Develop Reference

Translucent theme resulting in black background

I have created a transparent activity with following style:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.AppCompat.Translucent" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:background">#00000000</item>
<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:windowIsFloating">true</item>
<item name="android:windowAnimationStyle">#android:style/Animation</item>
</style>
</resources>
But I am getting black background when I open bottomsheet in that activity. Why I am getting this issue

How to make an activity background completely transparent (not translucent)?

In my android activity, I need to make the background of the activity transparent. For that, I found solutions online saying to do this in theme.
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
However this makes the activity background translucent i.e it isn't perfectly transparent, it is slightly grey. Is there a way to get a perfectly transparent background such that the screen below it is perfectly viisible. Thanks!

Try this
<item name="android:colorBackgroundCacheHint">#null</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">#color/transparent</item>

Try this
<style name="TransparentTheme.Base" parent="Theme.AppCompat.DayNight.NoActionBar">
<item name="colorPrimary">#color/primary</item>
<item name="colorPrimaryDark">#color/primaryDark</item>
<item name="colorAccent">#color/accent</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:backgroundDimEnabled">false</item>
</style>
Usage
<activity
android:name=".activity"
android:theme="#style/TransparentTheme.Base" />

Change my customize theme into transparent theme for my activity

I have this customized theme which I want to convert into Transparent theme
<resources>
<style name="MyMaterialTheme" parent="MyMaterialTheme.Base"></style>
<style name="MyMaterialTheme.Base"
parent="Theme.AppCompat.Light.DarkActionBar">
<item name="windowNoTitle">true</item>
<item name="windowActionBar">false</item>
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item> </style>
</resources>

Do the following
<?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">#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>
</style>
</resources>
The value #color/transparent is the color value #00000000 which I put in res/values/color.xml file. You can also use #android:color/transparent in later Android versions.
Then apply the style to your Activity, for example:
<activity android:name=".SampleActivity" android:theme="#style/Theme.Transparent">
...
</activity>

Add this style in your `values/styles.xml
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
And the following in `values/styles.xml
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
</style>

Try putting these items
<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>

style.xml android:windowIsTranslucent dialogs not showing

I have created a transparent AppCompatActivity that is a type of 'launcher' activity for other activities. This launcher activity uses a transparent style as found with other stackoverflow questions.
<style name="Theme.AppCompat.Translucent" parent="Theme.AppCompat.Light.NoActionBar">
<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>
</style>
<style name="AppCompatAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
<item name="colorAccent">#color/primary</item>
</style>
Sometimes this launcher activity needs to show a progress dialog. However, the progress dialog does not show up when I use the tag android:windowIsTranslucent. Commenting out this tag allows the progress dialog to appear, but the activity is no longer transparent.
Is there some sort of alternative solution for this?

I didn't tried this solution, But i think this could work.
Just add <item name="android:windowIsTranslucent">false</item> in your AppCompatAlertDialogStyle
Solution would be like
<style name="Theme.AppCompat.Translucent" parent="Theme.AppCompat.Light.NoActionBar">
<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>
</style>
<style name="AppCompatAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
<item name="colorAccent">#color/primary</item>
<item name="android:windowIsTranslucent">false</item>
</style>

Applying Styles Android

I want to make my Activity appear like a Dialog box, but without the title bar. So I think I should write this style myself.
But how should this XML style be?
I already tried the Theme.Dialog for my Activity, but the thing is, I don't want the background of the Theme.Dialog style. And without an label for screen.
I has all the screen build by XML, I want just center it on screen and has a semi-transparent outside background.

Just do this
<activity android:name=".MyActivity"
android:theme="#style/CustomTheme"
android:label="Gana"/>
res/values/styles.xml
<resources>
<style name="CustomTheme" parent="android:Theme.Dialog">
<item name="android:windowNoTitle">true</item>
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:background">#drawable/mybackground</item>
<item name="android:gravity">center</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowFrame">#null</item>
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:windowIsFloating">true</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:windowAnimationStyle">#android:style/Animation.Dialog</item>
<item name="android:backgroundDimEnabled">true</item>
<item name="android:background">#android:color/transparent</item>
</style>
If you don't want background remove that.