Android笔记：Button

示例代码摘自《第一行代码》

ButtonDemo.java的代码：

public class ButtonDemo extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.demo_button);

Button button1 = (Button) findViewById(R.id.button_1);  //加载按钮
button1.setOnClickListener(new OnClickListener() {   //注册监听事件
@Override
public void onClick(View v) {
Toast.makeText(ButtonDemo.this, "You clicked Button 1",
Toast.LENGTH_SHORT).show();          //弹出消息
}
});
}
}

Layout的demo_button.xml:

<Button
android:id="@+id/button_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button 1" />

效果如下所示：