Limits of Noise‑Free Alerts in Appcelerator Titanium on Android 8.0+

Question

The goal is to configure Appcelerator Titanium applications to present alerts that are visible to the user but do not generate any audible sound, vibration, or badge notification on Android devices, while still allowing the alert to be dismissed or acted upon.
This approach relies on Ti.Android.createNotificationChannel with importance set to MIN (or LOW) and sound disabled, but its effectiveness can vary across Android OEM implementations and on devices running Android versions below 8.0 where the channel API is unavailable. Additionally, the modal Ti.UI.createAlertDialog blocks the UI, which may be undesirable for background processes.

Does setting channel importance to Ti.Android.IMPORTANCE_MIN and sound:false guarantee suppression of audio, vibration, and badge on all Android 8.0+ devices, including manufacturer‑specific skins?
On devices running Android <8.0 where Ti.Android.createNotificationChannel is not available, can a combination of Ti.UI.createAlertDialog and disabling system notification sounds via Ti.Android.NotificationManager be relied upon to achieve noise‑free alerts?
Are there any known side‑effects, such as delayed delivery or heads‑up suppression, when using MIN importance with sound disabled that might affect user perception of the alert?

Tasadduq Burney · Answer

Answer to the Core Questions
1. Does IMPORTANCE_MIN + sound:false guarantee silence on all Android 8.0+ devices?

On stock Android 8.0+ the combination of IMPORTANCE_MIN and a sound value of null (or false) indeed suppresses audible alerts, vibration, and heads‑up banners.
OEM skins (Samsung, Xiaomi, Huawei, etc.) may override these settings. In practice, Samsung often shows a badge counter even when sound is disabled, and some Xiaomi ROMs can trigger vibration if the channel’s vibrationPattern isn’t explicitly set to an empty array.
Therefore, the guarantee is limited to devices that respect the Android notification framework without aggressive customizations.

2. Can Ti.UI.createAlertDialog + Ti.Android.NotificationManager be used on Android <8.0 for silent alerts?

No. Ti.UI.createAlertDialog always plays the system default alert sound on pre‑Oreo devices. Changing the global notification sound via NotificationManager does not affect the dialog.
For Android 7.1 and below, the only reliable silent‑alert path is to build a custom modal view (e.g., Ti.UI.createView with a semi‑transparent background) and display it manually.

3. Side‑effects of MIN importance with sound disabled?

Heads‑up notifications are suppressed – the user sees the notification only after pulling down the shade.
Doze mode or aggressive battery optimizations can delay delivery regardless of importance.
Badge counters may still appear if the app does not clear badgeNumber explicitly.

Confirmed Practices for Android 8.0+

var channel = Ti.Android.createNotificationChannel({
  id: 'silent',
  name: 'Silent Alerts',
  importance: Ti.Android.IMPORTANCE_MIN,
  sound: null,
  vibrationPattern: [],
  lockscreenVisibility: Ti.Android.VISIBILITY_PRIVATE
});
Store channel.id once during app startup and reuse it for every notification.
When sending the notification, set channelId: 'silent' and keep sound: null and vibrate: false.
Explicitly clear badge counters with Ti.Android.NotificationManager.clearBadge(); if the OEM shows them.
Test on a stock Android 8.0+ device and on at least one OEM device you target to confirm silence.

Work‑around for Android < 8.0

Replace Ti.UI.createAlertDialog with a custom Ti.UI.createView modal.
Show the modal from the background process using Ti.UI.currentWindow.add(customView); customView.show();.
Ensure the modal’s background is semi‑transparent so the user can still see underlying UI if desired.

Missing Diagnostic Detail
To fine‑tune the solution for your target audience, could you share which OEM skins (e.g., Samsung One UI, Xiaomi MIUI) you plan to support? This will help determine if additional badge‑clearing or vibration overrides are necessary.

Limits of Noise‑Free Alerts in Appcelerator Titanium on Android 8.0+

1 answer

Answer to the Core Questions

Confirmed Practices for Android 8.0+

Work‑around for Android < 8.0

Missing Diagnostic Detail

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