第四次作业

package com.example.jsj;

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

public class MainActivity extends Activity {
     EditText shuone;
     EditText shutwe;
     RadioGroup rag;
     Button but_five;
     TextView jg;
      int Result=0;
      int shuone1=0;
      int shutwe1=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        shuone = (EditText) findViewById(R.id.one);
        shutwe = (EditText) findViewById(R.id.twe);
        rag = (RadioGroup) findViewById(R.id.rag);
        jg = (TextView) findViewById(R.id.text_one);
        but_five = (Button) findViewById(R.id.but_five);
        rag.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                 shuone1= Integer.parseInt(shuone.getText().toString().trim());
                 shutwe1= Integer.parseInt(shutwe.getText().toString().trim());
                // TODO Auto-generated method stub
                 String a ="";
                 switch (checkedId) {
                case R.id.but_one:
                     a= shuone1+shutwe1+"";
                    break;
                case R.id.but_twe:
                          a = shuone1-shutwe1+"";
                    break;
                case R.id.but_three:
                          a= shuone1*shutwe1+"";
                    break;
                case R.id.but_four:
                         a= shuone1/shutwe1+"";
                      break;
                }
                
                jg.setText(a);
                }
        });
        but_five.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View view) {
                // TODO Auto-generated method stub
                jg.setText(null);
                shuone.setText(null);
                shutwe.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);
    }
}

<LinearLayout 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:orientation="vertical"
    android:background="#e7e7e7"
    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.jsj.MainActivity" >

    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal">
            <TextView
                android:layout_width="0dp"
                android:layout_height="30dp"
                android:layout_weight="1"
                android:text="输入第一个数"
                android:layout_marginTop="20dp"/>
            <EditText
                android:id="@+id/one"
                android:layout_width="0dp"
                android:layout_height="30dp"
                android:background="#ffffff"
                android:layout_weight="2"
                android:layout_marginTop="20dp">
            </EditText>
        </LinearLayout>

        <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="horizontal"
        >
            <TextView
                android:layout_width="0dp"
                android:layout_height="30dp"
                android:layout_weight="1"
                android:text="输入第二个数"
                android:layout_marginTop="20dp"/>
            <EditText
                android:id="@+id/twe"
                android:layout_width="0dp"
                android:layout_height="30dp"
                android:background="#ffffff"
                android:layout_weight="2"
                android:layout_marginTop="20dp">
            </EditText>
          </LinearLayout>
    </LinearLayout>
       <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        >
                <LinearLayout 
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:orientation="horizontal"
                >
             <RadioGroup
                android:id="@+id/rag"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal"
                >
            <RadioButton 
                android:id="@+id/but_one"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:textSize="25dp"
                android:layout_weight="1"
                android:text="+"
                />
            <RadioButton 
                android:id="@+id/but_twe"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:textSize="25dp"
                android:layout_weight="1"
                android:text="—"
                />
             <RadioButton 
                android:id="@+id/but_three"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:textSize="25dp"
                android:layout_weight="1"
                android:text="*"
                />
             <RadioButton 
                android:id="@+id/but_four"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:textSize="25dp"
                android:layout_weight="1"
                android:text="/"
                />
              </RadioGroup> 
               </LinearLayout>
                <RelativeLayout 
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                >
               <TextView 
                   android:id="@+id/text_one"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:textSize="25dp"
                   android:text="计算机结果显示在这"
                   android:layout_centerInParent="true"
                   />
               </RelativeLayout>
               </LinearLayout>
               <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                   > 
                   <Button 
                       android:id="@+id/but_five"
                       android:layout_width="wrap_content"
                       android:layout_height="wrap_content"
                       android:layout_centerInParent="true"
                       android:text="清空"/>
                   </RelativeLayout>
               

</LinearLayout>