来自 Play 管理中心的 android.content.ActivityNotFoundException 崩溃报告

Question

Stacktrace:

android.content.ActivityNotFoundException: 
  at android.app.Instrumentation.checkStartActivityResult (Instrumentation.java:1878)
  at android.app.Instrumentation.execStartActivity (Instrumentation.java:1545)
  at android.app.Activity.startActivityForResult (Activity.java:4283)
  at androidx.activity.ComponentActivity.startActivityForResult (ComponentActivity.java)
  at androidx.core.app.ActivityCompat.startActivityForResult (ActivityCompat.java)
  at androidx.activity.ComponentActivity$2.onLaunch (ComponentActivity.java)
  at androidx.activity.result.ActivityResultRegistry$2.launch (ActivityResultRegistry.java)
  at androidx.fragment.app.Fragment$9.launch (Fragment.java)
  at androidx.activity.result.ActivityResultLauncher.launch (ActivityResultLauncher.java)
  at cyberdynesoftware.jahresurlaubapp.YearFragment.lambda$showSchoolVacationDialog$5 (YearFragment.java)
  at cyberdynesoftware.jahresurlaubapp.YearFragment.lambda$showSchoolVacationDialog$5$YearFragment (YearFragment.java)
  at cyberdynesoftware.jahresurlaubapp.-$$Lambda$YearFragment$FLinyacBVg2yJZUeB9ggaBhktlA.onClick (lambda)
  at com.android.internal.app.AlertController$ButtonHandler.handleMessage (AlertController.java:173)
  at android.os.Handler.dispatchMessage (Handler.java:102)
  at android.os.Looper.loop (Looper.java:158)
  at android.app.ActivityThread.main (ActivityThread.java:7224)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1230)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1120)

Unfortunately I couldn't reproduce the error locally. The stacktrace stems from Play Console; it happend on a Samsung Galaxy S5. This is the relevant part of the code in YearFragment:

private void showSchoolVacationDialog() {
    new AlertDialog.Builder(requireContext())
            .setTitle(R.string.schoolVacation)
            .setMessage(R.string.schoolVacationDialogMessage)
            .setPositiveButton(R.string.choose, (dialog, which) -> {
                activityResult.launch("text/calendar");
                dialog.dismiss();
            })
            .setNegativeButton(R.string.clear, (dialog, which) -> {
                db.schoolVacationDao().deleteAll();
                adapter.notifyDataSetChanged();
                dialog.dismiss();
            })
            .create()
            .show();
}

private final ActivityResultLauncher<String> activityResult = registerForActivityResult(
        new ActivityResultContracts.GetContent(),
        result -> {
            if (result != null)
                try {
                    InputStream inputStream = requireContext().getContentResolver().openInputStream(result);
                    if (inputStream != null) {
                        Scanner scanner = new Scanner(inputStream).useDelimiter("\\A");
                        addSchoolVacationToDB(iCalParser.parse(scanner.next()));
                        scanner.close();
                        inputStream.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
        });

Why does this happen? Is there anything fishy with my code?

Answer 1

As per the documentation on launch() :

This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.

While any of the ActivityResultContracts (such as the GetContent one you're using) should be available on every device, users may be running a custom build of Android that removes the apps / system utilities that handle these common intents or the user may have manually disabled the app (this is more common with things like a Browser or Camera app than this particular case).

Therefore you should consider surrounding your call to launch() with a try / catch block that catches an ActivityNotFoundException and informs the user that their device does not support this functionality.