作业4

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.js.MainActivity" 
       android:orientation="vertical">


    <TextView
        android:id="@+id/textView2"
        android:layout_width="80dp"
        android:layout_height="20dp"
        android:layout_alignRight="@+id/textView1"
        android:layout_below="@+id/textView1"
       
        android:layout_marginTop="50dp"
        android:text="输入第二个" />

    <TextView
        android:id="@+id/textView1"
            android:layout_width="80dp"
        android:layout_height="20dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
  
         android:layout_marginTop="50dp"
        android:text="输入第一个" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView1"
        android:layout_alignBottom="@+id/textView1"
        android:layout_alignParentRight="true"
        android:ems="10" />
<RadioGroup
           android:id="@+id/rg"
           android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:orientation="horizontal" >
    <RadioButton
        android:id="@+id/radioButton1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView2"
        android:layout_below="@+id/editText2"
        android:layout_marginTop="100dp"
        android:text="-" />

    <RadioButton
        android:id="@+id/radioButton2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/radioButton1"
        android:layout_marginTop="100dp"
        android:text="+" />

    <RadioButton
        android:id="@+id/radioButton3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/radioButton1"
        android:layout_below="@+id/radioButton1"
        android:layout_marginTop="100dp"
        android:text="*" />

    <RadioButton
        android:id="@+id/radioButton4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/radioButton3"
        android:layout_marginTop="100dp"
        android:text="/" />
</RadioGroup>
    <TextView
        android:id="@+id/textView3"
        android:layout_width="80dp"
        android:layout_height="20dp"
        android:layout_centerVertical="true"
        android:layout_marginLeft="120dp"
         android:text="输出结果"

         />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_alignTop="@+id/textView2"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView3"
        android:layout_below="@+id/rg"
        android:layout_marginTop="40dp"
        android:onClick="CCC"
        android:text="计算" />

</RelativeLayout>


package com.example.js;

import java.util.Set;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		setContentView(R.layout.activity_main);
		RadioGroup rg = (RadioGroup) findViewById(R.id.rg);
        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
			
			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {
				 try {
			            EditText EditText1 = (EditText) findViewById(R.id.editText1);
			            EditText EditText2 = (EditText) findViewById(R.id.editText2);
			            TextView textView3 = (TextView) findViewById(R.id.textView3);
			            String s1 = EditText1.getText().toString();
			            String s2 = EditText2.getText().toString();
			            double a = Double.parseDouble(s1);
			            double b =Double.parseDouble(s2) ;
			            switch (checkedId) {
			            case R.id.radioButton1:
			                int m1 = (int) (a - b);
			                textView3.setText(""+m1);
			                break;
			            case R.id.radioButton2:
			                int m2 = (int) (a + b);
			                textView3.setText(""+m2);
			                break;
			            case R.id.radioButton3:
			                int m3 = (int) (a * b);
			                textView3.setText(""+m3);
			                break;
			            case R.id.radioButton4:
			                int m4 = (int) (a / b);
			                textView3.setText(""+m4);
			                break;
			            default:
			                break;
			            }
				 } catch (Exception e) {
			            Toast.makeText(MainActivity.this, "请输入数据", 0).show();
			        }
			}
		});
    }
    public void CCC(View v) {
            TextView textView3 = (TextView) findViewById(R.id.textView3);
            EditText editText = (EditText) findViewById(R.id.editText1);
            EditText editText2 = (EditText) findViewById(R.id.editText2);
            switch (v.getId()) {
            case R.id.button1:
            	textView3.setText("");
               
				editText.setText(null);
                
				editText2.setText(null);      
            }
    }
 
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}