1、国开Android智能手机编程单元3形考任务1效果图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;

2、/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Overrideprotected 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

3、.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

4、);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.setO

5、nClickListener(this);btnC.setOnClickListener(this);btnAdd.setOnClickListener(this);btnSub.setOnClickListener(this);btnMul.setOnClickListener(this);btnDiv.setOnClickListener(this);btnEqu.setOnClickListener(this);Overridepublic 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 +=

6、 "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 += &qu

7、ot;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

8、"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().

9、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.val

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