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.lll.MainActivity" 
       android:orientation="vertical">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="25dp"
        android:text="请输入第二个数" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="170dp"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView1"
        android:layout_alignBottom="@+id/textView1"
        android:layout_alignParentRight="true"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="56dp"
        android:text="请输入第一个数" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="170dp"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_alignTop="@+id/textView2"
        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/radioButton2"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_above="@+id/rg"
           android:layout_toLeftOf="@+id/editText2"
           android:text="+" />

       <RadioButton
           android:id="@+id/radioButton1"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_alignBottom="@+id/rg"
           android:layout_alignLeft="@+id/textView2"
           android:text="-" />

       <RadioButton
           android:id="@+id/radioButton3"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_alignBottom="@+id/rg"
           android:layout_toRightOf="@+id/rg"
           android:text="*" />

       <RadioButton
           android:id="@+id/radioButton4"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_above="@+id/rg"
           android:layout_alignRight="@+id/editText2"
           android:text="/" />
</RadioGroup>
       <TextView
           android:id="@+id/textView3"
           android:layout_width="60dp"
           android:layout_height="35dp"
           android:layout_below="@+id/rg"
           android:layout_centerHorizontal="true"
           android:layout_marginTop="51dp"
           android:background="#ccccff"
           android:text="" />

       <Button
           android:id="@+id/button1"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_alignParentBottom="true"
           android:layout_centerHorizontal="true"
           android:layout_marginBottom="21dp"
           android:onClick="CCC"
           android:text="清除" />

</RelativeLayout>

package com.example.lll;

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);
        RadioGroup rg = (RadioGroup) findViewById(R.id.rg);
        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // TODO Auto-generated method stub
                 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);
    }
}