Sketchware Guide

Fix App Closing Issues

Free
Tutorial
Step-by-Step Guide
Quick Tips & Causes

App closing issues can be frustrating. Watch the video below or follow the text guide.

Step 01
Create Blank Testing Screen
Create a new blank screen in Sketchware. Add a button that leads to your main screen. This helps verify if the crash happens on startup or inside the main screen logic.
Step 02
Change Launch Activity
Go to Android Manifest and set your new blank screen as the Launch Activity.
Step 03
Build & Debug
If the app opens fine but crashes when clicking the button, the error is in your Main Screen components or logic.
Step 04
Verify Package Name
Ensure your package name (e.g., com.comp.app) is all lowercase. Capital letters like Com.App often cause crashes.

Summary of common reasons why Sketchware apps close unexpectedly.

Case Sensitivity Package names must be strictly lowercase.
Logic Errors Null pointers in 'OnCreate' are the #1 cause of crashes.
Manifest Incorrect launch activity configuration.
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