android计算器
1、效果预览
2、项目布局
3、main.xml文件内容
4、MainActivity.java文件
package com.example.jsq;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Stack;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText edit=null;
private Button but1=null;
private Button but2=null;
private Button but3=null;
private Button but4=null;
private Button but5=null;
private Button but6=null;
private Button but7=null;
private Button but8=null;
private Button but9=null;
private Button but0=null;
private Button butJia=null;
private Button butJian=null;
private Button butCheng=null;
private Button butChu=null;
private Button butDian=null;
private Button butZuo=null;
private Button butYou=null;
private Button butTui=null;
private Button butBack=null;
private Button butx=null;
private Button butDeng=null;
static boolean ok=false;
static String jieguo="";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.edit=(EditText)super.findViewById(R.id.myEdit);
this.but0=(Button)super.findViewById(R.id.a0);
this.but1=(Button)super.findViewById(R.id.a1);
this.but2=(Button)super.findViewById(R.id.a2);
this.but3=(Button)super.findViewById(R.id.a3);
this.but4=(Button)super.findViewById(R.id.a4);
this.but5=(Button)super.findViewById(R.id.a5);
this.but6=(Button)super.findViewById(R.id.a6);
this.but7=(Button)super.findViewById(R.id.a7);
this.but8=(Button)super.findViewById(R.id.a8);
this.but9=(Button)super.findViewById(R.id.a9);
this.butJia=(Button)super.findViewById(R.id.jia);
this.butJian=(Button)super.findViewById(R.id.jian);
this.butCheng=(Button)super.findViewById(R.id.cheng);
this.butChu=(Button)super.findViewById(R.id.chu);
this.butZuo=(Button)super.findViewById(R.id.zuokuohao);
this.butYou=(Button)super.findViewById(R.id.youkuohao);
this.butTui=(Button)super.findViewById(R.id.tuibu);
this.butBack=(Button)super.findViewById(R.id.back);
this.butx=(Button)super.findViewById(R.id.ax);
this.butDeng=(Button)super.findViewById(R.id.deng);
this.butDian=(Button)super.findViewById(R.id.dian);
this.but0.setOnClickListener(new Ja0());
this.but1.setOnClickListener(new Ja1());
this.but2.setOnClickListener(new Ja2());
this.but3.setOnClickListener(new Ja3());
this.but4.setOnClickListener(new Ja4());
this.but5.setOnClickListener(new Ja5());
this.but6.setOnClickListener(new Ja6());
this.but7.setOnClickListener(new Ja7());
this.but8.setOnClickListener(new Ja8());
this.but9.setOnClickListener(new Ja9());
this.butZuo.setOnClickListener(new JaZuo());
this.butYou.setOnClickListener(new JaYou());
this.butDian.setOnClickListener(new JaDian());
this.butJia.setOnClickListener(new Jia());
this.butJian.setOnClickListener(new Jian());
this.butCheng.setOnClickListener(new cheng());
this.butChu.setOnClickListener(new chu());
this.butDeng.setOnClickListener(new deng());
this.butx.setOnClickListener(new jax());
this.butTui.setOnClickListener(new tui());
this.butBack.setOnClickListener(new back());
}
private class jax implements OnClickListener{
@Override
public void onClick(View arg0) {
if(MainActivity.this.edit.getText().toString().equals(""))
return;
if(ok){
MainActivity.this.edit.setText(jieguo);
ok=false;
}
String s=MainActivity.this.edit.getText().toString()+"=";
//text1.setText("√("+text1.getText()+")=");
s=s.replace("×", "*");
s=s.replace("÷", "/");
qiuzhi(s);
// MainActivity.deng.this.qiuzhi(s);
jieguo=Math.sqrt(Double.parseDouble(jieguo))+"";
jieguo=huajian(jieguo);
MainActivity.this.edit.setText("√("+MainActivity.this.edit.getText()+")="+jieguo);
ok=true;
}
}
private class back implements OnClickListener{
@Override
public void onClick(View arg0) {
MainActivity.this.edit.setText("0");
ok=false;
}
}
private class tui implements OnClickListener{
@Override
public void onClick(View arg0) {
String str=MainActivity.this.edit.getText().toString();
MainActivity.this.edit.setText(str.substring(0, str.length()-1<0?0: str.length()-1));
}
}
private class Ja0 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("0");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"0");
}
}
}
private class Ja1 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("1");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"1");
}
}
}
private class Ja2 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("2");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"2");
}
}
