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：

<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" tools:context="com.example.calculator.MainActivity" > <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <EditText android:id="@+id/et_show" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="请输入数字" /> <ImageView 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" > </ImageView> </RelativeLayout> <GridLayout 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" > <Button android:id="@+id/bt_1" android:layout_height="wrap_content" android:text="1" /> <Button android:id="@+id/bt_2" android:text="2" /> <Button android:id="@+id/bt_3" android:text="3" /> <Button android:id="@+id/bt_div" android:text="/" /> <Button android:id="@+id/bt_4" android:text="4" /> <Button android:id="@+id/bt_5" android:text="5" /> <Button android:id="@+id/bt_6" android:text="6" /> <Button android:id="@+id/bt_mutilate" android:text="X" /> <Button android:id="@+id/bt_7" android:text="7" /> <Button android:id="@+id/bt_8" android:text="8" /> <Button android:id="@+id/bt_9" android:text="9" /> <Button android:id="@+id/bt_sub" android:text="-" /> <Button android:id="@+id/bt_0" android:layout_columnSpan="2" android:layout_gravity="fill_horizontal" android:text="0" android:width="2dp" /> <Button android:id="@+id/bt_c" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="C" /> <Button android:id="@+id/bt_plus" android:layout_gravity="fill_vertical" android:layout_rowSpan="2" android:text="+" /> <Button android:id="@+id/bt_equ" android:layout_columnSpan="3" android:layout_gravity="fill_horizontal" android:text="=" /> </GridLayout> <TextView android:id="@+id/author" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Author:Bri" /> <TextView android:id="@+id/test" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="test:" /></LinearLayout>

我还写了一个drawable的xml，自己看吧

delete_and_deletegray.xml：

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/delete_gray" android:state_focused="false" android:state_pressed="false"></item> <item android:drawable="@drawable/delete" android:state_focused="false" android:state_pressed="false" android:state_selected="true"/> <item android:drawable="@drawable/delete" android:state_pressed="true" android:state_selected="false"/> <item android:drawable="@drawable/delete" android:state_focused="true" android:state_pressed="true"/></selector>

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：

在线一元函数（方程）求解计算工具：
http://tools.jb51.net/jisuanqi/equ_jisuanqi

科学计算器在线使用_高级计算器在线计算：
http://tools.jb51.net/jisuanqi/jsqkexue

在线计算器_标准计算器：
http://tools.jb51.net/jisuanqi/jsq

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android开发入门与进阶教程》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。