利用Android studio设计一个计算器_android studio 计算器

作者：Monodyee | 2024-04-16 04:21:27

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android studio 计算器

利用Android studio设计一个计算器

计算器界面

在这里插入图片描述

项目结构

在这里插入图片描述
其中activity_main.xml文件为计算器的界面，shape_screen.xml为计算器显示器的图形，button1_presssed.xml为按键按压下的图形，button1_nomal.xml为按键未被按压下的图形，button1_shape.xml是为了凸显按键按下和弹起时呈现不同效果的文件。其余的文件类似。

布局文件

activity_main.xml如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#000000"
tools:context="com.example.calculator.MainActivity">  


  <TextView  //计算器显示屏                                                            
    android:id="@+id/calculator_screen"
    android:layout_width="match_parent"
    android:layout_height="170dp"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="10dp"
    android:background="@drawable/shape_screen"
    android:gravity="right|bottom"
    android:hint="0"
    android:paddingRight="5dp"
    android:textColor="#000000"
    android:textSize="50sp"/>


   //各按键

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:orientation="vertical"
    android:gravity="center_horizontal|center_vertical">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">

    <Button
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:text="%"
        android:background="@drawable/button1_shape"
        android:textSize="40sp"
        android:id="@+id/button_percent"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="5dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="5dp"/>
    <Button
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:text="÷"
        android:background="@drawable/button1_shape"
        android:textSize="45sp"
        android:id="@+id/button_divide"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="5dp"/>
    <Button
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="@drawable/button1_shape"
        android:text="×"
        android:textSize="45sp"
        android:id="@+id/button_multiply"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="5dp"/>
    <Button
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:text="C"
        android:background="@drawable/button2_shape"
        android:textSize="40sp"
        android:id="@+id/button_clear"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="5dp"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">

        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="7"
            android:textSize="40sp"
            android:background="@drawable/button3_shape"
            android:id="@+id/button_7"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="8"
            android:background="@drawable/button3_shape"
            android:textSize="40sp"
            android:id="@+id/button_8"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="9"
            android:background="@drawable/button3_shape"
            android:textSize="40sp"
            android:id="@+id/button_9"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="+"
            android:background="@drawable/button2_shape"
            android:textSize="40sp"
            android:id="@+id/button_add"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">

        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="4"
            android:textSize="40sp"
            android:background="@drawable/button3_shape"
            android:id="@+id/button_4"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="5"
            android:background="@drawable/button3_shape"
            android:textSize="40sp"
            android:id="@+id/button_5"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="6"
            android:background="@drawable/button3_shape"
            android:textSize="40sp"
            android:id="@+id/button_6"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="-"
            android:background="@drawable/button2_shape"
            android:textSize="50sp"
            android:id="@+id/button_minus"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">


        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:background="@drawable/button3_shape"
            android:text="1"
            android:textSize="40sp"
            android:id="@+id/button_1"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:background="@drawable/button3_shape"
            android:text="2"
            android:textSize="40sp"
            android:id="@+id/button_2"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:background="@drawable/button3_shape"
            android:text="3"
            android:textSize="40sp"
            android:id="@+id/button_3"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:background="@drawable/button2_shape"
            android:text="√"
            android:textSize="40sp"
            android:id="@+id/button_radic"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"/>


    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">

        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:background="@drawable/button3_shape"
            android:text="0"
            android:textSize="40sp"
            android:id="@+id/button_0"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="10dp"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:background="@drawable/button3_shape"
            android:text="."
            android:textSize="45sp"
            android:id="@+id/button_dot"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="10dp"/>


        <Button
            android:layout_width="160dp"
            android:layout_height="80dp"
            android:background="@drawable/button4_shape"
            android:text="="
            android:textSize="45sp"
            android:id="@+id/button_equal"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="10dp"/>

       </LinearLayout>
    </LinearLayout>
</LinearLayout>
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button1_nomal.xml如下：

 <?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval"
android:useLevel="false">

<solid android:color="#c0c0c0"/>


<size
    android:width="30dp"
    android:height="30dp">

</size>

<padding
    android:bottom="10dp"
    android:left="10dp"
    android:right="10dp"
    android:top="10dp">

