江鸟中原145——计算器实现 原创

大家好，我是江鸟中原鸿蒙展翅，今天给大家展示，计算器是电脑和手机都必不可少的一款软件，今天分享在鸿蒙系统上开发计算器软件。![20210702162006763.png]

先看功能效果:

这里演示了一下加法，该计算器中实现了加减乘除求余，开根号，倒数等所有功能。其他功能的演示这里就不浪费篇幅了。

接下来看界面的设计，这里设计了两种边框主题，一个是显示计算过程和结果的两个Text组件的边框，在graphic文件夹下新建xml文件:

<?xml version=“1.0” encoding=“utf-8”?>
<shape
xmlns:ohos=“http://schemas.huawei.com/res/ohos”
ohos:shape=“rectangle”>
<corners
ohos:radius=“20”
/>
<solid
ohos:color=“#FFffff”/>
<stroke
ohos:color=“#0066FF”
ohos:width=“10”/>
</shape>
再新建一个xml文件，设计按钮的背景样式。

<?xml version=“1.0” encoding=“utf-8”?>
<shape
xmlns:ohos=“http://schemas.huawei.com/res/ohos”
ohos:shape=“rectangle”>
<corners
ohos:radius=“20”
/>
<solid
ohos:color=“#FF5151EC”/>
</shape>
接下来就是计算器的界面搭建的xml代码:

<?xml version=“1.0” encoding=“utf-8”?>
<DirectionalLayout
xmlns:ohos=“http://schemas.huawei.com/res/ohos”
ohos:height=“match_parent”
ohos:width=“match_parent”
ohos:orientation=“vertical”>

<Text
    ohos:height="60fp"
    ohos:width="match_parent"
    ohos:background_element="#00f"
    ohos:padding="10fp"
    ohos:text="计算器"
    ohos:text_alignment="center"
    ohos:text_color="#fff"
    ohos:text_size="30fp"/>

<TableLayout
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:column_count="1"
    ohos:orientation="vertical"
    ohos:padding="10fp"
    ohos:row_count="8">

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:background_element="$graphic:background_textfield"
        ohos:orientation="vertical">
        <Text
            ohos:id="$+id:tv_jsq1"
            ohos:height="40fp"
            ohos:width="match_parent"
            ohos:text_color="#000"
            ohos:hint="请在按键上输入计算的数字"
            ohos:hint_color="#aaa"
            ohos:padding="5fp"
            ohos:text_alignment="vertical_center|right"
            ohos:text_size="20fp"/>

        <Text
            ohos:id="$+id:tv_jsq2"
            ohos:height="40fp"
            ohos:width="match_parent"
            ohos:text_color="#000"
            ohos:hint="请在按键上输入计算的数字"
            ohos:hint_color="#aaa"
            ohos:padding="5fp"
            ohos:text_alignment="vertical_center|right"
            ohos:text_size="25fp"/>
    </DirectionalLayout>

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:alignment="horizontal_center"
        ohos:orientation="horizontal"
        ohos:top_margin="10fp">

        <Button
            ohos:id="$+id:btn_jsq_1"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="MC"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_2"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="MR"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_3"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="MS"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_4"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="M+"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_5"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="-"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>
    </DirectionalLayout>

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:alignment="horizontal_center"
        ohos:orientation="horizontal">

        <Button
            ohos:id="$+id:btn_jsq_6"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="←"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_7"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="CE"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_8"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="C"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_9"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="±"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_10"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="√"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>
    </DirectionalLayout>

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:alignment="horizontal_center"
        ohos:orientation="horizontal">

        <Button
            ohos:id="$+id:btn_jsq_11"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="7"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_12"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="8"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_13"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="9"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_14"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="/"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_15"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="%"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>
    </DirectionalLayout>

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:alignment="horizontal_center"
        ohos:orientation="horizontal">

        <Button
            ohos:id="$+id:btn_jsq_16"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="4"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_17"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="5"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_18"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="6"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_19"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="*"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>

        <Button
            ohos:id="$+id:btn_jsq_20"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="1/X"
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>
    </DirectionalLayout>

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:alignment="center"
        ohos:orientation="horizontal">

        <DirectionalLayout
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:orientation="vertical"
            ohos:weight="5">

            <DirectionalLayout
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:alignment="center"
                ohos:orientation="horizontal">

                <Button
                    ohos:id="$+id:btn_jsq_21"
                    ohos:height="match_content"
                    ohos:width="match_content"
                    ohos:background_element="$graphic:background_button_jsq"
                    ohos:margin="5fp"
                    ohos:padding="10fp"
                    ohos:text="1"
                    ohos:text_color="#fff"
                    ohos:text_size="22fp"
                    ohos:weight="1"/>

