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Navigation: Delegate the back navigation to the OS if there is no screen to navigate back to. #180

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Navigation: Delegate the back navigation to the OS if there is no screen to navigate back to. #180

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14 changes: 11 additions & 3 deletions app/src/main/java/org/fairscan/app/MainActivity.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -481,10 +481,18 @@ class MainActivity : ComponentActivity() {
back = {
val origin = viewModel.currentScreen.value
viewModel.navigateBack()

// If there is nothing to navigate back to, exit the app.
val destination = viewModel.currentScreen.value
if (destination == origin && launchMode == LaunchMode.EXTERNAL_SCAN_TO_PDF) {
setResult(RESULT_CANCELED)
finish()
if (destination == origin) {
if (launchMode == LaunchMode.EXTERNAL_SCAN_TO_PDF) {
setResult(RESULT_CANCELED)
finish()
} else {
// Delegate to OS back handler instead of finishing
// to benefit from activity caching for the next start.
onBackPressedDispatcher.onBackPressed()
}
}
}
)
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