Fix calls to unsupported API functions

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/adapter/GBDeviceAdapterv2.java

@@ -79,6 +79,7 @@ import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Hashtable;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
@@ -145,29 +146,24 @@ public class GBDeviceAdapterv2 extends ListAdapter<GBDevice, GBDeviceAdapterv2.V
     }
 
     private List<GBDevice> enrichDeviceListWithFolder(List<GBDevice> deviceList) {
-        ArrayList<GBDevice> enrichedList = new ArrayList<>();
-        Set<String> folders = new ArraySet<>();
-        for(GBDevice device : deviceList){
-            String parentFolder = device.getParentFolder();
-            if(StringUtils.isNullOrEmpty(parentFolder)){
+        final Map<String, List<GBDevice>> devicesPerFolder = new LinkedHashMap<>();
+        final List<GBDevice> enrichedList = new ArrayList<>();
+
+        for (GBDevice device : deviceList) {
+            String folder = device.getParentFolder();
+            if (StringUtils.isNullOrEmpty(folder)){
                 enrichedList.add(device);
                 continue;
             }
-            folders.add(parentFolder);
+            if (!devicesPerFolder.containsKey(folder)) {
+                devicesPerFolder.put(folder, new ArrayList<>());
+            }
+            devicesPerFolder.get(folder).add(device);
         }
 
-        for(String folder : folders){
-            enrichedList.add(new GBDeviceFolder(folder));
-            for(GBDevice potentialChild : deviceList){
-                String parentFolder = potentialChild.getParentFolder();
-                if(StringUtils.isNullOrEmpty(parentFolder)){
-                    continue;
-                }
-                if(!parentFolder.equals(folder)){
-                    continue;
-                }
-                enrichedList.add(potentialChild);
-            }
+        for (final Map.Entry<String, List<GBDevice>> folder : devicesPerFolder.entrySet()) {
+            enrichedList.add(new GBDeviceFolder(folder.getKey()));
+            enrichedList.addAll(folder.getValue());
         }
 
         return enrichedList;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/qhybrid/HybridHRWatchfaceWidgetActivity.java

@@ -93,7 +93,7 @@ public class HybridHRWatchfaceWidgetActivity extends AbstractSettingsActivity {
             super.onCreate(savedInstanceState);
             addPreferencesFromResource(R.xml.fossil_hr_widget_settings);
 
-            widgetTypes = HybridHRWatchfaceWidget.getAvailableWidgetTypes(getContext());
+            widgetTypes = HybridHRWatchfaceWidget.getAvailableWidgetTypes(getActivity().getBaseContext());
             ListPreference widgetType = (ListPreference) findPreference("pref_hybridhr_widget_type");
             widgetType.setOnPreferenceChangeListener(this);
             widgetType.setEntries(widgetTypes.values().toArray(new String[0]));

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/qhybrid/requests/fossil_hr/image/ImageConverter.java

@@ -105,14 +105,14 @@ public class ImageConverter {
     public static Bitmap decodeFromRLEImage(byte[] rleImage) {
         ByteBuffer buf = ByteBuffer.wrap(rleImage);
         buf.order(ByteOrder.LITTLE_ENDIAN);
-        int width = Byte.toUnsignedInt(buf.get());
-        int height = Byte.toUnsignedInt(buf.get());
+        int width = buf.get() & 0xff;
+        int height = buf.get() & 0xff;
         Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
         int posX = 0;
         int posY = 0;
         while (buf.remaining() > 2) {
-            int repetitions = Byte.toUnsignedInt(buf.get());
-            int pixel = Byte.toUnsignedInt(buf.get());
+            int repetitions = buf.get() & 0xff;
+            int pixel = buf.get() & 0xff;
             int color = pixel << 6;
             int combinedColor = Color.rgb(color, color, color);
             for (int i=0; i<repetitions; i++) {
@@ -139,7 +139,7 @@ public class ImageConverter {
         int posX = 239;
         int posY = 239;
         while (buf.remaining() > 0) {
-            int currentPixels = Byte.toUnsignedInt(buf.get());
+            int currentPixels = buf.get() & 0xff;
             for (int shift=6; shift>=0; shift-=2) {
                 int color = ((currentPixels >> shift) & 0b00000011) << 6;
                 int combinedColor = Color.rgb(color, color, color);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/Optional.java

@@ -0,0 +1,62 @@
+/*  Copyright (C) 2022 José Rebelo
+
+    This file is part of Gadgetbridge.
+
+    Gadgetbridge is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Gadgetbridge is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+package nodomain.freeyourgadget.gadgetbridge.util;
+
+import java.util.NoSuchElementException;
+import java.util.Objects;
+
+/**
+ * An API21-compatible alternative to java.util.Optional.
+ */
+public final class Optional<T> {
+    private final T value;
+
+    private Optional() {
+        this.value = null;
+    }
+
+    private Optional(final T value) {
+        this.value = Objects.requireNonNull(value);
+    }
+
+    public T get() {
+        if (value == null) {
+            throw new NoSuchElementException("No value present");
+        }
+        return value;
+    }
+
+    public boolean isPresent() {
+        return value != null;
+    }
+
+    public T orElse(final T other) {
+        return value != null ? value : other;
+    }
+
+    public static <T> Optional<T> empty() {
+        return new Optional<>();
+    }
+
+    public static <T> Optional<T> of(final T value) {
+        return new Optional<>(value);
+    }
+
+    public static <T> Optional<T> ofNullable(final T value) {
+        return value == null ? empty() : of(value);
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/language/impl/KoreanTransliterator.java

@@ -16,10 +16,9 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 package nodomain.freeyourgadget.gadgetbridge.util.language.impl;
 
-import java.util.Optional;
 import java.text.Normalizer;
-import java.text.Normalizer.Form;
 
+import nodomain.freeyourgadget.gadgetbridge.util.Optional;
 import nodomain.freeyourgadget.gadgetbridge.util.language.Transliterator;
 
 // Implements Revised Romanization of Korean as well as we can without understanding any grammar.