Adding removeListener

README.md

@@ -71,3 +71,7 @@ In the case you want to cancel a progressing operation:
         mMozillaSpeechService.cancel();
 ```
 
+To remove a listener:
+```
+        mMozillaSpeechService.removeListener(aListener);
+```

app/src/main/java/com/mozilla/speechapp/MainActivity.java

@@ -37,7 +37,6 @@ public class MainActivity extends AppCompatActivity implements ISpeechRecognitio
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         mMozillaSpeechService = MozillaSpeechService.getInstance();
-        mMozillaSpeechService.addListener(this);
         initialize();
     }
 
@@ -62,6 +61,7 @@ public class MainActivity extends AppCompatActivity implements ISpeechRecognitio
         mPlain_text_input = findViewById(R.id.plain_text_input);
         mButtonStart.setOnClickListener((View v) ->  {
             try {
+                mMozillaSpeechService.addListener(this);
                 mDtstart = System.currentTimeMillis();
                 mSeries1.resetData(new DataPoint[0]);
                 mMozillaSpeechService.start(getApplicationContext());
@@ -107,22 +107,31 @@ public class MainActivity extends AppCompatActivity implements ISpeechRecognitio
                 case STT_RESULT:
                     String message = String.format("Success: %s (%s)", ((STTResult)aPayload).mTranscription, ((STTResult)aPayload).mConfidence);
                     mPlain_text_input.append(message + "\n");
+                    removeListener();
                     break;
                 case START_LISTEN:
                     mPlain_text_input.append("Started to listen\n");
                     break;
                 case NO_VOICE:
                     mPlain_text_input.append("No Voice detected\n");
+                    removeListener();
                     break;
                 case CANCELED:
                     mPlain_text_input.append("Canceled\n");
+                    removeListener();
                     break;
                 case ERROR:
                     mPlain_text_input.append("Error:" + aPayload + " \n");
+                    removeListener();
                     break;
                 default:
                     break;
             }
         });
     }
+
+    public void removeListener() {
+        mMozillaSpeechService.removeListener(this);
+    }
+
 }

mozillaspeechlibrary/src/main/java/com/mozilla/speechlibrary/MozillaSpeechService.java

@@ -63,7 +63,7 @@ public class MozillaSpeechService {
         mListeners.add(aListener);
     }
 
-    public void notifyListeners(MozillaSpeechService.SpeechState aState, Object aPayload) {
+    protected void notifyListeners(MozillaSpeechService.SpeechState aState, Object aPayload) {
         mState = aState;
         for (ISpeechRecognitionListener listener : mListeners) {
             listener.onSpeechStatusChanged(aState, aPayload);
@@ -77,4 +77,11 @@ public class MozillaSpeechService {
     public void cancel() {
         this.mSpeechRecognition.cancel();
     }
+
+    public void removeListener(ISpeechRecognitionListener aListener) {
+        if (mListeners != null) {
+            mListeners.remove(aListener);
+        }
+    }
+
 }