Android添加button并响应

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.fate.testproject.MainActivity" >
11 
12     <TextView
13         android:layout_width="match_parent"
14         android:layout_height="wrap_content"
15         android:text="@string/total" 
16         android:textSize="45sp"
17         android:layout_gravity="center" 
18         android:gravity="center"
19         android:id="@+id/tvTotal"
20         />
21     
22     <Button
23         android:layout_width="250sp"
24         android:layout_height="wrap_content"
25         android:text="@string/addOne"
26         android:layout_gravity="center"
27         android:textSize="20sp"
28         android:id="@+id/bAddOne"
29         />
30     <Button 
31         android:layout_width="250sp"
32         android:layout_height="wrap_content"
33         android:text="@string/subOne"
34         android:layout_gravity="center"
35         android:textSize="20sp"
36         android:id="@+id/bSubOne"
37         />
38 
39 
40 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <resources>
 3 
 4     <string name="app_name">TestProject</string>
 5     <string name="hello_world">Hello world!</string>
 6     <string name="action_settings">Settings</string>
 7     <string name="total">总数为：0</string>
 8     <string name="subOne">数值减一</string>
 9     <string name="addOne">数值加一</string>
10 
11 </resources>

 1 package com.fate.testproject;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.Menu;
 6 import android.view.MenuItem;
 7 import android.view.View;
 8 import android.widget.Button;
 9 import android.widget.TextView;
10 
11 
12 public class MainActivity extends Activity {
13 
14     int counter;//创建int变量counter
15     Button mAddOne, mSubOne;//创建两个button变量，分别是加一button和减一button
16     TextView mTotal;//创建TextView类型的变量mTotal
17     
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22         
23         
24         //初始化变量的值
25         counter = 0;
26         
27         //关联两个button和TextView变量
28         mAddOne = (Button)findViewById(R.id.bAddOne);
29         mSubOne = (Button)findViewById(R.id.bSubOne);
30         mTotal = (TextView)findViewById(R.id.tvTotal);
31         
32         //添加按钮单机响应函数
33         mAddOne.setOnClickListener(new View.OnClickListener() {
34             
35             @Override
36             public void onClick(View v) {
37                 // TODO Auto-generated method stub
38                 counter++;
39                 mTotal.setText("总数为：" + counter);
40             }
41         });
42         
43         mSubOne.setOnClickListener(new View.OnClickListener() {
44             
45             @Override
46             public void onClick(View v) {
47                 // TODO Auto-generated method stub
48                 counter--;
49                 mTotal.setText("总数为：" + counter);
50             }
51         });
52     }
53 
54 
55     @Override
56     public boolean onCreateOptionsMenu(Menu menu) {
57         // Inflate the menu; this adds items to the action bar if it is present.
58         getMenuInflater().inflate(R.menu.main, menu);
59         return true;
60     }
61 
62     @Override
63     public boolean onOptionsItemSelected(MenuItem item) {
64         // Handle action bar item clicks here. The action bar will
65         // automatically handle clicks on the Home/Up button, so long
66         // as you specify a parent activity in AndroidManifest.xml.
67         int id = item.getItemId();
68         if (id == R.id.action_settings) {
69             return true;
70         }
71         return super.onOptionsItemSelected(item);
72     }
73 }