I've made a little test program that should answer this question for you.
It shows you a list of all the voices the Google engine has in it, and you click on them and listen to them! Yay!
What it actually does:
- Initializes a TextToSpeech object using the Google text-to-speech engine if it exists on the device.
- Lets you choose a specific Voice from a ListView which contains ALL potentially available voices corresponding to the Locale specified in code (in this case, English)... and corresponding to the version of the Google text-to-speech engine you have installed.
This way, you can test all the voices to see if the "Google Assistant" voice you seek is somewhere in there, and if it's not available, you can keep checking as new versions of the Google text-to-speech engine are released. It seems to me that the highest quality voices in this test are both quality:400, and specify that a network connection is required.
NOTES:
A voice (especially English) will most likely still "play" even if it is "not installed." This is because when using setVoice(Voice v), the (Google) engine will return a "success" int even if the requested voice is not available(!), as long as it has some other "back-up" voice on hand of the same language. Unfortunately it does all this in the background and still sneakily reports that it's using the same exact voice you requested even if you use getVoice() and compare objects. :(.
Generally if a voice says it IS installed, then the voice you are hearing is the voice you requested.
For these reasons, you'll want to make sure you're on the internet when you test these voices (so that they auto-install when you request unavailable voices)... and also so that Voices that require a network connection will not "auto-downgrade."
You can swipe/refresh the listview of voices in order to check whether voices have been installed yet, or use the system's pull-down menu to watch for downloads... or go into Google's text-to-speech settings in the device system settings.
In the list view, the Voice features such as "network required," and "installed," are simply echoes of what the Google engine reports and may not be accurate. :(
The maximum possible voice quality specified in the Voice class documentation is 500. In my tests I could only find voices up to quality 400. This may be because I do not have the latest version of Google text-to-speech installed on my test device (and I don't have Play Store access on it in order to update it). If you're using a real device, I suggest installing the latest version of Google TTS using the Google Play Store. You can verify engine version in the Logs. According to Wikipedia, the latest version as of this writing is 3.15.18.200023596. The version on my test device is 3.13.1.
To re-create this test app, make a blank Java project in Android Studio with a minimum API of 21. (getVoices() does not work pre-21).
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package=" [ your.package.name ] "
android:windowSoftInputMode="stateHidden">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity:
package [ your package name ];
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Color;
import android.speech.tts.TextToSpeech;
import android.speech.tts.UtteranceProgressListener;
import android.speech.tts.Voice;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
EditText textToSpeak;
TextView progressView;
TextToSpeech googleTTS;
ListView voiceListView;
SwipeRefreshLayout swipeRefreshLayout;
Long timeOfSpeakRequest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textToSpeak = findViewById(R.id.textToSpeak);
textToSpeak.setText("Do I sound robotic to you? 1,2,3,4... yabadabadoo. "
+ "ooo! ahh! la-la-la-la-la! num-num-dibby-dibby-num-tick-tock... "
+ "Can I pronounce the word, Antidisestablishmentarianism? "
+ "Gerp! My pants are too tight! "
+ "CODE RED! CODE RED! Initiate disassemble! Ice Cream is cold "
+ "...in my pants. Exterminate! exterminate! Directive 4 is "
+ "classified."
);
progressView = findViewById(R.id.progressView);
voiceListView = findViewById(R.id.voiceListView);
swipeRefreshLayout = findViewById(R.id.swipeRefresh);
// Create the TTS and wait until it's initialized to do anything else
if (isGoogleEngineInstalled()) {
createGoogleTTS();
} else {
Log.i("XXX", "onCreate(): Google not installed -- nothing done.");
}
}
@Override
protected void onStart() {
super.onStart();
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
assignFullSetOfVoicesToVoiceListView();
}
});
}
// this is where the program really begins (when the TTS is initialized)
private void onTTSInitialized() {
setUpWhatHappensWhenAVoiceItemIsClicked();
setUtteranceProgressListenerOnTheTTS();
assignFullSetOfVoicesToVoiceListView();
}
// FACTORED/EXTRACTED METHODS ----------------------------------------------------------------
// These are just pulled out to make onCreate() easier to read and the basic sequence
// of events more obvious.
private void createGoogleTTS() {
googleTTS = new TextToSpeech(this, new TextToSpeech.OnInitListener() {
@Override
public void onInit(int status) {
if (status != TextToSpeech.ERROR) {
Log.i("XXX", "Google tts initialized");
onTTSInitialized();
} else {
Log.i("XXX", "Internal Google engine init error.");
}
}
}, "com.google.android.tts");
}
private void setUpWhatHappensWhenAVoiceItemIsClicked() {
voiceListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Voice desiredVoice = (Voice) parent.getAdapter().getItem(position);
// if (setting the desired voice is "successful")...
