Android实现简易的计算器

本文实例为大家分享了Android实现简易的计算器的具体代码，供大家参考，具体内容如下

布局(activity_main.xml)

<GridLayout xmlns:android='http://schemas.android.com/apk/res/android' xmlns:tools='http://schemas.android.com/tools' android: android:layout_width='wrap_content' android:layout_height='wrap_content' android:columnCount='4' android:orientation='horizontal' android:rowCount='6' > <EditText android: android:layout_columnSpan='4' android:layout_gravity='fill' android:layout_marginLeft='5dp' android:layout_marginRight='5dp' android:text='0' android:textSize='50sp' /> <Button android: android:layout_columnSpan='1' android:layout_gravity='fill' android:text='清空' android:textColor='#FF4500' /> <Button android: android:layout_columnSpan='1' android:layout_gravity='fill' android:text='回退' android:textColor='#FF4500' /> <Button android: android:text='%' android:textColor='#FF4500' /> <Button android: android:text='÷' android:textColor='#FF4500' /> <Button android: android:text='7' /> <Button android: android:text='8' /> <Button android: android:text='9' /> <Button android: android:text='×' android:textColor='#FF4500' /> <Button android: android:text='4' /> <Button android: android:text='5' /> <Button android: android:text='6' /> <Button android: android:text='-' android:textColor='#FF4500' /> <Button android: android:text='1' /> <Button android: android:text='2' /> <Button android: android:text='3' /> <Button android: android:layout_width='wrap_content' android:text='+' android:textColor='#FF4500' /> <Button android: android:text='00' /> <Button android: android:text='0' /> <Button android: android:text='.' /> <Button android: android:text='=' android:background='#008B8B' /></GridLayout>

响应及计算(MainActivity)

package com.mylayout;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;public class MainActivity extends AppCompatActivity implements View.OnClickListener { private EditText editText; //数字0-9 private Button b1; private Button b2; private Button b3; private Button b4; private Button b5; private Button b6; private Button b7; private Button b8; private Button b9; private Button b0; private Button b00; //运算符 private Button per; private Button add;// + private Button sub; // - private Button mul; // * private Button div; // / private Button dot; //小数点 private Button equ; // = private boolean back; //退格 private boolean clear_bool= true;//清空 private boolean dot_flag1 = true; private boolean dot_flag2 = true; @Override public void onClick(View view) { String input = editText.getText().toString(); switch (view.getId()){ case R.id.b0: case R.id.b1: case R.id.b2: case R.id.b3: case R.id.b4: case R.id.b5: case R.id.b6: case R.id.b7: case R.id.b8: case R.id.b9: case R.id.b00: if(dot_flag1)dot_flag2 = true; if(clear_bool) { clear_bool = false; editText.setText(''+((Button)view).getText()); } else { editText.setText(input + ((Button)view).getText());//结果集就为本身 } break; case R.id.dot: if(dot_flag1&&dot_flag2) { dot_flag1 = false; dot_flag2 = false; editText.setText(input + ((Button)view).getText()); } break; case R.id.per: case R.id.plus: case R.id.sub: case R.id.mul: case R.id.div: dot_flag1 = true; if(clear_bool) { clear_bool = false; input = ''; editText.setText(''); } editText.setText(input + ((Button)view).getText()+' '); break; case R.id.back: //退格 if(input != null || !input.equals('')) { if(input.length()>1) { editText.setText(input.substring(0, input.length() - 1));// } else{ clear_bool =true; editText.setText('0'); } } break; case R.id.clear: //清空 editText.setText('0'); clear_bool = true; break; case R.id.equ: calculation(); break; } } //计算结果 private void calculation() { String s1 = editText.getText().toString(); //获取字符串 if (s1 == null){ return; } boolean flag = false; if(s1.charAt(0)==’-’) { s1 = s1.substring(1); flag = true; } String []num = s1.split('[-÷×+]'); //分割字符串获得各个数字 double []n = new double[num.length]; for(int i=0;i<num.length;i++) //字符串转数字 { if(num[i].equals(''))continue; //百分号 else if(num[i].contains('%')) n[i] = Double.parseDouble(num[i].replace('%',''))/100; //开根 // else if(num[i].contains('√')) n[i] = Math.sqrt(Double.parseDouble(num[i].replace('√', ''))); else n[i] = Double.parseDouble(num[i]); } if(flag) n[0] -= n[0]*2; //负数情况 char[] sy = s1.replaceAll('[^-÷×+]','').toCharArray(); //获得运算符 int slen = sy.length; if(sy.length == num.length)slen--; char c = ’+’; double result = n[0] ;//结果 if(n.length>1) { for (int j = 0; j < slen; j++) //先算乘除 { if (sy[j] == ’×’) { n[j + 1] = n[j] * n[j + 1]; n[j] = 0; if (c == ’+’) sy[j] = ’+’; //判断乘除的前一个运算符是什么 else sy[j] = ’-’; } else if (sy[j] == ’÷’) { if (n[j + 1] != 0) n[j + 1] = n[j] / n[j + 1]; else n[j + 1] = 0; n[j] = 0; if (c == ’+’) sy[j] = ’+’; else sy[j] = ’-’; } else c = sy[j]; } result = n[0]; for (int j = 0; j < slen; j++) { //求和 if (sy[j] == ’+’) result += n[j + 1]; if (sy[j] == ’-’) result -= n[j + 1]; } } if((int)result == result )editText.setText((int)result+''); //显示 else { //控制输出小数点后6位 result = Double.parseDouble(String.format('%.6f', result)); editText.setText(result+''); } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //获取id View b1 = findViewById(R.id.b1); View b2 = findViewById(R.id.b2); View b3= findViewById(R.id.b3); View b4 = findViewById(R.id.b4); View b5 = findViewById(R.id.b5); View b6 = findViewById(R.id.b6); View b7 = findViewById(R.id.b7); View b8 = findViewById(R.id.b8); View b9 = findViewById(R.id.b9); View b0 = findViewById(R.id.b0); View b00 = findViewById(R.id.b00); //运算符 View plus = findViewById(R.id.plus);// + View sub = findViewById(R.id.sub);// - View mul = findViewById(R.id.mul);// * View per = findViewById(R.id.per); // % View div = findViewById(R.id.div); // / View dot = findViewById(R.id.dot);//小数点 View equ = findViewById(R.id.equ);//= View clear = findViewById(R.id.clear);//清空 View back = findViewById(R.id.back); //回退 editText = (EditText) findViewById(R.id.editText);//结果集 //添加监听事件 b0.setOnClickListener(this); b1.setOnClickListener(this); b2.setOnClickListener(this); b3.setOnClickListener(this); b4.setOnClickListener(this); b5.setOnClickListener(this); b6.setOnClickListener(this); b7.setOnClickListener(this); b8.setOnClickListener(this); b9.setOnClickListener(this); b00.setOnClickListener(this); per.setOnClickListener(this); plus.setOnClickListener(this); sub.setOnClickListener(this); mul.setOnClickListener(this); div.setOnClickListener(this); dot.setOnClickListener(this); equ.setOnClickListener(this); clear.setOnClickListener(this); back.setOnClickListener(this); }}

测试

关于计算器的精彩文章请查看《计算器专题》 ，更多精彩等你来发现！

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