文件名称：实现加减乘除等简单计算的Android计算器源码包
文件大小：4.75MB
文件格式：7Z
更新时间：2021-05-22 13:23:45
Android
package ymq.demo03;
import android.app.Activity;
import android.os.Bundle;
import android.view.*;
import android.widget.*;
public class demo03 extends Activity {
/** Called when the activity is first created. */
String str="";
EditText et;
int c=0,flag=0;
double b=0.0,g=0.0,f=0.0;
View vi;
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
menu.add(0, 1, 1, "退出");
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
if(item.getItemId()==1){finish();}
return super.onOptionsItemSelected(item);
}
//计算方法
public double calculater(){
switch(c){
case 0:f=g;break;
case 1:f=b+g;break;
case 2:f=b-g;break;
case 3:f=b*g;break;
case 4:f=b/g;break;
}
b=f;
c=0;
return f;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//获得按键
final Button number[]=new Button[10];
final Button fuhao[]=new Button[11];
fuhao[0]=(Button)findViewById(R.id.button01);
fuhao[1]=(Button)findViewById(R.id.button02);
fuhao[2]=(Button)findViewById(R.id.button03);
fuhao[3]=(Button)findViewById(R.id.button04);
fuhao[4]=(Button)findViewById(R.id.button05);
fuhao[5]=(Button)findViewById(R.id.button06);
fuhao[6]=(Button)findViewById(R.id.buttonce);
fuhao[7]=(Button)findViewById(R.id.buttonc);
fuhao[8]=(Button)findViewById(R.id.zheng);
fuhao[9]=(Button)findViewById(R.id.kaifang);
fuhao[10]=(Button)findViewById(R.id.pingfang);
number[0]=(Button)findViewById(R.id.button0);
number[1]=(Button)findViewById(R.id.button1);
number[2]=(Button)findViewById(R.id.button2);
number[3]=(Button)findViewById(R.id.button3);
number[4]=(Button)findViewById(R.id.button4);
number[5]=(Button)findViewById(R.id.button5);
number[6]=(Button)findViewById(R.id.button6);
number[7]=(Button)findViewById(R.id.button7);
number[8]=(Button)findViewById(R.id.button8);
number[9]=(Button)findViewById(R.id.button9);
et=(EditText) findViewById(R.id.textView1);
et.setText(str);
fuhao[6].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
str="";
et.setText(str);
vi=v;
}
});
fuhao[7].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
b=0.0;c=0;g=0.0;
str="";
et.setText(str);
}
});
fuhao[8].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(vi!=fuhao[5]&&str;!=""){
char ch=str.charAt(0);
if(ch=='-')
str=str.replace("-","");
else
str="-"+str;
et.setText(str);
}
}
});
fuhao[9].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(str!=""){
double a=Double.parseDouble(str);
str=Math.sqrt(a)+"";
et.setText(str);
}}
});
fuhao[10].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(str!=""){
double a=Double.parseDouble(str);
str=""+a*a;
et.setText(str);
}}
});
//设定数字按键
number[0].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=0;
et.setText(str);
flag=0;
}
else{
char ch1[];
ch1=str.toCharArray();
if(!(ch1.length==1&&ch1;[0]=='0'))
{str+=0;
et.setText(str);}
}
vi=v;
}
});
number[1].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=1;
et.setText(str);
flag=0;
}
else{
str+=1;
et.setText(str);
}
vi=v;
}
});
number[2].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=2;
et.setText(str);
flag=0;
}
else{
str+=2;
et.setText(str);
}
vi=v;
}
});
number[3].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=3;
et.setText(str);
flag=0;
}
else{
str+=3;
et.setText(str);
}
vi=v;
}
});
number[4].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=4;
et.setText(str);
flag=0;
}
else{
str+=4;
et.setText(str);
}
vi=v;
}
});
number[5].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=5;
et.setText(str);
flag=0;
}
else{
str+=5;
et.setText(str);
}
vi=v;
}
});
number[6].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=6;
et.setText(str);
flag=0;
}
else{
str+=6;
et.setText(str);
}
vi=v;
}
});
number[7].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=7;
et.setText(str);
flag=0;
}
else{
str+=7;
et.setText(str);
}
vi=v;
}
});
number[8].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=8;
et.setText(str);
flag=0;
}
else{
str+=8;
et.setText(str);
}
vi=v;
}
});
number[9].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(flag==1){
str="";
str+=9;
et.setText(str);
flag=0;
}
else{
str+=9;
et.setText(str);
}
vi=v;
}
});
//设定符号键
//加
fuhao[0].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(str!=""){
if(vi==fuhao[0]||vi==fuhao[1]||vi==fuhao[2]||vi==fuhao[3]){
c=1;
}
else{
g=Double.parseDouble(str);
calculater();
str=""+f;
et.setText(str);
c=1;
flag=1;
vi=v;
}}
}
});
//减
fuhao[1].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(str!=""){
if(vi==fuhao[0]||vi==fuhao[1]||vi==fuhao[2]||vi==fuhao[3]){
c=2;
}
else{
g=Double.parseDouble(str);
calculater();
str=""+f;
et.setText(str);
c=2;
flag=1;
vi=v;
}}
}
});
//乘
fuhao[2].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(str!=""){
if(vi==fuhao[0]||vi==fuhao[1]||vi==fuhao[2]||vi==fuhao[3]){
c=3;
}
else{
g=Double.parseDouble(str);
calculater();
str=""+f;
et.setText(str);
c=3;
flag=1;
vi=v;
}}
}
});
//除
fuhao[3].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(str!=""){
if(vi==fuhao[0]||vi==fuhao[1]||vi==fuhao[2]||vi==fuhao[3]){
c=4;
}
else{
g=Double.parseDouble(str);
calculater();
str=""+f;
et.setText(str);
c=4;
flag=1;
vi=v;
}}
}
});
//等号
fuhao[4].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(str!=""&&vi;!=fuhao[0]&&vi;!=fuhao[1]&&vi;!=fuhao[2]&&vi;!=fuhao[3]){
g=Double.parseDouble(str);
calculater();
str=""+f;
et.setText(str);
flag=1;
vi=v;
}
}
});
//小数点
fuhao[5].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(str==""){
str+=".";
et.setText(str);
}
else{
char ch1[];int x=0;
ch1=str.toCharArray();
for(int i=0;i