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package com.imooc.calculator;
import java.util.ArrayList;
import java.util.Arrays;
import bsh.EvalError;
import bsh.Interpreter;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity implements OnClickListener {
Button btn_0;
Button btn_1;
Button btn_2;
Button btn_3;
Button btn_4;
Button btn_5;
Button btn_6;
Button btn_7;
Button btn_8;
Button btn_9;
Button btn_point;// СÊýµã
Button btn_divide;// ³ýÒÔ
Button btn_multiply;// ³ËÒÔ
Button btn_minus;// ¼õÈ¥
Button btn_pluse;// ¼Ó
Button btn_equal;// µÈÓÚ
Button btn_clear;
Button btn_del;
EditText et_showview;
boolean needclear;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_0 = (Button) findViewById(R.id.btn_0);
btn_1 = (Button) findViewById(R.id.btn_1);
btn_2 = (Button) findViewById(R.id.btn_2);
btn_3 = (Button) findViewById(R.id.btn_3);
btn_4 = (Button) findViewById(R.id.btn_4);
btn_5 = (Button) findViewById(R.id.btn_5);
btn_6 = (Button) findViewById(R.id.btn_6);
btn_7 = (Button) findViewById(R.id.btn_7);
btn_8 = (Button) findViewById(R.id.btn_8);
btn_9 = (Button) findViewById(R.id.btn_9);
btn_point = (Button) findViewById(R.id.btn_point);// СÊýµã
btn_divide = (Button) findViewById(R.id.btn_divide);// ³ýÒÔ
btn_multiply = (Button) findViewById(R.id.btn_multiply);// ³ËÒÔ
btn_minus = (Button) findViewById(R.id.btn_minus);// ¼õÈ¥
btn_pluse = (Button) findViewById(R.id.btn_pluse);// ¼Ó
btn_equal = (Button) findViewById(R.id.btn_equal);// µÈÓÚ
btn_clear = (Button) findViewById(R.id.btn_clear);
btn_del = (Button) findViewById(R.id.btn_del);
et_showview = (EditText) findViewById(R.id.et_showview);
btn_0.setOnClickListener(this);
btn_1.setOnClickListener(this);
btn_2.setOnClickListener(this);
btn_3.setOnClickListener(this);
btn_4.setOnClickListener(this);
btn_5.setOnClickListener(this);
btn_6.setOnClickListener(this);
btn_7.setOnClickListener(this);
btn_8.setOnClickListener(this);
btn_9.setOnClickListener(this);
btn_point.setOnClickListener(this);
btn_divide.setOnClickListener(this);
btn_multiply.setOnClickListener(this);
btn_minus.setOnClickListener(this);
btn_pluse.setOnClickListener(this);
btn_equal.setOnClickListener(this);
btn_clear.setOnClickListener(this);
btn_del.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String str = et_showview.getText().toString();
switch (v.getId()) {
case R.id.btn_0:
case R.id.btn_1:
case R.id.btn_2:
case R.id.btn_3:
case R.id.btn_4:
case R.id.btn_5:
case R.id.btn_6:
case R.id.btn_7:
case R.id.btn_8:
case R.id.btn_9:
case R.id.btn_point:
if(needclear){
str = "";
et_showview.setText("");
}
et_showview.setText(str + ((Button) v).getText());
break;
case R.id.btn_pluse:
case R.id.btn_minus:
case R.id.btn_multiply:
case R.id.btn_divide:
if(needclear){
et_showview.setText("");
}
et_showview.setText(str +" "+((Button) v).getText()+" ");
break;
case R.id.btn_equal:
getResult();
break;
case R.id.btn_del:
if (str != null && !str.equals("")) {
et_showview.setText(str.substring(0, str.length() - 1));
}
break;
case R.id.btn_clear:
et_showview.setText("");
break;
}
}
/**
* »ñÈ¡¼ÆËã½á¹û
*/
private void getResult() {
needclear = true;
String exp = et_showview.getText().toString();
double r = 0;
int space = exp.indexOf(‘ ‘);//ÓÃÓÚËÑË÷¿Õ¸ñλÖÃ
String s1 = exp.substring(0, space);//s1ÓÃÓÚ±£´æµÚÒ»¸öÔËËãÊý
String op = exp.substring(space + 1, space + 2);//opÓÃÓÚ±£´æÔËËã·û
String s2 = exp.substring(space + 3);//s2ÓÃÓÚ±£´æµÚ¶þ¸öÔËËãÊý
double arg1 = Double.parseDouble(s1);//½«ÔËËãÊý´Óstringת»»ÎªSingle
double arg2 = Double.parseDouble(s2);
if(op.equals("£«")){
r = arg1 + arg2;
}else if(op.equals("£")){
r = arg1 - arg2;
}else if(op.equals("¡Á")){
r = arg1 * arg2;
}else if(op.equals("¡Â")){
if (arg2 == 0)
{
r=0;
}
else
{
r = arg1 / arg2;
}
}
if(!s1.contains(".")&&!s2.contains(".")){
int result = (int)r;
et_showview.setText(result+"");
}else{
et_showview.setText(r+"");
}
}
//
// /***
// * @param exp
// * ËãÊý±í´ïʽ
// * @return ¸ù¾Ý±í´ïʽ·µ»Ø½á¹û
// */
// private String getRs(String exp) {
// Interpreter bsh = new Interpreter();
// Number result = null;
// try {
// exp = filterExp(exp);
// result = (Number) bsh.eval(exp);
// } catch (EvalError e) {