                <Button
                    ohos:id="$+id:btn_jsq_22"
                    ohos:height="match_content"
                    ohos:width="match_content"
                    ohos:background_element="$graphic:background_button_jsq"
                    ohos:margin="5fp"
                    ohos:padding="10fp"
                    ohos:text="2"
                    ohos:text_color="#fff"
                    ohos:text_size="22fp"
                    ohos:weight="1"/>

                <Button
                    ohos:id="$+id:btn_jsq_23"
                    ohos:height="match_content"
                    ohos:width="match_content"
                    ohos:background_element="$graphic:background_button_jsq"
                    ohos:margin="5fp"
                    ohos:padding="10fp"
                    ohos:text="3"
                    ohos:text_color="#fff"
                    ohos:text_size="22fp"
                    ohos:weight="1"/>

                <Button
                    ohos:id="$+id:btn_jsq_24"
                    ohos:height="match_content"
                    ohos:width="match_content"
                    ohos:background_element="$graphic:background_button_jsq"
                    ohos:margin="5fp"
                    ohos:padding="10fp"
                    ohos:text="-"
                    ohos:text_color="#fff"
                    ohos:text_size="22fp"
                    ohos:weight="1"/>
            </DirectionalLayout>

            <DirectionalLayout
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:alignment="center"
                ohos:orientation="horizontal">

                <Button
                    ohos:id="$+id:btn_jsq_25"
                    ohos:height="match_content"
                    ohos:width="match_content"
                    ohos:background_element="$graphic:background_button_jsq"
                    ohos:margin="5fp"
                    ohos:padding="10fp"
                    ohos:text="0"
                    ohos:text_color="#fff"
                    ohos:text_size="22fp"
                    ohos:weight="2"/>

                <Button
                    ohos:id="$+id:btn_jsq_26"
                    ohos:height="match_content"
                    ohos:width="match_content"
                    ohos:background_element="$graphic:background_button_jsq"
                    ohos:margin="5fp"
                    ohos:padding="10fp"
                    ohos:text="."
                    ohos:text_color="#fff"
                    ohos:text_size="22fp"
                    ohos:weight="1"/>

                <Button
                    ohos:id="$+id:btn_jsq_27"
                    ohos:height="match_content"
                    ohos:width="match_content"
                    ohos:background_element="$graphic:background_button_jsq"
                    ohos:margin="5fp"
                    ohos:padding="10fp"
                    ohos:text="+"
                    ohos:text_color="#fff"
                    ohos:text_size="22fp"
                    ohos:weight="1"/>
            </DirectionalLayout>
        </DirectionalLayout>

        <Button
            ohos:id="$+id:btn_jsq_28"
            ohos:height="match_parent"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_button_jsq"
            ohos:margin="5fp"
            ohos:padding="10fp"
            ohos:text="="
            ohos:text_color="#fff"
            ohos:text_size="22fp"
            ohos:weight="1"/>
    </DirectionalLayout>
</TableLayout>
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</DirectionalLayout>

整个布局页面中使用了DirectionalLayout(线性布局),TableLayout(表格布局)的综合使用，里面并嵌套使用了Text和Button组件。

接下来就是实现计算功能的java代码了，

package com.example.hm_phone_java.slice;

import com.example.hm_phone_java.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Button;
import ohos.agp.components.Component;
import ohos.agp.components.Text;

