Android控件之Button

Android控件之Button

Button类的结构如下

下面定义两个Button,并给Button添加事件,点击第一个Button显示提示信息,

点击第二个Button输出字符串,在LogCat中查看

布局采用表格布局

 <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/app_name"        />"    <Button        android:id="@+id/btn1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button1"        />        <Button         android:id="@+id/btn2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button2"        />

程序代码如下,点击不同的Button显示不同的效果

package com.example.helloworld;import android.os.Bundle;import android.app.Activity;import android.text.Html;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private Button btn1 = null;private Button btn2 = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn1 = (Button) findViewById(R.id.btn1);btn2 = (Button) findViewById(R.id.btn2);btn1.setOnClickListener(listener);btn2.setOnClickListener(listener);}private OnClickListener listener = new OnClickListener() {public void onClick(View v) {Button btn = (Button) v;switch (btn.getId()) {case R.id.btn1:Toast.makeText(MainActivity.this, "你点击了Button1",Toast.LENGTH_LONG).show();break;case R.id.btn2:System.out.println("你点击了Button2");break;}}};@Overridepublic 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;}}

运行图示如下

点击Button1,模拟器显示提示信息

点击Button2,输出可在LogCat中查看