widgets: add minimal widget [#8]

Add the first widget implementation, the minimal widget. This took a
good 2 days of hacking and frustration to get the first prototype
working. And even then, its currently scoped to android 12 until I'm
able to port them. The implementation is still quite rough, but should
become manageable over time. More widgets will come.

app/src/main/AndroidManifest.xml

@@ -7,8 +7,10 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
 
-    <!-- Workaround for ExoPlayer's online functionality requiring unnecessary permissions -->
+    <!-- Workaround for ExoPlayer requiring unnecessary permissions -->
-    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" tools:node="remove"/>
+    <uses-permission
+        android:name="android.permission.ACCESS_NETWORK_STATE"
+        tools:node="remove" />
 
     <queries />
 
@@ -21,12 +23,13 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Base">
+
         <activity
             android:name=".MainActivity"
+            android:exported="true"
             android:icon="@mipmap/ic_launcher"
             android:launchMode="singleTask"
             android:roundIcon="@mipmap/ic_launcher_round"
-            android:exported="true"
             android:windowSoftInputMode="adjustPan">
 
             <intent-filter>
@@ -46,10 +49,25 @@
                 <data android:mimeType="audio/*" />
             </intent-filter>
         </activity>
+
         <service
             android:name=".playback.system.PlaybackService"
             android:foregroundServiceType="mediaPlayback"
             android:icon="@mipmap/ic_launcher"
             android:roundIcon="@mipmap/ic_launcher_round" />
+
+        <receiver
+            android:name=".widget.MinimalWidgetProvider"
+            android:exported="false"
+            android:enabled="@bool/widgets_supported">
+
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/widget_minimal" />
+        </receiver>
     </application>
 </manifest>

app/src/main/java/org/oxycblt/auxio/MainActivity.kt

@@ -19,6 +19,9 @@ import org.oxycblt.auxio.ui.isNight
 
 /**
  * The single [AppCompatActivity] for Auxio.
+ * TODO: Port widgets to non-12 android
+ * TODO: Change how I handle lifecycle owners
+ * TODO: Fix intent issues
  */
 class MainActivity : AppCompatActivity() {
     private val playbackModel: PlaybackViewModel by viewModels()

app/src/main/java/org/oxycblt/auxio/library/LibraryAdapter.kt

@@ -1,5 +1,6 @@
 package org.oxycblt.auxio.library
 
+import android.annotation.SuppressLint
 import android.view.View
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
@@ -61,6 +62,7 @@ class LibraryAdapter(
     /**
      * Update the data with [newData]. [notifyDataSetChanged] will be called.
      */
+    @SuppressLint("NotifyDataSetChanged")
     fun updateData(newData: List<Parent>) {
         data = newData
 

app/src/main/java/org/oxycblt/auxio/playback/system/PlaybackService.kt

@@ -33,6 +33,7 @@ import kotlinx.coroutines.flow.conflate
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.takeWhile
 import kotlinx.coroutines.launch
+import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.logD
 import org.oxycblt.auxio.music.Parent
 import org.oxycblt.auxio.music.Song
@@ -41,6 +42,8 @@ import org.oxycblt.auxio.playback.state.LoopMode
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
 import org.oxycblt.auxio.settings.SettingsManager
 import org.oxycblt.auxio.ui.getSystemServiceSafe
+import org.oxycblt.auxio.widget.BaseWidget
+import org.oxycblt.auxio.widget.MinimalWidgetProvider
 
 /**
  * A service that manages the system-side aspects of playback, such as:
@@ -48,26 +51,36 @@ import org.oxycblt.auxio.ui.getSystemServiceSafe
  * - The [MediaSessionCompat]
  * - The Media Notification
  * - Headset management
+ * - Widgets
  *
  * This service relies on [PlaybackStateManager.Callback] and [SettingsManager.Callback],
  * so therefore there's no need to bind to it to deliver commands.
  * @author OxygenCobalt
  */
 class PlaybackService : Service(), Player.Listener, PlaybackStateManager.Callback, SettingsManager.Callback {
+
+    // Player components
     private lateinit var player: SimpleExoPlayer
     private lateinit var mediaSession: MediaSessionCompat
     private lateinit var connector: PlaybackSessionConnector
 
+    // Notification components
     private lateinit var notification: PlaybackNotification
     private lateinit var notificationManager: NotificationManager
 
+    // System backend components
     private lateinit var audioReactor: AudioReactor
     private lateinit var wakeLock: PowerManager.WakeLock
     private val systemReceiver = SystemEventReceiver()
 
