安卓计算器

Android实验报告题目：简易计算机

专业：软件工程

班级： 1101

学号： 1130070120

姓名：陈佳妍

指导教师：傅龙天

完成日期：2014年 3月 30 日

一、课程设计目的

二、目前手机可以说是普及率非常高的电子设备了，由于其便于携带，使用方便，资费适中等等原因，现在手机已经在一定程度开始代替固定电话的通话功能，以及一些原来电脑软件上的功能了。手机上的软件也随着手机的发展变得丰富起来了，时至今日已经出现了很多专门制作手机软件的公司，虽然制作的多是游戏软件，但是一些辅助性的工具软件也有了很多.我们在此次系统中所做的工作主要是设计整个系统以及利用编程语言实现整个系统，使系统能够正确的运行计算功能。

三、课程设计内容

实现计算机简单的四则运算

三、课程设计过程

功能实现：

加法：

减法：

乘法：

除法：

7．附录

源代码：

package com.example.cjy;

import android.os.Bundle;

import android.app.Activity;

import android.view.Gravity;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends Activity {

Button b1;

Button b2;

Button b3;

Button b4;

Button b5;

Button b6;

Button b7;

Button b8;

Button b9;

Button b10;

Button b11;

Button b12;

Button b13;

Button b14;

Button b15;

Button b16;

Button b17;

EditText t;

float a,b,c;

String all = "";

int x = 0,y = 0,z = 0,k = 0;

int clear = 0;

@Override

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

setContentView(https://www.360docs.net/doc/ac2840560.html,yout.activity_main);

//t.setGravity(Gravity.RIGHT);

b1 = (Button)findViewById(R.id.button1);

b2 = (Button)findViewById(R.id.button2);

b3 = (Button)findViewById(R.id.button3);

b4 = (Button)findViewById(R.id.button4);

b5 = (Button)findViewById(R.id.button5);

b6 = (Button)findViewById(R.id.button6);

b7 = (Button)findViewById(R.id.button7);

b8 = (Button)findViewById(R.id.button8);

b9 = (Button)findViewById(R.id.button9);

b10 = (Button)findViewById(R.id.button10);

b11 = (Button)findViewById(R.id.button11);

b12 = (Button)findViewById(R.id.button12);

b13 = (Button)findViewById(R.id.button13);

b14 = (Button)findViewById(R.id.button14);

b15 = (Button)findViewById(R.id.button15);

b16 = (Button)findViewById(R.id.button16);

b17 = (Button)findViewById(R.id.button17);

t = (EditText)findViewById(R.id.editText1);

b1.setOnClickListener(new Button.OnClickListener(){//1

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b1.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b1.getText();

t.setText(all);

}

}});

b2.setOnClickListener(new Button.OnClickListener(){//2

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b2.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b2.getText();

t.setText(all);

}

}});

b3.setOnClickListener(new Button.OnClickListener(){//3

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b3.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b3.getText();

t.setText(all);

}

}});

b4.setOnClickListener(new Button.OnClickListener(){//4

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b4.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b4.getText();

t.setText(all);

}

}});

b5.setOnClickListener(new Button.OnClickListener(){//5

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b5.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b5.getText();

t.setText(all);

}

}});

b6.setOnClickListener(new Button.OnClickListener(){//6

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b6.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b6.getText();

t.setText(all);

}

}});

b7.setOnClickListener(new Button.OnClickListener(){//7

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b7.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b7.getText();

t.setText(all);

}

}});

b8.setOnClickListener(new Button.OnClickListener(){//8

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b8.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b8.getText();

t.setText(all);

}

}});

b9.setOnClickListener(new Button.OnClickListener(){//9

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b9.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b9.getText();

t.setText(all);

}

}});

b10.setOnClickListener(new Button.OnClickListener(){//.

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b10.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b10.getText();

t.setText(all);

}

}});

b11.setOnClickListener(new Button.OnClickListener(){//0

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

all = all + b11.getText();

t.setText(all);

clear = 0;

}

else{

all = all + b11.getText();

t.setText(all);

}

}});

b12.setOnClickListener(new Button.OnClickListener(){//=

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(x == 1){

b =

Float.parseFloat(all.substring(all.indexOf("+")+1,all.length()));

c = a + b;

all = String.valueOf(c);

}

else if(y == 1){

b =

Float.parseFloat(all.substring(all.indexOf("-")+1,all.length()));

c = a - b;

all = String.valueOf(c);

}

else if(z == 1){

b =

Float.parseFloat(all.substring(all.indexOf("*")+1,all.length()));

c = a * b;

all = String.valueOf(c);

}

else if(k == 1){

b =

Float.parseFloat(all.substring(all.indexOf("/")+1,all.length()));

c = a / b;

all = String.valueOf(c);

}

else

all = "输入不正确";

t.setText(all);

clear = 1;

x = 0;y = 0;z = 0;k = 0;

}});

b13.setOnClickListener(new Button.OnClickListener(){///

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

k = 1;

if(clear == 1){

all = "";

all = all + b13.getText();

t.setText(all);

clear = 0;

}

else{

a = Float.parseFloat(all);

all = all + b13.getText();

t.setText(all);

}

}});

b14.setOnClickListener(new Button.OnClickListener(){//*

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

z = 1;

if(clear == 1){

all = "";

all = all + b14.getText();

t.setText(all);

clear = 0;

}

else{

a = Float.parseFloat(all);

all = all + b14.getText();

t.setText(all);

}

}});

b15.setOnClickListener(new Button.OnClickListener(){//-

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

y = 1;

if(clear == 1){

all = "";

all = all + b15.getText();

t.setText(all);

clear = 0;

}

else{

a = Float.parseFloat(all);

all = all + b15.getText();

t.setText(all);

}

}});

b16.setOnClickListener(new Button.OnClickListener(){//+

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

x = 1;

if(clear == 1){

all = "";

all = all + b16.getText();

t.setText(all);

clear = 0;

}

else{

a = Float.parseFloat(all);

all = all + b16.getText();

t.setText(all);

}

}});

b17.setOnClickListener(new Button.OnClickListener(){//del

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(clear == 1){

all = "";

}

else{

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

}

t.setText(all);

}});

}

@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;

}

}

四、课程设计体会

这次项目android计算器项目设计是在eclipse平台下设计，到现在为止，该系统的功能基本符合了普通计算器的要求，整个系统界面简单明了，使用起来十分方便，具有普通计算器的基本功能，同时拓展了一些普通计算器上没有的部分科学计算功能。在整个开发过程中，从需求分析到总体架构的构思，到最后代码的编写我投入了大量的时间和精力，对系统中的每个功能都进行了反复的调试，修改。因为这是我是第一次系统性的进行软件的开发，不论是在知识层面、开发平台的使用层面还是经验方面都有着很大的欠缺和不足，因此本软件难免会有一些功能不完善、界面不美观等一些不尽如人意的地方，但是再短短一个星期的时间内，我已经进行了很大的努力。