firebase_dynamic_links bug fix: support clicking on link while app is running.

This commit checks for dynamic links on any new intent and remove the
limitation for the fluter activity intent only.
This way users can retrieve the dynamic link that was clicked while the app
was running.
In addition the old links is cleaned up every time the link was sent
successfully to the user to get a better and more expected behavior.
This behavior now matches the behavior on ios.

Author: roeierez

packages/firebase_dynamic_links/android/src/main/java/io/flutter/plugins/firebasedynamiclinks/FirebaseDynamicLinksPlugin.java

@@ -1,5 +1,6 @@
 package io.flutter.plugins.firebasedynamiclinks;
 
+import android.content.Intent;
 import android.net.Uri;
 import androidx.annotation.NonNull;
 import com.google.android.gms.tasks.OnCompleteListener;
@@ -13,6 +14,7 @@
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
 import io.flutter.plugin.common.MethodChannel.Result;
+import io.flutter.plugin.common.PluginRegistry;
 import io.flutter.plugin.common.PluginRegistry.Registrar;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -22,9 +24,22 @@
 /** FirebaseDynamicLinksPlugin */
 public class FirebaseDynamicLinksPlugin implements MethodCallHandler {
   private Registrar registrar;
+  private Map<String, Object> dynamicLinkData;
+  private Task extractIntentLinkTask;
 
   private FirebaseDynamicLinksPlugin(Registrar registrar) {
     this.registrar = registrar;
+
+    registrar.addNewIntentListener(
+        new PluginRegistry.NewIntentListener() {
+          @Override
+          public boolean onNewIntent(Intent intent) {
+            checkLinkOnIntent(intent);
+            return false;
+          }
+        });
+
+    checkLinkOnIntent(registrar.activity().getIntent());
   }
 
   public static void registerWith(Registrar registrar) {
@@ -61,29 +76,14 @@ public void onMethodCall(MethodCall call, Result result) {
   }
 
   private void handleRetrieveDynamicLink(final Result result) {
-    FirebaseDynamicLinks.getInstance()
-        .getDynamicLink(registrar.activity().getIntent())
+    extractIntentLinkTask
         .addOnCompleteListener(
             registrar.activity(),
             new OnCompleteListener<PendingDynamicLinkData>() {
               @Override
               public void onComplete(@NonNull Task<PendingDynamicLinkData> task) {
-                if (task.isSuccessful()) {
-                  PendingDynamicLinkData data = task.getResult();
-                  if (data != null) {
-                    Map<String, Object> dynamicLink = new HashMap<>();
-                    dynamicLink.put("link", data.getLink().toString());
-
-                    Map<String, Object> androidData = new HashMap<>();
-                    androidData.put("clickTimestamp", data.getClickTimestamp());
-                    androidData.put("minimumVersion", data.getMinimumAppVersion());
-
-                    dynamicLink.put("android", androidData);
-                    result.success(dynamicLink);
-                    return;
-                  }
-                }
-                result.success(null);
+                result.success(dynamicLinkData);
+                dynamicLinkData = null;
               }
             })
         .addOnFailureListener(
@@ -274,4 +274,31 @@ private static <T> T valueFor(String key, Map<String, Object> map) {
     T result = (T) map.get(key);
     return result;
   }
+
+  private void checkLinkOnIntent(Intent intent) {
+    extractIntentLinkTask =
+        FirebaseDynamicLinks.getInstance()
+            .getDynamicLink(intent)
+            .addOnCompleteListener(
+                registrar.activity(),
+                new OnCompleteListener<PendingDynamicLinkData>() {
+                  @Override
+                  public void onComplete(@NonNull Task<PendingDynamicLinkData> task) {
+                    if (task.isSuccessful()) {
+                      PendingDynamicLinkData data = task.getResult();
+                      if (data != null) {
+                        Map<String, Object> linkData = new HashMap<>();
+                        linkData.put("link", data.getLink().toString());
+
+                        Map<String, Object> androidData = new HashMap<>();
+                        androidData.put("clickTimestamp", data.getClickTimestamp());
+                        androidData.put("minimumVersion", data.getMinimumAppVersion());
+
+                        linkData.put("android", androidData);
+                        dynamicLinkData = linkData;
+                      }
+                    }
+                  }
+                });
+  }
 }