本文实例讲述了Android开发实现的简单计算器功能。分享给大家供大家参考，具体如下：

这个Android计算器虽然还有点小bug，不过简单的计算功能还是没问题的哦；

先上图看效果

比较简单，所以我就没怎么写注释，应该一看就能明白的

有不明白的可以发信问我

先贴MainActivity.java代码

package com.example.calculator;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

Button b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, bp, bs, bm, bd, bc, be;

ImageView delete;

TextView tv;

EditText show;

String showString = "", option = "";

int showfirst = 0;

String exception = "";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

b0 = (Button) findViewById(R.id.bt_0);

b1 = (Button) findViewById(R.id.bt_1);

b2 = (Button) findViewById(R.id.bt_2);

b3 = (Button) findViewById(R.id.bt_3);

b4 = (Button) findViewById(R.id.bt_4);

b5 = (Button) findViewById(R.id.bt_5);

b6 = (Button) findViewById(R.id.bt_6);

b7 = (Button) findViewById(R.id.bt_7);

b8 = (Button) findViewById(R.id.bt_8);

b9 = (Button) findViewById(R.id.bt_9);

bp = (Button) findViewById(R.id.bt_plus);

bs = (Button) findViewById(R.id.bt_sub);

bm = (Button) findViewById(R.id.bt_mutilate);

bd = (Button) findViewById(R.id.bt_div);

bc = (Button) findViewById(R.id.bt_c);

be = (Button) findViewById(R.id.bt_equ);

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);

b0.setOnClickListener(this);

bp.setOnClickListener(this);

bs.setOnClickListener(this);

bm.setOnClickListener(this);

bd.setOnClickListener(this);

bc.setOnClickListener(this);

be.setOnClickListener(this);

show = (EditText) findViewById(R.id.et_show);

delete = (ImageView) findViewById(R.id.iv_delete);

delete.setOnClickListener(this);

tv=(TextView) findViewById(R.id.author);

tv.setOnClickListener(this);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.bt_0:

showString += "0";

break;

case R.id.bt_1:

showString += "1";

break;

case R.id.bt_2:

showString += "2";

break;

case R.id.bt_3:

showString += "3";

break;

case R.id.bt_4:

showString += "4";

break;

case R.id.bt_5:

showString += "5";

break;

case R.id.bt_6:

showString += "6";

break;

case R.id.bt_7:

showString += "7";

break;

case R.id.bt_8:

showString += "8";

break;

case R.id.bt_9:

showString += "9";

break;

case R.id.bt_plus:

if (showString.equals(""))

exception = "先输入数值哦";

else {

showfirst = Integer.parseInt(showString);

showString = "";

option = "+";

}

break;

case R.id.bt_sub:

if (showString.equals(""))

exception = "先输入数值哦";

else {

showfirst = Integer.parseInt(showString);

showString = "";

option = "-";

}

break;

case R.id.bt_mutilate:

if (showString.equals(""))

exception = "先输入数值哦";

else {

showfirst = Integer.parseInt(showString);

showString = "";

option = "*";

}

break;

case R.id.bt_div:

if (showString.equals(""))

exception = "先输入数值哦";

else {

showfirst = Integer.parseInt(showString);

showString = "";

option = "/";

}

break;

case R.id.bt_equ:

if (option.equals("+"))

showString = showfirst + Integer.parseInt(showString) + "";

else if (option.equals("-")) {

showString = showfirst - Integer.parseInt(showString) + "";

} else if (option.equals("*")) {

showString = showfirst * Integer.parseInt(showString) + "";

} else if (option.equals("/")) {

if (showString.equals("0")) {

exception = "除数不能为0！";

} else

showString = showfirst / Integer.parseInt(showString) + "";

}

break;

case R.id.bt_c:

showString = "";

break;

case R.id.iv_delete:

Toast.makeText(MainActivity.this, showString + "已被清空",

Toast.LENGTH_SHORT).show();

showString = "";

break;

case R.id.author:

Toast.makeText(MainActivity.this, "郑明亮\n软件工程\nQQ：1072307340",

Toast.LENGTH_SHORT).show();

break;

default:

break;

}

if (exception.equals(""))

show.setText(showString);

else {

show.setText(exception);

exception = "";

}

// 设置文本框颜色；

if (!show.getText().toString().equals("")) {

delete.setBackgroundColor(R.drawable.delete_gray);

}

else {

delete.setBackgroundResource(R.drawable.delete);

}

}

}

再贴布局activity_main.xml：

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context="com.example.calculator.MainActivity" >

android:layout_width="match_parent"

android:layout_height="wrap_content" >

android:id="@+id/et_show"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:hint="请输入数字" />

android:id="@+id/iv_delete"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignRight="@id/et_show"

android:src="@drawable/delete_and_deletegray" >

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/et_show"

android:focusable="false"

android:gravity="center"

android:layout_marginTop="25dp"

android:columnCount="4"

android:horizontalSpacing="0dp"

android:orientation="horizontal"

android:stretchMode="none" >

android:id="@+id/bt_1"

android:layout_height="wrap_content"

android:text="1" />

android:id="@+id/bt_2"

android:text="2" />

android:id="@+id/bt_3"

android:text="3" />

android:id="@+id/bt_div"

android:text="/" />

android:id="@+id/bt_4"

android:text="4" />

android:id="@+id/bt_5"

android:text="5" />

android:id="@+id/bt_6"

android:text="6" />

android:id="@+id/bt_mutilate"

android:text="X" />

android:id="@+id/bt_7"

android:text="7" />

android:id="@+id/bt_8"

android:text="8" />

android:id="@+id/bt_9"

android:text="9" />

android:id="@+id/bt_sub"

android:text="-" />

android:id="@+id/bt_0"

android:layout_columnSpan="2"

android:layout_gravity="fill_horizontal"

android:text="0"

android:width="2dp" />

android:id="@+id/bt_c"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="C" />

android:id="@+id/bt_plus"

android:layout_gravity="fill_vertical"

android:layout_rowSpan="2"

android:text="+" />

android:id="@+id/bt_equ"

android:layout_columnSpan="3"

android:layout_gravity="fill_horizontal"

android:text="=" />

android:id="@+id/author"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Author:Bri"

/>

android:id="@+id/test"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="test:www.jb51.net"

/>

我还写了一个drawable的xml，自己看吧

delete_and_deletegray.xml：

附：完整实例代码点击此处本站下载。

PS：这里再为大家推荐几款计算工具供大家进一步参考借鉴：

希望本文所述对大家Android程序设计有所帮助。