+    // Managers
     private val playbackManager = PlaybackStateManager.getInstance()
     private val settingsManager = SettingsManager.getInstance()
 
+    // Widgets
+    private val minimalWidget = MinimalWidgetProvider.new()
+
+    // State
     private var isForeground = false
 
     private val serviceJob = Job()
@@ -81,8 +94,8 @@ class PlaybackService : Service(), Player.Listener, PlaybackStateManager.Callbac
         return START_NOT_STICKY
     }
 
-    // No binding, service is headless.
+    // No binding, service is headless
-    // Deliver updates through PlaybackStateManager/SettingsManager instead.
+    // Communicate using PlaybackStateManager, SettingsManager, or Broadcasts instead.
     override fun onBind(intent: Intent): IBinder? = null
 
     override fun onCreate() {
@@ -128,6 +141,8 @@ class PlaybackService : Service(), Player.Listener, PlaybackStateManager.Callbac
             addAction(AudioManager.ACTION_AUDIO_BECOMING_NOISY)
             addAction(Intent.ACTION_HEADSET_PLUG)
 
+            addAction(BaseWidget.ACTION_WIDGET_UPDATE)
+
             registerReceiver(systemReceiver, this)
         }
 
@@ -231,11 +246,14 @@ class PlaybackService : Service(), Player.Listener, PlaybackStateManager.Callbac
                 this, song, settingsManager.colorizeNotif, ::startForegroundOrNotify
             )
 
+            minimalWidget?.update(this, playbackManager)
+
             return
         }
 
-        // Stop playing/the notification if there's nothing to play.
+        // Clear if there's nothing to play.
         player.stop()
+        minimalWidget?.stop(this)
         stopForegroundAndNotification()
     }
 
@@ -476,6 +494,15 @@ class PlaybackService : Service(), Player.Listener, PlaybackStateManager.Callbac
                         DISCONNECTED -> pauseFromPlug()
                     }
                 }
+
+                // Newly added widgets need PlaybackService to
+                BaseWidget.ACTION_WIDGET_UPDATE -> {
+                    when (intent.getIntExtra(BaseWidget.KEY_WIDGET_TYPE, -1)) {
+                        MinimalWidgetProvider.TYPE -> minimalWidget?.update(
+                            this@PlaybackService, playbackManager
+                        )
+                    }
+                }
             }
         }
 
@@ -507,5 +534,7 @@ class PlaybackService : Service(), Player.Listener, PlaybackStateManager.Callbac
         private const val CONNECTED = 1
         private const val WAKELOCK_TIME = 25000L
         private const val POS_POLL_INTERVAL = 500L
+
+        const val BROADCAST_WIDGET_START = BuildConfig.APPLICATION_ID + ".key.WIDGETS_START"
     }
 }

app/src/main/java/org/oxycblt/auxio/ui/SlideLinearLayout.kt

@@ -1,5 +1,6 @@
 package org.oxycblt.auxio.ui
 
+import android.annotation.SuppressLint
 import android.content.Context
 import android.graphics.Canvas
 import android.util.AttributeSet
@@ -24,7 +25,11 @@ class SlideLinearLayout @JvmOverloads constructor(
     attrs: AttributeSet? = null,
     defStyleAttr: Int = -1
 ) : LinearLayout(context, attrs, defStyleAttr) {
+    @SuppressLint("DiscouragedPrivateApi")
     private val disappearingChildrenField: Field? = try {
+        // We need to read this field to correctly draw the disappearing children
+        // If google ever hides this API I am going to scream, because its their busted
+        // ViewGroup code that forces me to do this in the first place
         ViewGroup::class.java.getDeclaredField("mDisappearingChildren").also {
             it.isAccessible = true
         }
@@ -90,13 +95,13 @@ class SlideLinearLayout @JvmOverloads constructor(
         return true
     }
 
-    @Suppress("UNCHECKED_CAST")
     private fun getDisappearingChildren(): List<View>? {
         if (disappearingChildrenField == null || disappearingChildren != null) {
             return disappearingChildren
         }
 
         try {
+            @Suppress("UNCHECKED_CAST")
             disappearingChildren = disappearingChildrenField.get(this) as List<View>?
         } catch (e: Exception) {
             logD("Could not get list of disappearing children.")

