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Speech to Text - Android Tutorial

This tutorial explains how to use an android inbuilt feature 'speech to text' through which you can provide speech input to your app.

How voice input works?

The speech input will be streamed to a server, on the server voice will be converted to text and finally text will be sent back to our app.

I have created a simple app to demonstrate this tutorial. Below is the screenshot of the app which contains a simple button to invoke speech input and a Text-View to display the converted speech text.


Now follow the coding to develop this simple application 

1. stt_layout.xml


<RelativeLayout 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"
    android:background="@drawable/bg_gradient"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/txtSpeechInput"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp"
        android:textColor="@color/white"
        android:textSize="26dp"
        android:textStyle="normal" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="60dp"
        android:gravity="center"
        android:orientation="vertical" >

        <ImageButton
            android:id="@+id/btnSpeak"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@null"
            android:src="@drawable/mic_black" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="@string/tap_on_mic"
            android:textColor="@color/white"
            android:textSize="15dp"
            android:textStyle="normal" />
    </LinearLayout>

</RelativeLayout>


2.Do the following changes in your MainActivity.java

Step 1: Starting RecognizerIntent
First we need to create a RecognizerIntent by setting necessary flags such as
ACTION_RECOGNIZE_SPEECH – Simply takes user’s speech input and returns it to same activityLANGUAGE_MODEL_FREE_FORM – Considers input in free form EnglishEXTRA_PROMPT – Text prompt to show to the user when asking them to speak
Step 2: Receiving the speech response
Once the speech input is done we have to catch the response in onActivityResult and take appropriate action needed.

MainActivity.java

public class MainActivity extends Activity {

private TextView txtSpeechInput;
private ImageButton btnSpeak;
private final int REQ_CODE_SPEECH_INPUT = 100;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

txtSpeechInput = (TextView) findViewById(R.id.txtSpeechInput);
btnSpeak = (ImageButton) findViewById(R.id.btnSpeak);

// hide the action bar
getActionBar().hide();

btnSpeak.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
promptSpeechInput();
}
});

}

/**
* Showing google speech input dialog
* */
private void promptSpeechInput() {
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
intent.putExtra(RecognizerIntent.EXTRA_PROMPT,
getString(R.string.speech_prompt));
try {
startActivityForResult(intent, REQ_CODE_SPEECH_INPUT);
} catch (ActivityNotFoundException a) {
Toast.makeText(getApplicationContext(),
getString(R.string.speech_not_supported),
Toast.LENGTH_SHORT).show();
}
}

/**
* Receiving speech input
* */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);

switch (requestCode) {
case REQ_CODE_SPEECH_INPUT: {
if (resultCode == RESULT_OK && null != data) {

ArrayList<String> result = data
.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
txtSpeechInput.setText(result.get(0));
}
break;
}

}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

_____________________________________________

Source code for this application speechtotext.zip 

                                    Happing Coding...

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