Android简易计算器

package com.calculator;
import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.widget.*;
import android.view.*;
import android.view.View.OnClickListener;

public class Calculator extends Activity {
	
	//创建控件的引用
	private EditText result;
	private Button delete;
	private Button clear;
	private Button one;
	private Button two;
	private Button three;
	private Button four;
	private Button five;
	private Button six;
	private Button seven;
	private Button eight;
	private Button nine;
	private Button zero;
	private Button division;
	private Button multiply;
	private Button subtract;
	private Button addition;
	private Button amount;

	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //取得控件的实例
        result = (EditText)findViewById(R.id.result);
        delete = (Button)findViewById(R.id.delete);
        clear = (Button)findViewById(R.id.clear);
        one = (Button)findViewById(R.id.one);
        two = (Button)findViewById(R.id.two);
        three = (Button)findViewById(R.id.three);
        four = (Button)findViewById(R.id.four);
        five = (Button)findViewById(R.id.five);
        six = (Button)findViewById(R.id.six);
        seven = (Button)findViewById(R.id.seven);
        eight = (Button)findViewById(R.id.eight);
        nine = (Button)findViewById(R.id.nine);
        zero = (Button)findViewById(R.id.zero);
        division = (Button)findViewById(R.id.division);
        multiply = (Button)findViewById(R.id.multiply);
        subtract = (Button)findViewById(R.id.subtract);
        addition = (Button)findViewById(R.id.addition);
        amount = (Button)findViewById(R.id.amount);

        //定义按键的监听器
        clear.setOnClickListener(new clearClickListener());
        delete.setOnClickListener(new deleteClickListener());
        one.setOnClickListener(new oneClickListener());
        two.setOnClickListener(new twoClickListener());
        three.setOnClickListener(new threeClickListener());
        four.setOnClickListener(new fourClickListener());
        five.setOnClickListener(new fiveClickListener());
        six.setOnClickListener(new sixClickListener());
        seven.setOnClickListener(new sevenClickListener());
        eight.setOnClickListener(new eightClickListener());
        nine.setOnClickListener(new nineClickListener());
        zero.setOnClickListener(new zeroClickListener());
        division.setOnClickListener(new divisionClickListener());
        multiply.setOnClickListener(new multiplyClickListener());
        subtract.setOnClickListener(new subtractClickListener());
        addition.setOnClickListener(new additionClickListener());
        amount.setOnClickListener(new amountClickListener());
    }
	class clearClickListener implements OnClickListener{
		public void onClick(View v) {
			result.setText("");
		}	
	}
	
	class deleteClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			if(str.length()>=1){
				result.setText(str.substring(0, str.length()-1));
			}
		}
	}
	
	class oneClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+1);
		}
	}
	
	class twoClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+2);
		}
	}
	
	class threeClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+3);
		}
	}
	
	class fourClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+4);
		}
	}
	
	class fiveClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+5);
		}	
	}
	
	class sixClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+6);
		}
	}
	
	class sevenClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+7);
		}
	}
	
	class eightClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+8);
		}	
	}
	
	class nineClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+9);
		}
	}
	
	class zeroClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			result.setText(str+0);
		}
	}
	
	class divisionClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			char ch = str.charAt(str.length()-1);
			if(ch != '+' && ch != '-' && ch != '/' && ch != '*'){
				result.setText(str+"/");
			}else{
				result.setText(str.substring(0, str.length()-1)+"/");
			}
		}
	}
	
	class multiplyClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			char ch = str.charAt(str.length()-1);	
			if(ch != '+' && ch != '-' && ch != '/' && ch != '*'){
				result.setText(str+"*");
			}else{
				result.setText(str.substring(0, str.length()-1)+"*");
			}
		}	
	}
	
	class subtractClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			char ch = str.charAt(str.length()-1);
			if(ch != '+' && ch != '-' && ch != '/' && ch != '*'){
				result.setText(str+"-");
			}else{
				result.setText(str.substring(0, str.length()-1)+"-");
			}
		}
	}
	
	class additionClickListener implements OnClickListener{
		public void onClick(View v) {
			String str = result.getText().toString();
			char ch = str.charAt(str.length()-1);		
			if(ch != '+' && ch != '-' && ch != '/' && ch != '*'){
				result.setText(str+"+");
			}else{
				result.setText(str.substring(0, str.length()-1)+"+");
			}
			}	
	}
	
