本文实例为大家分享了Android实现简易的计算器的具体代码，供大家参考，具体内容如下

布局(activity_main.xml)

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/GridLayout1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:columnCount="4"

android:orientation="horizontal"

android:rowCount="6" >

android:id="@+id/editText"

android:layout_columnSpan="4"

android:layout_gravity="fill"

android:layout_marginLeft="5dp"

android:layout_marginRight="5dp"

android:text="0"

android:textSize="50sp" />

android:id="@+id/clear"

android:layout_columnSpan="1"

android:layout_gravity="fill"

android:text="清空"

android:textColor="#FF4500"

/>

android:id="@+id/back"

android:layout_columnSpan="1"

android:layout_gravity="fill"

android:text="回退"

android:textColor="#FF4500"

/>

android:id="@+id/per"

android:text="%"

android:textColor="#FF4500"

/>

android:id="@+id/div"

android:text="÷"

android:textColor="#FF4500"

/>

android:id="@+id/b7"

android:text="7"

/>

android:id="@+id/b8"

android:text="8"

/>

android:id="@+id/b9"

android:text="9"

/>

android:id="@+id/mul"

android:text="×"

android:textColor="#FF4500"

/>

android:id="@+id/b4"

android:text="4"

/>

android:id="@+id/b5"

android:text="5"

/>

android:id="@+id/b6"

android:text="6"

/>

android:id="@+id/sub"

android:text="-"

android:textColor="#FF4500"

/>

android:id="@+id/b1"

android:text="1"

/>

android:id="@+id/b2"

android:text="2"

/>

android:id="@+id/b3"

android:text="3"

/>

android:id="@+id/plus"

android:layout_width="wrap_content"

android:text="+"

android:textColor="#FF4500"

/>

android:id="@+id/b00"

android:text="00"

/>

android:id="@+id/b0"

android:text="0"

/>

android:id="@+id/dot"

android:text="."

/>

android:id="@+id/equ"

android:text="="

android:background="#008B8B"

/>

响应及计算(MainActivity)

package com.mylayout;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private EditText editText;

//数字0-9

private Button b1;

private Button b2;

private Button b3;

private Button b4;

private Button b5;

private Button b6;

private Button b7;

private Button b8;

private Button b9;

private Button b0;

private Button b00;

//运算符

private Button per;

private Button add;// +

private Button sub; // -

private Button mul; // *

private Button div; // /

private Button dot; //小数点

private Button equ; // =

private boolean back; //退格

private boolean clear_bool= true;//清空

private boolean dot_flag1 = true;

private boolean dot_flag2 = true;

@Override

public void onClick(View view) {

String input = editText.getText().toString();

switch (view.getId()){

case R.id.b0:

case R.id.b1:

case R.id.b2:

case R.id.b3:

case R.id.b4:

case R.id.b5:

case R.id.b6:

case R.id.b7:

case R.id.b8:

case R.id.b9:

case R.id.b00:

if(dot_flag1)dot_flag2 = true;

if(clear_bool)

{

clear_bool = false;

editText.setText(""+((Button)view).getText());

}

else

{

editText.setText(input + ((Button)view).getText());//结果集就为本身

}

break;

case R.id.dot:

if(dot_flag1&&dot_flag2)

{

dot_flag1 = false;

dot_flag2 = false;

editText.setText(input + ((Button)view).getText());

}

break;

case R.id.per:

case R.id.plus:

case R.id.sub:

case R.id.mul:

case R.id.div:

dot_flag1 = true;

if(clear_bool)

{

clear_bool = false;

input = "";

editText.setText("");

}

editText.setText(input + ((Button)view).getText()+" ");

break;

case R.id.back: //退格

if(input != null || !input.equals("")) {

if(input.length()>1) {

editText.setText(input.substring(0, input.length() - 1));//

}

else{

clear_bool =true;

editText.setText("0");

