本文实例为大家分享了android studio实现简单计算器的具体代码，供大家参考，具体内容如下

1.效果图

2布局代码

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="@drawable/jsj1"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="计算器" android:textSize="20dp" android:gravity="center" android:textColor="#EE4000"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="输入数字"/> <EditText android:id="@+id/ET001" android:layout_width="match_parent" android:layout_height="wrap_content"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="运算结果"/> <EditText android:id="@+id/ET002" android:layout_width="match_parent" android:layout_height="wrap_content"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_marginLeft="5dp" android:id="@+id/btn001" android:layout_width="88dp" android:layout_height="100dp" android:text="C" android:textSize="20dp" android:padding="5dp" android:background="@drawable/qqqqqqqqqq"/> <Button android:id="@+id/btn002" android:layout_width="88dp" android:layout_height="100dp" android:text="÷" android:textSize="20dp" android:padding="5dp" android:background="@drawable/qqqqqqqqqq"/> <Button android:id="@+id/btn003" android:layout_width="88dp" android:layout_height="100dp" android:text="×" android:textSize="20dp" android:padding="5dp" android:background="@drawable/qqqqqqqqqq"/> <Button android:id="@+id/btn004" android:layout_width="88dp" android:layout_height="100dp" android:text="Cx" android:textSize="20dp" android:padding="5dp" android:background="@drawable/qqqqqqqqqq"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_marginLeft="5dp" android:id="@+id/btn005" android:layout_width="88dp" android:layout_height="100dp" android:text="7" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn006" android:layout_width="88dp" android:layout_height="100dp" android:text="8" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn007" android:layout_width="88dp" android:layout_height="100dp" android:text="9" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn008" android:layout_width="88dp" android:layout_height="100dp" android:text="-" android:textSize="20dp" android:padding="5dp" android:background="@drawable/qqqqqqqqqq"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_marginLeft="5dp" android:id="@+id/btn009" android:layout_width="88dp" android:layout_height="100dp" android:text="4" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn0010" android:layout_width="88dp" android:layout_height="100dp" android:text="5" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn0011" android:layout_width="88dp" android:layout_height="100dp" android:text="6" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn0012" android:layout_width="88dp" android:layout_height="100dp" android:text="+" android:textSize="20dp" android:padding="5dp" android:background="@drawable/qqqqqqqqqq"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_marginLeft="5dp" android:id="@+id/btn0013" android:layout_width="88dp" android:layout_height="100dp" android:text="1" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn0014" android:layout_width="88dp" android:layout_height="100dp" android:text="2" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn0015" android:layout_width="88dp" android:layout_height="100dp" android:text="3" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn0019" android:layout_width="88dp" android:layout_height="100dp" android:text="." android:textSize="20dp" android:padding="5dp" android:background="@drawable/qqqqqqqqqq"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_marginLeft="5dp" android:id="@+id/btn0018" android:layout_width="88dp" android:layout_height="100dp" android:text="0" android:textSize="20dp" android:padding="5dp" android:background="@drawable/sssssssssssssss"/> <Button android:id="@+id/btn0016" android:layout_width="265dp" android:layout_height="100dp" android:text="=" android:textSize="20dp" android:padding="5dp" android:background="#6495ED"/> </LinearLayout></LinearLayout>

