Android——button控件使用

a001.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6
 7     <Button
 8         android:id="@+id/btnShow"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:text="显示吐司" />
12
13 </LinearLayout>

A001.java

 1 package com.example.main;
 2
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.view.View.OnClickListener;
 7 import android.widget.Button;
 8 import android.widget.Toast;
 9
10 public class A001 extends Activity {
11
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.a001);
16
17         // 获取 button 控件
18         Button button = (Button) findViewById(R.id.btnShow);
19
20         //button 点击事件
21         button.setOnClickListener(new OnClickListener() {
22
23             @Override
24             public void onClick(View v) {
25                 //点击 button 显示吐司
26                 Toast.makeText(A001.this, "按钮控件", Toast.LENGTH_SHORT).show();
27             }
28         });
29     }
30 }