android中ImageView、ImageButton、Button之间的区别

1.继承不同：

java.lang.Object ↳ android.view.View ↳android.widget.ImageView ↳ android.widget.ImageButton 

java.lang.Object ↳ android.view.View ↳ android.widget.TextView ↳android.widget.Button

因而ImageButton 不支持setText，而Button支持。反之，ImageButton 支持setImageURI，而Button不支持。Button和ImageButton有Button的状态，但是ImageView没有。

2.显示差异：

imageView 加上可点击的属性同样实现button的点击功能，这样看来没啥区别，可是可是，最近我做的listView，一个imagebutton，一个imageView 显示圆角图片的时候，imageBotton 居然显示不出来.

ImageButton 拥有默认背景：

<div class="dp-highlighter bg_html" style="font-family: Consolas, 'Courier New', Courier, mono, serif; font-size: 12px; width: 887.03125px; overflow: auto; padding-top: 1px; margin: 18px 0px !important; background-color: rgb(231, 229, 220);"><div class="bar" style="padding-left: 45px;"><div class="tools" style="padding: 3px 8px 10px 10px; font-size: 9px; line-height: normal; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; color: silver; border-left-width: 3px; border-left-style: solid; border-left-color: rgb(153, 153, 153); background-color: rgb(248, 248, 248);"><strong>[html]</strong> <a target=_blank href="http://blog.csdn.net/zapzqc/article/details/8497210#" class="ViewSource" title="view plain" style="color: rgb(160, 160, 160); text-decoration: none; border: none; padding: 0px; margin: 0px 10px 0px 0px; font-size: 9px; background-image: none; background-attachment: initial; background-color: inherit; background-size: initial; background-origin: initial; background-clip: initial; 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text-decoration: none; border: none; padding: 0px; margin: 0px 10px 0px 0px; font-size: 9px; background-image: none; background-attachment: initial; background-color: inherit; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;">?</a><div style="position: absolute; left: 512px; top: 654px; width: 29px; height: 14px; z-index: 99;"></div></div></div><ol start="1" class="dp-xml" style="padding: 0px; border: none; list-style-position: initial; list-style-image: initial; color: rgb(92, 92, 92); margin: 0px 0px 1px 45px !important; background-color: rgb(255, 255, 255);"><li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(153, 153, 153); list-style: decimal-leading-zero outside; color: inherit; margin: 0px !important; padding: 0px 3px 0px 10px !important; background-color: rgb(245, 250, 226);"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">style</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">name</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"Widget.ImageButton"</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(153, 153, 153); list-style: decimal-leading-zero outside; color: rgb(85, 85, 85); margin: 0px !important; padding: 0px 3px 0px 10px !important; background-color: rgb(245, 250, 226);"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">     <span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">item</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">name</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"android:focusable"</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">true</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"></</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">item</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(153, 153, 153); list-style: decimal-leading-zero outside; color: inherit; margin: 0px !important; padding: 0px 3px 0px 10px !important; background-color: rgb(245, 250, 226);"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">     <span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">item</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">name</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"android:clickable"</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">true</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"></</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">item</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(153, 153, 153); list-style: decimal-leading-zero outside; color: rgb(85, 85, 85); margin: 0px !important; padding: 0px 3px 0px 10px !important; background-color: rgb(245, 250, 226);"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">     <span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">item</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">name</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"android:scaleType"</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">center</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"></</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">item</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(153, 153, 153); list-style: decimal-leading-zero outside; color: inherit; margin: 0px !important; padding: 0px 3px 0px 10px !important; background-color: rgb(245, 250, 226);"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">     <span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">item</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">name</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"android:background"</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">@android:drawable/btn_default</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"></</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">item</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(153, 153, 153); list-style: decimal-leading-zero outside; color: rgb(85, 85, 85); margin: 0px !important; padding: 0px 3px 0px 10px !important; background-color: rgb(245, 250, 226);"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;"></</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">style</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: blue; font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li></ol></div>

3.支持图片：   

别人说 ：ImageButton支持9.png 吧~imangeView就不行了。