网格布局 GridLayout

网格布局，按照行、列组成一个个网格

界面代码：

<?xml version="1.0" encoding="utf-8"?>

<GridLayout

        xmlns:android="http://schemas.android.com/apk/res/android"

        xmlns:tools="http://schemas.android.com/tools"

        xmlns:app="http://schemas.android.com/apk/res-auto"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:rowCount="6"

        android:columnCount="4"

        android:id="@+id/root"

        tools:context=".MainActivity">

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_columnSpan="4"

        android:textSize="50sp"

        android:layout_marginLeft="2pt"

        android:layout_marginRight="2pt"

        android:padding="3pt"

        android:layout_gravity="right"

        android:background="#eee"

        android:textColor="#000"

        android:text="0"

    />

    <Button

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_columnSpan="4"

            android:text="清除"

    />

</GridLayout>

我们用xml添加两个组件，占4列，然后用代码添加其他16个组件

package com.example.gridlayout

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.view.Gravity

import android.widget.Button

import android.widget.GridLayout

class MainActivity : AppCompatActivity() {

    private var chars = arrayOf("7","8","9","/",

        "4","5","6","x",

        "1","2","3","--",

        ".","0","=","+")

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        var gridLayout = findViewById<GridLayout>(R.id.root)

        for(i in chars.indices)

        {

            val bn = Button(this)

            bn.text = chars[i]

            //设置按钮字号大小

            bn.textSize = 40F

            //设置按钮空白区域

            bn.setPadding(5,35,5,35)

            //指定按钮所在的行

            val rowSpec = GridLayout.spec(i/4+2)

            //指定所在的列

            val columnSpec = GridLayout.spec(i%4)

            val params = GridLayout.LayoutParams(rowSpec,columnSpec)

            //指定组件占满父容器

            params.setGravity(Gravity.FILL)

            gridLayout.addView(bn,params)

        }

    }

}