
         if (playQueue != null) {
-            playQueue.getGlobalVisibleRect(playQueueRect);
+            boolean visible = playQueue.getGlobalVisibleRect(globalRect);
-            if (playQueueRect.contains((int) ev.getRawX(), (int) ev.getRawY())) {
+            if (visible && globalRect.contains((int) ev.getRawX(), (int) ev.getRawY())) {
                 allowScroll = false;
                 return false;
             }

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -403,8 +403,9 @@ public class VideoDetailFragment
     public void onDestroy() {
         super.onDestroy();
 
-        if (!activity.isFinishing()) unbind();
+        // Stop the service when user leaves the app with double back press if video player is selected. Otherwise unbind
-        else stopService();
+        if (activity.isFinishing() && player != null && player.videoPlayerSelected()) stopService();
+        else unbind();
 
         PreferenceManager.getDefaultSharedPreferences(activity)
                 .unregisterOnSharedPreferenceChangeListener(this);

app/src/main/java/org/schabi/newpipe/player/VideoPlayerImpl.java

@@ -306,6 +306,7 @@ public class VideoPlayerImpl extends VideoPlayer
             playerCloseButton.setVisibility(View.GONE);
             getTopControlsRoot().bringToFront();
             getBottomControlsRoot().bringToFront();
+            onQueueClosed();
         } else {
             fullscreenButton.setVisibility(View.GONE);
             setupScreenRotationButton(service.isLandscape());
@@ -678,7 +679,10 @@ public class VideoPlayerImpl extends VideoPlayer
 
     private void onQueueClosed() {
         animateView(queueLayout, SLIDE_AND_ALPHA, /*visible=*/false,
-                DEFAULT_CONTROLS_DURATION);
+                DEFAULT_CONTROLS_DURATION, 0, () -> {
+                    // Even when queueLayout is GONE it receives touch events and ruins normal behavior of the app. This line fixes it
+                    queueLayout.setTranslationY(-queueLayout.getHeight() * 5);
+                });
         queueVisible = false;
     }
 

app/src/main/java/org/schabi/newpipe/player/event/CustomBottomSheetBehavior.java

@@ -4,62 +4,47 @@ import android.content.Context;
 import android.graphics.Rect;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
-import android.view.View;
 import android.view.ViewGroup;
+import android.widget.FrameLayout;
+import androidx.annotation.NonNull;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import com.google.android.material.bottomsheet.BottomSheetBehavior;
 import org.schabi.newpipe.R;
 
-public class CustomBottomSheetBehavior extends BottomSheetBehavior {
+import java.util.Arrays;
+import java.util.List;
+
+public class CustomBottomSheetBehavior extends BottomSheetBehavior<FrameLayout> {
 
     public CustomBottomSheetBehavior(Context context, AttributeSet attrs) {
         super(context, attrs);
     }
 
-    boolean skippingInterception = false;
+    boolean visible;
+    Rect globalRect = new Rect();
+    private boolean skippingInterception = false;
+    private List<Integer> skipInterceptionOfElements = Arrays.asList(
+            R.id.detail_content_root_layout, R.id.relatedStreamsLayout, R.id.playQueuePanel, R.id.viewpager);
 
     @Override
-    public boolean onInterceptTouchEvent(CoordinatorLayout parent, View child, MotionEvent event) {
+    public boolean onInterceptTouchEvent(@NonNull CoordinatorLayout parent, @NonNull FrameLayout child, MotionEvent event) {
-        // Behavior of globalVisibleRect is different on different APIs.
+        // Drop following when action ends
-        // For example, on API 19 getGlobalVisibleRect returns a filled rect of a collapsed view while on the latest API
-        // it returns empty rect in that case. So check visibility with return value too
-        boolean visible;
-        Rect rect = new Rect();
-
-        // Drop folowing when actions ends
         if (event.getAction() == MotionEvent.ACTION_CANCEL || event.getAction() == MotionEvent.ACTION_UP)
             skippingInterception = false;
 
-        // Found that user still swipping, continue folowing
+        // Found that user still swiping, continue following
         if (skippingInterception) return false;
 
-        // Without overriding scrolling will not work in detail_content_root_layout
+        // Without overriding scrolling will not work when user touches these elements
-        ViewGroup controls = child.findViewById(R.id.detail_content_root_layout);
+        for (Integer element : skipInterceptionOfElements) {
-        if (controls != null) {
+            ViewGroup viewGroup = child.findViewById(element);
-            visible = controls.getGlobalVisibleRect(rect);
+            if (viewGroup != null) {
-            if (rect.contains((int) event.getRawX(), (int) event.getRawY()) && visible) {
+                visible = viewGroup.getGlobalVisibleRect(globalRect);
+                if (visible && globalRect.contains((int) event.getRawX(), (int) event.getRawY())) {
                     skippingInterception = true;
                     return false;
                 }
             }
-
-        // Without overriding scrolling will not work on relatedStreamsLayout
-        ViewGroup relatedStreamsLayout = child.findViewById(R.id.relatedStreamsLayout);
-        if (relatedStreamsLayout != null) {
-            visible = relatedStreamsLayout.getGlobalVisibleRect(rect);
-            if (rect.contains((int) event.getRawX(), (int) event.getRawY()) && visible) {
-                skippingInterception = true;
-                return false;
-            }
-        }
-
-        ViewGroup playQueue = child.findViewById(R.id.playQueue);
-        if (playQueue != null) {
-            visible = playQueue.getGlobalVisibleRect(rect);
-            if (rect.contains((int) event.getRawX(), (int) event.getRawY()) && visible) {
-                skippingInterception = true;
-                return false;
-            }
         }
 
         return super.onInterceptTouchEvent(parent, child, event);

app/src/main/res/layout-large-land/activity_main_player.xml

@@ -157,7 +157,6 @@
                 android:minHeight="50dp"
                 android:baselineAligned="false"
                 android:gravity="top"
-                android:layout_marginBottom="7dp"
                 tools:ignore="RtlHardcoded">
 
