GridLayout网格布局

网格布局由GridLayout所代表，它是Android4.0新增的布局管理器

• GridLayout的基本设置：
  android:columnCount=""
  android:rowCount=""

• 元素cell的基本控制
  android:layout_columnWeight="1"
  android:layout_rowWeight="1"
  android:layout_row=""
  android:layout_rowSpan=""
  android:layout_column=""
  android:layout_columnSpan=""
  制作一个简易计算器的界面：

  
  计算器.PNG

<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerInParent="true"
    android:alignmentMode="alignMargins"
    android:columnCount="4"
    android:rowCount="6">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="140dp"
        android:layout_columnSpan="4"
        android:background="#EE000000"
        android:gravity="bottom|right"
        android:padding="15dp"
        android:text="1"
        android:textColor="#FFFFFF"
        android:textSize="48sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="C"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="/"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="*"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="删除"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="7"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="8"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="9"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="-"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="4"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="5"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="6"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="+"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="1"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="2"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="3"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowSpan="2"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg1"
        android:text="="
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnSpan="2"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="0"
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <Button
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@drawable/cal_bg"
        android:text="."
        android:textColor="#FFFFFF"
        android:textSize="18sp" />
</GridLayout>