How to remove application from recent application list?

Other attributes can help your activity isolate from other activities in the same package.

<activity 
android:name=".aActivity"
android:excludeFromRecents="true"
android:taskAffinity=""
android:launchMode="singleInstance">

try

<activity android:name=".MainActivity"
        android:excludeFromRecents="true" ...

in your AndroidManifest.xml's activity declaration.

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