eclipse安卓开发计算器代码

Eclipse是一款集成开发环境（IDE），常用于开发Java应用程序，也可以用于开发安卓应用。在Eclipse环境中开发安卓应用程序，需要安装Android Development Tools (ADT)插件，使Eclipse获得安卓应用的开发能力。下面将介绍如何在Eclipse中使用ADT插件，实现开发一个简单的安卓计算器应用程序。

1. 安装ADT插件

首先需要从Eclipse的官网上下载最新版本的Eclipse IDE for Java Developers。然后从Eclipse的菜单栏中选择Help > Eclipse Marketplace，在Marketplace中搜索“ADT”插件，点击安装按钮，跟随提示完成安装过程。

2. 创建安卓项目

安装完ADT插件后，就可以在Eclipse中创建一个安卓项目。选择File > New > Other，在弹出的New窗口中选择Android > Android Project，点击Next按钮，然后填写应用程序的信息。需要指定应用程序的名称、包名和目标安卓版本等信息。在Create Activity对话框中，选择创建一个空白的Activity，命名为MainActivity。点击Finish按钮，完成安卓项目的创建。

3. 编写布局文件

在创建的安卓项目中，res/layout文件夹中会自动生成一个activity_main.xml布局文件，该文件用来定义应用程序的界面。打开该布局文件，添加一些按钮和TextView控件，构建出简单的计算器界面。该布局文件的代码如下：

```

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

android:paddingBottom="@dimen/activity_vertical_margin"

tools:context=".MainActivity">

android:id="@+id/result"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="32sp"

android:layout_alignParentTop="true"

android:layout_alignParentRight="true"

android:text="0"

android:textColor="#000000" />

android:id="@+id/button1"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/result"

android:layout_alignParentLeft="true"

android:text="1" />

android:id="@+id/button2"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/result"

android:layout_toRightOf="@id/button1"

android:text="2" />

android:id="@+id/button3"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/result"

android:layout_toRightOf="@id/button2"

android:text="3" />

android:id="@+id/button4"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/button1"

android:layout_alignParentLeft="true"

android:text="4" />

android:id="@+id/button5"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/button2"

android:layout_toRightOf="@id/button4"

android:text="5" />

android:id="@+id/button6"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/button3"

android:layout_toRightOf="@id/button5"

android:text="6" />

android:id="@+id/button7"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/button4"

android:layout_alignParentLeft="true"

android:text="7" />

android:id="@+id/button8"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/button5"

android:layout_toRightOf="@id/button7"

android:text="8" />

android:id="@+id/button9"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/button6"

android:layout_toRightOf="@id/button8"

android:text="9" />

android:id="@+id/button0"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_below="@id/button7"

android:layout_alignParentLeft="true"

android:text="0" />

android:id="@+id/buttonAdd"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_alignBaseline="@id/button0"

android:layout_toRightOf="@id/button0"

android:text="+" />

android:id="@+id/buttonSubtract"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_alignBaseline="@id/buttonAdd"

android:layout_toRightOf="@id/buttonAdd"

android:text="-" />

android:id="@+id/buttonMultiply"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_alignBaseline="@id/buttonSubtract"

android:layout_toRightOf="@id/buttonSubtract"

android:text="*" />

android:id="@+id/buttonDivide"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_alignBaseline="@id/buttonMultiply"

android:layout_toRightOf="@id/buttonMultiply"

android:text="/" />

android:id="@+id/buttonEqual"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_alignBaseline="@id/buttonDivide"

android:layout_toRightOf="@id/buttonDivide"

android:text="=" />

android:id="@+id/buttonClear"

android:layout_width="100dp"

android:layout_height="80dp"

android:textSize="26sp"

android:layout_alignBaseline="@id/buttonEqual"

android:layout_toRightOf="@id/buttonEqual"

android:text="C" />

```

4. 编写Java代码

安卓应用程序的逻辑代码主要实现在MainActivity.java文件中。在该文件中，需要定义各个按钮的点击事件，并将结果显示在TextView控件中。MainActivity.java文件的代码如下：

```

package com.example.calculator;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

TextView result;

String numberOne = "";

String numberTwo = "";

String operator = "";

double resultNumber = 0.0;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

result = (TextView) findViewById(R.id.result);

Button button1 = (Button) findViewById(R.id.button1);

Button button2 = (Button) findViewById(R.id.button2);

Button button3 = (Button) findViewById(R.id.button3);

Button button4 = (Button) findViewById(R.id.button4);

Button button5 = (Button) findViewById(R.id.button5);

Button button6 = (Button) findViewById(R.id.button6);

Button button7 = (Button) findViewById(R.id.button7);

Button button8 = (Button) findViewById(R.id.button8);

Button button9 = (Button) findViewById(R.id.button9);

Button button0 = (Button) findViewById(R.id.button0);

Button buttonAdd = (Button) findViewById(R.id.buttonAdd);

Button buttonSubtract = (Button) findViewById(R.id.buttonSubtract);

Button buttonMultiply = (Button) findViewById(R.id.buttonMultiply);

Button buttonDivide = (Button) findViewById(R.id.buttonDivide);

Button buttonEqual = (Button) findViewById(R.id.buttonEqual);

Button buttonClear = (Button) findViewById(R.id.buttonClear);

button1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

if (operator.isEmpty()) {

numberOne += "1";

result.setText(numberOne);

} else {

numberTwo += "1";

result.setText(numberTwo);

}

}

});

button2.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

if (operator.isEmpty()) {

numberOne += "2";

result.setText(numberOne);

} else {

numberTwo += "2";

result.setText(numberTwo);

}

}

});

button3.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

if (operator.isEmpty()) {

numberOne += "3";

result.setText(numberOne);

} else {

numberTwo += "3";

result.setText(numberTwo);

}

}

});

button4.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

if (operator.isEmpty()) {

numberOne += "4";

result.setText(numberOne);

} else {

numberTwo += "4";

result.setText(numberTwo);

}

}

});

button5.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

if (operator.isEmpty()) {

numberOne += "5";

result.setText(numberOne);

} else {

numberTwo += "5";

result.setText(numberTwo);

}

}

});

button6.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

if (operator.isEmpty()) {

numberOne += "6";

result.setText(numberOne);

} else {

numberTwo += "6";

result.setText(numberTwo);

}

}

});

button7.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

if (operator.isEmpty()) {

numberOne += "7";

result.setText(numberOne);

} else {

numberTwo += "7";

result.setText(numberTwo);

}

}

});

button8.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

if (operator.isEmpty()) {

numberOne += "8";

result.setText(numberOne);

} else {

numberTwo += "8";

result.setText(numberTwo);

}