<code class="lang-java">package org.kechuang.bbs.acmilan.mycalculator;
      
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
      
public class MainBoard extends AppCompatActivity {
      
    private EditText edita;
    private EditText editb;
    private EditText editresult;
    private View.OnClickListener onclickbutton = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                double a = Double.parseDouble(edita.getText().toString());
                double b = Double.parseDouble(editb.getText().toString());
                double result = 0;
                switch (v.getId()) {
                    case R.id.btnadd:
                        result = a + b;
                        break;
                    case R.id.btnsub:
                        result = a - b;
                        break;
                    case R.id.btnmul:
                        result = a * b;
                        break;
                    case R.id.btndiv:
                        result = a / b;
                        break;
                    default:
                        throw new Exception("Invalid Button");
                }
                editresult.setText(Double.toString(result));
            }catch (Exception e) {
                Toast.makeText(MainBoard.this, "出现了错误", Toast.LENGTH_LONG).show();
            }
        }
    };
      
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      
        Button btnadd = (Button)findViewById(R.id.btnadd);
        Button btnsub = (Button)findViewById(R.id.btnsub);
        Button btnmul = (Button)findViewById(R.id.btnmul);
        Button btndiv = (Button)findViewById(R.id.btndiv);
        btnadd.setOnClickListener(onclickbutton);
        btnsub.setOnClickListener(onclickbutton);
        btnmul.setOnClickListener(onclickbutton);
        btndiv.setOnClickListener(onclickbutton);
      
        edita = (EditText)findViewById(R.id.edita);
        editb = (EditText)findViewById(R.id.editb);
        editresult = (EditText)findViewById(R.id.editresult);
      
    }
}</code>

<code class="lang-xml"><?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"     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="org.kechuang.bbs.acmilan.mycalculator.MainBoard">
  
    <linearlayout         android:orientation="vertical"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_alignparenttop="true"         android:layout_alignparentleft="true"         android:layout_alignparentstart="true"         android:weightsum="1">
  
        <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:textappearance="?android:attr/textAppearanceLarge"             android:text="A ="             android:id="@+id/textView">
  
        <edittext             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:inputtype="numberDecimal"             android:ems="10"             android:id="@+id/edita">
  
        <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:textappearance="?android:attr/textAppearanceLarge"             android:text="B ="             android:id="@+id/textView2">
  
        <edittext             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:inputtype="numberDecimal"             android:ems="10"             android:id="@+id/editb">
  
        <linearlayout             android:orientation="horizontal"             android:layout_width="match_parent"             android:layout_height="wrap_content">
  
            <button                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="加法"                 android:id="@+id/btnadd">
  
            </button><button                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="减法"                 android:id="@+id/btnsub">
  
        </button></linearlayout>
  
        <linearlayout             android:orientation="horizontal"             android:layout_width="match_parent"             android:layout_height="wrap_content">
  
            <button                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="乘法"                 android:id="@+id/btnmul">
  
            </button><button                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="除法"                 android:id="@+id/btndiv">
        </button></linearlayout>
  
        <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:textappearance="?android:attr/textAppearanceLarge"             android:text="结果："             android:id="@+id/textView3">
  
        <edittext             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:inputtype="numberDecimal"             android:ems="10"             android:id="@+id/editresult">
    </edittext></textview></edittext></textview></edittext></textview></linearlayout>
</relativelayout></code>

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