Show an app's latest notification under its name in the drawer list

PRD AD-11, the last buildable row of M4.

- FlexeraNotificationPreview keeps the text of the notifications that currently show a
  dot, fed by Launcher3's NotificationListener on its worker thread, and sets a second,
  smaller and dimmer line on a drawer row whenever the row's dot state is applied.
- It uses what the dots already use: the same notification access and the same filter
  for which notifications count. Without notification access nothing changes.
- PopupDataProvider now refreshes an app's icons on every posted notification, so a
  notification updated in place brings its new text to the row.
- Only rows of the drawer list take the second line (marked with a view tag); search
  result icons share the "all apps" display type but stay as they were.
- New setting under Settings > App drawer: Notification previews, on by default.

Checked on the Android 17 emulator (debug build): a test SMS showed under Messages,
a second one replaced it while the drawer was open, removing the notification put the
plain name back, and the setting switches the line off and on.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

flexera/res/values/flexera_ids.xml

@@ -2,4 +2,8 @@
 <resources>
     <!-- The wave alphabet view inside the drawer (app.flexera.drawer.WaveAlphabetView). -->
     <item name="flexera_wave_alphabet" type="id" />
+    <!-- View tag that marks an app row of the drawer list (FlexeraDrawer.styleAppRow). -->
+    <item name="flexera_drawer_row" type="id" />
+    <!-- View tag on a drawer row: set while the row shows a notification preview under the app name. -->
+    <item name="flexera_notification_preview" type="id" />
 </resources>

flexera/res/values/flexera_strings.xml

@@ -40,6 +40,8 @@
     <!-- Read by screen readers as the name of the alphabet strip, followed by the current letter -->
     <string name="flexera_alphabet_description">Alphabet</string>
     <!-- App drawer settings (app.flexera.ui.FlexeraDrawerSettings) -->
+    <string name="flexera_notification_previews">Notification previews</string>
+    <string name="flexera_notification_previews_description">Show an app\'s latest notification under its name in the app list. Works when notification dots are on (Settings, General).</string>
     <string name="flexera_alphabet_heading">Alphabet</string>
     <string name="flexera_alphabet_on_left">Alphabet on the left edge</string>
     <string name="flexera_alphabet_on_left_description">For left-handed use. The letters normally sit on the right edge.</string>

flexera/src/app/flexera/drawer/FlexeraDrawer.kt

@@ -87,6 +87,9 @@ object FlexeraDrawer {
     @JvmStatic
     fun styleAppRow(icon: BubbleTextView) {
         val res = icon.resources
+        // Other icons share the "all apps" display type (search results, for one); this tag
+        // tells list rows apart from them.
+        icon.setTag(R.id.flexera_drawer_row, true)
         icon.layoutParams.height = res.getDimensionPixelSize(R.dimen.flexera_drawer_row_height)
         icon.compoundDrawablePadding = res.getDimensionPixelSize(R.dimen.flexera_drawer_row_icon_gap)
         icon.setTextSize(TypedValue.COMPLEX_UNIT_PX, res.getDimension(R.dimen.flexera_drawer_row_text_size))

