How to open application to run code without showing activity

Issue

I want when the user click on my application (when he open my application) the application run java without open the application or showing any activity.

Like Fast Task killer application.

And thanks.

Solution

Create transparent activity for this

Here’s a complete file:

res/values/styles.xml

<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>

Then apply the style to your activity, for example:

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

Answered By - Divyang Divasaliwala