I see three possible ways to answer your problem:
1. Have you checked the manifest.xml file? Field <i>
<category android:name="android.intent.category.LAUNCHER" />
must be present inside your "main" activity, otherwise it will not start in emulation mode.
2. Your AVD machine is slightly damaged or the ADB is unstable: Check this problem.
3. Your project may be incorrect: Try to clear (project-> clear) your project, as well as rebuild it and restart AVD.
Hope this helps you in some way ...; D
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