Set the all apps nav bar to black.

        </LinearLayout>

    </com.android.launcher3.allapps.AllAppsRecyclerViewContainerView>

    <View

        android:id="@+id/nav_bar_bg"

        android:layout_width="match_parent"

        android:layout_height="0dp"

        android:layout_gravity="bottom"

        android:background="@android:color/black"

        android:elevation="16dp"

        android:focusable="false"

        android:visibility="invisible" />

</com.android.launcher3.allapps.AllAppsContainerView>

 No newline at end of file

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewConfiguration;

import android.view.ViewGroup;

import android.view.inputmethod.InputMethodManager;

import android.widget.ImageView;

import android.widget.LinearLayout;

                mSearchIcon.setLayoutParams(llp);

                lp.height = height;

                View navBarBg = findViewById(R.id.nav_bar_bg);

                ViewGroup.LayoutParams params = navBarBg.getLayoutParams();

                params.height = insets.bottom;

                navBarBg.setLayoutParams(params);

                navBarBg.setVisibility(View.VISIBLE);

            }

        }

        mSearchContainer.setLayoutParams(lp);