Android Development Notes 1.0 LinearLayout linear layout

android: id identity

android: id = "@ + id / name" to create an id

android: layout_width width

Width layout_width = "wrap_content" adaptive content: android

android: layout_width = "match_parent" parent matching the width of the space

android: layout_height height

android: layout_height = "520dp" use dp units

android: margin Margin

android: padding padding inside

    android: paddingLeft = within "20dp" left margin

    android: Right margins within paddingRight

    android: padding on paddingTop

    android: padding within the next paddingBottom

android: background background

android: background = "# 000000" black background

android: orientation direction

android: orientation = "vertical" the direction perpendicular to

android: orientation = "horizontal" horizontal direction

<?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"
    tools:context="com.example.administrator.myapplication.MainActivity"
    android:background="#00ff55"
    android:orientation="vertical">

    <LinearLayout
        android:id="@+id/L1"
        android:layout_width="200dp"
        android:layout_height="300dp"
        android:background="#000000"
        android:orientation="vertical"
        android:layout_margin="30dp"
        android:padding="20dp"
        >
        <LinearLayout
            android:id="@+id/L2"

            android:background="#ffffff"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/L3"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="20dp"
        android:background="#ff0000"
        android:orientation="vertical"
        >



    </LinearLayout>

</LinearLayout>

效果图