Cocoa練習帳

文章読み上げの機能を利用するためには、AndroidManifest.xmlでの宣言が必要です。

<manifest>
    <application>
    </application>
 
    <queries>
        <intent>
            <action android:name="android.intent.action.TTS_SERVICE" />
        </intent>
    </queries>
</manifest>

Jetpack Compose的なグローバルな変数を保持する方法はあると思いますが、TextToSpeechインスタンスはsetContentの外のメンバーとして保持しています。

class MainActivity : ComponentActivity(), TextToSpeech.OnInitListener {
    private var textToSpeech: TextToSpeech? = null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        this.textToSpeech = TextToSpeech(this, this)
        setContent {
            TextToSpeechTheme {
                Surface(modifier = Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background) {
                    Greeting(this.textToSpeech)
                }
            }
        }
    }

onInit()で初期化を

   override fun onInit(status: Int) {
        if (status == TextToSpeech.SUCCESS) {
            val locale = Locale.JAPAN
            if (this.textToSpeech!!.isLanguageAvailable(locale) >= TextToSpeech.LANG_AVAILABLE) {
                this.textToSpeech!!.language = Locale.JAPAN
            }
            // this.tts!!.speak("こんにちは", TextToSpeech.QUEUE_FLUSH, null, "utteranceId")
        }
    }
}

入力フィールドとボタンのコンテンツ。

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun Greeting(textToSpeech: TextToSpeech?, modifier: Modifier = Modifier) {
    val textValue = rememberSaveable { mutableStateOf("文字列を入力してください。") }
    Column {
        TextField(
            value = textValue.value,
            onValueChange = { textValue.value = it },
            label = { },
            modifier = Modifier.padding(16.dp)
        )
        Spacer(modifier = Modifier.width(8.dp))
        Button(
            onClick = {
                if (textToSpeech != null) {
                    textToSpeech!!.speak(
                        textValue.value,
                        TextToSpeech.QUEUE_FLUSH,
                        null,
                        "utteranceId"
                    )
                }
            }
        ) {
            Text("Say")
        }
    }
}

rememberSaveableで文章を永続的に保持し、入力フィールドの値をtextToSpeechに渡している。

@Preview(showBackground = true)
@Composable
fun GreetingPreview() {
    TextToSpeechTheme {
        Greeting(null)
    }
}

以下のデバッグ出力を仕込んで、利用できるヴォイスをダンプしてみた。

this.textToSpeech!!.voices.forEach { voice -> Log.d("MainActivity", voice.toString()) }

量が多いので日本語関連のみ抜き出してみる。

Voice[Name: ja-jp-x-jab-network, locale: ja_JP, quality: 400, latency: 200, requiresNetwork: true, features: [networkTimeoutMs, networkRetriesCount]]
Voice[Name: ja-jp-x-htm-network, locale: ja_JP, quality: 400, latency: 200, requiresNetwork: true, features: [networkTimeoutMs, networkRetriesCount]]
Voice[Name: ja-jp-x-jad-network, locale: ja_JP, quality: 400, latency: 200, requiresNetwork: true, features: [networkTimeoutMs, networkRetriesCount]]
Voice[Name: ja-jp-x-jab-local, locale: ja_JP, quality: 400, latency: 200, requiresNetwork: false, features: [networkTimeoutMs, networkRetriesCount]]
Voice[Name: ja-jp-x-jad-local, locale: ja_JP, quality: 400, latency: 200, requiresNetwork: false, features: [networkTimeoutMs, networkRetriesCount]]
Voice[Name: ja-jp-x-jac-local, locale: ja_JP, quality: 400, latency: 200, requiresNetwork: false, features: [networkTimeoutMs, networkRetriesCount]]
Voice[Name: ja-jp-x-jac-network, locale: ja_JP, quality: 400, latency: 200, requiresNetwork: true, features: [networkTimeoutMs, networkRetriesCount]]
Voice[Name: ja-jp-x-htm-local, locale: ja_JP, quality: 400, latency: 200, requiresNetwork: false, features: [networkTimeoutMs, networkRetriesCount]]

Appleと異なり、声色毎という方向での充実ではなさそうですね。

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