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How to develop a speech recognizer in android without Google API?
This example demonstrates how do I develop a speech recognizer in android without Google API.
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"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ImageView android:id="@+id/imageView1" android:layout_width="200dp" android:layout_height="200dp" android:layout_centerInParent="true" android:src="@drawable/ic_mic" /> <ProgressBar android:id="@+id/progressBar1" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/toggleButton1" android:layout_marginTop="28dp" android:paddingLeft="10dp" android:paddingRight="10dp" /> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/progressBar1" android:layout_centerHorizontal="true" android:layout_marginTop="47dp" /> <ToggleButton android:id="@+id/toggleButton1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="26dp" android:text="ToggleButton" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.java
package app.com.sample; import android.Manifest; import android.content.Intent; import android.content.pm.PackageManager; import android.os.Bundle; import android.speech.RecognitionListener; import android.speech.RecognizerIntent; import android.speech.SpeechRecognizer; import android.support.annotation.NonNull; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.CompoundButton; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast; import android.widget.ToggleButton; import java.util.ArrayList; public class MainActivity extends AppCompatActivity implements RecognitionListener { private static final int REQUEST_RECORD_PERMISSION = 100; private TextView returnedText; private ToggleButton toggleButton; private ProgressBar progressBar; private SpeechRecognizer speech = null; private Intent recognizerIntent; private String LOG_TAG = "VoiceRecognitionActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); returnedText = findViewById(R.id.textView1); progressBar = findViewById(R.id.progressBar1); toggleButton = findViewById(R.id.toggleButton1); progressBar.setVisibility(View.INVISIBLE); speech = SpeechRecognizer.createSpeechRecognizer(this); Log.i(LOG_TAG, "isRecognitionAvailable: " + SpeechRecognizer.isRecognitionAvailable(this)); speech.setRecognitionListener(this); recognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE,"US-en"); recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); recognizerIntent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 3); toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (isChecked) { progressBar.setVisibility(View.VISIBLE); progressBar.setIndeterminate(true); ActivityCompat.requestPermissions (MainActivity.this, new String[]{Manifest.permission.RECORD_AUDIO}, REQUEST_RECORD_PERMISSION); } else { progressBar.setIndeterminate(false); progressBar.setVisibility(View.INVISIBLE); speech.stopListening(); } } }); } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); switch (requestCode) { case REQUEST_RECORD_PERMISSION: if (grantResults.length > 0 && grantResults[0]== PackageManager.PERMISSION_GRANTED) { speech.startListening(recognizerIntent); } else { Toast.makeText(MainActivity.this, "Permission Denied!", Toast .LENGTH_SHORT).show(); } } } @Override public void onResume() { super.onResume(); } @Override protected void onPause() { super.onPause(); } @Override protected void onStop() { super.onStop(); if (speech != null) { speech.destroy(); Log.i(LOG_TAG, "destroy"); } } @Override public void onBeginningOfSpeech() { Log.i(LOG_TAG, "onBeginningOfSpeech"); progressBar.setIndeterminate(false); progressBar.setMax(10); } @Override public void onBufferReceived(byte[] buffer) { Log.i(LOG_TAG, "onBufferReceived: " + buffer); } @Override public void onEndOfSpeech() { Log.i(LOG_TAG, "onEndOfSpeech"); progressBar.setIndeterminate(true); toggleButton.setChecked(false); } @Override public void onError(int errorCode) { String errorMessage = getErrorText(errorCode); Log.d(LOG_TAG, "FAILED " + errorMessage); returnedText.setText(errorMessage); toggleButton.setChecked(false); } @Override public void onEvent(int arg0, Bundle arg1) { Log.i(LOG_TAG, "onEvent"); } @Override public void onPartialResults(Bundle arg0) { Log.i(LOG_TAG, "onPartialResults"); } @Override public void onReadyForSpeech(Bundle arg0) { Log.i(LOG_TAG, "onReadyForSpeech"); } @Override public void onResults(Bundle results) { Log.i(LOG_TAG, "onResults"); ArrayList<String> matches = results .getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION); String text = ""; for (String result : matches) text = result + "
"; returnedText.setText(text); } @Override public void onRmsChanged(float rmsdB) { Log.i(LOG_TAG, "onRmsChanged: " + rmsdB); progressBar.setProgress((int) rmsdB); } public static String getErrorText(int errorCode) { String message; switch (errorCode) { case SpeechRecognizer.ERROR_AUDIO: message = "Audio recording error"; break; case SpeechRecognizer.ERROR_CLIENT: message = "Client side error"; break; case SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS: message = "Insufficient permissions"; break; case SpeechRecognizer.ERROR_NETWORK: message = "Network error"; break; case SpeechRecognizer.ERROR_NETWORK_TIMEOUT: message = "Network timeout"; break; case SpeechRecognizer.ERROR_NO_MATCH: message = "No match"; break; case SpeechRecognizer.ERROR_RECOGNIZER_BUSY: message = "RecognitionService busy"; break; case SpeechRecognizer.ERROR_SERVER: message = "error from server"; break; case SpeechRecognizer.ERROR_SPEECH_TIMEOUT: message = "No speech input"; break; default: message = "Didn't understand, please try again."; break; } return message; } }
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"> <uses-permission android:name="android.permission.RECORD_AUDIO"/> <uses-permission android:name="android.permission.INTERNET" /> <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>
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 −
Click here to download the project code.