Android?studio開發(fā)怎么實現(xiàn)計算器功能

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前言

android 開發(fā)小實驗
android 移動開發(fā)實現(xiàn) 簡易計算器功能
小白也能輕松上手，復(fù)制粘貼就可使用

使用工具

Android Studio 或者 intellij idea

首先體驗一下結(jié)果

預(yù)覽圖

源碼

前端頁面布局

activity_calculator.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              xmlns:tools="http://schemas.android.com/tools"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:gravity="center"
              android:orientation="vertical"
              android:background="@drawable/bg2"
>   <TextView
        android:layout_width="410dp"
        android:layout_height="60dp"
        android:text="計算器"
        android:textSize="35dp"
        android:gravity="center"
        android:background="#A6EFEF"
        >

    </TextView>
    <TextView
            android:id="@+id/text_show"
            android:layout_width="410dp"
            android:layout_height="80dp"
            android:background="#EAB9B9"
            android:textSize="30dp"
    />

    <EditText
            android:id="@+id/ediText"
            android:layout_width="410dp"
            android:layout_height="70dp"
            android:layout_marginBottom="10dp"
            android:background="#EAB9B9"
            android:editable="false"
            android:gravity="right|center_vertical"
            android:paddingRight="20dp"
            android:hint="請輸入數(shù)字"
            android:textSize="30sp"
    />


    <GridLayout
            android:layout_width="410dp"
            android:layout_height="400dp"
            android:columnCount="5"
            android:rowCount="6">

        <Button
                android:id="@+id/button6"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="←"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/button7"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="CE"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/button8"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="C"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/button9"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="±"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/button10"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="√"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/nine"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="9"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"


        />

        <Button
                android:id="@+id/eight"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="8"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/seven"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="7"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/divider"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="/"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/button15"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="%"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/four"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="4"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/five"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="5"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/six"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="6"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/multiply"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="*"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/button20"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="1/X"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/one"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="1"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/two"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="2"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/three"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="3"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/minus"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="-"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/equal"
                android:layout_width="80dp"
                android:layout_height="100dp"
                android:layout_rowSpan="2"
                android:text="="
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/zero"
                android:layout_width="160dp"
                android:layout_height="wrap_content"
                android:layout_columnSpan="2"
                android:text="0"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/point"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="."
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/add"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="+"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
    </GridLayout>
</LinearLayout>

后端源碼

CalculatorActivity.java

package com.example.myappch6;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class CalculatorActivity extends Activity implements View.OnClickListener{
    //數(shù)字0-9
    Button number_0;
    Button number_1;
    Button number_2;
    Button number_3;
    Button number_4;
    Button number_5;
    Button number_6;
    Button number_7;
    Button number_8;
    Button number_9;

    //運算符
    Button add;         //+
    Button minus;       //-
    Button mul;         //*
    Button divide;      //除
    Button equal;       //=
    Button point;       //小數(shù)點

    //清除
    Button det;

    boolean clean;               //清空標(biāo)識

    EditText editText;           //結(jié)果顯示集

    TextView text_show;          //顯示計算器文本控件

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calculator);
        //數(shù)字0——9實例化
        number_0=findViewById(R.id.zero);
        number_1=findViewById(R.id.one);
        number_2=findViewById(R.id.two);
        number_3=findViewById(R.id.three);
        number_4=findViewById(R.id.four);
        number_5=findViewById(R.id.five);
        number_6=findViewById(R.id.six);
        number_7=findViewById(R.id.seven);
        number_8=findViewById(R.id.eight);
        number_9=findViewById(R.id.nine);

        //運算符實例化
        add=findViewById(R.id.add);        //加
        minus=findViewById(R.id.minus);         //減
        mul=findViewById(R.id.multiply);        //乘
        divide=findViewById(R.id.divider);      //除
        equal=findViewById(R.id.equal);         //等
        point=findViewById(R.id.point);         //小數(shù)點
        det=findViewById(R.id.button8);         //清除

        //結(jié)果顯示集
        text_show = findViewById(R.id.text_show);
        editText=findViewById(R.id.ediText);
//添加事件點擊事件
        // 數(shù)字點擊事件
        number_0.setOnClickListener( this);
        number_1.setOnClickListener(this);
        number_2.setOnClickListener( this);
        number_3.setOnClickListener( this);
        number_4.setOnClickListener(this);
        number_5.setOnClickListener( this);
        number_6.setOnClickListener( this);
        number_7.setOnClickListener(this);
        number_8.setOnClickListener( this);
        number_9.setOnClickListener( this);
        // 符號點擊事件
        add.setOnClickListener( this);
        minus.setOnClickListener( this);
        mul.setOnClickListener( this);
        divide.setOnClickListener( this);
        point.setOnClickListener( this);
        equal.setOnClickListener( this);
        det.setOnClickListener( this);
    }

