XiaoxintongSystemOS/app/src/main/res/layout/activity_wifi_manager.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/wifi_background_color"
    tools:context=".activity.wifi.WiFiManagerActivity">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/background_wifi">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/constraintLayout12"
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_24"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <ImageView
                android:id="@+id/iv_close"
                android:layout_width="@dimen/dp_16"
                android:layout_height="@dimen/dp_16"
                android:layout_marginStart="@dimen/dp_12"
                android:src="@drawable/icon_close"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="网络设置"
                android:textColor="@color/black"
                android:textSize="@dimen/sp_13"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

        </androidx.constraintlayout.widget.ConstraintLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:orientation="vertical"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/constraintLayout12">

            <androidx.constraintlayout.widget.ConstraintLayout
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1">

                <TextView
                    android:id="@+id/textView20"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginStart="@dimen/dp_12"
                    android:layout_marginTop="@dimen/dp_4"
                    android:layout_marginBottom="@dimen/dp_4"
                    android:text="已保存网络"
                    android:textColor="@color/default_text_color"
                    android:textSize="@dimen/sp_10"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toTopOf="parent" />

                <TextView
                    android:id="@+id/tv_refresh"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginEnd="@dimen/dp_8"
                    android:text="刷新"
                    android:textColor="@color/default_blue"
                    android:textSize="@dimen/sp_10"
                    app:layout_constraintBottom_toBottomOf="@+id/textView20"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintTop_toTopOf="@+id/textView20" />

                <androidx.recyclerview.widget.RecyclerView
                    android:id="@+id/rv_saved"
                    android:layout_width="match_parent"
                    android:layout_height="0dp"
                    android:layout_marginStart="@dimen/dp_12"
                    android:layout_marginTop="@dimen/dp_4"
                    android:layout_marginEnd="@dimen/dp_12"
                    app:layout_constraintBottom_toBottomOf="parent"
                    app:layout_constraintTop_toBottomOf="@+id/textView20"
                    tools:listitem="@layout/item_wifi_info" />

            </androidx.constraintlayout.widget.ConstraintLayout>

            <androidx.constraintlayout.widget.ConstraintLayout
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1">

                <TextView
                    android:id="@+id/textView21"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginStart="@dimen/dp_8"
                    android:layout_marginTop="@dimen/dp_4"
                    android:layout_marginBottom="@dimen/dp_4"
                    android:text="可用网络"
                    android:textColor="@color/default_text_color"
                    android:textSize="@dimen/sp_10"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toTopOf="parent" />

                <TextView
                    android:id="@+id/tv_refresh2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginEnd="@dimen/dp_8"
                    android:text="刷新"
                    android:textColor="@color/default_blue"
                    android:textSize="@dimen/sp_10"
                    app:layout_constraintBottom_toBottomOf="@+id/textView21"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintTop_toTopOf="@+id/textView21" />

                <androidx.recyclerview.widget.RecyclerView
                    android:id="@+id/rv_available"
                    android:layout_width="match_parent"
                    android:layout_height="0dp"
                    android:layout_marginStart="@dimen/dp_12"
                    android:layout_marginTop="@dimen/dp_4"
                    android:layout_marginEnd="@dimen/dp_12"
                    app:layout_constraintBottom_toBottomOf="parent"
                    app:layout_constraintTop_toBottomOf="@+id/textView21" />

            </androidx.constraintlayout.widget.ConstraintLayout>

        </LinearLayout>
    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>