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fix: native Android TTS bridge in kiosk — bypass Web Speech API voice issues

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On Android WebView, window.speechSynthesis.getVoices() often returns empty
because the Web Speech API cannot enumerate the device's TTS voices.
This caused the kiosk to show 'nessuna voce offline è supportata'.

Changes:
- KioskActivity.kt: initialise Android TextToSpeech engine on startup;
  expose speak(text, rate, pitch), stopSpeech() and isTtsReady() via
  the existing _kioskBridge JavascriptInterface; release TTS in onDestroy.
- app.js (_speakBrowser): when _kioskBridge.speak is available, delegate
  to it instead of using speechSynthesis — works even without offline voice
  packs installed.
- app.js (_initBrowserTtsVoices): show 'Voce nativa Android (kiosk)'
  in the voice dropdown when running inside the kiosk WebView.
- app.js (testTTS): use the bridge path when testing TTS inside the kiosk.
This commit is contained in:
dadaloop82
2026-04-27 11:52:30 +00:00
parent 8b5985dc80
commit 95389ebe87
2 changed files with 86 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
assets/js/app.js
+34 -5
View File
@@ -9368,6 +9368,13 @@ function _initBrowserTtsVoices(selectedVoice) {
const sel = document.getElementById('setting-tts-voice');
if (!sel) return;
// Inside the EverShelf Kiosk Android app the native TTS bridge handles
// speech — no Web Speech API voice list needed.
if (typeof _kioskBridge !== 'undefined' && typeof _kioskBridge.speak === 'function') {
sel.innerHTML = '<option value="">— Voce nativa Android (kiosk) —</option>';
return;
}
if (!window.speechSynthesis) {
sel.innerHTML = '<option value="">— Voce non supportata dal browser —</option>';
return;
@@ -9417,19 +9424,31 @@ function _initBrowserTtsVoices(selectedVoice) {
}, 200);
}
/** Speak text using the browser Web Speech API (offline). */
/** Speak text using the browser Web Speech API (offline).
* When running inside the EverShelf Kiosk Android app the native TTS bridge
* is preferred — it bypasses Web Speech API voice limitations on Android. */
function _speakBrowser(text) {
const s = getSettings();
const rate = parseFloat(s.tts_rate) || 1;
const pitch = parseFloat(s.tts_pitch) || 1;
// ── Native Android TTS bridge (kiosk WebView) ──────────────────────
if (typeof _kioskBridge !== 'undefined' && typeof _kioskBridge.speak === 'function') {
try { _kioskBridge.speak(text, rate, pitch); } catch(_e) { /* silent */ }
return;
}
// ── Web Speech API (desktop / mobile browser) ──────────────────────
if (!window.speechSynthesis) return;
window.speechSynthesis.cancel();
const s = getSettings();
const utt = new SpeechSynthesisUtterance(text);
utt.rate = parseFloat(s.tts_rate) || 1;
utt.pitch = parseFloat(s.tts_pitch) || 1;
utt.rate = rate;
utt.pitch = pitch;
const voices = window.speechSynthesis.getVoices();
const preferred = voices.find(v => v.name === s.tts_voice);
if (preferred) {
utt.voice = preferred;
utt.lang = preferred.lang;
utt.lang = preferred.lang;
} else {
utt.lang = _currentLang === 'de' ? 'de-DE' : _currentLang === 'en' ? 'en-US' : 'it-IT';
}
@@ -9445,6 +9464,16 @@ async function testTTS() {
}
const engine = document.getElementById('setting-tts-engine')?.value || 'browser';
if (engine === 'browser') {
// Kiosk native TTS bridge takes priority over Web Speech API
if (typeof _kioskBridge !== 'undefined' && typeof _kioskBridge.speak === 'function') {
const s = getSettings();
s.tts_rate = parseFloat(document.getElementById('setting-tts-rate')?.value) || 1;
s.tts_pitch = parseFloat(document.getElementById('setting-tts-pitch')?.value) || 1;
saveSettingsToStorage(s);
_speakBrowser('Test vocale EverShelf. La sintesi vocale funziona correttamente.');
if (statusEl) { statusEl.style.display = 'block'; statusEl.className = 'settings-status success'; statusEl.textContent = '✅ Riproduzione in corso — controlla l\'audio del dispositivo.'; }
return;
}
if (!window.speechSynthesis) {
if (statusEl) { statusEl.style.display = 'block'; statusEl.className = 'settings-status error'; statusEl.textContent = '❌ Web Speech API non supportata da questo browser.'; }
return;