android计算器

1、效果预览

2、项目布局

3、main.xml文件内容

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    android:background="@drawable/anyouhui12210750213ebc1b8a1"    >    <View     android:layout_height="8sp"    android:layout_width="fill_parent"    /><EditText     android:id="@+id/myEdit"    android:layout_width="fill_parent"        android:layout_height="70sp"        android:inputType="text"        android:enabled="false"        android:text="0"        android:textSize="25sp"        android:textColor="#000000"            /><View     android:layout_height="10sp"    android:layout_width="fill_parent"    /><LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <ImageView         android:layout_width="65sp"        android:layout_height="57sp"        android:src="@drawable/at"        />    <Button         android:id="@+id/back"    android:layout_width="125sp"        android:layout_height="wrap_content"        android:text="Back "        android:textSize="30sp"        />    <Button         android:id="@+id/tuibu"    android:layout_width="125sp"        android:layout_height="wrap_content"        android:text="←"        android:textSize="30sp"        />    </LinearLayout><LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <Button         android:id="@+id/a7"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="7"        android:textSize="30sp"        />    <Button         android:id="@+id/a8"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="8"        android:textSize="30sp"        />    <Button         android:id="@+id/a9"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="9"        android:textSize="30sp"        />    <Button         android:id="@+id/zuokuohao"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="("        android:textSize="30sp"        />    <Button         android:id="@+id/youkuohao"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text=")"        android:textSize="30sp"        /></LinearLayout>    <LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <Button         android:id="@+id/a4"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="4"        android:textSize="30sp"        />    <Button         android:id="@+id/a5"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="5"        android:textSize="30sp"        />    <Button         android:id="@+id/a6"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="6"        android:textSize="30sp"        />    <Button         android:id="@+id/jia"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="+"        android:textSize="30sp"        />    <Button         android:id="@+id/cheng"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="×"        android:textSize="30sp"        /></LinearLayout> <LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <Button         android:id="@+id/a1"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="1"        android:textSize="30sp"        />    <Button         android:id="@+id/a2"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="2"        android:textSize="30sp"        />    <Button         android:id="@+id/a3"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="3"        android:textSize="30sp"        />    <Button         android:id="@+id/jian"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="-"        android:textSize="30sp"        />    <Button         android:id="@+id/chu"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="÷"        android:textSize="30sp"        /></LinearLayout><LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <Button         android:id="@+id/ax"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="√"        android:textSize="30sp"        />    <Button         android:id="@+id/a0"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="0"        android:textSize="30sp"        />    <Button         android:id="@+id/dian"    android:layout_width="63sp"        android:layout_height="wrap_content"        android:text="·"        android:textSize="30sp"        />    <Button         android:id="@+id/deng"    android:layout_width="125sp"        android:layout_height="wrap_content"        android:text="="        android:textSize="30sp"        />            </LinearLayout><LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <ImageView         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:src="@drawable/acmb"        /></LinearLayout></LinearLayout>

