title: speech recognition intent not opening on button click
body: <p>I am working on a simple assistant app intially by hardcoding what it replies. It has a button which on clicked shows up the voice recognizer intent. but it is not showing up now on button click. I have attached my code here please help me to find the mistake causing the error. </p>
  
  <p>also please help me how to invoke the speech recognizer without tapping on the button, by just saying some specified word as in 'Ok google'.</p>
  
  <p><strong>MainActivity.java</strong></p>
  
  <pre><code>package com.example.rv00485448.neha1;
  
  import android.content.Intent;
  import android.os.Build;
  import android.speech.RecognizerIntent;
  import android.speech.SpeechRecognizer;
  import android.speech.tts.TextToSpeech;
  import android.speech.tts.UtteranceProgressListener;
  import android.app.Activity;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.View;
  import java.util.ArrayList;
  import java.util.Locale;
  
  import static android.speech.RecognizerIntent.ACTION_RECOGNIZE_SPEECH;
  
  public class MainActivity extends Activity{
  
  
      private TextToSpeech tts;
      private ArrayList&lt;String&gt; questions;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
  
          findViewById(R.id.microphoneButton).setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  listen();
              }
          });
          loadQuestions();
  
          tts = new TextToSpeech(MainActivity.this, new TextToSpeech.OnInitListener() {
              @Override
              public void onInit(int status) {
                  if (status == TextToSpeech.SUCCESS) {
                      int result = tts.setLanguage(Locale.US);
                      if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) {
                          Log.e("TTS", "This Language is not supported");
                      }
                      speak("Hello");
  
                  } else {
                      Log.e("TTS", "Initilization Failed!");
                  }
              }
          });
  
      }
  
      private void loadQuestions(){
          questions = new ArrayList&lt;&gt;();
           questions.clear();
          questions.add("hi how are you");
          questions.add("I am good. how are you feeling today?");
          questions.add("Do you have vitals readings?");
          questions.add("you seem to have fever. Do you want me to book an appointment with doctor nandan ");
          questions.add("I have booked an appointment with doctor nandan at 5 PM");
          questions.add("Thank you too");
     }
  
      private void listen(){
          Intent i = new Intent(ACTION_RECOGNIZE_SPEECH);
          i.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
          i.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
          i.putExtra(RecognizerIntent.EXTRA_PROMPT, "Say something");
       //   speak("I am listening to you");
   //        try {
  //            startActivityForResult(i, 100);
   //        } catch (ActivityNotFoundException a) {
  //            Toast.makeText(MainActivity.this, "Your device doesn't support Speech Recognition", Toast.LENGTH_SHORT).show();
  //        }
  
  }
  
  
  
      @Override
      public void onDestroy() {
          if (tts != null) {
              tts.stop();
              tts.shutdown();
          }
          super.onDestroy();
      }
  
      private void speak(String text){
          if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.LOLLIPOP) {
          tts.speak(text, TextToSpeech.QUEUE_FLUSH, null, null);
  
          }else{
              tts.speak(text, TextToSpeech.QUEUE_FLUSH, null);
          }
      }
  
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data)     {
           super.onActivityResult(requestCode, resultCode, data);
          if(requestCode == 100){
              if (resultCode == RESULT_OK &amp;&amp; null != data) {
                  ArrayList&lt;String&gt; res = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
                  String inSpeech = res.get(0);
                  recognition(inSpeech);
              }
          }
      }
  
      private void recognition(String text){
  
          switch (text)
          {
              case "hello":
              {
                  speak(questions.get(0));
                  break;
              }
  
              case "fine how about you":
              {
                  speak(questions.get(1));
                  break;
              }
  
              case "feeling dizzy":
              {
                  speak(questions.get(2));
                  break;
               }
  
                 case "yeah":
                   {
                      speak(questions.get(3));
                      break;
                   }
  
              case "yes":
              {
                  speak(questions.get(4));
                  break;
              }
  
              case "thank you":
              {
                  speak(questions.get(5));
                   break;
              }
  
          }
      }
  }
  </code></pre>