// e.printStackTrace();
// return "0";
// }
// return result.doubleValue() + "";
// }
//
// /**
// * @param exp
// * ËãÊý±í´ïʽ
// * @return ÒòΪ¼ÆËã¹ý³ÌÖÐ,È«³ÌÐèÒªÓÐСÊý²ÎÓë.
// */
// private String filterExp(String exp) {
// String num[] = exp.split("");
// String temp = null;
// double dtemp = 0 ;
// String str_temp="";
// for (int i = 0; i < num.length; i++) {
// temp = num[i];
//
// if (temp.equals("+") || temp.equals("-") || temp.equals("¡Á")
// || temp.equals("¡Â")) {
// if(dtemp==0){
// dtemp=Double.parseDouble(str_temp);
// }
//
// str_temp="";
// }else{
// str_temp=str_temp+temp;
// }
// }
//
// int begin = 0, end = 0;
// for (int i = 1; i < num.length; i++) {
// temp = num[i];
// if (temp.matches("[+-/()*]")) {
// if (temp.equals("."))
// continue;
// end = i - 1;
// temp = exp.substring(begin, end);
// if (temp.trim().length() > 0 && temp.indexOf(".") < 0)
// num[i - 1] = num[i - 1] + ".0";
// begin = end + 1;
// }
// }
// return Arrays.toString(num).replaceAll("[\\[\\], ]", "");
// }
}
package com.imooc.calculator; import java.util.ArrayList; import java.util.List; import java.util.Stack; public class ExpressionUtil { public double eval(String exp) { List<String> list = infixExpToPostExp(exp+"#"); return doEval(list); } private double doEval(List<String> list) { Stack<String> stack = new Stack<String>(); String element; double n1, n2, result; try { for (int i = 0; i < list.size(); i++) { element = list.get(i); if (isOperator(element)) { n1 = Double.parseDouble(stack.pop()); n2 = Double.parseDouble(stack.pop()); result = doOperate(n2, n1, element); stack.push(new Double(result).toString()); } else { stack.push(element); } } return Double.parseDouble(stack.pop()); } catch (RuntimeException e) { throw new IllegalExpressionException(e.getMessage()); } } private double doOperate(double n1, double n2, String operator) { if (operator.equals("+")) return n1 + n2; else if (operator.equals("-")) return n1 - n2; else if (operator.equals("*")) return n1 * n2; else return n1 / n2; } private boolean isOperator(String str) { return str.equals("+") || str.equals("-") || str.equals("*") || str.equals("/"); } private List<String> infixExpToPostExp(String exp) { List<String> postExp = new ArrayList<String>(); StringBuffer numBuffer = new StringBuffer(); Stack<Character> opStack = new Stack<Character>(); char ch, preChar; opStack.push(‘#‘); try { for (int i = 0; i < exp.length();) { ch = exp.charAt(i); switch (ch) { case ‘+‘: case ‘-‘: if(i-1<0){ numBuffer.append(ch); ch = exp.charAt(++i); break; }else{ char c = exp.charAt(i-1); if(!Character.isDigit(c)){ numBuffer.append(ch); ch = exp.charAt(++i); break; } } case ‘*‘: case ‘/‘: preChar = opStack.peek(); while (priority(preChar) >= priority(ch)) { postExp.add("" + preChar); opStack.pop(); preChar = opStack.peek(); } opStack.push(ch); i++; break; case ‘(‘: opStack.push(ch); i++; break; case ‘)‘: char c = opStack.pop(); while (c != ‘(‘) { postExp.add("" + c); c = opStack.pop(); } i++; break; case ‘#‘: char c1; while (!opStack.isEmpty()) { c1 = opStack.pop(); if (c1 != ‘#‘) postExp.add("" + c1); } i++; break; case ‘ ‘: case ‘\t‘: i++; break; default: if (‘.‘==ch || Character.isDigit(ch)) { while (Character.isDigit(ch)) { numBuffer.append(ch); ch = exp.charAt(++i); } if(‘.‘==ch){ numBuffer.append(‘.‘); ch = exp.charAt(++i); }else{ postExp.add(numBuffer.toString()); numBuffer = new StringBuffer(); } } else { throw new IllegalExpressionException("illegal operator"); } } } } catch (RuntimeException e) { throw new IllegalExpressionException(e.getMessage()); } return postExp; } private int priority(char op) { switch (op) { case ‘+‘: case ‘-‘: return 1; case ‘*‘: case ‘/‘: return 2; case ‘(‘: case ‘#‘: return 0; } throw new IllegalExpressionException("Illegal operator"); } public static void main(String[] args) { System.out.println("AB+AB-BC+ABC*DAB+AB".replaceAll("\\bAB\\b", "1")); ExpressionUtil eval = new ExpressionUtil(); double result = eval.eval("0/3#"); System.out.println(result); } class IllegalExpressionException extends RuntimeException { private static final long serialVersionUID = 1L; public IllegalExpressionException() { } public IllegalExpressionException(String info) { super(info); } } }
