oppo: show warning when selecting too few ANC modes

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/oppo/OppoHeadphonesSettingsCustomizer.java

@@ -18,9 +18,13 @@ package nodomain.freeyourgadget.gadgetbridge.devices.oppo;
 
 import android.os.Parcel;
 import android.util.Pair;
+import android.content.Context;
 
 import androidx.preference.ListPreference;
 import androidx.preference.Preference;
+import androidx.preference.MultiSelectListPreference;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -82,6 +86,22 @@ public class OppoHeadphonesSettingsCustomizer implements DeviceSpecificSettingsC
 
     @Override
     public void onPreferenceChange(final Preference preference, final DeviceSpecificSettingsHandler handler) {
+        if (OppoHeadphonesPreferences.ANC_TOUCH_CYCLE_MODES.equals(preference.getKey())) {
+            if (preference instanceof MultiSelectListPreference) {
+                final MultiSelectListPreference ancCycleModesPref = (MultiSelectListPreference) preference;
+                final Set<String> selectedValues = ancCycleModesPref.getValues();
+
+                if (selectedValues == null || selectedValues.size() < 2) {
+                    final Context context = preference.getContext();
+                    final String message = context.getString(nodomain.freeyourgadget.gadgetbridge.R.string.select_at_least_option, 2);
+                    new MaterialAlertDialogBuilder(context)
+                        .setTitle(nodomain.freeyourgadget.gadgetbridge.R.string.warning)
+                        .setMessage(message)
+                        .setPositiveButton(android.R.string.ok, null)
+                        .show();
+                }
+            }
+        }
     }
 
     @Override

app/src/main/res/values-ru/strings.xml

@@ -4526,4 +4526,5 @@
     <string name="prefs_device_id">Идентификатор устройства</string>
     <string name="persisting_samples_failed">Ошибка при сохранении образцов: %1$s</string>
     <string name="unit_kcal_per_day">ккал/день</string>
+    <string name="select_at_least_option">Пожалуйста выберите минимум %1$d варианта</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -5029,4 +5029,5 @@
     <string name="pref_category_endurain" translatable="false">Endurain</string>
     <string name="pref_category_wanderer" translatable="false">Wanderer</string>
     <string name="activity_detail_upload_to_wanderer">Upload GPX to Wanderer</string>
+    <string name="select_at_least_option">Please select at least %1$d option</string>
 </resources>