Text zu Sprache in Android

Die Überblick
Zum Beispiel Text To Speech
Anhang: Interface Design

1. Die Überblick

Die Umsetzung einer Text zu einer Aussage ist eine Funktion, die im Android ab API 21 eingeführt, damit Sie einen Text zu einer Aussage umsetzen dürfen. Die Funktion unterstützt viele unterschiedlichen Sprache. Um diese Funktion durchzuführen sollen Sie die Klasse android.speech.tts.TextToSpeech.benutzen

Bis zum Android API Level 23 werden die folgenden locale unterstützt

en_US
de_DE
fr
es_ES
de
en
it_IT
it
en_GB
es
fr_FR

2. Zum Beispiel Text To Speech

Erstellen Sie ein Projekt mit dem Name von TextToSpeechDemo:

Wenn Sie sich für die Design-Schritte der Anwendungsinterface interessieren, sehen Sie bitte den Anhang am Ende des Artikel.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/ConstraintLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="0dp"
        android:layout_height="160dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="14dp"
        android:layout_marginRight="14dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <RadioButton
            android:id="@+id/radio_en"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="English" />

        <RadioButton
            android:id="@+id/radio_fr"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="France" />
    </RadioGroup>

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="49dp"
        android:layout_marginStart="18dp"
        android:layout_marginLeft="18dp"
        android:layout_marginTop="80dp"
        android:layout_marginEnd="17dp"
        android:layout_marginRight="17dp"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="88dp"
        android:text="Speak"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

</androidx.constraintlayout.widget.ConstraintLayout>

Min SDK Level

Text To Speech fordert Android API Level >= 21 deshalb sollen Sie in die File build.gradle (Module:app).konfigurieren

minSdkVersion 21

MainActivity.java

package org.o7planning.texttospeechdemo;

import android.app.Activity;
import android.os.Bundle;

import android.speech.tts.TextToSpeech;

import android.util.Log;
import android.view.View;

import android.widget.Button;
import android.widget.EditText;

import java.util.Locale;
import java.util.Set;
import java.util.UUID;

import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends Activity {
    private TextToSpeech textToSpeech;
    private EditText editText;
    private Button button;
    private RadioButton radio_en;
    private RadioButton radio_fr;
    RadioGroup radioGroup;

    private boolean ready;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText) findViewById(R.id.editText);
        button = (Button) findViewById(R.id.button);
        radio_en = (RadioButton) findViewById(R.id.radio_en);
        radio_fr = (RadioButton) findViewById(R.id.radio_fr);
        radioGroup = (RadioGroup) findViewById(R.id.radioGroup);


        textToSpeech = new TextToSpeech(getApplicationContext(), new TextToSpeech.OnInitListener() {
            @Override
            public void onInit(int status) {
                Log.e("TTS", "TextToSpeech.OnInitListener.onInit...");
                printOutSupportedLanguages();
                setTextToSpeechLanguage();
            }
        });
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                setTextToSpeechLanguage();
            }
        });
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                speakOut();
            }
        });
    }

    private void printOutSupportedLanguages()  {
        // Supported Languages
        Set<Locale> supportedLanguages = textToSpeech.getAvailableLanguages();
        if(supportedLanguages!= null) {
            for (Locale lang : supportedLanguages) {
                Log.e("TTS", "Supported Language: " + lang);
            }
        }
    }


    @Override
    public void onPause() {
        if (textToSpeech != null) {
            textToSpeech.stop();
            textToSpeech.shutdown();
        }
        super.onPause();
    }

    private void speakOut() {
        if (!ready) {
            Toast.makeText(this, "Text to Speech not ready", Toast.LENGTH_LONG).show();
            return;
        }
        // Text to Speak
        String toSpeak = editText.getText().toString();
        Toast.makeText(this, toSpeak, Toast.LENGTH_SHORT).show();
        // A random String (Unique ID).
        String utteranceId = UUID.randomUUID().toString();
        textToSpeech.speak(toSpeak, TextToSpeech.QUEUE_FLUSH, null, utteranceId);
    }

    private Locale getUserSelectedLanguage() {
        int checkedRadioId = this.radioGroup.getCheckedRadioButtonId();
        if (checkedRadioId == R.id.radio_en) {
            return Locale.ENGLISH;
        } else if (checkedRadioId == R.id.radio_fr) {
            return Locale.FRANCE;
        }
        return null;
    }


    private void setTextToSpeechLanguage() {
        Locale language = this.getUserSelectedLanguage();
        if (language == null) {
            this.ready = false;
            Toast.makeText(this, "Not language selected", Toast.LENGTH_SHORT).show();
            return;
        }
        int result = textToSpeech.setLanguage(language);
        if (result == TextToSpeech.LANG_MISSING_DATA) {
            this.ready = false;
            Toast.makeText(this, "Missing language data", Toast.LENGTH_SHORT).show();
            return;
        } else if (result == TextToSpeech.LANG_NOT_SUPPORTED) {
            this.ready = false;
            Toast.makeText(this, "Language not supported", Toast.LENGTH_SHORT).show();
            return;
        } else {
            this.ready = true;
            Locale currentLanguage = textToSpeech.getVoice().getLocale();
            Toast.makeText(this, "Language " + currentLanguage, Toast.LENGTH_SHORT).show();
        }
    }


}

Die Applikation durchführen