Android studio實現簡單的計算器
本文例項為大家分享了Android studio實現簡單計算器的具體程式碼,供大家參考,具體內容如下
需求分析及概要設計
目的
開發一個簡單的計算器App,使之能夠完成加減乘除混合運算
工具及環境
使用java語言,在Android studio平臺上進行開發
功能設計
- “+”:實現兩數相加
- “-”:實現兩數相減
- “*”:實現兩數相乘
- “/”:實現兩數相除
- “=”:計算並得出正確結果
- “C”:清屏
- “Backspace”:倒退
設計思路
1、首先設計一個視覺化的介面,供使用者輸入資料並檢視結果。
2、使用者可通過點選相應按鈕輸入正確的表示式(注意:這裡只實現對正確表示式的計算處理),最後按"="得出正確結果。在計算過程中可以通過點選倒退鍵修改輸入內容,在進行下一次的運算之前必須先進行清零操作。
詳細設計
當用戶點選按鈕時,用SringBuilder變數記錄其輸入的運算式,並顯示到文字區中。
當用戶點選"="時,把文字區的運算式拿出來,首先將它內部的一個一個位元組拼接成獨立的運算數和運算子,然後儲存在一個ArrayList陣列中,接著再新建兩個ArrayList陣列,用來分別存放運算數和運算子,然後遍歷儲存運算式的ArrayList陣列,把其中的運算數和運算子分別放進不同的ArrayList中,每一次放置運算子時,都要先和已存在的運算子進行比較,若要放進的運算子優先順序低於或等於運算子陣列中的運算子,則彈出一個運算子,並從運算數陣列中彈出兩個運算數,然後進行運算,並把結果送入運算數陣列中,直到遇到比自己優先順序低的運算子或運算子陣列為空時,則送入該運算子。當遍歷到運算式末尾時,依次彈出運算子中的運算子,並對應彈出運算數進行運算直到運算子陣列為空,此時運算數陣列中只有一個數據就是最終的結果
程式碼
MainAcivity.java
package com.example.qw.calculator; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; import java.lang.reflect.Method; import java.math.BigDecimal; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity{ private StringBuilder show_equation=new StringBuilder();//顯示運算式 private ArrayList calculate_equation;//計算式 private int signal=0;//為0 時表示剛輸入狀態;為1 時表示當前在輸出結果上繼續輸入 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化 show_equation=new StringBuilder(); calculate_equation=new ArrayList<>(); Button zero=(Button)findViewById(R.id.zero); Button one=(Button)findViewById(R.id.one); Button two=(Button)findViewById(R.id.two); Button three=(Button)findViewById(R.id.three); Button four=(Button)findViewById(R.id.four); Button five=(Button)findViewById(R.id.five); Button six=(Button)findViewById(R.id.six); Button seven=(Button)findViewById(R.id.seven); Button eight=(Button)findViewById(R.id.eight); Button nine=(Button)findViewById(R.id.nine); Button cls=(Button)findViewById(R.id.cls); Button div=(Button)findViewById(R.id.div); Button mul=(Button)findViewById(R.id.mul); Button backspace=(Button)findViewById(R.id.Backspace); Button sub=(Button)findViewById(R.id.sub); Button add=(Button)findViewById(R.id.add); final Button equal=(Button)findViewById(R.id.equal); final Button point=(Button)findViewById(R.id.spot); final EditText result=(EditText)findViewById(R.id.result); result.setCursorVisible(true); disableShowInput(result); //點選文字框時游標始終在文字末尾 result.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { result.setSelection(result.getText().length()); } }); zero.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v){ if(!(show_equation.toString().equals("0"))){ if(signal==0){ show_equation.append("0"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("0"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } } }); one.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("1"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("1"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); two.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("2"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("2"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); three.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("3"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("3"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); four.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("4"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("4"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); five.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("5"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("5"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); six.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("6"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("6"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); seven.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("7"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("7"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); eight.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("8"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("8"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); nine.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ show_equation.append("9"); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); show_equation.append("9"); result.setText(show_equation); result.setSelection(result.getText().length()); signal=0; } } }); cls.