android计算器简单版【安卓进化一】

一、布局文件main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <EditText android:id="@+id/number1" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <RadioGroup android:id="@+id/RadioGroup_choice" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_x="3px" android:layout_y="54px" > <RadioButton android:id="@+id/add_RadioButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10px" android:text="+" /> <RadioButton android:id="@+id/jian_RadioButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10px" android:text="-" /> <RadioButton android:id="@+id/cheng_RadioButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10px" android:text="*" /> <RadioButton android:id="@+id/chu_RadioButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10px" android:text="/" /> </RadioGroup> <EditText android:id="@+id/number2" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Button android:id="@+id/resultButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="结果" /> <TextView android:id="@+id/resultTextView" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout>

二、android代码功能实现

package com.cn.android; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.RadioGroup.OnCheckedChangeListener; import android.widget.TextView; public class MainActivity extends Activity { /** Called when the activity is first created. */ private EditText number1 = null; private EditText number2 = null; private Button resultButton = null; private TextView resultTextView = null; private RadioGroup mRadioGroup = null; private RadioButton jiaRadioButton,jianRadioButton,chengRadioButton,chuRadioButton; private String yunsuan; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); number1 = (EditText)findViewById(R.id.number1); number2 = (EditText)findViewById(R.id.number2); resultButton = (Button)findViewById(R.id.resultButton); mRadioGroup = (RadioGroup)findViewById(R.id.RadioGroup_choice); jiaRadioButton = (RadioButton)findViewById(R.id.add_RadioButton); jianRadioButton = (RadioButton)findViewById(R.id.jian_RadioButton); chengRadioButton = (RadioButton)findViewById(R.id.cheng_RadioButton); chuRadioButton = (RadioButton)findViewById(R.id.chu_RadioButton); resultTextView = (TextView)findViewById(R.id.resultTextView); mRadioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener(){ public void onCheckedChanged(RadioGroup arg0, int arg1) { // TODO Auto-generated method stub if(arg1 == jiaRadioButton.getId()){ yunsuan = "+"; } else if(arg1 == jianRadioButton.getId()){ yunsuan = "-"; } else if(arg1 == chengRadioButton.getId()){ yunsuan = "*"; } else if(arg1 == chuRadioButton.getId()){ yunsuan = "/"; } } }); resultButton.setOnClickListener(new OnClickListener(){ public void onClick(View arg0) { // TODO Auto-generated method stub String num1 = number1.getText().toString(); String num2 = number2.getText().toString(); final double dnum1 = Double.parseDouble(num1); final double dnum2 = Double.parseDouble(num2); double resultNum = 0.0; if(yunsuan.equals("+")){ resultNum = dnum1 + dnum2; } else if(yunsuan.equals("-")){ resultNum = dnum1 - dnum2; } else if(yunsuan.equals("*")){ resultNum = dnum1 * dnum2; } else if(yunsuan.equals("/")){ resultNum = dnum1 / dnum2; } String resultString = String.valueOf(resultNum); resultTextView.setText(resultString); } }); } }