app/src/main/java/org/oxycblt/auxio/widget/BaseWidget.kt

@@ -0,0 +1,121 @@
+package org.oxycblt.auxio.widget
+
+import android.app.PendingIntent
+import android.appwidget.AppWidgetManager
+import android.appwidget.AppWidgetProvider
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.widget.RemoteViews
+import androidx.annotation.LayoutRes
+import org.oxycblt.auxio.BuildConfig
+import org.oxycblt.auxio.MainActivity
+import org.oxycblt.auxio.R
+import org.oxycblt.auxio.logD
+import org.oxycblt.auxio.playback.state.PlaybackStateManager
+
+/**
+ * The base widget class for all widget implementations in Auxio.
+ */
+abstract class BaseWidget : AppWidgetProvider() {
+    abstract val type: Int
+
+    /*
+     * Returns the default view for this widget. This should be the "No music playing" screen
+     * in pretty much all cases.
+     */
+    protected abstract fun getDefaultViews(context: Context): RemoteViews
+
+    /*
+     * Update views based off of the playback state. This job is asynchronous and should be
+     * notified as completed by calling [onDone]
+     */
+    protected abstract fun updateViews(
+        context: Context,
+        playbackManager: PlaybackStateManager,
+        onDone: (RemoteViews) -> Unit
+    )
+
+    /*
+     * Update the widget based on the playback state.
+     */
+    fun update(context: Context, playbackManager: PlaybackStateManager) {
+        logD("Dispatching playback state update")
+
+        val manager = AppWidgetManager.getInstance(context)
+
+        // View updates are often async due to image loading, so only push the views
+        // when the callback is called.
+        updateViews(context, playbackManager) { views ->
+            manager.applyViews(context, views)
+        }
+    }
+
+    /*
+     * Stop this widget, reverting it to its default state.
+     */
+    fun stop(context: Context) {
+        logD("Stopping widget")
+
+        val manager = AppWidgetManager.getInstance(context)
+        manager.applyViews(context, getDefaultViews(context))
+    }
+
+    override fun onUpdate(
+        context: Context,
+        appWidgetManager: AppWidgetManager,
+        appWidgetIds: IntArray
+    ) {
+        appWidgetManager.applyViews(context, getDefaultViews(context))
+
+        logD("Sending update intent to PlaybackService")
+
+        val intent = Intent(ACTION_WIDGET_UPDATE)
+            .putExtra(KEY_WIDGET_TYPE, type)
+            .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY)
+
+        context.sendBroadcast(intent)
+    }
+
+    protected fun getRemoteViews(context: Context, @LayoutRes layout: Int): RemoteViews {
+        val views = RemoteViews(context.packageName, layout)
+
+        views.setOnClickPendingIntent(
+            android.R.id.background,
+            PendingIntent.getActivity(
+                context, 0xA0A0, Intent(context, MainActivity::class.java),
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) PendingIntent.FLAG_IMMUTABLE else 0
+            )
+        )
+
+        return views
+    }
+
+    private fun AppWidgetManager.applyViews(context: Context, views: RemoteViews) {
+        val ids = getAppWidgetIds(ComponentName(context, this::class.java))
+
+        if (ids.isNotEmpty()) {
+            // Existing widgets found, update thoughs
+            ids.forEach { id ->
+                updateAppWidget(id, views)
+            }
+        } else {
+            // No existing widgets found. Fall back to the name of the widget class
+            updateAppWidget(ComponentName(context, this@BaseWidget::class.java), views)
+        }
+    }
+
+    companion object {
+        const val ACTION_WIDGET_UPDATE = BuildConfig.APPLICATION_ID + ".action.WIDGET_UPDATE"
+        const val KEY_WIDGET_TYPE = BuildConfig.APPLICATION_ID + ".key.WIDGET_TYPE"
+    }
+}
+
+// PLAN:
+// - Service calls methods on the widgets, think a subset of PlaybackStateManager.Callback
+// - Widgets send BACK broadcasts to control playback, as other parts of the code do
+// - Since widgets are broadcastrecievers, this is okay, shouldn't cause memory leaks
+// - Can't use playbackstatemanager here since that would make the app unkillable
+// - Callbacks also need to handle PlaybackService dying and being unable to send any
+// more updates, and PlaybackService starting up as well

