5.用户接口UI布局----View控件的概述之Button

Button(textview子类)----控件能向用户展现文本信息
//Withtext
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_text"
.../>
//Withanicon(ImageView子类)

<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/button_icon"
.../>
//Withtextandanicon

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_text"
android:drawableLeft="@drawable/button_icon"
.../>

android:onClick="sendMessage"

publicvoidsendMessage(Viewview){
//Dosomethinginresponsetobuttonclick
}

sendMessage应该满足

View

View