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { show_equation.delete(0,show_equation.length()); calculate_equation.clear(); signal=0; result.setText(""); } }); backspace.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(!(show_equation.toString().equals(""))) { if(signal==0){ show_equation.deleteCharAt(show_equation.length() - 1); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ show_equation.delete(0,show_equation.length()); result.setText(""); signal=0; } } } }); point.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(signal==0){ String a=show_equation.toString(); if(a.equals("")){ show_equation.append("."); result.setText(show_equation); result.setSelection(result.getText().length()); }else{ int i; char t='0'; for(i=a.length();i>0;i--){ t=a.charAt(i-1); if(t=='.'||t=='+'||t=='-'||t=='*'||t=='/') break; } if(i==0){ show_equation.append("."); result.setText(show_equation); result.setSelection(result.getText().length()); }else if(t=='+'||t=='-'||t=='*'||t=='/'){ show_equation.append("."); result.setText(show_equation); result.setSelection(result.getText().length()); } } }else{ show_equation.delete(0,show_equation.length()); show_equation.append("."); result.setText("."); result.setSelection(result.getText().length()); signal=0; } } }); equal.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //判斷使用者是否輸入了內容 if(!show_equation.toString().equals("")){ signal=1; char temp=show_equation.charAt(show_equation.length()-1); if(show_equation.charAt(0)=='-') show_equation.insert(0,"0"); if(temp=='+'||temp=='-') show_equation.append("0"); if(temp=='*'||temp=='/') show_equation.append("1"); StringBuilder temp1=new StringBuilder(); for(int i=0;i<show_equation.length();i++){ if(show_equation.charAt(i)>='0'&&show_equation.charAt(i)<='9'||show_equation.charAt(i)=='.'){ temp1.append(String.valueOf(show_equation.charAt(i))); }else if(show_equation.charAt(i)=='N'){ calculate_equation.add("NaN"); //跳過2個字元 i=i+2; }else if(show_equation.charAt(i)=='∞'){ calculate_equation.add("∞"); } else { if(temp1.length()!=0){ calculate_equation.add(temp1.toString()); temp1.delete(0,temp1.length()); } calculate_equation.add(String.valueOf(show_equation.charAt(i))); } } if(temp1.length()!=0){ calculate_equation.add(temp1.toString()); } calculate_equation.add("#"); String temp8=calculate(calculate_equation); result.setText(temp8); result.setSelection(result.getText().length()); show_equation.delete(0,show_equation.length()); calculate_equation.clear(); show_equation.append(temp8); } } }); add.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //判斷使用者是否輸入了內容 if(!(show_equation.toString().equals(""))) { signal=0; char temp=show_equation.charAt(show_equation.length()-1); if(temp=='+'||temp=='-'||temp=='*'||temp=='/') { show_equation.deleteCharAt(show_equation.length()-1); show_equation.append("+"); } else show_equation.append("+"); result.setText(show_equation); result.setSelection(result.getText().length()); } } }); sub.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //判斷使用者是否輸入了內容 if(!(show_equation.toString().equals(""))) { signal=0; char temp=show_equation.charAt(show_equation.length()-1); if(temp=='+'||temp=='-'||temp=='*'||temp=='/') { show_equation.deleteCharAt(show_equation.length()-1); show_equation.append("-"); } else show_equation.append("-"); result.setText(show_equation); result.setSelection(result.getText().length()); } } }); mul.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //判斷使用者是否輸入了內容 if(!(show_equation.toString().equals(""))) { signal=0; char temp=show_equation.charAt(show_equation.length()-1); if(temp=='+'||temp=='-'||temp=='*'||temp=='/') { show_equation.deleteCharAt(show_equation.length()-1); show_equation.append("*"); } else show_equation.append("*"); result.setText(show_equation); result.setSelection(result.getText().length()); } } }); div.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //判斷使用者是否輸入了內容 if(!