flexera/src/app/flexera/drawer/FlexeraNotificationPreview.kt

@@ -0,0 +1,132 @@
+package app.flexera.drawer
+
+import android.app.Notification
+import android.service.notification.StatusBarNotification
+import android.text.SpannableStringBuilder
+import android.text.Spanned
+import android.text.TextUtils
+import android.text.style.ForegroundColorSpan
+import android.text.style.RelativeSizeSpan
+import app.lawnchair.preferences.PreferenceManager
+import com.android.launcher3.BubbleTextView
+import com.android.launcher3.R
+import com.android.launcher3.dot.DotInfo
+import com.android.launcher3.model.data.ItemInfo
+import java.util.concurrent.ConcurrentHashMap
+
+/**
+ * Inline notification previews (PRD AD-11): in the drawer list, a row whose app has
+ * notifications shows the latest one under the app name, smaller and dimmer.
+ *
+ * It rides on what Launcher3 already has for notification dots. The same notification access
+ * feeds it, the same filter decides which notifications count, and a row is refreshed whenever
+ * its dot is. Without notification access there are no dots and no previews.
+ *
+ * Launcher3's listener hands each notification to [onPosted], [onRemoved] or [onFullRefresh] on
+ * its worker thread; the rows read the stored text on the main thread through [apply].
+ */
+object FlexeraNotificationPreview {
+
+    private class Preview(val text: String, val postTime: Long)
+
+    /** Latest text per notification key, for the notifications that currently show a dot. */
+    private val previews = ConcurrentHashMap<String, Preview>()
+
+    private const val MAX_LENGTH = 140
+
+    /** The preview line's text size as a share of the app name's. */
+    private const val TEXT_SCALE = 0.78f
+
+    /** White at 70%, so the app name stays the stronger of the two lines. */
+    private const val TEXT_COLOR = 0xB3FFFFFF.toInt()
+
+    @JvmStatic
+    fun onPosted(sbn: StatusBarNotification) {
+        val text = previewText(sbn)
+        if (text == null) previews.remove(sbn.key) else previews[sbn.key] = Preview(text, sbn.postTime)
+    }
+
+    @JvmStatic
+    fun onRemoved(sbn: StatusBarNotification) {
+        previews.remove(sbn.key)
+    }
+
+    @JvmStatic
+    fun onFullRefresh(active: List<StatusBarNotification>) {
+        previews.clear()
+        active.forEach(::onPosted)
+    }
+
+    /**
+     * Sets [icon]'s text for [info]: the app name, plus the latest notification under it when
+     * [dot] says the app has any. Called for drawer rows whenever their dot state is applied.
+     */
+    @JvmStatic
+    fun apply(icon: BubbleTextView, info: ItemInfo, dot: DotInfo?) {
+        // Only rows of the drawer list have room for a second line.
+        if (icon.getTag(R.id.flexera_drawer_row) == null) return
+        val name = info.title ?: return
+        val preview = if (dot != null && isEnabled(icon)) latest(dot) else null
+
+        if (preview == null) {
+            if (icon.getTag(R.id.flexera_notification_preview) != null) {
+                // The row was showing a preview, for this app earlier or for another app before
+                // the view was reused. Back to the plain one-line name.
+                icon.setTag(R.id.flexera_notification_preview, null)
+                icon.setLines(1)
+                icon.text = name
+            }
+            return
+        }
+
+        // The text is set afresh every time. Binding a row puts the plain name back first, so
+        // what the row showed before says nothing about what it shows now.
+
+        // Keep a long app name on its own line, so the preview is never pushed off the row.
+        val width = icon.width - icon.compoundPaddingLeft - icon.compoundPaddingRight
+        val firstLine = if (width > 0) {
+            TextUtils.ellipsize(name, icon.paint, width.toFloat(), TextUtils.TruncateAt.END)
+        } else {
+            name
+        }
+        val label = SpannableStringBuilder(firstLine).append('\n')
+        val start = label.length
+        label.append(preview)
+        label.setSpan(RelativeSizeSpan(TEXT_SCALE), start, label.length, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
+        label.setSpan(ForegroundColorSpan(TEXT_COLOR), start, label.length, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
+
+        icon.setLines(2)
+        icon.ellipsize = TextUtils.TruncateAt.END
+        icon.text = label
+        icon.setTag(R.id.flexera_notification_preview, true)
+    }
+
+    private fun isEnabled(icon: BubbleTextView): Boolean =
+        PreferenceManager.getInstance(icon.context).flexeraNotificationPreviews.get()
+
+    /** The text of the newest of the app's notifications that has any text. */
+    private fun latest(dot: DotInfo): String? {
+        var newest: Preview? = null
+        for (key in dot.notificationKeys) {
+            val candidate = previews[key.notificationKey] ?: continue
+            if (newest == null || candidate.postTime > newest.postTime) newest = candidate
+        }
+        return newest?.text
+    }
+
+    /** "Title: text" in one line, or whichever of the two the notification has. */
+    private fun previewText(sbn: StatusBarNotification): String? {
+        val extras = sbn.notification.extras ?: return null
+        val title = extras.getCharSequence(Notification.EXTRA_TITLE).oneLine()
+        val text = extras.getCharSequence(Notification.EXTRA_TEXT).oneLine()
+        val combined = when {
+            title.isEmpty() -> text
+            text.isEmpty() -> title
+            else -> "$title: $text"
+        }
+        return combined.take(MAX_LENGTH).ifEmpty { null }
+    }
+
+    private fun CharSequence?.oneLine(): String =
+        this?.toString()?.replace('\n', ' ')?.trim().orEmpty()
+}

