Fix bottom nav sometimes not hide correctly

Replace homemade animation with StateListAnimator

app/src/main/java/com/topjohnwu/magisk/ui/MainActivity.kt

@@ -11,6 +11,7 @@ import android.view.View
 import android.view.WindowManager
 import androidx.core.content.pm.ShortcutManagerCompat
 import androidx.core.view.forEach
+import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.interpolator.view.animation.FastOutLinearInInterpolator
 import androidx.interpolator.view.animation.LinearOutSlowInInterpolator
@@ -97,10 +98,8 @@ class MainActivity : BaseMainActivity<MainViewModel, ActivityMainMd2Binding>() {
 
         getScreen(section)?.navigate()
 
-        if (savedInstanceState != null) {
-            if (!isRootFragment) {
-                requestNavigationHidden()
-            }
+        if (!isRootFragment) {
+            requestNavigationHidden(requiresAnimation = savedInstanceState == null)
         }
     }
 
@@ -120,45 +119,13 @@ class MainActivity : BaseMainActivity<MainViewModel, ActivityMainMd2Binding>() {
         }
     }
 
-    @Suppress("UNCHECKED_CAST")
-    internal fun requestNavigationHidden(hide: Boolean = true) {
+    internal fun requestNavigationHidden(hide: Boolean = true, requiresAnimation: Boolean = true) {
         val bottomView = binding.mainNavigation
-
-        // A copy of HideBottomViewOnScrollBehavior's animation
-
-        fun animateTranslationY(
-            view: View, targetY: Int, duration: Long, interpolator: TimeInterpolator
-        ) {
-            view.tag = view
-                .animate()
-                .translationY(targetY.toFloat())
-                .setInterpolator(interpolator)
-                .setDuration(duration)
-                .setListener(
-                    object : AnimatorListenerAdapter() {
-                        override fun onAnimationEnd(animation: Animator) {
-                            view.tag = null
-                        }
-                    })
-        }
-
-        (bottomView.tag as? Animator)?.cancel()
-        bottomView.clearAnimation()
-
-        if (hide) {
-            animateTranslationY(
-                bottomView,
-                bottomView.measuredHeight,
-                175L,
-                FastOutLinearInInterpolator()
-            )
+        if (requiresAnimation) {
+            bottomView.isVisible = true
+            bottomView.isHidden = hide
         } else {
-            animateTranslationY(
-                bottomView,
-                0,
-                225L,
-                LinearOutSlowInInterpolator()
-            )
+            bottomView.isGone = hide
         }
     }
 

app/src/main/java/com/topjohnwu/magisk/widget/ConcealableBottomNavigationView.java

@@ -0,0 +1,136 @@
+package com.topjohnwu.magisk.widget;
+
+import android.animation.Animator;
+import android.animation.ObjectAnimator;
+import android.animation.StateListAnimator;
+import android.content.Context;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.util.AttributeSet;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.interpolator.view.animation.FastOutLinearInInterpolator;
+
+import com.google.android.material.bottomnavigation.BottomNavigationView;
+import com.topjohnwu.magisk.R;
+
+public class ConcealableBottomNavigationView extends BottomNavigationView {
+
+    private static final int[] STATE_SET = {
+            R.attr.state_hidden
+    };
+
+    private boolean isHidden;
+
+    public ConcealableBottomNavigationView(@NonNull Context context) {
+        this(context, null);
+    }
+
+    public ConcealableBottomNavigationView(@NonNull Context context, @Nullable AttributeSet attrs) {
+        this(context, attrs, R.attr.bottomNavigationStyle);
+    }
+
+    public ConcealableBottomNavigationView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+        this(context, attrs, defStyleAttr, R.style.Widget_Design_BottomNavigationView);
+    }
+
+    public ConcealableBottomNavigationView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    private void recreateAnimator(int height) {
+        Animator toHidden = ObjectAnimator.ofFloat(this, "translationY", height);
+        toHidden.setDuration(175);
+        toHidden.setInterpolator(new FastOutLinearInInterpolator());
+        Animator toUnhidden = ObjectAnimator.ofFloat(this, "translationY", 0);
+        toHidden.setDuration(225);
+        toHidden.setInterpolator(new FastOutLinearInInterpolator());
+
+        StateListAnimator animator = new StateListAnimator();
+
+        animator.addState(STATE_SET, toHidden);
+        animator.addState(new int[]{}, toUnhidden);
+
+        setStateListAnimator(animator);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+
+        recreateAnimator(getMeasuredHeight());
+    }
+
+    @Override
+    protected int[] onCreateDrawableState(int extraSpace) {
+        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
+        if (isHidden()) {
+            mergeDrawableStates(drawableState, STATE_SET);
+        }
+        return drawableState;
+    }
+
+    public boolean isHidden() {
+        return isHidden;
+    }
+
+    public void setHidden(boolean raised) {
+        if (isHidden != raised) {
+            isHidden = raised;
+            refreshDrawableState();
+        }
+    }
+
+    @NonNull
+    @Override
+    protected Parcelable onSaveInstanceState() {
+        SavedState state = new SavedState(super.onSaveInstanceState());
+        state.isHidden = isHidden();
+        return state;
+    }
+
+    @Override
+    protected void onRestoreInstanceState(Parcelable state) {
+        final SavedState ss = (SavedState) state;
+        super.onRestoreInstanceState(ss.getSuperState());
+
+        if (ss.isHidden) {
+            setHidden(isHidden);
+        }
+    }
+
+    static class SavedState extends View.BaseSavedState {
+
+        public boolean isHidden;
+
+        public SavedState(Parcel source) {
+            super(source);
+            isHidden = source.readByte() != 0;
+        }
+
+        public SavedState(Parcelable superState) {
+            super(superState);
+        }
+
+        @Override
+        public void writeToParcel(Parcel out, int flags) {
+            super.writeToParcel(out, flags);
+            out.writeByte(isHidden ? (byte) 1 : (byte) 0);
+        }
+
+        public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
+
+            @Override
+            public SavedState createFromParcel(Parcel source) {
+                return new SavedState(source);
+            }
+
+            @Override
+            public SavedState[] newArray(int size) {
+                return new SavedState[size];
+            }
+        };
+    }
+}

app/src/main/res/layout/activity_main_md2.xml

@@ -48,7 +48,7 @@
 
         </com.google.android.material.appbar.AppBarLayout>
 
-        <com.google.android.material.bottomnavigation.BottomNavigationView
+        <com.topjohnwu.magisk.widget.ConcealableBottomNavigationView
             android:id="@+id/main_navigation"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"

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

@@ -47,4 +47,8 @@
         </attr>
     </declare-styleable>
 
+    <declare-styleable name="ConcealableView">
+        <attr name="state_hidden" format="boolean" />
+    </declare-styleable>
+
 </resources>