How do I create a transparent Activity on Android?

Question

I want to create a transparent Activity on top of another activity.

How can I achieve this?

Answer 1

Assign the translucent theme to the activity that you want to make transparent in the Android manifest file of your project:

<activity
    android:name="YOUR COMPLETE ACTIVITY NAME WITH PACKAGE"
    android:theme="@android:style/Theme.Translucent.NoTitleBar" />

Answer 2

Just let the activity background image be transparent. Or add the theme in the XML file:

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

Answer 3

There're two ways:

1. Using Theme.NoDisplay
2. Using Theme.Translucent.NoTitleBar

Using Theme.NoDisplay will still work… but only on older Android devices. On Android 6.0 and higher, using Theme.NoDisplay without calling finish() in onCreate() (or, technically, before onResume()) will crash your app. This is why the recommendation is to use Theme.Translucent.NoTitleBar, which does not suffer from this limitation.”

Answer 4

in addition to the above answers:

to avoid android Oreo related crash on activity

<style name="AppTheme.Transparent" parent="@style/Theme.AppCompat.Dialog">
    <item name="windowNoTitle">true</item>
    <item name="android:windowCloseOnTouchOutside">false</item>
</style>

<activity
     android:name="xActivity"
     android:theme="@style/AppTheme.Transparent" />

Answer 5

If you are using AppCompatActivity then add this in styles.xml

<style name="TransparentCompat" parent="@style/Theme.AppCompat.Light.DarkActionBar">
    <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>
</style>

In manifest file you can add this theme to activity tag like this

android:theme="@style/TransparentCompat"

for more details read this article

Answer 6

Assign it the Translucent theme

android:theme="@android:style/Theme.Translucent.NoTitleBar"