widgets: add preview for <31

Add an image widget preview for android versions below 12.

app/src/main/java/org/oxycblt/auxio/widgets/WidgetProvider.kt

@@ -133,13 +133,15 @@ class WidgetProvider : AppWidgetProvider() {
         } else {
             // Otherwise, we try our best to backport the responsive behavior to older versions.
             // This is mostly a guess based on RemoteView's documentation, and it has some
-            // problems [most notably UI jittering when resizing], but it works. It may be
-            // improved once Android 12's source is released.
+            // problems [most notably UI jittering when resizing]. Its better than just using
+            // one layout though. It may be improved once Android 12's source is released.
 
             // Theres a non-zero likelihood that this code ends up being copy-pasted all over
             // by other apps that are trying to refresh their widgets for Android 12. So, if
             // you're doing that than uh...hi.
 
+            // Each widget has independent dimensions, so we iterate through them all
+            // and do this for each.
             val ids = getAppWidgetIds(ComponentName(context, WidgetProvider::class.java))
 
             for (id in ids) {
@@ -170,21 +172,19 @@ class WidgetProvider : AppWidgetProvider() {
                         }
                     }
 
+                    // Find the layout with the greatest area. This is what we use.
                     val layout = candidates.maxByOrNull { it.height * it.width }
 
                     if (layout != null) {
                         logD("Using widget layout $layout")
 
-                        updateAppWidget(
-                            ComponentName(context, WidgetProvider::class.java),
-                            views[layout]
-                        )
+                        updateAppWidget(id, views[layout])
 
                         continue
                     }
                 }
 
-                // No layout works. Just use the smallest view.
+                // No layout fits. Just use the smallest view.
 
                 logD("No widget layout found")
 

app/src/main/res/layout/widget_small.xml

@@ -15,7 +15,7 @@
         android:background="?attr/colorSurface"
         android:scaleType="centerCrop"
         tools:ignore="contentDescription"
-        tools:src="@drawable/ic_song" />
+        android:src="@drawable/ic_song" />
 
     <LinearLayout
         android:layout_width="match_parent"
@@ -36,7 +36,7 @@
             android:textAppearance="@style/TextAppearance.MaterialComponents.Headline6"
             android:textColor="?android:attr/textColorPrimary"
             android:textStyle="bold"
-            tools:text="Song Name" />
+            android:text="@string/placeholder_widget_song" />
 
         <TextView
             android:id="@+id/widget_artist"
@@ -47,7 +47,7 @@
             android:singleLine="true"
             android:textAppearance="@style/TextAppearance.MaterialComponents.Subtitle1"
             android:textColor="?android:attr/textColorSecondary"
-            tools:text="Artist Name" />
+            android:text="@string/placeholder_widget_artist" />
 
         <LinearLayout
             android:layout_width="match_parent"

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

@@ -4,7 +4,7 @@
 
     <!-- Info namespace | App labels -->
     <string name="info_app_desc">A simple, rational music player for android.</string>
-    <string name="info_channel_name">Music Playback</string>
+    <string name="info_channel_name">Now Playing</string>
     <string name="info_widget_desc">See and control playing music</string>
 
     <!-- Label Namespace | Static Labels -->

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

@@ -7,4 +7,5 @@
     android:minResizeHeight="110dp"
     android:resizeMode="horizontal|vertical"
     android:updatePeriodMillis="0"
+    android:previewImage="@drawable/ui_widget_preview"
     android:widgetCategory="home_screen" />