4、MainActivity.java文件

package com.example.jsq;import java.math.BigDecimal;import java.util.HashMap;import java.util.Stack;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity {private EditText edit=null;private Button but1=null;private Button but2=null;private Button but3=null;private Button but4=null;private Button but5=null;private Button but6=null;private Button but7=null;private Button but8=null;private Button but9=null;private Button but0=null;private Button butJia=null;private Button butJian=null;private Button butCheng=null;private Button butChu=null;private Button butDian=null;private Button butZuo=null;private Button butYou=null;private Button butTui=null;private Button butBack=null;private Button butx=null;private Button butDeng=null;static boolean ok=false;static String jieguo="";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.main);this.edit=(EditText)super.findViewById(R.id.myEdit);this.but0=(Button)super.findViewById(R.id.a0);this.but1=(Button)super.findViewById(R.id.a1);this.but2=(Button)super.findViewById(R.id.a2);this.but3=(Button)super.findViewById(R.id.a3);this.but4=(Button)super.findViewById(R.id.a4);this.but5=(Button)super.findViewById(R.id.a5);this.but6=(Button)super.findViewById(R.id.a6);this.but7=(Button)super.findViewById(R.id.a7);this.but8=(Button)super.findViewById(R.id.a8);this.but9=(Button)super.findViewById(R.id.a9);this.butJia=(Button)super.findViewById(R.id.jia);this.butJian=(Button)super.findViewById(R.id.jian);this.butCheng=(Button)super.findViewById(R.id.cheng);this.butChu=(Button)super.findViewById(R.id.chu);this.butZuo=(Button)super.findViewById(R.id.zuokuohao);this.butYou=(Button)super.findViewById(R.id.youkuohao);this.butTui=(Button)super.findViewById(R.id.tuibu);this.butBack=(Button)super.findViewById(R.id.back);this.butx=(Button)super.findViewById(R.id.ax);this.butDeng=(Button)super.findViewById(R.id.deng);this.butDian=(Button)super.findViewById(R.id.dian);this.but0.setOnClickListener(new Ja0());this.but1.setOnClickListener(new Ja1());this.but2.setOnClickListener(new Ja2());this.but3.setOnClickListener(new Ja3());this.but4.setOnClickListener(new Ja4());this.but5.setOnClickListener(new Ja5());this.but6.setOnClickListener(new Ja6());this.but7.setOnClickListener(new Ja7());this.but8.setOnClickListener(new Ja8());this.but9.setOnClickListener(new Ja9());this.butZuo.setOnClickListener(new JaZuo());this.butYou.setOnClickListener(new JaYou());this.butDian.setOnClickListener(new JaDian());this.butJia.setOnClickListener(new Jia());this.butJian.setOnClickListener(new Jian());this.butCheng.setOnClickListener(new cheng());this.butChu.setOnClickListener(new chu());this.butDeng.setOnClickListener(new deng());this.butx.setOnClickListener(new jax());this.butTui.setOnClickListener(new tui());this.butBack.setOnClickListener(new back());}private class jax implements OnClickListener{@Overridepublic void onClick(View arg0) {if(MainActivity.this.edit.getText().toString().equals(""))return;if(ok){MainActivity.this.edit.setText(jieguo);ok=false;}String s=MainActivity.this.edit.getText().toString()+"=";//text1.setText("√("+text1.getText()+")=");s=s.replace("×", "*");s=s.replace("÷", "/");qiuzhi(s);//MainActivity.deng.this.qiuzhi(s);jieguo=Math.sqrt(Double.parseDouble(jieguo))+"";jieguo=huajian(jieguo);MainActivity.this.edit.setText("√("+MainActivity.this.edit.getText()+")="+jieguo);ok=true;}}private class back implements OnClickListener{@Overridepublic void onClick(View arg0) {MainActivity.this.edit.setText("0");ok=false;}}private class tui implements OnClickListener{@Overridepublic void onClick(View arg0) {String str=MainActivity.this.edit.getText().toString();MainActivity.this.edit.setText(str.substring(0, str.length()-1<0?0: str.length()-1));}}private class Ja0 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("0");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"0");}}}private class Ja1 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("1");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"1");}}}private class Ja2 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("2");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"2");}}}private class Ja3 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("3");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"3");}}}private class Ja4 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("4");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"4");}}}private class Ja5 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("5");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"5");}}}private class Ja6 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("6");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"6");}}}private class Ja7 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("7");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"7");}}}private class Ja8 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("8");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"8");}}}private class Ja9 implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("9");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"9");}}}private class JaDian implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+".");}}private class JaYou implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+")");}}private class JaZuo implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText("0");ok=false;}if(MainActivity.this.edit.getText().toString().equals("0")){MainActivity.this.edit.setText("(");}else{MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"(");}}}private class Jia implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText(jieguo);ok=false;}MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"+");}}private class Jian implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText(jieguo);ok=false;}MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"-");}}private class cheng implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText(jieguo);ok=false;}MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"x");}}private class chu implements OnClickListener{@Overridepublic void onClick(View arg0) {if(ok){MainActivity.this.edit.setText(jieguo);ok=false;}MainActivity.this.edit.setText(MainActivity.this.edit.getText().toString()+"÷");}}private class deng implements OnClickListener{@Overridepublic void onClick(View arg0) {try {String s=MainActivity.this.edit.getText().toString()+"=";String s1=s;MainActivity.this.edit.setText(s);s=s.replace("x", "*");s=s.replace("÷", "/");qiuzhi(s);MainActivity.this.edit.setText(s1+jieguo);ok=true;} catch (Exception e1) {MainActivity.this.edit.setText("式子不合法");ok=true;e1.printStackTrace();}}}public void qiuzhi(String s) {HashMap<Character,Integer> map=new HashMap<Character,Integer>();//存运算符的优先级Stack<BigDecimal> sk1=new Stack<BigDecimal>();//存数字Stack<Character> sk2=new Stack<Character>();//存运算符map=SUM(map);boolean okk=true;int x=0;for(int i=0;i<s.length();i++){char a=s.charAt(i);if((a>='0'&&a<='9'||a=='.')&&okk){x=i;okk=false;}else if(!(a>='0'&&a<='9'||a=='.')){//是运算符//System.out.println(s.substring(x, i));if(i>0&&s.charAt(i-1)<='9'&&s.charAt(i-1)>='0')//防止两个运算符一块，1*(..)sk1.push(new BigDecimal(s.substring(x, i)));//将数字部分变成浮点型okk=true;if(sk2.isEmpty()){//运算符栈是空，运算符直接进栈sk2.push(a);}else{//运算符栈不为空if(map.get(sk2.peek())<map.get(a)){//如果来的运算符优先级较高，直接进栈sk2.push(a);continue;}while(!sk2.isEmpty()&&(map.get(sk2.peek())>=map.get(a)&&sk2.peek()!='(')){//运算符栈不为空，且来的运算符级别较低，switch(sk2.pop()){//最后进的运算符出栈，执行运算case '+':{BigDecimal c=sk1.pop();//数字栈后进的两个数字出栈开始运算，然后再进栈BigDecimal d=sk1.pop();c=c.add(d);sk1.push(c);break;}case '-':{BigDecimal c=sk1.pop();BigDecimal d=sk1.pop();c=d.subtract(c);sk1.push(c);break;}case '*':{BigDecimal c=sk1.pop();BigDecimal d=sk1.pop();c=c.multiply(d);sk1.push(c);break;}case '/':{BigDecimal c=sk1.pop();BigDecimal d=sk1.pop();c=d.divide(c, 100, BigDecimal.ROUND_HALF_UP);sk1.push(c);break;}}}if(!sk2.isEmpty()&&sk2.peek()=='('&&a==')'){//消除运算之后的无意义括号sk2.pop();}elsesk2.push(a);//其他来的运算符继续进栈}}}jieguo=sk1.pop().toPlainString();jieguo=huajian(jieguo);}private String huajian(String j) {if(j.indexOf(".")!=-1){for(int i=j.length()-1;i>=0;i--){if(j.endsWith("0")){j=j.substring(0,j.length()-1);}elsebreak;}}if(j.endsWith(".")){j=j.substring(0,j.length()-1);}return j;}private HashMap<Character, Integer> SUM(HashMap<Character, Integer> map) {map.put('=', 1);map.put(')', 2);map.put('+', 3);map.put('-', 3);map.put('*', 4);map.put('/', 4);map.put('(', 5);return map;}@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;}}

项目下载---请到资源页面下载