表格布局—计算器

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

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

  android :id= "@+id/root"

  android :layout_width= "match_parent"

  android :layout_height= "match_parent"

  android :columnCount= "4"

  android :rowCount= "6">

  <!--计算器界面-->

  <!--设置文本框的前景色，背景色等属性-->

  <TextView

  android :layout_width= "match_parent"

  android :layout_height= "100dp"

  android :layout_columnSpan= "4"

  android :layout_gravity= "right"

  android :layout_marginLeft= "4px"

  android :layout_marginRight= "4px"

  android :background= "#eee"

  android :padding= "5px"

  android :text= "0"

  android :textColor= "#000"

  android :textSize= "50sp" />

  <!--定义一个横跨实列的按钮-->

  <Button

  android :layout_width= "match_parent"

  android :layout_height= "70dp"

  android :layout_columnSpan= "4"

  android :text= "清除" />

</GridLayout>

package com.eson.gridlayouttest ;

import android.app.Activity ;

import android.os.Bundle ;

import android.view.Gravity ;

import android.widget.Button ;

import android.widget.GridLayout ;

public class MainActivity extends Activity {

  GridLayout gridLayout ;

  String[] chars =new String[]{

  "7" , "8", "9" ,"/" ,

  "4" , "5", "6" ,"*" ,

  "1" , "2", "3" ,"-" ,

  "." , "0", "=" ,"+"

  } ;

  @Override

  public void onCreate (Bundle savedInstanceState) {

  super .onCreate(savedInstanceState) ;

  setContentView(R.layout. gridlayout );

  gridLayout = (GridLayout) findViewById(R.id. root );

  for ( int i = 0 ; i <chars . length ; i++) {

  Button button = new Button( this );

  button.setText( chars [i]);

  //设置该按钮的字号大小

  button.setTextSize( 70 );

  //指定该组所在的行

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

  //指定该组所在的列

  GridLayout.Spec columnSpec = GridLayout. spec(i % 4 );

  GridLayout.LayoutParams params = new GridLayout.LayoutParams(rowSpec , columnSpec) ;

  //指定该组件占满父容器

  params.setGravity(Gravity. FILL );

  gridLayout .addView(button ,params) ;

  }

  }

}