问题描述
我有两个图像视图.我为一个图像视图设置了背景，我为一个图像视图设置了 src .但是两者看起来都不一样，而且当我按下带有背景设置的图像视图时，它也没有显示选择.谁能解释为什么会这样?
I have two imageviews. I have set background for one image view and I have set src for one image view . But both are looking differnt and also when i press the imageview with background set it is not showing the selection. can anyone explain why this happens ?
<ImageButton android:layout_width="250dp"
android:layout_height="100dp"
android:background="@drawable/perm_group_camera"/>
<ImageButton android:layout_width="250dp"
android:layout_height="100dp"
android:adjustViewBounds="true"
android:src="@drawable/perm_group_calendar"/>
推荐答案
但两者看起来不同
But both are looking differnt
首先，drawables是不同的.
First, the drawables are different.
其次，背景总是缩放到视图的大小.
Second, the background always scales to the size of the view.
当我按下带有背景设置的图像视图时，它不显示选择.谁能解释为什么会发生这种情况
when i press the imageview with background set it is not showing the selection. can anyone explain why this happens
选择效果是因为默认情况下，背景是一个StateListDrawable 在 state_pressed 中具有不同的外观.您的自定义背景在所有州看起来都一样.您可以使用 在 xml 中创建 StateListDrawables选择器.
The selection effect is because by default, the background is a StateListDrawable with a different appearance in state_pressed. Your custom background looks the same in all states. You can create StateListDrawables in xml with a selector.
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