}
private class Ja3 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("3");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"3");
}
}
}
private class Ja4 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("4");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"4");
}
}
}
private class Ja5 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("5");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"5");
}
}
}
private class Ja6 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("6");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"6");
}
}
}
private class Ja7 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("7");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"7");
}
}
}
private class Ja8 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("8");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"8");
}
}
}
private class Ja9 implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("9");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"9");
}
}
}
private class JaDian implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+".");
}
}
private class JaYou implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+")");
}
}
private class JaZuo implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText("0");
ok=false;
}
if(MainActivity.this.edit.getText().toString().equals("0")){
MainActivity.this.edit.setText("(");
}
else{
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"(");
}
}
}
private class Jia implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText(jieguo);
ok=false;
}
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"+");
}
}
private class Jian implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText(jieguo);
ok=false;
}
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"-");
}
}
private class cheng implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText(jieguo);
ok=false;
}
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"x");
}
}
private class chu implements OnClickListener{
@Override
public void onClick(View arg0) {
if(ok){
MainActivity.this.edit.setText(jieguo);
ok=false;
}
MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"÷");
}
}
private class deng implements OnClickListener{
@Override
public void onClick(View arg0) {
try {
String s=MainActivity.this.edit.getText().toString()+"=";
String s1=s;
MainActivity.this.edit.setText(s);
s=s.replace("x", "*");
s=s.replace("÷", "/");
qiuzhi(s);
MainActivity.this.edit.setText(s1+jieguo);
ok=true;
} catch (Exception e1) {
MainActivity.this.edit.setText("式子不合法");
ok=true;
e1.printStackTrace();
}
}
}
public void qiuzhi(String s) {
HashMap map=new HashMap();//存运算符的优先级
Stack sk1=new Stack();//存数字
Stack sk2=new Stack();//存运算符
map=SUM(map);
boolean okk=true;
int x=0;
for(int i=0;i='0'&&a<='9'||a=='.')&&okk){
x=i;
okk=false;
}
else if(!(a>='0'&&a<='9'||a=='.')){//是运算符
//System.out.println(s.substring(x, i));
if(i>0&&s.charAt(i-1)<='9'&&s.charAt(i-1)>='0')//防止两个运算符一块，1*(..)
sk1.push(new BigDecimal(s.substring(x, i)));//将数字部分变成浮点型
okk=true;
if(sk2.isEmpty()){//运算符栈是空，运算符直接进栈
sk2.push(a);
}
else{//运算符栈不为空
if(map.get(sk2.peek())=map.get(a)&&sk2.peek()!='(')){//运算符栈不为空，且来的运算符级别较低，
switch(sk2.pop()){//最后进的运算符出栈，执行运算
case '+':{
BigDecimal c=sk1.pop();//数字栈后进的两个数字出栈开始运算，然后再进栈
BigDecimal d=sk1.pop();
c=c.add(d);sk1.push(c);break;
}
case '-':{
BigDecimal c=sk1.pop();
BigDecimal d=sk1.pop();
c=d.subtract(c);sk1.push(c);break;
}
case '*':{
BigDecimal c=sk1.pop();
BigDecimal d=sk1.pop();
c=c.multiply(d);sk1.push(c);break;
}
case '/':{
BigDecimal c=sk1.pop();
BigDecimal d=sk1.pop();
c=d.divide(c, 100, BigDecimal.ROUND_HALF_UP);sk1.push(c);break;
}
}
}
if(!sk2.isEmpty()&&sk2.peek()=='('&&a==')'){//消除运算之后的无意义括号
sk2.pop();
}
else
sk2.push(a);//其他来的运算符继续进栈
}
}
}
jieguo=sk1.pop().toPlainString();
jieguo=huajian(jieguo);
}
private String huajian(String j) {
if(j.indexOf(".")!=-1){
for(int i=j.length()-1;i>=0;i--){
if(j.endsWith("0")){
j=j.substring(0,j.length()-1);
}
else
break;
}
}
if(j.endsWith(".")){
j=j.substring(0,j.length()-1);
}
return j;
}
private HashMap SUM(HashMap map) {
map.put('=', 1);
map.put(')', 2);
map.put('+', 3);
map.put('-', 3);
map.put('*', 4);
map.put('/', 4);
map.put('(', 5);
return map;
}
@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;
}
}
项目下载---请到资源页面下载