3.逻辑代码

package com.example.myzhuoye;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;public class JiSuanJi extends AppCompatActivity implements View.OnClickListener { //结果 private EditText ET001,ET002; //数字0-9 private Button btn0018, btn0013,btn0014,btn0015,btn009,btn0010,btn0011,btn005,btn006,btn007; //运算符,+,-,×，÷,.,=;清除,返回 private Button btn0012,btn008,btn003,btn002,btn0019,btn0016,btn001,btn004; private String text = "";//保存输入的数字和符号 private Double result = 0.0;//输出结果 @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout4); //结果 ET001=(EditText)findViewById(R.id.ET001); ET002=(EditText)findViewById(R.id.ET002); //数字0-9 btn0013=(Button)findViewById(R.id.btn0013); btn0014=(Button)findViewById(R.id.btn0014); btn0015=(Button)findViewById(R.id.btn0015); btn009=(Button)findViewById(R.id.btn009); btn0010=(Button)findViewById(R.id.btn0010); btn0011=(Button)findViewById(R.id.btn0011); btn005=(Button)findViewById(R.id.btn005); btn006=(Button)findViewById(R.id.btn006); btn007=(Button)findViewById(R.id.btn007); btn0018=(Button)findViewById(R.id.btn0018); //运算符 btn004=(Button)findViewById(R.id.btn004); btn0012=(Button)findViewById(R.id.btn0012); btn008=(Button)findViewById(R.id.btn008); btn003=(Button)findViewById(R.id.btn003); btn002=(Button)findViewById(R.id.btn002); btn0019=(Button)findViewById(R.id.btn0019); btn0016=(Button)findViewById(R.id.btn0016); btn001=(Button)findViewById(R.id.btn001); //添加点击事件 btn0013.setOnClickListener((View.OnClickListener) this); btn0014.setOnClickListener((View.OnClickListener) this); btn0015.setOnClickListener((View.OnClickListener) this); btn009.setOnClickListener((View.OnClickListener) this); btn0010.setOnClickListener((View.OnClickListener) this); btn0011.setOnClickListener((View.OnClickListener) this); btn005.setOnClickListener((View.OnClickListener) this); btn006.setOnClickListener((View.OnClickListener) this); btn007.setOnClickListener((View.OnClickListener) this); btn0018.setOnClickListener((View.OnClickListener) this); btn0012.setOnClickListener((View.OnClickListener) this); btn008.setOnClickListener((View.OnClickListener) this); btn003.setOnClickListener((View.OnClickListener) this); btn002.setOnClickListener((View.OnClickListener) this); btn0019.setOnClickListener((View.OnClickListener) this); btn0016.setOnClickListener((View.OnClickListener) this); btn001.setOnClickListener((View.OnClickListener) this); btn004.setOnClickListener((View.OnClickListener) this); } @Override public void onClick(View v) { String string=ET001.getText().toString(); switch (v.getId()){ case R.id.btn0018://0 num(0); break; case R.id.btn0013://1 num(1); break; case R.id.btn0014://2 num(2); break; case R.id.btn0015://3 num(3); break; case R.id.btn009://4 num(4); break; case R.id.btn0010://5 num(5); break; case R.id.btn0011://6 num(6); break; case R.id.btn005://7 num(7); break; case R.id.btn006://8 num(8); break; case R.id.btn007://9 num(9); break; case R.id.btn0019://. dot(); break; case R.id.btn0012://+ add(); break; case R.id.btn008://- sub(); break; case R.id.btn003://"*" multiply(); break; case R.id.btn002://除 divide(); break; case R.id.btn001://清除 clear(); break; case R.id.btn004://返回 back(); break; //计算结果 case R.id.btn0016://结果 result(); break; default: break; } ET001.setText(text); ET002.setText(String.valueOf(result)); } private void num(int i) { text = text + String.valueOf(i); } private void dot() { int a=text.length(); String s01="+"; String s02="-"; String s03="×"; String s04="÷"; String s05="."; if (a!=0) { String s=text.substring(a-1,a); String s0=text.substring(0,a-1); if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) { text = s0+"."; }else { text += "."; } } else { text = ""; result =0.0; ET001.setText(""); ET002.setText(""); } } private void clear() { text = ""; result =0.0; ET001.setText(""); ET002.setText(""); } private void back() { if (text.length()!