public class JSQAbilitySlice extends AbilitySlice {
private int[] ids={
ResourceTable.Id_btn_jsq_1,ResourceTable.Id_btn_jsq_2,
ResourceTable.Id_btn_jsq_3,ResourceTable.Id_btn_jsq_4,
ResourceTable.Id_btn_jsq_5,ResourceTable.Id_btn_jsq_6,
ResourceTable.Id_btn_jsq_7,ResourceTable.Id_btn_jsq_8,
ResourceTable.Id_btn_jsq_9,ResourceTable.Id_btn_jsq_10,
ResourceTable.Id_btn_jsq_11,ResourceTable.Id_btn_jsq_12,
ResourceTable.Id_btn_jsq_13,ResourceTable.Id_btn_jsq_14,
ResourceTable.Id_btn_jsq_15,ResourceTable.Id_btn_jsq_16,
ResourceTable.Id_btn_jsq_17,ResourceTable.Id_btn_jsq_18,
ResourceTable.Id_btn_jsq_19,ResourceTable.Id_btn_jsq_20,
ResourceTable.Id_btn_jsq_21,ResourceTable.Id_btn_jsq_22,
ResourceTable.Id_btn_jsq_23,ResourceTable.Id_btn_jsq_24,
ResourceTable.Id_btn_jsq_25,ResourceTable.Id_btn_jsq_26,
ResourceTable.Id_btn_jsq_27,ResourceTable.Id_btn_jsq_28
};
private Button[] btns=new Button[ids.length];
private boolean firstKey=false;
private Text label,label2;
@Override
protected void onStart(Intent intent) {
super.onStart(intent);
this.setUIContent(ResourceTable.Layout_ability_jsq);
label= (Text) this.findComponentById(ResourceTable.Id_tv_jsq1);
label2= (Text) this.findComponentById(ResourceTable.Id_tv_jsq2);
for (int i = 0; i < ids.length; i++) {
btns[i]= (Button) this.findComponentById(ids[i]);
btns[i].setClickedListener(new Component.ClickedListener() {
@Override
public void onClick(Component component) {
Button button= (Button) component;
String text=button.getText();
if (text.equals(“CE”)) {
// 用户按了"CE"键
label2.setText(“0”);
label.setText(“0”);
firstKey = true;
operator = “=”;
issqrt = true;
} else if (“0123456789.”.indexOf(text) >= 0) {
// 用户按了数字键或者小数点键
handleNumber(text);
// handlezero(zero);
} else {
// 用户按了运算符键
handleOperator(text);
}
}
});
}
}
/**
* 处理数字键被按下的事件
*
* @param key
*/
private void handleNumber(String key) {
if (firstKey) {
// 输入的第一个数字
if ((key.equals(“.”)) && (label2.getText().indexOf(“.”) < 0)) {
label2.setText(label2.getText() + “.”);
} else {
if (key.equals(“.”)) {
label2.setText(“0” + key);
} else {
label2.setText(key);
}
}
} else if ((key.equals(“.”)) && (label2.getText().indexOf(“.”) < 0)) {
// 输入的是小数点，并且之前没有小数点，则将小数点附在结果文本框的后面
label2.setText(label2.getText() + “.”);
} else if (!key.equals(“.”)) {
// 如果输入的不是小数点，则将数字附在结果文本框的后面
label2.setText(label2.getText() + key);
}
// 以后输入的肯定不是第一个数字了
firstKey = false;
}

String operator = "=";
// 是否合法
boolean operateValidFlag = true;
// 计算中间 1+3-2
private double resultNum = 0.0;
private boolean issqrt = true;

/**
 * 处理运算符键被按下的事件
 *
 * @param key
 */
private void handleOperator(String key) {
    if (operator.equals("/")) {
        // 除法运算
        // 如果当前结果文本框中的值等于0
        if (getNumberFromText() == 0.0) {
            // 操作不合法
            operateValidFlag = false;
            label2.setText("除数不能为零");
        } else {
            resultNum /= getNumberFromText();
        }
    } else if (operator.equals("1/X")) {
        // 倒数运算
        if (resultNum == 0.0) {
            // 操作不合法
            operateValidFlag = false;
            label2.setText("零没有倒数");
        } else {
            resultNum = 1 / resultNum;
        }
    } else if (operator.equals("+")) {
        // 加法运算
        resultNum += getNumberFromText();
    } else if (operator.equals("-")) {
        // 减法运算
        resultNum -= getNumberFromText();
    } else if (operator.equals("*")) {
        // 乘法运算
        resultNum *= getNumberFromText();
    } else if (operator.equals("√")) {
        // 平方根运算
        if (resultNum < 0) {
            issqrt = false;
            label2.setText("无效输入");
            resultNum = 0;
        } else {
            resultNum = Math.sqrt(resultNum);
        }

    } else if (operator.equals("%")) {
        // 百分号运算，除以100
        resultNum = resultNum / 100;

    } else if (operator.equals("±")) {
        // 正数负数运算
        resultNum = resultNum * (-1);
    } else if (operator.equals("=")) {
        // 赋值运算
        resultNum = getNumberFromText();

    }
    if (operateValidFlag) {
        // 双精度浮点数的运算
        long t1;
        double t2;
        t1 = (long) resultNum;
        t2 = resultNum - t1;
        if (t2 == 0) {
            if (issqrt) {
                label2.setText(String.valueOf(t1));
            }
            if (key.equals("=")) {
                label.setText("0");
            } else {
                label.setText(label2.getText() + key);
            }
        } else {
            label2.setText(String.valueOf(resultNum));
            if (key.equals("=")) {
                label.setText("0");
            } else {
                label.setText(label2.getText() + key);
            }
        }
    }
    // 运算符等于用户按的按钮
    operator = key;
    firstKey = true;
    operateValidFlag = true;
}

/**
 * 从结果文本框中获取数字
 *
 * @return
 */
private double getNumberFromText() {
    double result = 0;
    try {
        result = Double.valueOf(label2.getText()).doubleValue();
    } catch (NumberFormatException e) {
    }
    return result;
}
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}