本文实例为大家分享了Android Studio实现简易计算器的具体代码，供大家参考，具体内容如下
效果图：
源码：
布局样式：
Java部分源码：
package com.example.pyfcalculator;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
TextView textView;
Button button_return,button_00,button_01,button_02,button_03,
button_04,button_05,button_06,button_07,button_08,button_09,button_add,
button_clear,button_equal,button_except,button_reduce,button_ride,button_spot;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViewAndListener();
}
//注册监听方法
protected void initViewAndListener(){
button_return=findViewById(R.id.button_return);
button_00=findViewById(R.id.button_00);
button_01=findViewById(R.id.button_01);
button_02=findViewById(R.id.button_02);
button_03=findViewById(R.id.button_03);
button_04=findViewById(R.id.button_04);
button_05=findViewById(R.id.button_05);
button_06=findViewById(R.id.button_06);
button_07=findViewById(R.id.button_07);
button_08=findViewById(R.id.button_08);
button_09=findViewById(R.id.button_09);
button_add=findViewById(R.id.button_add);
button_clear=findViewById(R.id.button_clear);
button_equal=findViewById(R.id.button_equal);
button_except=findViewById(R.id.button_except);
button_reduce=findViewById(R.id.button_reduce);
button_ride=findViewById(R.id.button_ride);
button_spot=findViewById(R.id.button_spot);
button_return.setOnClickListener(this);
button_00.setOnClickListener(this);
button_01.setOnClickListener(this);
button_02.setOnClickListener(this);
button_03.setOnClickListener(this);
button_04.setOnClickListener(this);
button_05.setOnClickListener(this);
button_06.setOnClickListener(this);
button_07.setOnClickListener(this);
button_08.setOnClickListener(this);
button_09.setOnClickListener(this);
button_add.setOnClickListener(this);
button_clear.setOnClickListener(this);
button_equal.setOnClickListener(this);
button_except.setOnClickListener(this);
button_reduce.setOnClickListener(this);
button_ride.setOnClickListener(this);
button_spot.setOnClickListener(this);
textView=findViewById(R.id.textview_01);
}
private String num_in_now;//记录当前结果
private boolean flag=false;//记录计算器状态
int now_num=0;
@Override
public void onClick(View view) {
//获取文本框内容
String currentText=textView.getText().toString();
switch (view.getId()){
case R.id.button_00:
if ((textView.getText().toString().equals("0")))
return;
isflag("0");
break;
case R.id.button_01:
isflag("1");
break;
case R.id.button_02:
isflag("2");
break;
case R.id.button_03:
isflag("3");
break;
case R.id.button_04:
isflag("4");
break;
case R.id.button_05:
isflag("5");
break;
case R.id.button_06:
isflag("6");
break;
case R.id.button_07:
isflag("7");
break;
case R.id.button_08:
isflag("8");
break;
case R.id.button_09:
isflag("9");
break;
case R.id.button_add:
// textView.setText(textView.getText()+"+");
now_num++;
if(now_num>1){
equal();
}
isflag("+");
break;
case R.id.button_except:
// textView.setText(textView.getText()+"/");
now_num++;
if(now_num>1){
equal();
}
isflag("/");
break;
case R.id.button_spot:
// textView.setText(textView.getText()+".");
isflag(".");
break;
case R.id.button_reduce:
// textView.setText(textView.getText()+"-");
now_num++;
if(now_num>1){
equal();
}
isflag("-");
break;
case R.id.button_ride:
// textView.setText(textView.getText()+"*");
now_num++;
if(now_num>1){
equal();
}
isflag("*");
break;
case R.id.button_clear:
textView.setText("0");
flag=false;
now_num=0;
break;
case R.id.button_return:
if(TextUtils.isEmpty(textView.getText())){
return;
}
if (currentText.substring(0,currentText.length()-1).length()>0){
textView.setText(currentText.substring(0,currentText.length()-1));
}
else{
textView.setText("0");
flag=false;
now_num=0;
}
break;
case R.id.button_equal:
if(TextUtils.isEmpty(textView.getText())){
return;
}
equal();
flag=false;
now_num=0;
break;
}
}
private void equal(){
textView.setText(operation(textView.getText().toString()));
}
//运算方法
private String operation(String string){
int index;
double num_1,num_2;
if (string.contains("+")){
index=string.indexOf("+");
num_1= Double.parseDouble(string.substring(0,index));
num_2= Double.parseDouble(string.substring(index+1,string.length()));
return num_1+num_2+"";
}
if (string.contains("-")){
index=string.indexOf("-");
if(index==0){
String string_2=string.substring(1,string.length());
int index_2=string_2.indexOf("-");
num_1= Double.parseDouble(string_2.substring(0,index_2));
num_2= Double.parseDouble(string_2.substring(index_2+1,string_2.length()));
return (-(num_1+num_2))+"";
}else{
num_1= Double.parseDouble(string.substring(0,index));
num_2= Double.parseDouble(string.substring(index+1,string.length()));
return num_1-num_2+"";
}
}
if (string.contains("*")){
index=string.indexOf("*");
num_1= Double.parseDouble(string.substring(0,index));
num_2= Double.parseDouble(string.substring(index+1,string.length()));
return num_1*num_2+"";
}
if (string.contains("/")){
index=string.indexOf("/");
num_1= Double.parseDouble(string.substring(0,index));
num_2= Double.parseDouble(string.substring(index+1,string.length()));
return num_1/num_2+"";
}
return "error!!!";
}
//判断0要不要被替换 看flag的状态 输入数字
private void isflag(String info){
if (flag){
textView.setText(textView.getText()+info);
}else{
if(info.equals(".")||info.equals("+")||info.equals("-")||info.equals("*")||info.equals("/")){
textView.setText(textView.getText()+info);
}else {
textView.setText(info);
}
flag=true;
}
}
}
其余资源没有太大难度，就不一展现了！
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。