PercentRelativelayout
一个能以百分比来定义子控件大小的ViewGroup.该控件继承Relativelayout.所以有Relativelayout的所有属性
<?xml version="1.0" encoding="utf-8"?>
<com.example.customviewgroup2.view.PercentRelativeLayout
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.customviewgroup2.MainActivity">
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:background="@android:color/darker_gray"
android:layout_height="wrap_content"
app:percentWidth="0.7"
app:percentHeight="0.5"
android:text="Hello World!"/>
<Button
android:layout_width="wrap_content"
android:layout_below="@id/tv"
app:percentWidth="0.3"
app:percentHeight="0.3"
android:text="button"
android:layout_height="wrap_content"/>
</com.example.customviewgroup2.view.PercentRelativeLayout>
