看的是天哥的安卓学习视频，下面是笔记

· 完整项目最精简流程：Android <-->接口<-->数据库，

1.线性布局 LinearLayout

<?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"      android:orientation="vertical"      tools:context=".MainActivity">      <LinearLayout        android:id="@+id/ll_1"        android:layout_width="200dp"        android:layout_height="200dp"        android:orientation="vertical"        android:background="#AA55AA"        android:paddingLeft="20dp"        android:paddingRight="20dp"        android:paddingBottom="50dp"        android:paddingTop="100dp"        android:layout_marginBottom="20dp"        >          <View            android:layout_width="match_parent"            android:layout_height="match_parent"            android:background="#B34D4D"            />    </LinearLayout>        <LinearLayout            android:layout_width="match_parent"          android:layout_height="200dp"          android:orientation="horizontal"          android:background="#E1B8B8"          android:layout_marginTop="10dp"        >          <View              android:layout_width="0dp"              android:layout_height="match_parent"              android:background="#B34D4D"              android:layout_weight="1"              />          <View              android:layout_width="0dp"              android:layout_height="match_parent"              android:background="#B4E4E4"              android:layout_weight="1"              />      </LinearLayout>  </LinearLayout>

2.相对布局 relativeLayout：下面的代码中也嵌套着线性布局，并且在线性布局中还嵌套着相对布局

<?xml version="1.0" encoding="utf-8"?>  <RelativeLayout 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"     >      <View          android:id="@+id/view_1"          android:layout_width="100dp"          android:layout_height="100dp"          android:background="#C7B1E7"/>      <View          android:id="@+id/view_2"          android:layout_width="100dp"          android:layout_height="100dp"          android:background="#C0E1B8"          android:layout_alignParentBottom="true"          android:layout_alignParentRight="true"/>      <View          android:id="@+id/view_3"          android:layout_width="100dp"          android:layout_height="100dp"          android:background="#F5C4A3"         android:layout_below="@id/view_1"/>      <View          android:id="@+id/view_4"          android:layout_width="100dp"          android:layout_height="100dp"          android:background="#F5C4A3"          android:layout_toRightOf="@id/view_1"/>      <LinearLayout          android:id="@+id/ll_1"          android:layout_width="match_parent"          android:layout_height="200dp"          android:background="#A0C3F8"          android:layout_below="@id/view_3"          android:orientation="horizontal"          android:padding="15dp"          >          <View              android:id="@+id/view_5"              android:layout_width="100dp"              android:layout_height="match_parent"              android:background="#E7E7B1"              />          <RelativeLayout              android:layout_width="match_parent"              android:layout_height="match_parent"              android:background="#E4B4BE"              android:padding="20dp">              <View                  android:id="@+id/view_6"                  android:layout_width="100dp"                  android:layout_height="match_parent"                  android:background="#E7E7B1"                  />          </RelativeLayout>          </LinearLayout>  </RelativeLayout>

3.TextView

文字大小，颜色

显示不下使用

文字+icon

中划线，下划线

跑马灯