安卓开发的简易计算器

嘛，学习android已经一星期了，第一次做出小软件还是有点小兴奋的。介绍下我的代码吧

其中关于Button和 Listener的声明神马的，还有ListenerEqu 部分来自这里的代码http://blog.csdn.net/nupt123456789/article/details/7832443  非常感谢这位的代码给我的帮助。。 这个小计算器其他部分都是我自己编的- -，可能有点问题。各位跟我一样的初学者就看看就好了~我感觉蛮好懂的，没有什么复杂的调用。

计算器的负数还没弄，就不弄了~看看其他的部分就好了   不说了 贴代码~希望大家多多支持，这是本人安卓开发第一步~

package com.example.calculate1;import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;import java.lang.*;import com.example.calculate1.R.string;public class MainActivity extends Activity {Button btn_num1;Button btn_num2;Button btn_num3;Button btn_num4;Button btn_num5;Button btn_num6;Button btn_num7;Button btn_num8;Button btn_num9;Button btn_num0;Button btnEqu;Button btnAdd;Button btnSub;Button btnMul;Button btnDiv;Button btnPoint;Button btnCln;OnClickListener listener0=null;OnClickListener listener1=null;OnClickListener listener2=null;OnClickListener listener3=null;OnClickListener listener4=null;OnClickListener listener5=null;OnClickListener listener6=null;OnClickListener listener7=null;OnClickListener listener8=null;OnClickListener listener9=null;OnClickListener listenerMul=null;OnClickListener listenerDiv=null;OnClickListener listenerSub=null;OnClickListener listenerAdd=null;OnClickListener listenerPoint=null;OnClickListener listenerCln=null;OnClickListener listenerEqu=null;EditText displayText;double num1=0;double num2=0;double result=0;String myString;int calType = 0;String b;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);displayText=(EditText)findViewById(R.id.text);btn_num0 = (Button)findViewById(R.id.zero);btn_num1 = (Button)findViewById(R.id.one);btn_num2 = (Button)findViewById(R.id.two);btn_num3 = (Button)findViewById(R.id.three);btn_num4 = (Button)findViewById(R.id.four);btn_num5 = (Button)findViewById(R.id.five);btn_num6 = (Button)findViewById(R.id.six);btn_num7 = (Button)findViewById(R.id.seven);btn_num8 = (Button)findViewById(R.id.eight);btn_num9 = (Button)findViewById(R.id.nine);btnAdd = (Button)findViewById(R.id.plus);btnMul = (Button)findViewById(R.id.multiple);btnSub = (Button)findViewById(R.id.subtraction);btnDiv = (Button)findViewById(R.id.division);btnPoint = (Button)findViewById(R.id.point);btnCln = (Button)findViewById(R.id.clean);btnEqu=(Button)findViewById(R.id.equail);listener0 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "0";String b  =myString  ;myString = b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="0";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener1 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "1";String b  =myString  ;myString = b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="1";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener2 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "2";String b  =myString  ;myString = b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="2";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener3 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "3";String b  =myString  ;myString = b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}				 else{String c="3";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener4 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "4";String b  =myString  ;myString = b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="4";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener5 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "5";String b  =myString  ;myString =b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="5";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener6 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "6";String b  =myString  ;myString = b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="6";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener7 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "7";String b  =myString  ;myString =b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="7";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener8 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "8";String b  =myString  ;myString = b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="8";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listener9 = new OnClickListener(){public void onClick(View v){if(num1==0){String a= "9";String b  =myString  ;myString = b+a;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}else{String c="9";String d= myString ;myString =d+c;myString=myString.replaceAll("n","");myString= myString.replaceAll("u","");myString=  myString.replaceAll("l","");}displayText.setText(myString);}};listenerPoint = new OnClickListener(){public void onClick(View v){String b  =myString  ;myString=".";myString = b+myString;displayText.setText(myString);}};listenerAdd = new OnClickListener(){public void onClick(View v){num1=Double.parseDouble(myString);calType=1;myString=null;b=null;}};listenerSub = new OnClickListener(){public void onClick(View v){num1=Double.parseDouble(myString);calType=2;myString=null;b=null;}};listenerMul = new OnClickListener(){public void onClick(View v){num1=Double.parseDouble(myString);calType=3;myString=null;b=null;}};listenerDiv = new OnClickListener(){public void onClick(View v){num1=Double.parseDouble(myString);calType=4;myString=null;b=null;}};listenerEqu = new OnClickListener(){public void onClick(View v){CharSequence temp = displayText.getText();String myString = temp.toString();num2=Double.parseDouble(myString);switch(calType){case 0:result=num2;break;case 1:result=num1+num2;break;case 2:result=num1-num2;break;case 3:result=num1*num2;break;case 4:result=num1/num2;break;default:result=0;break;}String temp_result = String.valueOf(result);displayText.setText(temp_result);myString=null;b=null;}};listenerCln = new OnClickListener(){public void onClick(View v){String temp_result = String.valueOf(result);myString=temp_result;num1=0;num2=0;displayText.setText("0");myString="null";b="null";}};btn_num0.setOnClickListener(listener0);btn_num1.setOnClickListener(listener1);btn_num2.setOnClickListener(listener2);btn_num3.setOnClickListener(listener3);btn_num4.setOnClickListener(listener4);btn_num5.setOnClickListener(listener5);btn_num6.setOnClickListener(listener6);btn_num7.setOnClickListener(listener7);btn_num8.setOnClickListener(listener8);btn_num9.setOnClickListener(listener9);btnAdd.setOnClickListener(listenerAdd);btnSub.setOnClickListener(listenerSub);btnCln.setOnClickListener(listenerCln);btnDiv.setOnClickListener(listenerDiv);btnMul.setOnClickListener(listenerMul);btnPoint.setOnClickListener(listenerPoint);btnEqu.setOnClickListener(listenerEqu);}protected String concat(String myString2, String a) {// TODO Auto-generated method stubreturn null;}@Overridepublic 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;}}

上面的是Activity 下面的是Layout

其中Layout 这面之前用gridView 实验了下  虽然能把按键布置的很好，但是不知道怎么对这些按键进行编辑。所以只能一个个Button编辑

还有之前用了很多replaceAll 是因为 我想要实现可以输入多位数的数字进行计算，用的是字符串相互连接在一起的方法，而myString的初始值是NULL （这东西真烦，搞了我好久） 所以得用replaceAll 吧NULL去掉，差不多就这些吧~如果有点小问题应该也不是很严重~谢谢支持哈

对了 布局用的还不熟练- -    按键的排列可能有点难看  先这样吧~我要开始我的第二个小软件了，哈哈，做安卓软件还是很开心的，很有成就感

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