flexera/src/app/flexera/ui/FlexeraDrawerSettings.kt

@@ -49,6 +49,11 @@ fun FlexeraDrawerSettings(modifier: Modifier = Modifier) {
                 label = stringResource(id = R.string.suggestion_pref_screen_title),
                 destination = Predictions,
             )
+            SwitchPreference(
+                label = stringResource(id = R.string.flexera_notification_previews),
+                description = stringResource(id = R.string.flexera_notification_previews_description),
+                adapter = prefs.flexeraNotificationPreviews.getAdapter(),
+            )
             SwitchPreference(
                 label = stringResource(id = R.string.pref_all_apps_remember_position_title),
                 description = stringResource(id = R.string.pref_all_apps_remember_position_description),

lawnchair/src/app/lawnchair/preferences/PreferenceManager.kt

@@ -220,6 +220,9 @@ class PreferenceManager @Inject constructor(
     // Flexera Launcher: whether a slide along the home screen's edge opens the drawer at a letter (PRD AD-10).
     val flexeraScrubFromHome = BoolPref("pref_flexeraScrubFromHome", false)
 
+    // Flexera Launcher: whether drawer rows show the app's latest notification under its name (PRD AD-11).
+    val flexeraNotificationPreviews = BoolPref("pref_flexeraNotificationPreviews", true, recreate)
+
     override fun close() {
         TODO("Not yet implemented")
     }

src/com/android/launcher3/BubbleTextView.java

@@ -1413,6 +1413,11 @@ public class BubbleTextView extends TextView implements ItemInfoUpdateReceiver,
                     setContentDescription(itemInfo.contentDescription);
                 }
             }
+            // Flexera Launcher: a row in the drawer list shows its app's latest notification
+            // under the app name (PRD AD-11).
+            if (mDisplay == DISPLAY_ALL_APPS) {
+                app.flexera.drawer.FlexeraNotificationPreview.apply(this, itemInfo, mDotInfo);
+            }
         }
     }
 

src/com/android/launcher3/notification/NotificationListener.java

@@ -129,13 +129,23 @@ public class NotificationListener extends NotificationListenerService {
         switch (message.what) {
             case MSG_NOTIFICATION_POSTED: {
                 StatusBarNotification sbn = (StatusBarNotification) message.obj;
-                mUiHandler.obtainMessage(notificationIsValidForUI(sbn)
+                // Flexera Launcher: keep the text for the drawer's notification previews in step
+                // with the dots, before the rows are told to refresh (PRD AD-11).
+                boolean validForUi = notificationIsValidForUI(sbn);
+                if (validForUi) {
+                    app.flexera.drawer.FlexeraNotificationPreview.onPosted(sbn);
+                } else {
+                    app.flexera.drawer.FlexeraNotificationPreview.onRemoved(sbn);
+                }
+                mUiHandler.obtainMessage(validForUi
                                 ? MSG_NOTIFICATION_POSTED : MSG_NOTIFICATION_REMOVED,
                         toKeyPair(sbn)).sendToTarget();
                 return true;
             }
             case MSG_NOTIFICATION_REMOVED: {
                 StatusBarNotification sbn = (StatusBarNotification) message.obj;
+                // Flexera Launcher: drop the notification's preview text with its dot.
+                app.flexera.drawer.FlexeraNotificationPreview.onRemoved(sbn);
                 mUiHandler.obtainMessage(MSG_NOTIFICATION_REMOVED,
                         toKeyPair(sbn)).sendToTarget();
 
@@ -158,6 +168,8 @@ public class NotificationListener extends NotificationListenerService {
                 } else {
                     activeNotifications = new ArrayList<>();
                 }
+                // Flexera Launcher: rebuild the preview texts from the same list as the dots.
+                app.flexera.drawer.FlexeraNotificationPreview.onFullRefresh(activeNotifications);
 
                 mUiHandler.obtainMessage(message.what, activeNotifications).sendToTarget();
                 return true;

src/com/android/launcher3/popup/PopupDataProvider.java

@@ -102,9 +102,11 @@ public class PopupDataProvider implements NotificationListener.NotificationsChan
             dotInfo = new DotInfo();
             mPackageUserToDotInfos.put(postedPackageUserKey, dotInfo);
         }
-        if (dotInfo.addOrUpdateNotificationKey(notificationKey)) {
-            updateNotificationDots(postedPackageUserKey::equals);
-        }
+        // Flexera Launcher: refresh the app's icons on every posted notification, not only when
+        // the dot or its count changes. A notification that is updated in place keeps its dot
+        // but brings new text for the drawer's preview line (PRD AD-11).
+        dotInfo.addOrUpdateNotificationKey(notificationKey);
+        updateNotificationDots(postedPackageUserKey::equals);
     }
 
     @Override