	class amountClickListener implements OnClickListener{
		public void onClick(View v) {
			int now = 100;
			int index = 1;
			int[] operator = new int[10];
			operator[0] = 0;
			double a = 0;
			double b = 0;
			ArrayList<Double> numArray = new ArrayList<Double>(); 
			String str = result.getText().toString();		
			StringBuffer bsNum = new StringBuffer();
			StringBuffer bsOper = new StringBuffer();
			String ss[]=new String[100];
			int t=0;
			for(int i=0; i<str.length(); i++)
			{	
				if(str.charAt(i) >= 48 && str.charAt(i) <= 57)			
					bsNum.append(str.charAt(i));				
				else if(str.charAt(i)== '+' || str.charAt(i)== '-' || str.charAt(i)== '*' || str.charAt(i)== '/')
				{	
					ss[t]=bsNum.toString();
					t++;
					int sum=bsNum.length();
					bsNum.delete(0, sum);
					if(bsOper.toString().equals(""))
					{
						bsOper.append(str.charAt(i));	
						switch(str.charAt(i))
						{				
							case '+':
								now = 1;
								break;
							case '-':
								now = 1;
								break;
							case '*':
								now = 2;
								break;
							case '/':
								now = 2;
								break;
							default:
								break;							
						}				
						operator[index] = now;
						index++;				
					}else
					{					
						switch(str.charAt(i))
						{					
							case '+':
								now = 1;
								break;
							case '-':
								now = 1;
								break;
							case '*':
								now = 2;
								break;
							case '/':
								now = 2;
								break;
							default:
								break;								
						}
						while(now <= operator[index - 1]){
							bsNum.append(bsOper.charAt(bsOper.length()-1));
							ss[t]=bsNum.toString();
							t++;
							sum=bsNum.length();
							bsNum.delete(0, sum);
							bsOper.deleteCharAt(bsOper.length()-1);
							index--;
						}
						bsOper.append(str.charAt(i));					
						operator[index] = now;
						index++;
					}
				}
				System.out.println("bsNum  : "+bsNum);
				System.out.println("bsOper  : "+bsOper);
			}	
			ss[t]=bsNum.toString();
			t++;
			int sum=bsNum.length();
			bsNum.delete(0, sum);
			while(!bsOper.toString().equals("")){
				bsNum.append(bsOper.charAt(bsOper.length()-1));
				ss[t]=bsNum.toString();
				t++;
				sum=bsNum.length();
				bsNum.delete(0, sum);
				bsOper.deleteCharAt(bsOper.length()-1);
			}		
			System.out.println("bsNum  : "+bsNum);
			System.out.println("bsOper  : "+bsOper);
			System.out.println("hello world!");
			for(int i=0;i<t;i++)
				System.out.println(ss[i]);
			for(int i=0; i<t; i++){		
			if(ss[i].equals("+"))
			{
							a = numArray.get(numArray.size()-1);
							b = numArray.get(numArray.size()-2);
							numArray.remove(numArray.size()-1);
							numArray.remove(numArray.size()-1);
							System.out.println(a+" "+b);
							numArray.add(Double.valueOf(b+a));					
			}else if(ss[i].equals("-"))
			{
							a = numArray.get(numArray.size()-1);
							b = numArray.get(numArray.size()-2);
							numArray.remove(numArray.size()-1);
							numArray.remove(numArray.size()-1);
							System.out.println(a+" "+b);
							numArray.add(Double.valueOf(b-a));					
			}else if(ss[i].equals("*"))
			{
							a = numArray.get(numArray.size()-1);
							b = numArray.get(numArray.size()-2);
							numArray.remove(numArray.size()-1);
							numArray.remove(numArray.size()-1);
							System.out.println(a+" "+b);
							numArray.add(Double.valueOf(b*a));
			}else if(ss[i].equals("/"))
			{
							a = numArray.get(numArray.size()-1);
							b = numArray.get(numArray.size()-2);
							numArray.remove(numArray.size()-1);
							numArray.remove(numArray.size()-1);
							System.out.println(a+" "+b);
							numArray.add(Double.valueOf(b/a));					
			}
			else		
				numArray.add(Double.parseDouble(ss[i]));
			}
			System.out.println("result  : "+numArray.get(0).doubleValue());
			String s = String.valueOf(numArray.get(0).doubleValue());
			result.setText(String.valueOf(s));
		}	
	}
}