EditTextPreference - only numeric value inputType - isn't working

Answer 1

The Customize your settings section in the developer guide for settings recommends that you set the input type programmatically by using an OnBindEditTextListener as follows:

public class SettingsFragment extends PreferenceFragmentCompat {
    @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
        setPreferencesFromResource(R.xml.settings_screen, rootKey);

        EditTextPreference weeklyGoalPref = findPreference("weekly_goal");
        if (weeklyGoalPref != null) {
            weeklyGoalPref.setOnBindEditTextListener(new EditTextPreference.OnBindEditTextListener() {
                @Override
                public void onBindEditText(@NonNull EditText editText) {
                    editText.setInputType(InputType.TYPE_CLASS_NUMBER);
                }
            });
        }
    }
}

I tried defining the input type as "number" in xml and still got the normal keyboard with letters. This approach worked for me.

Answer 2

Thought I'd add my solution for Android-TV in case someone gets here and needs it. android_su's reply put me in the right direction, unfortunately, the LeanbackEditTextPreferenceDialogFragmentCompat doesn't support OnPreferenceDisplayDialogCallback. Instead I had to:

override onCreateView and implement a new newInstance function for LeanbackEditTextPreferenceDialogFragmentCompat using inheritance:

public static class TvPreferencesDialog extends LeanbackEditTextPreferenceDialogFragmentCompat {

    public static TvPreferencesDialog newInstance(String key) {
        final Bundle args = new Bundle(1);
        args.putString(ARG_KEY, key);

        final TvPreferencesDialog fragment = new TvPreferencesDialog();
        fragment.setArguments(args);

        return fragment;
    }

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View root = super.onCreateView(inflater, container, savedInstanceState);
        final String key = getArguments().getString(ARG_KEY);
        EditText editTextView = root.findViewById(android.R.id.edit);

        if (key.equalsIgnoreCase("some pref key 1")) {
            editTextView.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);
        } else if (key.equalsIgnoreCase("some pref key 2")) {
            editTextView.setInputType(InputType.TYPE_CLASS_NUMBER);
            editTextView.addTextChangedListener(new MyTextWatcher());
        }

        return root;
    }    
}

override onPreferenceDisplayDialog inside my LeanbackSettingsFragmentCompat:

@Override
public boolean onPreferenceDisplayDialog(@NonNull PreferenceFragmentCompat caller, Preference pref) {
    if (caller == null) {
        throw new IllegalArgumentException("Cannot display dialog for preference " + pref + ", Caller must not be null!");
    }
    final Fragment f;
    if (pref instanceof EditTextPreference) {
        f = TvPreferencesDialog.newInstance(pref.getKey());
        f.setTargetFragment(caller, 0);
        startPreferenceFragment(f);
        return true;
    } else {
        return super.onPreferenceDisplayDialog(caller, pref);
    }
}