// in the case of google engine, this does not necessarily mean the voice you
// want will actually be used. :(
if (googleTTS.setVoice(desiredVoice) == 0) {
Log.i("XXX", "Speech voice set to: " + desiredVoice.toString());
// TTS did may "auto-downgrade" voice selection
// due to internal reason such as no data
// Unfortunately it will not tell you, and there seems to be no
// way of checking whether the presently selected voice (getVoice()) "equals"
// the desired voice.
speak();
}
}
});
}
private void setUtteranceProgressListenerOnTheTTS() {
UtteranceProgressListener blurp = new UtteranceProgressListener() {
@Override // MIN API 15
public void onStart(String s) {
long timeSinceSpeakCall = System.currentTimeMillis() - timeOfSpeakRequest;
Log.i("XXX", "progress.onStart() callback. "
+ timeSinceSpeakCall + " millis since speak() was called.");
runOnUiThread(new Runnable() {
@Override
public void run() {
progressView.setTextColor(Color.GREEN);
progressView.setText("PROGRESS: STARTED");
}
});
}
@Override // MIN API 15
public void onDone(String s) {
long timeSinceSpeakCall = System.currentTimeMillis() - timeOfSpeakRequest;
Log.i("XXX", "progress.onDone() callback. "
+ timeSinceSpeakCall + " millis since speak() was called.");
runOnUiThread(new Runnable() {
@Override
public void run() {
progressView.setTextColor(Color.GREEN);
progressView.setText("PROGRESS: DONE");
}
});
}
// Getting an error can simply mean that the particular voice is not available
// to the device yet... and still needs to be downloaded / is still downloading
@Override // MIN API 15 (depracated at API 21)
public void onError(String s) {
long timeSinceSpeakCall = System.currentTimeMillis() - timeOfSpeakRequest;
Log.i("XXX", "progress.onERROR() callback. "
+ timeSinceSpeakCall + " millis since speak() was called.");
runOnUiThread(new Runnable() {
@Override
public void run() {
progressView.setTextColor(Color.RED);
progressView.setText("PROGRESS: ERROR");
}
});
}
};
googleTTS.setOnUtteranceProgressListener(blurp);
}
// must happens AFTER tts is initialized
private void assignFullSetOfVoicesToVoiceListView() {
googleTTS.stop();
List<Voice> tempVoiceList = new ArrayList<>();
for (Voice v : googleTTS.getVoices()) {
if (v.getLocale().getLanguage().contains("en")) { // only English voices
tempVoiceList.add(v);
}
}
// Sort the list alphabetically by name
Collections.sort(tempVoiceList, new Comparator<Voice>() {
@Override
public int compare(Voice v1, Voice v2) {
Log.i("XXX", "comparing item");
return (v2.getName().compareToIgnoreCase(v1.getName()));
}
});
VoiceAdapter tempAdapter = new VoiceAdapter(this, tempVoiceList);
voiceListView.setAdapter(tempAdapter);
swipeRefreshLayout.setRefreshing(false);
progressView.setTextColor(Color.BLACK);
progressView.setText("PROGRESS: ...");
}
private void speak() {
HashMap<String, String> map = new HashMap<>();
map.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, "merp");
timeOfSpeakRequest = System.currentTimeMillis();
googleTTS.speak(textToSpeak.getText().toString(), TextToSpeech.QUEUE_FLUSH, map);
}
// Checks if Google Engine is installed
// ... (and gives more info in Logs).