    //讀取每個按鈕內(nèi)容
    public void onClick(View view){
        //獲取文本內(nèi)容
        String  input=editText.getText().toString();
        switch (view.getId()){
            case R.id.zero:     // 0
            case R.id.one:      // 1
            case R.id.two:      // 2
            case R.id.three:    // 3
            case R.id.four:     // 4
            case R.id.five:     // 5
            case R.id.six:      // 6
            case R.id.seven:    // 7
            case R.id.eight:    // 8
            case R.id.nine:     // 9
            case R.id.point:    //小數(shù)點
                if(clean){
                    clean=false;
                    editText.setText("");   //賦值為空
                }
                editText.setText(input+((Button)view).getText()+"");    //結(jié)果集就是本身
                break;
            case R.id.add:
            case R.id.minus:          // 減
            case R.id.multiply:       // 乘
            case R.id.divider:        // 除
                if(clean){
                    clean=false;
                    input="";
                    editText.setText("");
                }
                editText.setText(input+" "+((Button)view).getText()+" ");
                break;
            case R.id.button8:      //清除
                if(clean){
                    clean=false;
                    input="";
                    editText.setText("");
                }else  if(input!=null || !input.equals("")){
                    //如果獲取內(nèi)容為空
                    editText.setText(input.substring(0,input.length() - 1 ));//結(jié)果集為空
                    break;
                }
                break;
            case  R.id.equal:   //運算結(jié)果=
                getResult();    //調(diào)用處理結(jié)果方法
                break;
        }
    }
//運算結(jié)果方法
    private void getResult(){
        String exp=editText.getText().toString();       //獲取文本框內(nèi)容
        if(exp==null||exp.equals("")){
            return;
        }
        if(!exp.contains("")){
            return;
        }
        if(clean){
            clean=false;
            return;
        }
        clean=true;
        double result=0;
 //進行截取
        // 運算符前的數(shù)字
        String s1=exp.substring(0,exp.indexOf(" "));
        //運算符
        String op=exp.substring(exp.indexOf(" ")+1,exp.indexOf(" ")+2);
        //運算符后的數(shù)字
        String s2=exp.substring(exp.indexOf(" ")+3);

        if(!s1.equals("")&&!s2.equals("")){
            //如果包含小數(shù)點的運算
            double d1=Double.parseDouble(s1);//則數(shù)字都是double類型
            double d2=Double.parseDouble(s2);

            if(op.equals("+")){
                // 如果是+
                result=d1+d2;
                text_show.setText(d1+ "+" +d2+"=");
            }else if(op.equals("-")){
                //如果是-
                result=d1-d2;
                text_show.setText(d1+ "-" +d2+"=");
            }else if(op.equals("*")){
                //如果是*
                result=d1*d2;
                text_show.setText(d1+ "*" +d2+"=");
            }else if(op.equals("/")){
                if(d2==0){
                    //如果被除數(shù)是0
                    result=0;//則結(jié)果為0
                }
                else {
                    //否則執(zhí)行正常運算
                    result=d1/d2;
                    text_show.setText(d1+ "/" +d2+"=");
                }
            }
            if(!s1.contains(".") &&!s2.contains(".")&&!op.equals("/")){
                //如果是整數(shù)類型
                int r=(int)result;//都是整形
                editText.setText(r+"");
            }else {
                editText.setText(result+"");
            }
        }else  if(!s1.equals("")&& s2.equals("")){
            //如果只輸入運算符前的數(shù)字
            editText.setText(exp);//直接返回當(dāng)前輸入內(nèi)容
        }else if (s1.equals("")&& !s2.equals("")){
            //如果是只輸入運算符后面的數(shù)
            double d2 =Double.parseDouble(s2);

            //運算符當(dāng)前沒有輸入數(shù)字
            if(op.equals("+")){
                result= 0 + d2;
                text_show.setText(d2+"=");
            }else  if(op.equals("-")){
                result= 0 - d2;
                text_show.setText(d2+"=");
            }else if (op.equals("*")){
                result= 0;

            }else  if(op.equals("/")){
                result= 0;
            }
            if(!s1.contains(".")&&!s2.contains(".")){
                int r=(int) result;
                editText.setText(r+"");
            }else {
                editText.setText(result+"");
            }
        }else {
            editText.setText("");
        }
    }
}

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