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When opening a document from within the app (via "Open File" or "Recent Documents"), pressing back now returns to the home screen instead of closing the app.

External file opening behavior remains unchanged - back still returns to the calling app.

Fixes #392

🤖 Generated with Claude Code

When opening a document from within the app (via "Open File" or "Recent Documents"),
pressing back now returns to the home screen instead of closing the app.

External file opening behavior remains unchanged - back still returns to the calling app.

Fixes #392

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
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claude bot commented Jul 20, 2025

Claude finished @TomTasche's task —— View job


Code Review

I've reviewed the changes to fix back button navigation for internally opened documents. Here's my analysis:

Todo List:

  • Read MainActivity.java to understand the changes
  • Analyze code quality and best practices
  • Check for potential bugs or issues
  • Evaluate performance considerations
  • Assess security concerns
  • Review test coverage implications
  • Provide comprehensive review feedback

Review Feedback

✅ Code Quality and Best Practices

  • The implementation is clean and follows Android conventions
  • Good separation of concerns between internal and external file handling
  • Clear comments explaining the logic
  • Proper fragment lifecycle management with commitNow()

⚠️ Potential Bugs or Issues

  1. Intent data reliability: The check getIntent().getData() == null at line 565 might not be reliable in all scenarios:

    if (getIntent().getData() == null) {

    Consider storing the opening source in a member variable during onCreate() or onNewIntent() to ensure the state is preserved correctly throughout the activity lifecycle.

  2. Missing null check: At line 580, analyticsManager is used without a null check:

    analyticsManager.setCurrentScreen(this, "screen_main");

    While it's likely initialized by this point, defensive programming would suggest adding a null check.

  3. Fragment transaction safety: The fragment removal at lines 571-574 could potentially fail if the activity is in an invalid state. Consider wrapping in a try-catch or checking isFinishing() first.

✅ Performance Considerations

  • Using commitNow() for immediate fragment transactions is appropriate here
  • No performance concerns with the implementation
  • The state cleanup (clearing lastUri and documentFragment) is efficient

✅ Security Concerns

  • No security issues identified
  • The implementation doesn't expose any sensitive data or create vulnerabilities

❌ Test Coverage

  • No tests included: This PR changes critical user navigation behavior but doesn't include any tests
  • Recommended test scenarios:
    • Test back button behavior when opening files from "Open File" menu
    • Test back button behavior when opening from "Recent Documents"
    • Test back button behavior when opening files from external apps
    • Test state preservation across configuration changes
    • Test edge cases like rapid back button presses

💡 Suggestions for Improvement

  1. Consider adding a more robust way to track the document opening source:

    private boolean isInternallyOpened = false;
    
    // Set this flag when opening from internal sources
  2. Add instrumentation tests to verify the navigation behavior works correctly

  3. Consider adding a feature flag or remote config to rollback this behavior if needed

Summary

The implementation correctly addresses the issue described in #392. The code is clean and follows Android best practices. However, the lack of tests for this user-facing navigation change is concerning. I recommend adding UI tests before merging to ensure the behavior works as expected across different scenarios.

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App closes on going back from document view

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