fix(android) fix joining meetings in quick succession

If the readyToClose event was fired there is no need to "leave" the
meeting, it just circles back to the app unnecessarily, potentially
creating another readyToClose event.

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetActivity.java

@@ -54,6 +54,8 @@ public class JitsiMeetActivity extends AppCompatActivity
     private static final String ACTION_JITSI_MEET_CONFERENCE = "org.jitsi.meet.CONFERENCE";
     private static final String JITSI_MEET_CONFERENCE_OPTIONS = "JitsiMeetConferenceOptions";
 
+    private boolean isReadyToClose;
+
     private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
@@ -124,14 +126,19 @@ public void onStop() {
 
     @Override
     public void onDestroy() {
+        JitsiMeetLogger.i("onDestroy()");
+
         // Here we are trying to handle the following corner case: an application using the SDK
         // is using this Activity for displaying meetings, but there is another "main" Activity
         // with other content. If this Activity is "swiped out" from the recent list we will get
         // Activity#onDestroy() called without warning. At this point we can try to leave the
         // current meeting, but when our view is detached from React the JS <-> Native bridge won't
         // be operational so the external API won't be able to notify the native side that the
         // conference terminated. Thus, try our best to clean up.
-        leave();
+        if (!isReadyToClose) {
+            JitsiMeetLogger.i("onDestroy(): leaving...");
+            leave();
+        }
 
         this.jitsiView = null;
 
@@ -149,8 +156,12 @@ public void onDestroy() {
 
     @Override
     public void finish() {
-        leave();
+        if (!isReadyToClose) {
+            JitsiMeetLogger.i("finish(): leaving...");
+            leave();
+        }
 
+        JitsiMeetLogger.i("finish(): finishing...");
         super.finish();
     }
 
@@ -252,6 +263,7 @@ protected void onParticipantLeft(HashMap<String, Object> extraData) {
 
     protected void onReadyToClose() {
         JitsiMeetLogger.i("SDK is ready to close");
+        isReadyToClose = true;
         finish();
     }