// The version number is going to dictate the quality of voices available
private boolean isGoogleEngineInstalled() {
final Intent ttsIntent = new Intent();
ttsIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
final PackageManager pm = getPackageManager();
final List<ResolveInfo> list = pm.queryIntentActivities(ttsIntent, PackageManager.GET_META_DATA);
boolean googleIsInstalled = false;
for (int i = 0; i < list.size(); i++) {
ResolveInfo resolveInfoUnderScrutiny = list.get(i);
String engineName = resolveInfoUnderScrutiny.activityInfo.applicationInfo.packageName;
if (engineName.equals("com.google.android.tts")) {
String version = "null";
try {
version = pm.getPackageInfo(engineName,
PackageManager.GET_META_DATA).versionName;
} catch (Exception e) {
Log.i("XXX", "Error getting google engine verion: " + e.toString());
}
Log.i("XXX", "Google engine version " + version + " is installed!");
googleIsInstalled = true;
} else {
Log.i("XXX", "Google Engine is not installed!");
}
}
return googleIsInstalled;
}
}
VoiceAdapter.java:
package [ your package name ];
import android.content.Context;
import android.graphics.Color;
import android.speech.tts.Voice;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
public class VoiceAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater mInflater;
private List<Voice> mDataSource;
public VoiceAdapter(Context context, List<Voice> voicesToDisplay) {
mContext = context;
mDataSource = voicesToDisplay;
mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mDataSource.size();
}
@Override
public Object getItem(int position) {
return mDataSource.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// In a real app this method is not efficient,
// and "View Holder Pattern" shoudl be used instead.
View rowView = mInflater.inflate(R.layout.list_item_voice, parent, false);
if (position%2 == 0) {
rowView.setBackgroundColor(Color.rgb(245,245,245));
}
Voice voiceUnderScrutiny = mDataSource.get(position);
// example output of Voice.toString() :
// "Voice[Name: pt-br-x-afs#male_2-local, locale: pt_BR, quality: 400, latency: 200,
// requiresNetwork: false, features: [networkTimeoutMs, notInstalled, networkRetriesCount]]"
// Get title element
TextView voiceTitleTextView =
(TextView) rowView.findViewById(R.id.voice_title);
TextView qualityTextView =
(TextView) rowView.findViewById(R.id.voice_quality);
TextView networkRequiredTextView =
(TextView) rowView.findViewById(R.id.voice_network);
TextView isInstalledTextView =
(TextView) rowView.findViewById(R.id.voice_installed);
TextView featuresTextView =
(TextView) rowView.findViewById(R.id.voice_features);
voiceTitleTextView.setText("VOICE NAME: " + voiceUnderScrutiny.getName());
// Voice Quality...
// ( https://developer.android.com/reference/android/speech/tts/Voice.html )
// 100 = Very Low, 200 = Low, 300 = Normal, 400 = High, 500 = Very High
qualityTextView.setText( "QLTY: " + ((Integer) voiceUnderScrutiny.getQuality()).toString() );
if (voiceUnderScrutiny.getQuality() == 500) {
qualityTextView.setTextColor(Color.GREEN); // set v. high quality to green
}
if (!voiceUnderScrutiny.isNetworkConnectionRequired()) {
networkRequiredTextView.setText("NET_REQ?: NO");
} else {
networkRequiredTextView.setText("NET_REQ?: YES");
}
if (!voiceUnderScrutiny.getFeatures().contains("notInstalled")) {
isInstalledTextView.setTextColor(Color.GREEN);
isInstalledTextView.setText("INSTLLD?: YES");
} else {
isInstalledTextView.setTextColor(Color.RED);
isInstalledTextView.setText("INSTLLD?: NO");
}
featuresTextView.setText("FEATURES: " + voiceUnderScrutiny.getFeatures().toString());
return rowView;
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
android:focusableInTouchMode="true"
tools:context=".MainActivity">
<EditText
android:id="@+id/textToSpeak"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:ems="10"
android:inputType="textPersonName"
android:text="textToSpeak..."
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefresh"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/progressView">
<ListView
android:id="@+id/voiceListView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp">
</ListView>
</android.support.v4.widget.SwipeRefreshLayout>
<TextView
android:id="@+id/progressView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="UTTERANCE_PROGRESS:"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textToSpeak" />
</android.support.constraint.ConstraintLayout>
list_item_voice.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:paddingBottom="8dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="8dp"
>
<TextView
android:id="@+id/voice_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="NAME:"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/voice_installed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:fontFamily="monospace"
android:text="INSTALLED? "
android:textAlignment="textStart"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/voice_network"
app:layout_constraintTop_toBottomOf="@+id/voice_title" />
<TextView
android:id="@+id/voice_quality"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="QUALITY:"
app:layout_constraintEnd_toStartOf="@+id/voice_network"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/voice_title" />
<TextView
android:id="@+id/voice_features"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="FEATURES:"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/voice_quality" />
<TextView
android:id="@+id/voice_network"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="NET_REQUIRED?"
app:layout_constraintEnd_toStartOf="@+id/voice_installed"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/voice_quality"
app:layout_constraintTop_toBottomOf="@+id/voice_title" />
</android.support.constraint.ConstraintLayout>
