Thoughts triggered by the fact that app applications are installed on mobile phones and do not display icons

Recently at work , There's a problem ,intent-filter Can the label Merge ？ To answer this question , Just try , hold Android Start class
<intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter>
And another label A merger
Out apk after , Install on your phone , Not found icon.
Reference link
just It is the third way above .

How can we draw inferences from one instance , Keep looking at
Android in Intent Object and the Intent Filter Filter matching process details
Learn to collect .