How to create Transparent Activity in Android?

You have to add the following style In your res/values/styles.xml file (if you don’t have one, create it.) Here’s a  gnobal code from stackoverflow.

<?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.xmlfile. 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>

Another way to make transparentable, like this

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

 If you want to using ShowCaseView then try this:

 https://github.com/Espiandev/ShowcaseView.

Using this:

View showcasedView = findViewById(R.id.view_to_showcase);
ViewTarget target = new ViewTarget(showcasedView);
ShowcaseView.insertShowcaseView(target, this, R.string.showcase_title, R.string.showcase_details);

Here is the best example of dwonload code from : AndroidHub4You