基于Android的计算器（代码行数足够用来交大作业）
这是计算器界面的截图，做的和iPhone上的计算器一样
这下面就全是代码了~ ，工程链接如下
链接：https://pan.baidu.com/s/1epUdoX5yLXOSTXBKJb6_OA
提取码：zl4q
MainActivity.java
package com.app.MyComputer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.app.Activity;
public class MainActivity extends Activity implements OnClickListener {
//声明控件
Button btn0;//0键
Button btn1;//1键
Button btn2;//2键
Button btn3;//3键
Button btn4;//4键
Button btn5;//5键
Button btn6;//6键
Button btn7;//7键
Button btn8;//8键
Button btn9;//9键
Button btnC;//清除键
Button btnAdd;//+键
Button btnSub;//-键
Button btnMul;//*键
Button btnDiv;//除键
Button btnEqu;//等于键
Button btnDot;//点键
EditText tvResult;
//声明两个参数。接收tvResult前后的值
double num1 = 0, num2 = 0;
double Result = 0;//计算结果
int op = 0;//判断操作数，
String opd = " ";//显示操作符
boolean isClickEqu = false;//判断是否按了“=”按钮
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//从布局文件中获取控件，
btn0 = (Button) findViewById(R.id.btn0);
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
btn3 = (Button) findViewById(R.id.btn3);
btn4 = (Button) findViewById(R.id.btn4);
btn5 = (Button) findViewById(R.id.btn5);
btn6 = (Button) findViewById(R.id.btn6);
btn7 = (Button) findViewById(R.id.btn7);
btn8 = (Button) findViewById(R.id.btn8);
btn9 = (Button) findViewById(R.id.btn9);
btnC = (Button) findViewById(R.id.btnC);
btnEqu = (Button) findViewById(R.id.btnEqu);
btnAdd = (Button) findViewById(R.id.btnAdd);
btnSub = (Button) findViewById(R.id.btnSub);
btnMul = (Button) findViewById(R.id.btnMul);
btnDiv = (Button) findViewById(R.id.btnDiv);
btnDot = (Button) findViewById(R.id.btnDot);
tvResult = (EditText) findViewById(R.id.tvResult);
//添加监听
btn0.setOnClickListener(this);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
btn5.setOnClickListener(this);
btn6.setOnClickListener(this);
btn7.setOnClickListener(this);
btn8.setOnClickListener(this);
btn9.setOnClickListener(this);
btnDot.setOnClickListener(this);
btnC.setOnClickListener(this);
btnAdd.setOnClickListener(this);
btnSub.setOnClickListener(this);
btnMul.setOnClickListener(this);
btnDiv.setOnClickListener(this);
btnEqu.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) { //switch循环获取点击按钮后的值
case R.id.btn0: //获取，0-9、小数点，并在编辑框显示
String myString = tvResult.getText().toString();
myString += "0";
tvResult.setText(myString);
break;
case R.id.btn1:
String myString1 = tvResult.getText().toString();
myString1 += "1";
tvResult.setText(myString1);
break;
case R.id.btn2:
String myString2 = tvResult.getText().toString();
myString2 += "2";
tvResult.setText(myString2);
break;
case R.id.btn3:
String myString3 = tvResult.getText().toString();
myString3 += "3";
tvResult.setText(myString3);
break;
case R.id.btn4:
String myString4 = tvResult.getText().toString();
myString4 += "4";
tvResult.setText(myString4);
break;
case R.id.btn5:
String myString5 = tvResult.getText().toString();
myString5 += "5";
tvResult.setText(myString5);
break;
case R.id.btn6:
String myString6 = tvResult.getText().toString();
myString6 += "6";
tvResult.setText(myString6);
break;
case R.id.btn7:
String myString7 = tvResult.getText().toString();
myString7 += "7";
tvResult.setText(myString7);
break;
case R.id.btn8:
String myString8 = tvResult.getText().toString();
myString8 += "8";
tvResult.setText(myString8);
break;
case R.id.btn9:
String myString9 = tvResult.getText().toString();
myString9 += "9";
tvResult.setText(myString9);
break;
case R.id.btnAdd: //判断，使用加减乘除的操作符
String myStringAdd = tvResult.getText().toString();
if (myStringAdd.equals(null)) {
return;
}
num1 = Double.valueOf(myStringAdd);
tvResult.setText(null);
op = 1;
opd = "+";
break;
case R.id.btnSub:
String myStringSub = tvResult.getText().toString();
if (myStringSub.equals(null)) {
return;
}
num1 = Double.valueOf(myStringSub);
tvResult.setText(null);
op = 2;
opd = "-";
break;
case R.id.btnMul:
String myStringMul = tvResult.getText().toString();
if (myStringMul.equals(null)) {
return;
}
num1 = Double.valueOf(myStringMul);
tvResult.setText(null);
op = 3;
opd = "×";
break;
case R.id.btnDiv:
String myStringDiv = tvResult.getText().toString();
if (myStringDiv.equals(null)) {
return;
}
num1 = Double.valueOf(myStringDiv);
tvResult.setText(null);
op = 4;
opd = "÷";
break;
case R.id.btnC: //清除，将编辑框文本显示为空
tvResult.setText("");
Result = 0;
break;
case R.id.btnDot: //加入小数点·
String myStringDot = tvResult.getText().toString();
myStringDot += ".";
tvResult.setText(myStringDot);
break;
case R.id.btnEqu: //计算，以操作符为判断，选择所需的运算，并将结果输出
String myStringEqu = tvResult.getText().toString();
if (myStringEqu.equals(null)) {
return;
}
num2 = Double.valueOf(myStringEqu);
tvResult.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;
}
tvResult.setText(Double.toString(Result));
//tvResult.setText(Double.toString(num1) + opd + Double.toString(num2) + "=" + Double.toString(Result)); //将结果完整输出
op = 0;
break;
default:
break;
}
}
}activity_main.xml