作业四

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/EditText2"
        android:layout_width="113dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/EditText1"
        android:layout_alignParentRight="true"
        android:layout_marginTop="17dp"
        android:layout_marginRight="109dp"
        android:ems="10" />

    <TextView
        android:id="@+id/TextView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/EditText2"
        android:layout_marginRight="18dp"
        android:layout_marginBottom="7dp"
        android:layout_toLeftOf="@+id/EditText2"
        android:text="第二个数" />

    <EditText
        android:id="@+id/EditText1"
        android:layout_width="112dp"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/EditText2"
        android:layout_marginLeft="-3dp"
        android:layout_marginTop="200dp"
        android:ems="10" />

    <TextView
        android:id="@+id/TextView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/EditText1"
        android:layout_marginRight="17dp"
        android:layout_marginBottom="6dp"
        android:layout_toLeftOf="@+id/EditText1"
        android:text="第一个数" />

    <TextView
        android:id="@+id/jieguo"
        android:layout_width="138dp"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/TextView3"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_marginTop="2dp"
        android:layout_marginEnd="90dp"
        android:layout_marginRight="90dp" />

    <Button
        android:id="@+id/EMPTY"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginStart="1dp"
        android:layout_marginBottom="58dp"
        android:layout_toEndOf="@+id/rdg"
        android:onClick="click"
        android:text="EMPTY" />

    <TextView
        android:id="@+id/TextView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/EMPTY"
        android:layout_alignLeft="@+id/TextView2"
        android:layout_marginLeft="2dp"
        android:layout_marginBottom="100dp"
        android:text="结果" />

    <RadioGroup
        android:id="@+id/rdg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/TextView3"
        android:layout_alignLeft="@+id/TextView3"
        android:orientation="vertical"
        tools:ignore="UnknownId">

        <RadioButton
            android:id="@+id/add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@+id/rdg"
            android:text="+" />

        <RadioButton
            android:id="@+id/minus"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@+id/add"
            android:text="-" />

        <RadioButton
            android:id="@+id/mul"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@+id/minus"
            android:text="*" />

        <RadioButton
            android:id="@+id/devide"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@+id/mul"
            android:text="/" />

    </RadioGroup>

</RelativeLayout>

package com.example.zuoyesi;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends Activity implements OnCheckedChangeListener {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RadioGroup rg = (RadioGroup) findViewById(R.id.rdg);
        rg.setOnCheckedChangeListener(this);

    }


    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        EditText et1 = (EditText) findViewById(R.id.EditText1);
        EditText et2 = (EditText) findViewById(R.id.EditText2);
        String s1 = et1.getText().toString();
        String s2 = et2.getText().toString();
        double num1 = Integer.valueOf(s1).intValue();
        double num2 = Integer.valueOf(s2).intValue();
// TODO 自动生成的方法存根
        TextView tv = (TextView) findViewById(R.id.jieguo);
        switch (checkedId) {
            case R.id.add:
                num1 = num1 + num2;
                s1 = String.valueOf(num1);
                tv.setText(s1);
                break;
            case R.id.minus:
                num1 = num1 - num2;
                s1 = String.valueOf(num1);
                tv.setText(s1);
                break;
            case R.id.mul:
                num1 = num1 * num2;
                s1 = String.valueOf(num1);
                tv.setText(s1);
                break;
            case R.id.devide:
                num1 = num1 / num2;
                s1 = String.valueOf(num1);
                tv.setText(s1);
                break;

        }

    }

    public void click(View view) {
        TextView tv = (TextView) findViewById(R.id.jieguo);
        TextView tv2 = (TextView) findViewById(R.id.EditText1);
        ;
        TextView tv3 = (TextView) findViewById(R.id.EditText2);
        ;
        switch (view.getId()) {

            case R.id.EMPTY:
                tv.setText("");
                tv2.setText("");
                tv3.setText("");
        }
    }
}