}

}

break;

case R.id.clear: //清空

editText.setText("0");

clear_bool = true;

break;

case R.id.equ:

calculation();

break;

}

}

//计算结果

private void calculation() {

String s1 = editText.getText().toString(); //获取字符串

if (s1 == null){

return;

}

boolean flag = false;

if(s1.charAt(0)=='-')

{

s1 = s1.substring(1);

flag = true;

}

String []num = s1.split("[-÷×+]"); //分割字符串获得各个数字

double []n = new double[num.length];

for(int i=0;i

{

if(num[i].equals(""))continue;

//百分号

else if(num[i].contains("%")) n[i] = Double.parseDouble(num[i].replace("%",""))/100;

//开根

// else if(num[i].contains("√")) n[i] = Math.sqrt(Double.parseDouble(num[i].replace("√", "")));

else n[i] = Double.parseDouble(num[i]);

}

if(flag) n[0] -= n[0]*2; //负数情况

char[] sy = s1.replaceAll("[^-÷×+]","").toCharArray(); //获得运算符

int slen = sy.length;

if(sy.length == num.length)slen--;

char c = '+';

double result = n[0] ; //结果

if(n.length>1)

{

for (int j = 0; j < slen; j++) //先算乘除

{

if (sy[j] == '×')

{

n[j + 1] = n[j] * n[j + 1];

n[j] = 0;

if (c == '+') sy[j] = '+'; //判断乘除的前一个运算符是什么

else sy[j] = '-';

}

else if (sy[j] == '÷')

{

if (n[j + 1] != 0) n[j + 1] = n[j] / n[j + 1];

else n[j + 1] = 0;

n[j] = 0;

if (c == '+') sy[j] = '+';

else sy[j] = '-';

} else

c = sy[j];

}

result = n[0];

for (int j = 0; j < slen; j++) { //求和

if (sy[j] == '+') result += n[j + 1];

if (sy[j] == '-') result -= n[j + 1];

}

}

if((int)result == result )editText.setText((int)result+""); //显示

else

{ //控制输出小数点后6位

result = Double.parseDouble(String.format("%.6f", result));

editText.setText(result+"");

}

}

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//获取id

View b1 = findViewById(R.id.b1);

View b2 = findViewById(R.id.b2);

View b3= findViewById(R.id.b3);

View b4 = findViewById(R.id.b4);

View b5 = findViewById(R.id.b5);

View b6 = findViewById(R.id.b6);

View b7 = findViewById(R.id.b7);

View b8 = findViewById(R.id.b8);

View b9 = findViewById(R.id.b9);

View b0 = findViewById(R.id.b0);

View b00 = findViewById(R.id.b00);

//运算符

View plus = findViewById(R.id.plus);// +

View sub = findViewById(R.id.sub);// -

View mul = findViewById(R.id.mul);// *

View per = findViewById(R.id.per); // %

View div = findViewById(R.id.div); // /

View dot = findViewById(R.id.dot);//小数点

View equ = findViewById(R.id.equ);//=

View clear = findViewById(R.id.clear);//清空

View back = findViewById(R.id.back); //回退

editText = (EditText) findViewById(R.id.editText);//结果集

//添加监听事件

b0.setOnClickListener(this);

b1.setOnClickListener(this);

b2.setOnClickListener(this);

b3.setOnClickListener(this);

b4.setOnClickListener(this);

b5.setOnClickListener(this);

b6.setOnClickListener(this);

b7.setOnClickListener(this);

b8.setOnClickListener(this);

b9.setOnClickListener(this);

b00.setOnClickListener(this);

per.setOnClickListener(this);

plus.setOnClickListener(this);

sub.setOnClickListener(this);

mul.setOnClickListener(this);

div.setOnClickListener(this);

dot.setOnClickListener(this);

equ.setOnClickListener(this);

clear.setOnClickListener(this);

back.setOnClickListener(this);

}

}

测试

关于计算器的精彩文章请查看《计算器专题》 ，更多精彩等你来发现！

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