本文實(shí)例為大家分享了Android studio實(shí)現(xiàn)簡(jiǎn)單計(jì)算器的具體代碼，供大家參考，具體內(nèi)容如下

需求分析及概要設(shè)計(jì)

目的

開(kāi)發(fā)一個(gè)簡(jiǎn)單的計(jì)算器App,使之能夠完成加減乘除混合運(yùn)算

工具及環(huán)境

使用java語(yǔ)言，在Android studio平臺(tái)上進(jìn)行開(kāi)發(fā)

功能設(shè)計(jì)

“+”:實(shí)現(xiàn)兩數(shù)相加 “-”:實(shí)現(xiàn)兩數(shù)相減 “*”:實(shí)現(xiàn)兩數(shù)相乘 “/”:實(shí)現(xiàn)兩數(shù)相除 “=”:計(jì)算并得出正確結(jié)果 “C”:清屏 “Backspace”:倒退

設(shè)計(jì)思路

1、首先設(shè)計(jì)一個(gè)可視化的界面，供用戶(hù)輸入數(shù)據(jù)并查看結(jié)果。2、用戶(hù)可通過(guò)點(diǎn)擊相應(yīng)按鈕輸入正確的表達(dá)式（注意：這里只實(shí)現(xiàn)對(duì)正確表達(dá)式的計(jì)算處理），最后按'='得出正確結(jié)果。在計(jì)算過(guò)程中可以通過(guò)點(diǎn)擊倒退鍵修改輸入內(nèi)容，在進(jìn)行下一次的運(yùn)算之前必須先進(jìn)行清零操作。3、設(shè)計(jì)好的計(jì)算器應(yīng)可以進(jìn)行加減乘除混合四則運(yùn)算，且可以進(jìn)行小數(shù)和整數(shù)運(yùn)算

詳細(xì)設(shè)計(jì)

當(dāng)用戶(hù)點(diǎn)擊按鈕時(shí)，用SringBuilder變量記錄其輸入的運(yùn)算式，并顯示到文本區(qū)中。

當(dāng)用戶(hù)點(diǎn)擊'='時(shí)，把文本區(qū)的運(yùn)算式拿出來(lái)，首先將它內(nèi)部的一個(gè)一個(gè)字節(jié)拼接成獨(dú)立的運(yùn)算數(shù)和運(yùn)算符，然后存儲(chǔ)在一個(gè)ArrayList數(shù)組中，接著再新建兩個(gè)ArrayList數(shù)組，用來(lái)分別存放運(yùn)算數(shù)和運(yùn)算符，然后遍歷存儲(chǔ)運(yùn)算式的ArrayList數(shù)組，把其中的運(yùn)算數(shù)和運(yùn)算符分別放進(jìn)不同的ArrayList中，每一次放置運(yùn)算符時(shí)，都要先和已存在的運(yùn)算符進(jìn)行比較，若要放進(jìn)的運(yùn)算符優(yōu)先級(jí)低于或等于運(yùn)算符數(shù)組中的運(yùn)算符，則彈出一個(gè)運(yùn)算符，并從運(yùn)算數(shù)數(shù)組中彈出兩個(gè)運(yùn)算數(shù)，然后進(jìn)行運(yùn)算，并把結(jié)果送入運(yùn)算數(shù)數(shù)組中，直到遇到比自己優(yōu)先級(jí)低的運(yùn)算符或運(yùn)算符數(shù)組為空時(shí)，則送入該運(yùn)算符。當(dāng)遍歷到運(yùn)算式末尾時(shí)，依次彈出運(yùn)算符中的運(yùn)算符，并對(duì)應(yīng)彈出運(yùn)算數(shù)進(jìn)行運(yùn)算直到運(yùn)算符數(shù)組為空，此時(shí)運(yùn)算數(shù)數(shù)組中只有一個(gè)數(shù)據(jù)就是最終的結(jié)果

代碼

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(yùn)算式 private ArrayList calculate_equation;//計(jì)算式 private int signal=0;//為0 時(shí)表示剛輸入狀態(tài)；為1 時(shí)表示當(dāng)前在輸出結(jié)果上繼續(xù)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(diǎn)擊文本框時(shí)光標(biāo)始終在文本末尾 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) { //判斷用戶(hù)是否輸入了內(nèi)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(guò)2個(gè)字符 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) { //判斷用戶(hù)是否輸入了內(nèi)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) { //判斷用戶(hù)是否輸入了內(nèi)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) { //判斷用戶(hù)是否輸入了內(nèi)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) { //判斷用戶(hù)是否輸入了內(nèi)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(dāng)API最低版小于21時(shí)使用這個(gè)函數(shù)實(shí)現(xiàn)點(diǎn)擊文本框不彈出鍵盤(pán) 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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?qū)挾群皖伾?--> <stroke android: android:color='#FFFFFF' /></shape>

####結(jié)果分析

啟動(dòng)計(jì)算器并輸入運(yùn)算式“59.0-8/46+2”如下圖：

結(jié)果如下圖：

總結(jié)

這次做計(jì)算器收獲很大，首先我對(duì)Android studio中的布局有了更深刻的認(rèn)識(shí)，其次在這次編程中熟悉了怎么設(shè)置斷點(diǎn)調(diào)試以快速的找出問(wèn)題所在。當(dāng)然，這次的作品也是不夠成熟的，因?yàn)闆](méi)有做有關(guān)錯(cuò)誤表達(dá)式的相應(yīng)處理，因?yàn)闀r(shí)間和精力有限，這次只能先做這么多了

注： 今天沒(méi)事又看了一下這個(gè)代碼，發(fā)現(xiàn)問(wèn)題很多，簡(jiǎn)直是慘不忍睹（希望沒(méi)坑到你們）。比如直接按加、減、乘、除和等號(hào)鍵及后退鍵會(huì)閃退，剛開(kāi)始一直按 “0” 可以一直輸入0，同一個(gè)數(shù)中可以輸入多個(gè)小數(shù)點(diǎn)等等，我感到很慚愧哈，本人能力有限，不過(guò)還是抽時(shí)間又改了一下，修復(fù)了這些bug，另外也優(yōu)化了一些東西，上面貼的代碼我已經(jīng)更新了，GitHub上的源碼我很快也會(huì)更新的，哪里做的不好也希望大家不吝賜教哈 -2018/11/5

鏈接：源代碼下載地址

更多計(jì)算器功能實(shí)現(xiàn)，請(qǐng)點(diǎn)擊專(zhuān)題： 計(jì)算器功能匯總 進(jìn)行學(xué)習(xí)

關(guān)于Android計(jì)算器功能的實(shí)現(xiàn)，查看專(zhuān)題：Android計(jì)算器 進(jìn)行學(xué)習(xí)。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持好吧啦網(wǎng)。