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
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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
4.XML文件
<&#63;xml version="1.0" encoding="utf-8"&#63;>
<&#63;xml version="1.0" encoding="utf-8"&#63;>
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