1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7 <TextView
 8     android:layout_width="fill_parent"
 9     android:layout_height="wrap_content"
10     android:text="请输入第一个数："
11     />
12 <EditText
13     android:id="@+id/num1"
14     android:textColorHint="#ff2323"
15     android:layout_width="fill_parent"
16     android:layout_height="wrap_content"
17     android:hint="num"
18     />
19 <TextView
20     android:layout_width="fill_parent"
21     android:layout_height="wrap_content"
22     android:text="请输入第二个数："
23     />
24 <EditText
25     android:id="@+id/num2"
26     android:layout_width="fill_parent"
27     android:layout_height="wrap_content"
28     android:hint="num"
29     />
30     <TextView
31         android:layout_width="fill_parent"
32         android:layout_height="wrap_content"
33         android:text="结果："
34         />
35     <EditText
36         android:id="@+id/num3"
37         android:layout_width="fill_parent"
38         android:layout_height="wrap_content"
39         android:editable="false"
40         android:hint="结果"
41         />
42
43 <Button android:id="@+id/button1"
44     android:onClick="button_click"
45     android:layout_width="fill_parent"
46     android:layout_height="wrap_content"
47     android:text="@string/hello_world"
48     />
49
50 </LinearLayout>

 1 package com.example.hehe;
 2
 3 import android.os.Bundle;
 4 import android.app.Activity;
 5 import android.view.Menu;
 6
 7 import android.view.View;
 8
 9 import android.widget.Button;
10 import android.widget.EditText;
11
12 import android.widget.Toast;
13 import android.app.Activity;
14 import android.graphics.Color;
15 import android.os.Bundle;
16 import android.provider.CalendarContract.Colors;
17 import android.view.KeyEvent;
18 import android.view.View;
19 import android.view.View.OnKeyListener;
20 import android.widget.EditText;
21 import android.widget.TextView;
22
23 public class MainActivity extends Activity {
24     @Override
25     protected void onCreate(Bundle savedInstanceState) {
26         super.onCreate(savedInstanceState);
27         setContentView(R.layout.activity_main);
28     }
29
30
31     @Override
32     public boolean onCreateOptionsMenu(Menu menu) {
33         // Inflate the menu; this adds items to the action bar if it is present.
34         getMenuInflater().inflate(R.menu.main, menu);
35         return true;
36     }
37     public void button_click(View v)
38     {
39     //    Button button1 = (Button) findViewById(R.id.button1);
40         Button button1 = (Button)v;
41
42         EditText num1 = (EditText) findViewById(R.id.num1);
43         EditText num2 = (EditText) findViewById(R.id.num2);
44         EditText num3 = (EditText) findViewById(R.id.num3);
45         int a = Integer.parseInt(num1.getText().toString());
46         int b = Integer.parseInt(num2.getText().toString());
47         int c = a + b;
48         String te = ""+a+"+"+b+"="+c;
49         num3.setText(te);
50         num3.setTextColor(Color.GREEN);
51     }
52 }