通过Android4.0 网格布局GridLayout来实现一个简单的计算器界面布局   源码如下(欢迎大家指导 批评 )

package com.android.xiong.gridlayoutTest;

import java.math.BigDecimal;

import java.util.regex.Pattern;

import com.android.xiong.gridlayoutTest.R.id;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends Activity {

private EditText print;

private static String fistNumber = "0";// 第一次输入的值

private static String secondNumber = "0";// 第二次输入的值

private static String num = "0";// 显示的结果

private static int flg = 0;// 结果累加一次

public Counts take = null;

private int[] btidTake = { R.id.txtdivide, R.id.txtx, R.id.txtmin,

R.id.txttakesum };

private Button[] buttonTake = new Button[btidTake.length];

private int[] btidNum = { R.id.txt0, R.id.txt1, R.id.txt2, R.id.txt3,

R.id.txt4, R.id.txt5, R.id.txt6, R.id.txt7, R.id.txt8, R.id.txt9,

R.id.txtspl };

private Button[] buttons = new Button[btidNum.length];

private int[] btcl = { R.id.chars, R.id.charx, R.id.txtb, R.id.txtv };

private Button[] btcls = new Button[btcl.length];

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

print = (EditText) findViewById(R.id.print);

print.setText("0");

print.setEnabled(false);

GetNumber get = new GetNumber();

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

buttons[i] = (Button) findViewById(btidNum[i]);

buttons[i].setOnClickListener(get);

}

Compute cm = new Compute();

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

buttonTake[i] = (Button) findViewById(btidTake[i]);

buttonTake[i].setOnClickListener(cm);

}

Button eq = (Button) findViewById(R.id.txteq);

eq.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

if (flg == 0) {

secondNumber = print.getText().toString();

if (take == Counts.DIVIDE && secondNumber.equals("0")) {

print.setText("0不能为被除数");

} else {

num = take.Values(fistNumber, secondNumber);

fistNumber = num;

secondNumber = "0";

print.setText(num);

flg = 1;

}

}

}

});

Button cleargo = (Button) findViewById(R.id.cleargo);

cleargo.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if (num.length() > 1) {

num = num.substring(0, num.length() - 1);

} else {

num = "0";

}

print.setText(num);

}

});

Button clear = (Button) findViewById(R.id.clear);

clear.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

num = "0";

fistNumber = secondNumber = num;

print.setText(num);

flg = 0;

}

});

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

btcls[i] = (Button) findViewById(btcl[i]);

btcls[i].setOnClickListener(new OnTake());

}

}

// 给 EditText赋值

class GetNumber implements OnClickListener {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if (flg == 1)

num = "0";

if (num.equals("0")) {

print.setText("");

num = v.getId() == R.id.txtspl ? "0" : "";

}

String txt = ((Button) v).getText().toString();

boolean s = Pattern.matches("(\\d+).?(\\d)*", num + txt);

num = s ? (num + txt) : num;

print.setText(num);

}

}

// 根据条件计算

class Compute implements OnClickListener {

@Override

public void onClick(View arg0) {

fistNumber = print.getText().toString();

// TODO Auto-generated method stub

switch (arg0.getId()) {

case R.id.txttakesum:

take = Counts.ADD;

break;

case R.id.txtmin:

take = Counts.MINUS;

break;

case R.id.txtx:

take = Counts.MULTIPLY;

break;

case R.id.txtdivide:

take = Counts.DIVIDE;

break;

}

num = "0";

flg = 0;

}

}

class OnTake implements OnClickListener {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

switch (v.getId()) {

case R.id.chars:

num = "-" + num;

break;

case R.id.charx:

num = BigDecimal.valueOf(1).divide(new BigDecimal(num))

.toString();

break;

case R.id.txtb:

num = new BigDecimal(num).divide(BigDecimal.valueOf(100))

.toString();

break;

case R.id.txtv:

Double numss = Math.sqrt(new BigDecimal(num).doubleValue());

num = numss.toString();

}

print.setText(num);

flg=0;

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

package com.android.xiong.gridlayoutTest;

import java.math.BigDecimal;

public enum Counts {

ADD, MINUS, MULTIPLY, DIVIDE, MARK, ROOT;

public String Values(String num1, String num2) {

BigDecimal number1 = new BigDecimal(num1);

BigDecimal number2 = new BigDecimal(num2);

BigDecimal number = BigDecimal.valueOf(0);

switch (this) {

case ADD:

number = number1.add(number2);

break;

case MINUS:

number = number1.subtract(number2);

break;

case MULTIPLY:

number = number1.multiply(number2);

break;

case DIVIDE:

number = number1.divide(number2,20,BigDecimal.ROUND_UP);

break;

}

return number.toString();

}

}

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

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="40px"

android:columnCount="5"

android:rowCount="6"

tools:context=".MainActivity" >

android:id="@+id/print"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_columnSpan="5"

android:layout_marginLeft="2px"

android:layout_marginRight="2px"

android:layout_row="0"

android:background="#eee" />

android:id="@+id/cleargo"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="0"

android:layout_row="1"

android:text="《--" />

android:id="@+id/clear"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="3"

android:layout_columnSpan="2"

android:layout_row="1"

android:layout_gravity="fill_horizontal"

android:text="清屏" />

android:id="@+id/chars"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="1"

android:layout_row="1"

android:text="-/+" />

android:id="@+id/charx"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="2"

android:layout_row="1"

android:text="1/x" />

android:id="@+id/txt7"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="0"

android:layout_row="2"

android:text="7" />

android:id="@+id/txt8"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="1"

android:layout_row="2"

android:text="8" />

android:id="@+id/txt9"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="2"

android:layout_row="2"

android:text="9" />

android:id="@+id/txtdivide"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="3"

android:layout_row="2"

android:text="÷" />

android:id="@+id/txtb"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="4"

android:layout_row="2"

android:text="%" />

android:id="@+id/txt4"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="0"

android:layout_row="3"

android:text="4" />

android:id="@+id/txt5"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="1"

android:layout_row="3"

android:text="5" />

android:id="@+id/txt6"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="2"

android:layout_row="3"

android:text="6" />

android:id="@+id/txtx"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="3"

android:layout_row="3"

android:text="X" />

android:id="@+id/txtv"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="4"

android:layout_row="3"

android:text="√" />

android:id="@+id/txt1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="0"

android:layout_row="4"

android:text="1" />

android:id="@+id/txt2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="1"

android:layout_row="4"

android:text="2" />

android:id="@+id/txt3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="2"

android:layout_row="4"

android:text="3" />

android:id="@+id/txtmin"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="3"

android:layout_row="4"

android:text="-" />

android:id="@+id/txteq"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="4"

android:layout_gravity="fill_vertical"

android:layout_row="4"

android:layout_rowSpan="2"

android:text="=" />

android:id="@+id/txt0"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="0"

android:layout_columnSpan="2"

android:layout_gravity="fill_horizontal"

android:layout_row="5"

android:text="0" />

android:id="@+id/txtspl"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="2"

android:layout_row="5"

android:text="." />

android:id="@+id/txttakesum"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_column="3"

android:layout_row="5"

android:text="+" />