Merge pull request #637 from Firewayer/fix/fix_tab_fragment

fix多tab情况下，Fragment切换时生命周期未正确同步至Boost的Bug

android/src/main/java/com/idlefish/flutterboost/containers/FlutterFragment.java

@@ -259,14 +259,18 @@ public class FlutterFragment extends Fragment implements FlutterActivityAndFragm
     @Override
     public void onStart() {
         super.onStart();
+        if (!isHidden()) {
             delegate.onStart();
         }
+    }
 
     @Override
     public void onResume() {
         super.onResume();
+        if (!isHidden()) {
             delegate.onResume();
         }
+    }
 
     // TODO(mattcarroll): determine why this can't be in onResume(). Comment reason, or move if possible.
     @ActivityCallThrough
@@ -277,14 +281,18 @@ public class FlutterFragment extends Fragment implements FlutterActivityAndFragm
     @Override
     public void onPause() {
         super.onPause();
+        if (!isHidden()) {
             delegate.onPause();
         }
+    }
 
     @Override
     public void onStop() {
         super.onStop();
+        if (!isHidden()) {
             delegate.onStop();
         }
+    }
 
     @Override
     public void onDestroyView() {
@@ -300,6 +308,15 @@ public class FlutterFragment extends Fragment implements FlutterActivityAndFragm
         delegate = null;
     }
 
+    @Override
+    public void onHiddenChanged(boolean hidden) {
+        super.onHiddenChanged(hidden);
+        if (hidden) {
+            delegate.onPause();
+        } else {
+            delegate.onResume();
+        }
+    }
 
     @ActivityCallThrough
     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {