Java Android 使视图透明，或至少半透明
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Android make a view transparent, or at least semi transparent
提问by Akshat
I'm using the AndroidSlidingUpPanel. I'm trying to make one of the views semi-transparent. So that you can see what's under it. So its basically a LinearLayout which moves, but I can't see whats underneath.
我正在使用AndroidSlidingUpPanel。我正在尝试使其中一个视图半透明。这样你就可以看到它下面的东西了。所以它基本上是一个移动的 LinearLayout，但我看不到下面是什么。
I've tried setting the alpha, the background color (with alpha)
我试过设置alpha背景颜色（带 alpha）
xml settings:
xml设置：
android:background="@android:color/transparent"
as well as:
也：
android:background="#22000000"
I've also tried programmatically:
我也以编程方式尝试过：
view.setAlpha((float) 0.45));
The thing is everything I do doesn't make it transparent. I can see the colours change but its still fully opaque.
问题是我所做的一切并没有使它透明。我可以看到颜色发生变化，但它仍然完全不透明。
Perhaps i've missed something? How can I make it transparent so I can see whats underneath
也许我错过了什么？我怎样才能让它透明，这样我才能看到下面是什么
回答by Android Stack
try to refer it to drawable shape as bellow :
尝试将其引用为可绘制形状，如下所示：
android:background="@drawable/transparant_layout"
android:background="@drawable/transparant_layout"
transparant_layout:
透明布局：
<?xml version="1.0" encoding="utf-8" ?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#00000000" />
</shape>
Hope this help.
希望这有帮助。
回答by Tushar
The color hex code is built like this. #ARGB or for a more fine grained control #AARRGGBB which means AlphaRedGreenBlue. Try some colour range for the transparency . the problem is with your hex code for color
颜色十六进制代码是这样构建的。#ARGB 或更细粒度的控制 #AARRGGBB，这意味着 AlphaRedGreenBlue。尝试一些颜色范围的透明度。问题在于您的颜色十六进制代码
回答by jyomin
In XML set Background attribute to any colour White(#FFFFFF) shade or Black(#000000) shade.if you want transparancy just put 80 before the actual hash code.
在 XML 中，将 Background 属性设置为任何颜色 White(#FFFFFF) 阴影或 Black(#000000) 阴影。如果您想要透明度，只需在实际哈希代码之前放置 80。
#80000000
回答by Franco
You need to add slidingpanel:overlay="true"to SlidingUpPanelLayout, and then use the color on the transparent view as you decribed (android:background="@android:color/transparent"or whatever level of transparency you want).
您需要添加slidingpanel:overlay="true"到SlidingUpPanelLayout，然后使用您描述的透明视图上的颜色（android:background="@android:color/transparent"或您想要的任何透明度级别）。
回答by Ross
Use android:alpha="0.1" to set opacity of a layout
使用 android:alpha="0.1" 设置布局的不透明度
<FrameLayout
android:id="@+id/frameLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:alpha="0.2"
android:background="#000000"
https://developer.android.com/reference/android/view/View.html#setAlpha(float)
https://developer.android.com/reference/android/view/View.html#setAlpha(float)
