android: IllegalStateException when calling unregisterReceiver() (#72)

* Updated existing unregisterReceiver method

* Catching possible exceptions that may occur when unregistering a receiver (like IllegalArgumentException)

Author: lrorthmann

android/src/main/java/com/zxcpoiu/incallmanager/InCallManagerModule.java

@@ -309,12 +309,7 @@ public void onReceive(Context context, Intent intent) {
     private void stopWiredHeadsetEvent() {
         if (wiredHeadsetReceiver != null) {
             Log.d(TAG, "stopWiredHeadsetEvent()");
-            ReactContext reactContext = getReactApplicationContext();
-            if (reactContext != null) {
-                reactContext.unregisterReceiver(wiredHeadsetReceiver);
-            } else {
-                Log.d(TAG, "stopWiredHeadsetEvent() reactContext is null");
-            }
+            this.unregisterReceiver(this.wiredHeadsetReceiver);
             wiredHeadsetReceiver = null;
         }
     }
@@ -344,12 +339,7 @@ public void onReceive(Context context, Intent intent) {
     private void stopNoisyAudioEvent() {
         if (noisyAudioReceiver != null) {
             Log.d(TAG, "stopNoisyAudioEvent()");
-            ReactContext reactContext = getReactApplicationContext();
-            if (reactContext != null) {
-                reactContext.unregisterReceiver(noisyAudioReceiver);
-            } else {
-                Log.d(TAG, "stopNoisyAudioEvent() reactContext is null");
-            }
+            this.unregisterReceiver(this.noisyAudioReceiver);
             noisyAudioReceiver = null;
         }
     }
@@ -416,12 +406,7 @@ public void onReceive(Context context, Intent intent) {
     private void stopMediaButtonEvent() {
         if (mediaButtonReceiver != null) {
             Log.d(TAG, "stopMediaButtonEvent()");
-            ReactContext reactContext = getReactApplicationContext();
-            if (reactContext != null) {
-                reactContext.unregisterReceiver(mediaButtonReceiver);
-            } else {
-                Log.d(TAG, "stopMediaButtonEvent() reactContext is null");
-            }
+            this.unregisterReceiver(this.mediaButtonReceiver);
             mediaButtonReceiver = null;
         }
     }
@@ -1681,8 +1666,17 @@ private void registerReceiver(BroadcastReceiver receiver, IntentFilter filter) {
     }
 
     /** Helper method for unregistration of an existing receiver. */
-    private void unregisterReceiver(BroadcastReceiver receiver) {
-        getReactApplicationContext().unregisterReceiver(receiver);
+    private void unregisterReceiver(final BroadcastReceiver receiver) {
+        final ReactContext reactContext = this.getReactApplicationContext();
+        if (reactContext != null) {
+            try {
+                reactContext.unregisterReceiver(receiver);
+            } catch (final Exception e) {
+                Log.d(TAG, "unregisterReceiver() failed");
+            }
+        } else {
+            Log.d(TAG, "unregisterReceiver() reactContext is null");
+        }
     }
 
     /** Sets the speaker phone mode. */