=0){ String str = text.substring(0, text.length()-1); text = str; } ; } private void add() { int a=text.length(); String s01="+"; String s02="-"; String s03="×"; String s04="÷"; String s05="."; if (a!=0) { String s=text.substring(a-1,a); String s0=text.substring(0,a-1); if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) { text = s0+"+"; }else { text += "+"; } } else { text = ""; result =0.0; ET001.setText(""); ET002.setText(""); } } private void sub() { int a=text.length(); String s01="+"; String s02="-"; String s03="×"; String s04="÷"; String s05="."; if (a!=0) { String s=text.substring(a-1,a); String s0=text.substring(0,a-1); if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) { text = s0+"-"; }else { text += "-"; } } else { text = ""; result =0.0; ET001.setText(""); ET002.setText(""); } } private void multiply() { int a=text.length(); String s01="+"; String s02="-"; String s03="×"; String s04="÷"; String s05="."; if (a!=0) { String s=text.substring(a-1,a); String s0=text.substring(0,a-1); if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) { text = s0+"×"; }else { text += "×"; } } else { text = ""; result =0.0; ET001.setText(""); ET002.setText(""); } } private void divide() { int a=text.length(); String s01="+"; String s02="-"; String s03="×"; String s04="÷"; String s05="."; if (a!=0) { String s=text.substring(a-1,a); String s0=text.substring(0,a-1); if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) { text = s0+"÷"; }else { text += "÷"; } } else { text = ""; result =0.0; ET001.setText(""); ET002.setText(""); } } //计算输出结果 private void result() { result = testOperation(text); } public Double testOperation(String s){ //分割字符然后放进数组 String s1 =s.replace("+","-"); String[] str = s1.split("-"); double total1=0; //先遍历数组，把里面的乘除结果算出来 for(String str1:str){ if(str1.contains("×")||str1.contains("÷")){ double total = 0; for(int i =0;i<str1.length();){ int count =1; a:for(int j =i+1;j<str1.length();j++){ char c =str1.charAt(j); if(c=='×'||c=='÷'){ break a; }else{ count++; } } //将数字截取出来 String s2 =str1.substring(i,i+count); double d = Double.parseDouble(s2); if(i==0){ total = d; }else{ char c1 = str1.charAt(i-1); if(c1=='×'){ total*=d; }else if(c1=='÷'){ //如果除数为0，直接返回null; if(d == 0) return null; total/=d; } } i+=count+1; } s= s.replace(str1, total+""); } } //进行加减运算 for(int i =0;i<s.length();i++){ int count =1; a:for(int j=i+1;j<s.length();j++){ char c = s.charAt(j); if(c=='+'||c=='-'){ break a; }else{ count++; } } String s3= s.substring(i,i+count); double d2 = Double.parseDouble(s3); if(i==0){ total1 = d2; }else{ char c = s.charAt(i-1); if(c=='+'){ total1+=d2; }else if(c=='-'){ total1-=d2; } } i+=count; } return total1; }}

4.XML文件

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"> <gradient android:startColor="#c0000000" android:endColor="#c0000000" android:angle="90" /><!--背景颜色渐变 angle为渐变角度--> <solid android:color=" #8DEEEE" /><!-- 背景填充颜色 --> <stroke android:width="0.5dp" android:color="#ff000000" /><!-- 描边，边框宽度、颜色 --> <corners android:radius="0dp" /><!-- 边角圆弧的半径 --> <padding android:left="0dp" android:top="0dp" android:right="0dp" android:bottom="0dp" /><!-- 四周留出来的空白 --></shape><?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"><gradient android:startColor="#c0000000" android:endColor="#c0000000" android:angle="90" /><!--背景颜色渐变 angle为渐变角度--><solid android:color="#00FFFF" /><!-- 背景填充颜色 --><stroke android:width="0.5dp" android:color="#ff000000" /><!-- 描边，边框宽度、颜色 --><corners android:radius="0dp" /><!-- 边角圆弧的半径 --><padding android:left="0dp" android:top="0dp" android:right="0dp" android:bottom="0dp" /><!-- 四周留出来的空白 --></shape>

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