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <EditText android:layout_width="fill_parent" android:layout_height="60dip" android:background="@drawable/whitebg" android:editable="false" android:id="@+id/et_showview" android:gravity="bottom|right" android:textSize="20sp" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_marginTop="20dip" android:gravity="center_horizontal" android:orientation="vertical" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:orientation="horizontal" > <Button android:layout_width="60dp" android:layout_height="60dp" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_clear" android:background="@drawable/white_btn_selector" android:text="C" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_del" android:background="@drawable/white_btn_selector" android:text="DEL" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_divide" android:background="@drawable/white_btn_selector" android:text="÷" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_multiply" android:background="@drawable/white_btn_selector" android:text="×" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:gravity="center_horizontal" android:orientation="horizontal" > <Button android:layout_width="60dp" android:layout_height="60dp" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_7" android:background="@drawable/white_btn_selector" android:text="7" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_8" android:background="@drawable/white_btn_selector" android:text="8" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_9" android:background="@drawable/white_btn_selector" android:text="9" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_minus" android:background="@drawable/white_btn_selector" android:text="－" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:gravity="center_horizontal" android:orientation="horizontal" > <Button android:layout_width="60dp" android:layout_height="60dp" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_4" android:background="@drawable/white_btn_selector" android:text="4" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_5" android:background="@drawable/white_btn_selector" android:text="5" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_6" android:background="@drawable/white_btn_selector" android:text="6" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_pluse" android:background="@drawable/white_btn_selector" android:text="＋" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:gravity="center_horizontal" android:orientation="horizontal" > <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:layout_width="60dp" android:layout_height="60dp" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_1" android:background="@drawable/white_btn_selector" android:text="1" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_2" android:background="@drawable/white_btn_selector" android:text="2" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_3" android:background="@drawable/white_btn_selector" android:text="3" /> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:orientation="horizontal" > <Button android:layout_width="130dp" android:layout_height="60dp" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_0" android:background="@drawable/white_btn_selector" android:text="0" /> <Button android:layout_width="60dp" android:layout_height="60dp" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:text="." android:id="@+id/btn_point" android:background="@drawable/white_btn_selector" android:textSize="20sp"/> </LinearLayout> </LinearLayout> <Button android:layout_width="60dip" android:layout_height="130dip" android:layout_marginLeft="10dip" android:gravity="bottom|right" android:paddingBottom="10dp" android:paddingRight="10dp" android:textSize="20sp" android:id="@+id/btn_equal" android:background="@drawable/orange_btn_selector" android:text="=" /> </LinearLayout> </LinearLayout> </LinearLayout>
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原文地址：http://www.cnblogs.com/sansansan/p/5139859.html