</padding>
<stroke android:width="1dp"
    android:color="#000000">//描边

</stroke>

</shape>
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button1_pressed.xml如下：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval"
android:useLevel="false">

<solid android:color="#ffffff"/>


<size
    android:width="30dp"
    android:height="30dp">

</size>

<padding
    android:bottom="10dp"
    android:left="10dp"
    android:right="10dp"
    android:top="10dp">

</padding>
<stroke android:width="1dp"
    android:color="#000000">//描边

</stroke>

</shape>
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button1_shape.xml如下：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/button1_pressed"/>
<item android:drawable="@drawable/button1_nomal"/>
</selector>
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代码文件

MainActivity.java如下：

package com.example.calculator;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.app.Activity;
import android.widget.TextView;
import android.widget.Toast;

 public class MainActivity extends Activity  {
   private TextView calculator_monitor;
     private Button   but_0,but_1,but_2,but_3,but_4,but_5,but_6,but_7,but_8,but_9,but_clear,but_divide,
        but_multiply,but_add,but_minus,but_radic,but_dot,but_equal,but_percent;
  double num1=0,num2=0;
  double result=0;//Calculation results
   int operation=0;//Operands

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    calculator_monitor=(TextView)findViewById(R.id.calculator_screen);
    but_0=(Button)findViewById(R.id.button_0);
    but_1=(Button)findViewById(R.id.button_1);
    but_2=(Button)findViewById(R.id.button_2);
    but_3=(Button)findViewById(R.id.button_3);
    but_4=(Button)findViewById(R.id.button_4);
    but_5=(Button)findViewById(R.id.button_5);
    but_6=(Button)findViewById(R.id.button_6);
    but_7=(Button)findViewById(R.id.button_7);
    but_8=(Button)findViewById(R.id.button_8);
    but_9=(Button)findViewById(R.id.button_9);
    but_add=(Button)findViewById(R.id.button_add);
    but_clear=(Button)findViewById(R.id.button_clear);
    but_divide=(Button)findViewById(R.id.button_divide);
    but_dot=(Button)findViewById(R.id.button_dot);
    but_equal=(Button)findViewById(R.id.button_equal);
    but_minus=(Button)findViewById(R.id.button_minus);
    but_multiply=(Button)findViewById(R.id.button_multiply);
    but_radic=(Button)findViewById(R.id.button_radic);
    but_percent=(Button)findViewById(R.id.button_percent);


    but_0.setOnClickListener(new MyOnClickListener());//加监视器
    but_1.setOnClickListener(new MyOnClickListener());
    but_2.setOnClickListener(new MyOnClickListener());
    but_3.setOnClickListener(new MyOnClickListener());
    but_4.setOnClickListener(new MyOnClickListener());
    but_5.setOnClickListener(new MyOnClickListener());
    but_6.setOnClickListener(new MyOnClickListener());
    but_7.setOnClickListener(new MyOnClickListener());
    but_8.setOnClickListener(new MyOnClickListener());
    but_9.setOnClickListener(new MyOnClickListener());
    but_clear.setOnClickListener(new MyOnClickListener());
    but_divide.setOnClickListener(new MyOnClickListener());
    but_minus.setOnClickListener(new MyOnClickListener());
    but_add.setOnClickListener(new MyOnClickListener());
    but_equal.setOnClickListener(new MyOnClickListener());
    but_multiply.setOnClickListener(new MyOnClickListener());
    but_dot.setOnClickListener(new MyOnClickListener());
    but_radic.setOnClickListener(new MyOnClickListener());
    but_percent.setOnClickListener(new MyOnClickListener());