                 <ImageButton

app/src/main/res/layout-large-land/fragment_video_detail.xml

@@ -22,30 +22,6 @@
 		android:layout_weight="5"
 		android:fitsSystemWindows="true">
 
-		<androidx.core.widget.NestedScrollView
-				android:layout_width="match_parent"
-				android:layout_height="match_parent"
-				app:layout_behavior="@string/appbar_scrolling_view_behavior"
-				android:fillViewport="true">
-
-			<androidx.viewpager.widget.ViewPager
-					android:id="@+id/viewpager"
-					android:layout_width="match_parent"
-					android:layout_height="match_parent" >
-
-				<com.google.android.material.tabs.TabLayout
-						android:id="@+id/tablayout"
-						android:layout_width="match_parent"
-						android:layout_height="30dp"
-						android:layout_gravity="bottom|center"
-						app:tabBackground="@drawable/tab_selector"
-						app:tabGravity="center"
-						app:tabIndicatorHeight="0dp"/>
-
-			</androidx.viewpager.widget.ViewPager>
-
-		</androidx.core.widget.NestedScrollView>
-
 		<com.google.android.material.appbar.AppBarLayout
 			android:id="@+id/appbarlayout"
 			android:layout_width="match_parent"
@@ -541,6 +517,23 @@
 
 		</com.google.android.material.appbar.AppBarLayout>
 
+		<androidx.viewpager.widget.ViewPager
+			android:id="@+id/viewpager"
+			android:layout_width="match_parent"
+			android:layout_height="match_parent"
+			app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+			<com.google.android.material.tabs.TabLayout
+				android:id="@+id/tablayout"
+				android:layout_width="match_parent"
+				android:layout_height="30dp"
+				android:layout_gravity="bottom|center"
+				app:tabBackground="@drawable/tab_selector"
+				app:tabGravity="center"
+				app:tabIndicatorHeight="0dp"/>
+
+		</androidx.viewpager.widget.ViewPager>
+
 	</androidx.coordinatorlayout.widget.CoordinatorLayout>
 
 	<FrameLayout

app/src/main/res/layout/activity_main_player.xml

@@ -155,7 +155,6 @@
                 android:minHeight="50dp"
                 android:baselineAligned="false"
                 android:gravity="top"
-                android:layout_marginBottom="7dp"
                 tools:ignore="RtlHardcoded">
 
                 <ImageButton

app/src/main/res/layout/fragment_video_detail.xml

@@ -13,37 +13,6 @@
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content">
 
-		<!--
-		You may wonder why this NestedScrollView locates on top of the file. That's because BottomSheetBehavior
-		can work well only with one element that implements nested scrolling. But we have two:
-		one NestedScrollView for ViewPager with id = viewpager here
-		second ViewPager with id = playQueue inside activity_main_player.xml.
-		By placing this NestedScrollView on top of the file we are getting this ViewPager working -->
-
-		<androidx.core.widget.NestedScrollView
-				android:layout_width="match_parent"
-				android:layout_height="match_parent"
-				app:layout_behavior="@string/appbar_scrolling_view_behavior"
-				android:fillViewport="true">
-
-			<androidx.viewpager.widget.ViewPager
-					android:id="@+id/viewpager"
-					android:layout_width="match_parent"
-					android:layout_height="match_parent" >
-
-				<com.google.android.material.tabs.TabLayout
-						android:id="@+id/tablayout"
-						android:layout_width="match_parent"
-						android:layout_height="30dp"
-						android:layout_gravity="bottom|center"
-						app:tabBackground="@drawable/tab_selector"
-						app:tabGravity="center"
-						app:tabIndicatorHeight="0dp"/>
-
-			</androidx.viewpager.widget.ViewPager>
-
-		</androidx.core.widget.NestedScrollView>
-
 		<com.google.android.material.appbar.AppBarLayout
 			android:id="@+id/appbarlayout"
 			android:layout_width="match_parent"
@@ -541,6 +510,23 @@
 
 		</com.google.android.material.appbar.AppBarLayout>
 
+		<androidx.viewpager.widget.ViewPager
+			android:id="@+id/viewpager"
+			android:layout_width="match_parent"
+			android:layout_height="match_parent"
+			app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+			<com.google.android.material.tabs.TabLayout
+				android:id="@+id/tablayout"
+				android:layout_width="match_parent"
+				android:layout_height="30dp"
+				android:layout_gravity="bottom|center"
+				app:tabBackground="@drawable/tab_selector"
+				app:tabGravity="center"
+				app:tabIndicatorHeight="0dp"/>
+
+		</androidx.viewpager.widget.ViewPager>
+
 	</androidx.coordinatorlayout.widget.CoordinatorLayout>
 
 	<RelativeLayout