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How to use Android TEXT TO SPEAK from Singleton?
Before getting into example, we should know what singleton design pattern is. A singleton is a design pattern that restricts the instantiation of a class to only one instance. Notable uses include controlling concurrency, and creating a central point of access for an application to access its data store.
This example demonstrates How to use Android TEXT TO SPEAK from Singleton
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".MainActivity" android:orientation = "vertical"> <EditText android:id = "@+id/editText" android:hint = "Write here what to speak " android:layout_width = "match_parent" android:layout_height = "wrap_content" /> <Button android:id = "@+id/show" android:text = "TTS from singleTone" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> </LinearLayout>
In the above code, we have taken a button and editext. When user click on show button, it will take data from edittext and play sound from singleton.
Step 3 − Add the following code to src/MainActivity.java
package com.example.andy.myapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
Button show;
singleTonExample singletonexample;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
show = findViewById(R.id.show);
singletonexample = singleTonExample.getInstance();
singletonexample.init(getApplicationContext());
final EditText editText = findViewById(R.id.editText);
show.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!editText.getText().toString().isEmpty()) {
singletonexample.textToSpeach(editText.getText().toString());
}
}
});
}
}In the above code, we have used singleTonExample as singleton calss so create a call as singleTonExample.java and add the following code-
package com.example.andy.myapplication;
import android.content.Context;
import android.media.MediaPlayer;
import android.speech.tts.TextToSpeech;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.Locale;
import java.util.Timer;
import java.util.TimerTask;
public class singleTonExample {
static TextToSpeech t1;
private static singleTonExample ourInstance = new singleTonExample();
private Context appContext;
private singleTonExample() { }
public static Context get() {
return getInstance().getContext();
}
public static synchronized singleTonExample getInstance() {
return ourInstance;
}
public void init(Context context) {
if (appContext = = null) {
this.appContext = context;
}
}
private Context getContext() {
return appContext;
}
public void textToSpeach(String Speak) {
t1 = new TextToSpeech(get(), new TextToSpeech.OnInitListener() {
@Override
public void onInit(int status) {
if(status ! = TextToSpeech.ERROR) {
t1.setLanguage(Locale.UK);
}
}
});
t1.speak(Speak, TextToSpeech.QUEUE_FLUSH, null);
}
}Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –
Now click on above button, it will play sound from singleton class.
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