Android实现简易的计算器
Red&&Black 人气:0布局(activity_main.xml)
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/GridLayout1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:columnCount="4" android:orientation="horizontal" android:rowCount="6" > <EditText android:id="@+id/editText" android:layout_columnSpan="4" android:layout_gravity="fill" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" android:text="0" android:textSize="50sp" /> <Button android:id="@+id/clear" android:layout_columnSpan="1" android:layout_gravity="fill" android:text="清空" android:textColor="#FF4500" /> <Button android:id="@+id/back" android:layout_columnSpan="1" android:layout_gravity="fill" android:text="回退" android:textColor="#FF4500" /> <Button android:id="@+id/per" android:text="%" android:textColor="#FF4500" /> <Button android:id="@+id/div" android:text="÷" android:textColor="#FF4500" /> <Button android:id="@+id/b7" android:text="7" /> <Button android:id="@+id/b8" android:text="8" /> <Button android:id="@+id/b9" android:text="9" /> <Button android:id="@+id/mul" android:text="×" android:textColor="#FF4500" /> <Button android:id="@+id/b4" android:text="4" /> <Button android:id="@+id/b5" android:text="5" /> <Button android:id="@+id/b6" android:text="6" /> <Button android:id="@+id/sub" android:text="-" android:textColor="#FF4500" /> <Button android:id="@+id/b1" android:text="1" /> <Button android:id="@+id/b2" android:text="2" /> <Button android:id="@+id/b3" android:text="3" /> <Button android:id="@+id/plus" android:layout_width="wrap_content" android:text="+" android:textColor="#FF4500" /> <Button android:id="@+id/b00" android:text="00" /> <Button android:id="@+id/b0" android:text="0" /> <Button android:id="@+id/dot" android:text="." /> <Button android:id="@+id/equ" 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!
加载全部内容