DuduToy/app/src/main/res/layout/dialog_download.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white">

    <TextView
        android:id="@+id/tv_progress_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:padding="20dp"
        android:textColor="@android:color/black"
        android:textSize="30sp"
        tools:text="标题" />

    <View
        android:id="@+id/centerLine"
        android:layout_width="1dp"
        android:layout_height="1dp"
        android:layout_centerInParent="true" />

    <ProgressBar
        android:id="@+id/progress"
        style="?android:progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_below="@+id/tv_progress_title"
        android:layout_margin="20dp"
        android:max="100"
        android:progress="0"
        android:progressDrawable="@android:drawable/progress_horizontal" />

    <Button
        android:id="@+id/btn_cancel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/progress"
        android:layout_toLeftOf="@+id/centerLine"
        android:layout_toStartOf="@+id/centerLine"
        android:text="取消"
        android:textColor="@android:color/white"
        android:textSize="28sp"
        android:visibility="gone"/>

    <Button
        android:id="@+id/btn_submit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/progress"
        android:layout_toEndOf="@+id/centerLine"
        android:layout_toRightOf="@+id/centerLine"
        android:text="安装"
        android:textColor="@android:color/holo_red_light"
        android:textSize="28sp"
        android:visibility="gone"/>
</RelativeLayout>