Default Activity not found in Android Studio

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Have you added ACTION_MAIN intent filter to your main activity? If you don’t add this, then android won’t know which activity to launch as the main activity.

ex:

<intent-filter>
      <action android:name="android.intent.action.MAIN"/>
      <action android:name="com.package.name.MyActivity"/>
      <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

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