}
class MyOnClickListener implements  View.OnClickListener{
    public void onClick(View v){//点击事件的处理方法
        switch (v.getId()){
            case R.id.button_clear:
                calculator_monitor.setText(null);
                break;
            case R.id.button_0:
                String str0=calculator_monitor.getText().toString();//获取输入的内容并转换为string型
                str0+="0";
                calculator_monitor.setText(str0);
                break;
            case R.id.button_1:
                String str1=calculator_monitor.getText().toString();
                str1+="1";
                calculator_monitor.setText(str1);
                break;
            case R.id.button_2:
                String str2=calculator_monitor.getText().toString();
                str2+="2";
                calculator_monitor.setText(str2);
                break;
            case R.id.button_3:
                String str3=calculator_monitor.getText().toString();
                str3+="3";
                calculator_monitor.setText(str3);
                break;
            case R.id.button_4:
                String str4=calculator_monitor.getText().toString();
                str4+="4";
                calculator_monitor.setText(str4);
                break;
            case R.id.button_5:
                String str5=calculator_monitor.getText().toString();
                str5+="5";
                calculator_monitor.setText(str5);
                break;
            case R.id.button_6:
                String str6=calculator_monitor.getText().toString();
                str6+="6";
                calculator_monitor.setText(str6);
                break;
            case R.id.button_7:
                String str7=calculator_monitor.getText().toString();
                str7+="7";
                calculator_monitor.setText(str7);
                break;
            case R.id.button_8:
                String str8=calculator_monitor.getText().toString();
                str8+="8";
                calculator_monitor.setText(str8);
                break;
            case R.id.button_9:
                String str9=calculator_monitor.getText().toString();
                str9+="9";
                calculator_monitor.setText(str9);
                break;
            case R.id.button_dot:
                String strdot=calculator_monitor.getText().toString();
                strdot+=".";
                calculator_monitor.setText(strdot);
                break;
            case R.id.button_add:
                String stradd=calculator_monitor.getText().toString();
                if(stradd.equals(null)){
                    return;
                }
                num1=Double.valueOf(stradd);
                stradd+="+";
                calculator_monitor.setText(null);
                operation=1;
                break;
            case R.id.button_minus:
                String strminus=calculator_monitor.getText().toString();
                if(strminus.equals(null)){
                    return;
                }
                num1=Double.valueOf(strminus);
                strminus+="-";
                calculator_monitor.setText(null);
                operation=2;
                break;
            case R.id.button_multiply:
                String strmultiply=calculator_monitor.getText().toString();
                if(strmultiply.equals(null)){
                    return;
                }
                num1=Double.valueOf(strmultiply);
                strmultiply+="*";
                calculator_monitor.setText(null);
                operation=3;
                break;
            case R.id.button_divide:
                String strdivide=calculator_monitor.getText().toString();
                if(strdivide.equals(null)){
                    return;
                }
                num1=Double.valueOf(strdivide);
                strdivide+="/";
                calculator_monitor.setText(null);
                operation=4;
                break;
            case R.id.button_percent:
                String strpercent=calculator_monitor.getText().toString();
                if(strpercent.equals(null)){
                    return;
                }
                num1=Double.valueOf(strpercent);
                strpercent+="%";
                operation=5;
                break;



            case R.id.button_equal:
                String strequ=calculator_monitor.getText().toString();
                num2=Double.valueOf(strequ);
                // calculator_monitor.setText(null);
                switch (operation){
                    case 1:
                        result=num1+num2;
                        calculator_monitor.setText(String.valueOf(num1)+"+"+String.valueOf(num2)+"="+String.valueOf(result));
                        break;
                    case 2:
                        result=num1-num2;
                        calculator_monitor.setText(String.valueOf(num1)+"-"+String.valueOf(num2)+"="+String.valueOf(result));
                        break;
                    case 3:
                        result=num1*num2;
                        calculator_monitor.setText(String.valueOf(num1)+"×"+String.valueOf(num2)+"="+String.valueOf(result));
                        break;
                    case 4:
                        if(num2==0){
                            calculator_monitor.setText("被除数不能为0！");


                        }
                        else {
                            result = num1 / num2;
                            calculator_monitor.setText(String.valueOf(num1) + "÷" + String.valueOf(num2) + "=" + String.valueOf(result));
                        }
                        break;
                    case 5:
                        result=num1/100;
                        calculator_monitor.setText(String.valueOf(num1) + "%" +"="+String.valueOf(result));
                        break;

                    default:
                        result=0;
                        break;
                }
        }

     }
  }
}
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结果示例

在这里插入图片描述

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