图像视图的src和背景之间的差异 [英] Difference between src and background for image view

问题描述

我有两张图片。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。但两者看起来都不一样，当我按下带有背景设置的imageview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，背景总是缩放到大小视图。

Second, the background always scales to the size of the view.

当我按下背景设置的imageview时，它没有显示选择。任何人都可以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 StateListDrawable 在<$ c中具有不同的外观$ C> state_pressed 。您的自定义背景在所有状态下看起来都相同。您可以使用 StateListDrawables rel =nofollow> 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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