In the model drop-down box, select the app if there is no app drop-down box, (no project name), then please go to settings:
Android Studio 3.3.0 File-> sync project with gradles files; ( older versions of AS may be the tools -> Android-> sync project with gradles files;)
updated well. Return to this step, model, select the app, just fine.
Default Activity not found: Could not identify launch activity - sometimes, also run error may occur
At this time, in the last page
launch option in the set specified activity like.
For now, the problem is that these. solved.