Activity with transparent background

Question

what I want to achieve is activity with dialog-like transparency with 100% visibility of RelativeLayout content. This is activity\'s xml:

Answer 1

I added android:background="#c0000000" to LinearLayout. Now background is transparent as I wanted to, but also TextViews inside RelativeLayout are also transparent.. how to change it?

Add a solid background to your RelativeLayout element. This way the RelativeLayout will have a solid background, and only the margins will be transparent.

Answer 2

After setting LinearLayout transparency try to set it's child transparency to the value that you want. This should make them have different transparency than LinearLayout. Try it.

Answer 3

Create Style

<style name="MyTransparentTheme" parent="android:Theme.Dialog">
       <item name="android:windowIsTranslucent">true</item>
       <item name="android:windowBackground">@android:color/transparent</item>
       <item name="android:windowContentOverlay">@null</item>
       <item name="android:windowNoTitle">true</item>
       <item name="android:windowIsFloating">true</item>
       <item name="android:backgroundDimEnabled">false</item>

this is manifest:

<activity
            android:name="your package.activity"
            android:theme="@style/MyTransparentTheme">
        </activity>

Answer 4

If your activity needs to extends from AppCompatActivity, you can create a custom style for your activity

<style name="transparentActivity" parent="Theme.AppCompat.NoActionBar">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:colorBackgroundCacheHint">@null</item>
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowAnimationStyle">@android:style/Animation</item>
    <item name="android:windowTranslucentStatus">true</item>
    <item name="android:statusBarColor">@android:color/transparent</item>
</style>

And then change the default style of your activity in the Manifest

<activity android:name=".MyActivity"
        android:theme="@style/transparentActivity"/>

Otherwise, if you do not need your activity to extend from AppCompatActivity, just change the theme of your activity in the manifest in this way.

<activity android:name=".MyActivity"
        android:theme="@android:style/Theme.Translucent.NoTitleBar"/>

Answer 5

Try to set

    getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

in your activity.

You can also try to do this in a style:

 <style name="AppTheme" parent="@android:style/Theme.Translucent.NoTitleBar">
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:colorBackgroundCacheHint">@null</item>
</style>

Answer 6

Add the following style In your res/values/styles.xml file (if you don’t have one, create it.) Here’s a complete file:

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <style name="Theme.Transparent" parent="android:Theme">
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowBackground">@color/transparent</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowIsFloating">true</item>
    <item name="android:backgroundDimEnabled">false</item>
  </style>
</resources>

(the value @color/transparent is the color value #00000000 which I put in res/values/color.xml file. Later versions of Android define a transparent color for you, so with those versions you can use @android:color/transparent directly in the style and skip the color.xml step (note the additional android: in the definition))

Then apply the style to your activity, for example:

<activity android:name=".SampleActivity" android:theme="@style/Theme.Transparent">
...
</activity>

Taken from here.