Android Studio如何设置layout布局格式

Question

我这里xml的风格怎么设置为Linear layout，我看别人的都是这种。

Answer 1

把最外层默认的constraintLayout替换成Linear layout。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".MainActivity"
    tools:showIn="@layout/activity_main"
    android:background="@drawable/ic_launcher_background"
    android:orientation="vertical">
    <LinearLayout
        android:id="@+id/ll_1"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:orientation="vertical"
        android:background="#090909">
    </LinearLayout>
 
</LinearLayout>