How to use SpeechRecognizer API in Android App?

This example demonstrates how do I SpeechRecognizer API in android.

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"
   android:orientation="vertical"
   android:padding="16sp"
   tools:context=".MainActivity">
<TextView
   android:id="@+id/textView"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginTop="40dp"
   android:textSize="16sp"
   android:textStyle="bold" />
</LinearLayout>

Step 3 − Add the following code to src/MainActivity.java

package app.com.sample;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.widget.TextView;
import java.util.List;
public class MainActivity extends AppCompatActivity {
   private final int REQUEST_SPEECH_RECOGNIZER = 3000;
   private TextView textView;
   private final String mQuestion = "Which company is the largest online retailer on the planet?";
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      textView = findViewById(R.id.textView);
      startSpeechRecognizer();
   }
   private void startSpeechRecognizer() {
      Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
      intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
      RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
      intent.putExtra(RecognizerIntent.EXTRA_PROMPT, mQuestion);
      startActivityForResult(intent, REQUEST_SPEECH_RECOGNIZER);
   }
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
      if (requestCode == REQUEST_SPEECH_RECOGNIZER) {
         if (resultCode == RESULT_OK) {
            List<String> results = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
            String mAnswer = results.get(0);
            if (mAnswer.toUpperCase().contains("AMAZON"))
               textView.setText(String.format("

Question: %s

Your answer is '%s' and it is
correct!", mQuestion, mAnswer));
            else
               textView.setText(String.format("

Question: %s

Your answer is '%s' and it is
incorrect!", mQuestion, mAnswer));
         }
      }
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="app.com.sample">
   <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>
<uses-permission android:name="android.permission.RECORD_AUDIO" />
</manifest>

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 the android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −