Android之一个简单计算器源代码

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 )

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源码下载地址：http://download.csdn.net/detail/x605940745/7148153

转载请注明出处:http://blog.csdn.net/x605940745

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.GridLayout;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];private GridLayout gly;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);gly=(GridLayout)findViewById(R.id.gly);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() {@Overridepublic 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;gly.setBackgroundResource(R.drawable.jz);}}}});Button cleargo = (Button) findViewById(R.id.cleargo);cleargo.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (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() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubnum = "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 {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (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;gly.setBackgroundResource(R.drawable.js);print.setText(num);}}// 根据条件计算class Compute implements OnClickListener {@Overridepublic void onClick(View arg0) {fistNumber = print.getText().toString();// TODO Auto-generated method stubswitch (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;gly.setBackgroundResource(R.drawable.js);}}class OnTake implements OnClickListener {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.chars:num = "-" + num;break;case R.id.charx:if(!num.equals("0"))num = BigDecimal.valueOf(1).divide(new BigDecimal(num),12,BigDecimal.ROUND_UP).stripTrailingZeros().toString();break;case R.id.txtb:num = new BigDecimal(num).divide(BigDecimal.valueOf(100),12,BigDecimal.ROUND_UP).stripTrailingZeros().toString();break;case R.id.txtv:Double numss = Math.sqrt(new BigDecimal(num).doubleValue());int stratindex=numss.toString().contains(".")?numss.toString().indexOf("."):0;num = numss.toString().length()>13?numss.toString().substring(0, 12+stratindex):numss.toString();}print.setText(num);flg=0;num = "0";}}@Overridepublic 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;}}

<pre code_snippet_id="275884" snippet_file_name="blog_20140404_2_5383103">

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.stripTrailingZeros().toString();}}

<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"    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" >    <EditText        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" />    <Button        android:id="@+id/cleargo"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_column="0"        android:layout_row="1"        android:text="《--" />    <Button        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" />    <Button        android:id="@+id/chars"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_column="1"        android:layout_row="1"        android:text="-/+" />    <Button        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" />    <Button        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" />    <Button        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" />    <Button        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" />    <Button        android:id="@+id/txtdivide"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_column="3"        android:layout_row="2"        android:text="÷" />    <Button        android:id="@+id/txtb"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_column="4"        android:layout_row="2"        android:text="%" />    <Button        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" />    <Button        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" />    <Button        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" />    <Button        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" />    <Button        android:id="@+id/txtv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_column="4"        android:layout_row="3"        android:text="√" />    <Button        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" />    <Button        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" />    <Button        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" />    <Button        android:id="@+id/txtmin"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_column="3"        android:layout_row="4"        android:text="-" />    <Button        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="=" />    <Button        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" />    <Button        android:id="@+id/txtspl"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_column="2"        android:layout_row="5"        android:text="." />    <Button        android:id="@+id/txttakesum"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_column="3"        android:layout_row="5"        android:text="+" /></GridLayout>

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