Solving App Crashes in Android Studio

Introduction

• Topic: Resolving app crashes in Android Studio without visible code errors.
• Disclaimer: This solution may not work 100% of the time as errors can vary.
• Current Situation: Demonstrating with a simple app containing a button and a TextView.

Simple App Code Description

• Functionality: Pressing the button changes the TextView to display "hello".
• Components: Button and TextView.
• Code: OnClick function is implemented.

Running the App

• Connection: Mobile phone connected to run the app.
• Issue: App crashes on phone despite successful installation.

Basic Troubleshooting Steps

1. Avoid Searching Online Prematurely: Try to solve the issue independently first.
2. Using Logcat:
   • Navigate to Run > Logcat.
   • Change the setting from Verbose to Error to filter error messages.
   • Look for error messages linked to specific lines of code (e.g., link-like blue underline text).

Identifying the Error

• Example: Error in mainactivity.java at line 12.
• Observation: No visible error in the code initially, but an error exists.
• Solution: Move the TextView declaration inside the function or declare it globally at the top.

Re-running the App

• Steps:
  1. Cut and paste the TextView declaration inside the OnClick function (or globally at the top).
  2. Run the app again.
• Result: App runs successfully without crashing.
• Verification:
  • Check Logcat for any errors (should show none if successful).
  • Check Verbose for any red marks (should show none).

Conclusion

• Outcome: The app runs 100% successfully without errors using the described method.
• Note: This method might not resolve all crash issues but is a common fix.
• Additional Resources: Tutorials on Python, Unity, and Android Studio available for learning.

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