Android studio实现简易计算器App功能
在Android studio实现简易计算器App并实现加减乘除功能,供大家参考,具体内容如下
结果
activity_main.xml
<?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:paddingBottom="10dp" android:paddingLeft="10dp" android:paddingRight="10dp" android:paddingTop="10dp"> <EditText android:id="@+id/et_result" android:hint="请输入数字" android:layout_width="match_parent" android:layout_height="100dp" android:layout_gravity="left" android:gravity="right" android:textSize="50sp" /> <GridLayout android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/sz" android:layout_gravity="center" android:orientation="horizontal" android:columnCount="4" android:rowCount="5"> <Button android:id="@+id/btn_clear" android:layout_columnSpan="3" android:layout_gravity="fill_horizontal" android:text="C DEL" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_div" android:text="÷" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_1" android:text="1" android:layout_rowWeight="1" android:textSize="26sp"/> <Button android:id="@+id/btn_2" android:text="2" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_3" android:text="3" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_add" android:text="+" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_4" android:text="4" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_5" android:text="5" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_6" android:text="6" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_sub" android:text="-" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_7" android:text="7" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_8" android:text="8" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_9" android:text="9" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_mul" android:text="×" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_0" android:text="0" android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_dot" android:text="." android:layout_rowWeight="1" android:textSize="26sp" /> <Button android:id="@+id/btn_equ" android:text="=" android:layout_rowWeight="1" android:layout_columnSpan="2" android:layout_gravity="fill_horizontal" android:textSize="26sp" /> </GridLayout> </LinearLayout>
MainActivity.java
package com.example.a86189.szcounter; 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 { Button btn1; // 数字1 Button btn2; // 数字2 Button btn3; // 数字3 Button btn4; // 数字4 Button btn5; // 数字5 Button btn6; // 数字6 Button btn7; // 数字7 Button btn8; // 数字8 Button btn9; // 数字9 Button btn0; // 数字0 Button add; // +号 Button sub; // -号 Button mul; // *号 Button div; // 除号 Button dot; // 小数点 Button equ; // =号 Button clear; //清除 EditText result; // 显示文本 double num1 = 0, num2 = 0; //计算的数字 double Result = 0;//计算结果 int op = 0;//判断操作符 String opd = " ";//显示操作符 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 获取页面上的控件 btn1 = (Button) findViewById(R.id.btn_1); btn2 = (Button)findViewById(R.id.btn_2); btn3 = (Button)findViewById(R.id.btn_3); btn4 = (Button)findViewById(R.id.btn_4); btn5 = (Button)findViewById(R.id.btn_5); btn6 = (Button)findViewById(R.id.btn_6); btn7 = (Button)findViewById(R.id.btn_7); btn8 = (Button)findViewById(R.id.btn_8); btn9 = (Button)findViewById(R.id.btn_9); btn0 = (Button)findViewById(R.id.btn_0); add = (Button)findViewById(R.id.btn_add); sub = (Button)findViewById(R.id.btn_sub); mul = (Button)findViewById(R.id.btn_mul); div = (Button)findViewById(R.id.btn_div); equ = (Button)findViewById(R.id.btn_equ); dot = (Button)findViewById(R.id.btn_dot); clear =(Button) findViewById(R.id.btn_clear); result =(EditText) findViewById(R.id.et_result); // 按钮的单击事件 btn1.setOnClickListener(new Click()); btn2.setOnClickListener(new Click()); btn3.setOnClickListener(new Click()); btn4.setOnClickListener(new Click()); btn5.setOnClickListener(new Click()); btn6.setOnClickListener(new Click()); btn7.setOnClickListener(new Click()); btn8.setOnClickListener(new Click()); btn9.setOnClickListener(new Click()); btn0.setOnClickListener(new Click()); add.setOnClickListener(new Click()); sub.setOnClickListener(new Click()); mul.setOnClickListener(new Click()); div.setOnClickListener(new Click()); equ.setOnClickListener(new Click()); dot.setOnClickListener(new Click()); clear.setOnClickListener(new Click()); result.setOnClickListener(new Click()); } // 设置按钮点击后的监听 class Click implements View.OnClickListener { public void onClick(View v) { switch (v.getId()) { //switch循环获取点击按钮后的值 case R.id.btn_0: //获取,0-9、小数点,并在编辑框显示 String myString = result.getText().toString(); myString += "0"; result.setText(myString); break; case R.id.btn_1: String myString1 = result.getText().toString(); myString1 += "1"; result.setText(myString1); break; case R.id.btn_2: String myString2 = result.getText().toString(); myString2 += "2"; result.setText(myString2); break; case R.id.btn_3: String myString3 = result.getText().toString(); myString3 += "3"; result.setText(myString3); break; case R.id.btn_4: String myString4 = result.getText().toString(); myString4 += "4"; result.setText(myString4); break; case R.id.btn_5: String myString5 = result.getText().toString(); myString5 += "5"; result.setText(myString5); break; case R.id.btn_6: String myString6 = result.getText().toString(); myString6 += "6"; result.setText(myString6); break; case R.id.btn_7: String myString7 = result.getText().toString(); myString7 += "7"; result.setText(myString7); break; case R.id.btn_8: String myString8 = result.getText().toString(); myString8 += "8"; result.setText(myString8); break; case R.id.btn_9: String myString9 = result.getText().toString(); myString9 += "9"; result.setText(myString9); break; case R.id.btn_dot: String myStringDot = result.getText().toString(); myStringDot += "."; result.setText(myStringDot); break; case R.id.btn_add: //判断,使用加减乘除的操作符 String myStringAdd = result.getText().toString(); if (myStringAdd.equals(null)) { return; } num1 = Double.valueOf(myStringAdd); result.setText(null); op = 1; opd = "+"; break; case R.id.btn_sub: String myStringSub = result.getText().toString(); if (myStringSub.equals(null)) { return; } num1 = Double.valueOf(myStringSub); result.setText(null); op = 2; opd = "-"; break; case R.id.btn_mul: String myStringMul = result.getText().toString(); if (myStringMul.equals(null)) { return; } num1 = Double.valueOf(myStringMul); result.setText(null); op = 3; opd = "×"; break; case R.id.btn_div: String myStringDiv = result.getText().toString(); if (myStringDiv.equals(null)) { return; } num1 = Double.valueOf(myStringDiv); result.setText(null); op = 4; opd = "÷"; break; case R.id.btn_clear: //清除,将编辑框文本显示为空 result.setText(null); break; case R.id.btn_equ: //计算,以操作符为判断,选择所需的运算,并将结果输出 String myStringEqu = result.getText().toString(); if (myStringEqu.equals(null)) { return; } num2 = Double.valueOf(myStringEqu); result.setText(null); switch (op) { case 0: Result = num2; break; case 1: Result = num1 + num2; break; case 2: Result = num1 - num2; break; case 3: Result = num1 * num2; break; case 4: if (num2 == 0) //除法中分子与分母之分 Result = 0; else Result = num1 / num2; break; default: Result = 0; break; } result.setText(Double.toString(num1) + opd + Double.toString(num2) + "=" + Double.toString(Result)); //将结果完整输出 break; default: break; } } } }
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