(show_equation.toString().equals(""))) { signal=0; char temp=show_equation.charAt(show_equation.length()-1); if(temp=='+'||temp=='-'||temp=='*'||temp=='/') { show_equation.deleteCharAt(show_equation.length()-1); show_equation.append("/"); } else show_equation.append("/"); result.setText(show_equation); result.setSelection(result.getText().length()); } } }); } protected boolean operatorPriorityCompare(char operator1,char operator2) { int o1=0; int o2=0; switch (operator1){ case '+':{o1=0;break;} case '-':{o1=0;break;} case '*':{o1=1;break;} case '/':{o1=1;break;} } switch (operator2){ case '+':{o2=0;break;} case '-':{o2=0;break;} case '*':{o2=1;break;} case '/':{o2=1;break;} } if(o1<=o2) { return false; } else return true; } //相加 public static Double Add(Double d1,Double d2) { if(d1==Double.NEGATIVE_INFINITY||d1==Double.POSITIVE_INFINITY||d2==Double.NEGATIVE_INFINITY||d2==Double.POSITIVE_INFINITY){ return d1+d2; } if(String.valueOf(d1).equals("NaN")||String.valueOf(d1).equals("NaN")){ return d1+d2; } BigDecimal b1 = new BigDecimal(Double.toString(d1)); BigDecimal b2 = new BigDecimal(Double.toString(d2)); return b1.add(b2).doubleValue(); } //相減 public static Double Sub(Double d1,Double d2){ if(d1==Double.NEGATIVE_INFINITY||d1==Double.POSITIVE_INFINITY||d2==Double.NEGATIVE_INFINITY||d2==Double.POSITIVE_INFINITY){ return d1-d2; } if(String.valueOf(d1).equals("NaN")||String.valueOf(d1).equals("NaN")){ return d1-d2; } if(String.valueOf(d1).equals("NaN")||String.valueOf(d1).equals("NaN")){ return d1*d2; } BigDecimal b1=new BigDecimal(Double.toString(d1)); BigDecimal b2=new BigDecimal(Double.toString(d2)); return b1.subtract(b2).doubleValue(); } //相乘 public static Double Mul(Double d1,Double d2){ if(d1==Double.NEGATIVE_INFINITY||d1==Double.POSITIVE_INFINITY||d2==Double.NEGATIVE_INFINITY||d2==Double.POSITIVE_INFINITY){ return d1*d2; } if(String.valueOf(d1).equals("NaN")||String.valueOf(d1).equals("NaN")){ return d1*d2; } BigDecimal b1=new BigDecimal(Double.toString(d1)); BigDecimal b2=new BigDecimal(Double.toString(d2)); return b1.multiply(b2).setScale(8).doubleValue(); } //相除 public static Double Div(Double d1,Double d2){ if(d1==Double.NEGATIVE_INFINITY||d1==Double.POSITIVE_INFINITY||d2==Double.NEGATIVE_INFINITY||d2==Double.POSITIVE_INFINITY){ return d1/d2; } if(String.valueOf(d1).equals("NaN")||String.valueOf(d1).equals("NaN")){ return d1/d2; } if(d1==0.0&&d2==0.0){ return Double.NaN; } if(d2==0.0){ return d1/d2; } BigDecimal b1=new BigDecimal(Double.toString(d1)); BigDecimal b2=new BigDecimal(Double.toString(d2)); return b1.divide(b2,8,BigDecimal.ROUND_HALF_UP).doubleValue(); } protected String calculate(ArrayList equation){ Double temp2; Double temp3; Double result; List operator=new ArrayList(); List<Double> operand=new ArrayList(); for(int i=0;i<equation.size();i++) { String temp4=(String) equation.get(i); if(temp4.equals("+")||temp4.equals("-")||temp4.equals("*")||temp4.equals("/")) { if(operator.size()>0) { String temp5=operator.get(operator.size()-1).toString(); while(!(operatorPriorityCompare(temp4.charAt(0),temp5.charAt(0)))&&operator.size()>0) { operator.remove(operator.size()-1); temp3=operand.get(operand.size()-1); operand.remove(operand.size()-1); temp2=operand.get(operand.size()-1); operand.remove(operand.size()-1); switch (temp5.charAt(0)){ case '+':{result=Add(temp2,temp3);operand.add(result);break;} case '-':{result=Sub(temp2,temp3);operand.add(result);break;} case '*':{result=Mul(temp2,temp3);operand.add(result);break;} case '/':{result=Div(temp2,temp3);operand.add(result);break;} } if(operator.size()>0) { temp5=operator.get(operator.size()-1).toString(); } else break; } operator.add(temp4); } else operator.add(temp4); } else if(temp4.equals("#")) { while(operator.size()>0) { String temp6=(String)operator.get(operator.size()-1); operator.remove(operator.size()-1); temp3=operand.get(operand.size()-1); operand.remove(operand.size()-1); temp2=operand.get(operand.size()-1); operand.remove(operand.size()-1); switch (temp6.charAt(0)){ case '+':{result=Add(temp2,temp3);operand.add(result);break;} case '-':{result=Sub(temp2,temp3);operand.add(result);break;} case '*':{result=Mul(temp2,temp3);operand.add(result);break;} case '/':{result=Div(temp2,temp3);operand.add(result);break;} } } } else { if(temp4.equals("NaN")){ operand.add(Double.NaN); }else if(temp4.equals("∞")){ operand.add(Double.POSITIVE_INFINITY); }else{ operand.add(Double.parseDouble(temp4)); } } } if(operand.get(0)==Double.NEGATIVE_INFINITY) return "-∞"; if(operand.get(0)==Double.POSITIVE_INFINITY) return "∞"; return operand.get(0).toString(); } //當API最低版小於21時使用這個函式實現點選文字框不彈出鍵盤 public void disableShowInput(EditText et) { Class<EditText> cls = EditText.class; Method method; try { method = cls.getMethod("setShowSoftInputOnFocus",boolean.class); method.setAccessible(true); method.invoke(et,false); } catch (Exception e) { e.printStackTrace(); } } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <EditText android:id="@+id/result" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="40sp" android:enabled="false"/> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal"> <Button android:id="@+id/cls" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="C" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/div" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="/" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/mul" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="*" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/Backspace" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="Backspace" android:textAllCaps="false" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal"> <Button android:id="@+id/seven" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="7" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/eight" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="8" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/nine" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="9" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/sub" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="-" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal"> <Button android:id="@+id/four" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="4" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/five" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="5" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/six" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="6" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/add" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="+" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="2" android:orientation="horizontal"> <LinearLayout android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="1dp" android:layout_weight="1" android:orientation="horizontal"> <Button android:id="@+id/one" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="1" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/two" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:textSize="20sp" android:text="2" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="1dp" android:layout_weight="1"> <Button android:id="@+id/zero" android:layout_width="match_parent" android:layout_height="match_parent" android:text="0" android:textSize="20sp" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> </LinearLayout> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:orientation="horizontal"> <LinearLayout android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:orientation="vertical"> <Button android:id="@+id/three" android:layout_width="match_parent" android:layout_height="1dp" android:layout_weight="1" android:text="3" android:textSize="20sp" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> <Button android:id="@+id/spot" android:layout_width="match_parent" android:layout_height="1dp" android:layout_weight="1" android:text="." android:textSize="20sp" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1"> <Button android:id="@+id/equal" android:layout_width="match_parent" android:layout_height="match_parent" android:text="=" android:textSize="20sp" android:background="@drawable/buttonstytle" android:textColor="#ffffff"/> </LinearLayout> </LinearLayout> </LinearLayout> </LinearLayout>
buttonstytle.xml
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" > <!-- 主體背景顏色值 --> <solid android:color="#666666" /> <!-- 連框寬度和顏色值 --> <stroke android:width="0.01dp" android:color="#FFFFFF" /> </shape>
####結果分析
啟動計算器並輸入運算式“59.0-8/46+2”如下圖:
結果如下圖:
總結
這次做計算器收穫很大,首先我對Android studio中的佈局有了更深刻的認識,其次在這次程式設計中熟悉了怎麼設定斷點除錯以快速的找出問題所在。當然,這次的作品也是不夠成熟的,因為沒有做有關錯誤表示式的相應處理,因為時間和精力有限,這次只能先做這麼多了
注: 今天沒事又看了一下這個程式碼,發現問題很多,簡直是慘不忍睹(希望沒坑到你們)。比如直接按加、減、乘、除和等號鍵及後退鍵會閃退,剛開始一直按 “0” 可以一直輸入0,同一個數中可以輸入多個小數點等等,我感到很慚愧哈,本人能力有限,不過還是抽時間又改了一下,修復了這些bug,另外也優化了一些東西,上面貼的程式碼我已經更新了,GitHub上的原始碼我很快也會更新的,哪裡做的不好也希望大家不吝賜教哈 -2018/11/5
連結:原始碼下載地址
更多計算器功能實現,請點選專題: 計算器功能彙總 進行學習
關於Android計算器功能的實現,檢視專題:Android計算器 進行學習。
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