app/src/main/java/org/oxycblt/auxio/widget/MinimalWidgetProvider.kt

@@ -0,0 +1,80 @@
+package org.oxycblt.auxio.widget
+
+import android.content.Context
+import android.os.Build
+import android.view.View
+import android.widget.RemoteViews
+import org.oxycblt.auxio.R
+import org.oxycblt.auxio.coil.loadBitmap
+import org.oxycblt.auxio.logD
+import org.oxycblt.auxio.playback.state.PlaybackStateManager
+
+// Workaround to make studio shut up about perfectly valid layouts somehow
+// being invalid for remote views.
+
+/**
+ * The minimal widget. This widget only shows the album, song name, and artist without any
+ * controls. Because you know. Minimalism.
+ */
+class MinimalWidgetProvider : BaseWidget() {
+    override val type: Int get() = TYPE
+
+    override fun getDefaultViews(context: Context): RemoteViews {
+        val views = getRemoteViews(context, LAYOUT)
+
+        views.setInt(R.id.widget_cover, "setImageResource", R.drawable.ic_song_clear)
+        views.setInt(R.id.widget_cover, "setVisibility", View.VISIBLE)
+        views.setInt(R.id.widget_placeholder_msg, "setVisibility", View.VISIBLE)
+        views.setInt(R.id.widget_meta, "setVisibility", View.GONE)
+
+        return views
+    }
+
+    override fun updateViews(
+        context: Context,
+        playbackManager: PlaybackStateManager,
+        onDone: (RemoteViews) -> Unit
+    ) {
+        val views = getRemoteViews(context, LAYOUT)
+        val song = playbackManager.song
+
+        if (song != null) {
+            logD("updating view to ${song.name}")
+
+            // Show the proper widget views
+            views.setInt(R.id.widget_placeholder_msg, "setVisibility", View.GONE)
+            views.setInt(R.id.widget_meta, "setVisibility", View.VISIBLE)
+
+            // Update the metadata
+            views.setTextViewText(R.id.widget_song, song.name)
+            views.setTextViewText(R.id.widget_artist, song.album.artist.name)
+
+            // loadBitmap is async, hence the need for onDone
+            loadBitmap(context, song) { bitmap ->
+                if (bitmap != null) {
+                    views.setBitmap(R.id.widget_cover, "setImageBitmap", bitmap)
+                } else {
+                    views.setInt(R.id.widget_cover, "setImageResource", R.drawable.ic_song_clear)
+                }
+
+                onDone(views)
+            }
+        } else {
+            views.setInt(R.id.widget_cover, "setImageResource", R.drawable.ic_song_clear)
+            onDone(views)
+        }
+    }
+
+    companion object {
+        const val TYPE = 0xA0D0
+        const val LAYOUT = R.layout.widget_minimal
+
+        fun new(): MinimalWidgetProvider? {
+            return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+                MinimalWidgetProvider()
+            } else {
+                null
+            }
+        }
+    }
+}

app/src/main/res/drawable/ic_song_clear.xml

@@ -0,0 +1,11 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:alpha="0.3"
+    android:tint="?attr/colorPrimary"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M12 3v10.55C11.41 13.21 10.73 13 10 13c-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4V7h4V3h-6z" />
+</vector>

app/src/main/res/drawable/ui_widget_black.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <corners />
+    <solid android:color="@color/surface_black" />
+</shape>

app/src/main/res/drawable/ui_widget_day.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <corners />
+    <solid android:color="@color/surface_day" />
+</shape>

app/src/main/res/drawable/ui_widget_night.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <corners />
+    <solid android:color="@color/surface_night" />
+</shape>

app/src/main/res/layout-v31/widget_minimal.xml

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@android:id/background"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="?android:attr/colorBackground"
+    android:orientation="vertical"
+    android:theme="@style/Theme.Widget">
+
+    <android.widget.ImageView
+        android:id="@+id/widget_cover"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        android:scaleType="centerCrop"
+        tools:ignore="contentDescription"
+        tools:src="@drawable/ic_song_clear" />
+
+    <android.widget.LinearLayout
+        android:id="@+id/widget_meta"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom"
+        android:background="?android:attr/colorBackground"
+        android:orientation="vertical"
+        android:padding="@dimen/spacing_medium">
+
+        <android.widget.TextView
+            android:id="@+id/widget_song"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ellipsize="end"
+            android:singleLine="true"
+            android:textAppearance="@style/TextAppearance.MaterialComponents.Headline6"
+            android:textColor="?android:attr/textColorPrimary"
+            android:textStyle="bold"
+            tools:text="Song Name" />
+
+        <android.widget.TextView
+            android:id="@+id/widget_artist"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ellipsize="end"
+            android:singleLine="true"
+            android:textAppearance="@style/TextAppearance.MaterialComponents.Subtitle1"
+            android:textColor="?android:attr/textColorSecondary"
+            tools:text="Artist Name" />
+
+    </android.widget.LinearLayout>
+
+    <android.widget.TextView
+        android:id="@+id/widget_placeholder_msg"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:padding="@dimen/spacing_medium"
+        android:text="@string/placeholder_playback"
+        android:textAppearance="@style/TextAppearance.MaterialComponents.Headline6"
+        android:textColor="?android:attr/textColorPrimary"
+        android:textStyle="bold" />
+
+</LinearLayout>

