zhibo/android-app/app/src/main/res/layout/activity_my_friends.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/white">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingStart="16dp"
            android:paddingEnd="16dp"
            android:paddingTop="14dp"
            android:paddingBottom="12dp">

            <ImageView
                android:id="@+id/backButton"
                android:layout_width="24dp"
                android:layout_height="24dp"
                android:contentDescription="back"
                android:src="@drawable/ic_arrow_back_24"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/titleText"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="12dp"
                android:ellipsize="end"
                android:maxLines="1"
                android:text="我的挚友"
                android:textColor="#111111"
                android:textSize="18sp"
                android:textStyle="bold"
                app:layout_constraintBottom_toBottomOf="@id/backButton"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/backButton"
                app:layout_constraintTop_toTopOf="@id/backButton" />

            <androidx.constraintlayout.widget.ConstraintLayout
                android:id="@+id/searchContainer"
                android:layout_width="0dp"
                android:layout_height="40dp"
                android:layout_marginTop="12dp"
                android:background="@drawable/bg_search"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/backButton">

                <ImageView
                    android:id="@+id/searchIcon"
                    android:layout_width="18dp"
                    android:layout_height="18dp"
                    android:layout_marginStart="12dp"
                    android:contentDescription="search"
                    android:src="@drawable/ic_search_24"
                    app:layout_constraintBottom_toBottomOf="parent"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toTopOf="parent" />

                <EditText
                    android:id="@+id/searchEdit"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_marginStart="8dp"
                    android:background="@android:color/transparent"
                    android:hint="搜索挚友"
                    android:inputType="text"
                    android:singleLine="true"
                    android:textColor="#111111"
                    android:textColorHint="#999999"
                    android:textSize="14sp"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintStart_toEndOf="@id/searchIcon"
                    app:layout_constraintTop_toTopOf="parent" />

            </androidx.constraintlayout.widget.ConstraintLayout>

        </androidx.constraintlayout.widget.ConstraintLayout>

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/friendsRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:paddingTop="6dp"
        android:paddingBottom="16dp"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <com.example.livestreaming.EmptyStateView
        android:id="@+id/emptyStateView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>