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);   }         });    }}

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