app/src/main/res/values-night/colors.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="surface_color">#151515</color>
+    <color name="surface_color">@color/surface_night</color>
     <color name="divider_color">#323232</color>
     <color name="selection_color">#484848</color>
     <color name="inactive_color">#404040</color>

app/src/main/res/values-v31/bools.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!--
+    Widgets are limited to android 12 until I can find an okay-ish way to backport them.
+    -->
+    <bool name="widgets_supported">true</bool>
+</resources>

app/src/main/res/values-v31/styles_core.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Widget" parent="@android:style/Theme.DeviceDefault.DayNight">
+        <item name="colorPrimary">?android:attr/colorAccent</item>
+        <item name="colorSecondary">?android:attr/colorAccent</item>
+    </style>
+</resources>

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

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <bool name="widgets_supported">false</bool>
+</resources>

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

@@ -1,13 +1,20 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="surface_color">#fafafa</color>
+    <color name="surface_day">#fffafafa</color>
-    <color name="divider_color">#cbcbcb</color>
+    <color name="surface_night">#ff151515</color>
-    <color name="selection_color">#cbcbcb</color>
+    <color name="surface_black">#ff000000</color>
-    <color name="inactive_color">#c4c4c4</color>
-    <color name="control_color">#202020</color>
-    <color name="nav_color">#01fafafa</color>
 
-    <color name="surface_color_black">#000000</color>
+    <color name="text_primary_day">#ff000000</color>
+    <color name="text_secondary_day">#ff323232</color>
+    <color name="text_primary_night">#ffffffff</color>
+    <color name="text_secondary_night">#ffbebebe</color>
+
+    <color name="surface_color">@color/surface_day</color>
+    <color name="selection_color">#cbcbcb</color>
+    <color name="control_color">#202020</color>
+    <color name="divider_color">#cbcbcb</color>
+    <color name="inactive_color">#c4c4c4</color>
+    <color name="nav_color">#01fafafa</color>
 
     <!--
     Base color set derived from Music Player GO.

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

@@ -134,6 +134,7 @@
     <string name="placeholder_artist">Unknown Artist</string>
     <string name="placeholder_album">Unknown Album</string>
     <string name="placeholder_no_date">No Date</string>
+    <string name="placeholder_playback">No music playing</string>
 
     <!-- Color Label namespace | Accent names -->
     <string name="color_label_red">Red</string>

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

@@ -36,7 +36,7 @@
 
     <!-- Black theme dialog theme -->
     <style name="Theme.CustomDialog.Black" parent="Theme.CustomDialog.Base">
-        <item name="colorSurface">@color/surface_color_black</item>
+        <item name="colorSurface">@color/surface_black</item>
     </style>
 
     <!-- Material-specific dialog style -->

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

@@ -157,8 +157,6 @@
         <item name="android:thumbTint">?attr/colorPrimary</item>
     </style>
 
-
-
     <!-- Base style for the material buttons -->
     <style name="Widget.MaterialComponents.Button.Base" parent="@style/Widget.MaterialComponents.Button.TextButton">
         <item name="android:layout_width">0dp</item>

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

@@ -39,7 +39,7 @@
 
     <!-- The basic black theme derived in all black accents. -->
     <style name="Theme.Base.Black" parent="Theme.Base">
-        <item name="colorSurface">@color/surface_color_black</item>
+        <item name="colorSurface">@color/surface_black</item>
         <item name="materialAlertDialogTheme">@style/Theme.CustomDialog.Black</item>
     </style>
 </resources>

app/src/main/res/xml-v31/widget_minimal.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:initialLayout="@layout/widget_minimal"
+    android:targetCellWidth="2"
+    android:targetCellHeight="2"
+    android:minResizeWidth="110dp"
+    android:minResizeHeight="110dp"
+    android:resizeMode="horizontal|vertical"
+    android:updatePeriodMillis="0"
+    android:widgetCategory="home_screen">
+
+</appwidget-provider>