cheesesquare | Demos the new Android Design library | Android library

I am trying to send certain characters from an "alarm notification" activity in the android device to a Bluetooth receiver. But when I try to send the data an exception is thrown that I am passing a null object through the write() method. I can't understand how the object is NULL when I am initializing it in the activity.

When I try to send the same character from within an activity different from "alarm notification" it works fine.

Is there some code within "alarm notification" activity that hinders this?

Please forgive my amateur coding skills and guide me in the right direction.

Thank you.

AlarmNotification.java

I have an issue with Shared Element Transition. When I return to MainActivity from DetailActivity, FAB blinking Gif example

I used this sample project. For shared element transition I made:

1. Enabled Window Content Transitions in styles.xml
   true
2. Assign a common transition name to the shared elements in both layouts. android:transitionName="image"
3. Started the target activity by specifying a bundle of those shared elements and views from the source
   holder.mView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Context context = v.getContext(); Intent intent = new Intent(context, CheeseDetailActivity.class); intent.putExtra(CheeseDetailActivity.EXTRA_NAME, holder.mBoundString); MainActivity activity = (MainActivity) context; ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(activity, new Pair<>(holder.mView.findViewById(R.id.avatar), "image")); ActivityCompat.startActivity(context,intent, options.toBundle()); } });
   And when i press back button, FAB from detail Activity blinks in Main activity.
   I did not find a similar problem, so thanks for any help!

I am getting Error:This Gradle plugin requires Studio 3.0 minimum when importing project
Project repo: https://github.com/chrisbanes/cheesesquare
I had tried mentioned solution provided here and here but nothing worked :(

I am getting mentioned error when importing this project: https://github.com/chrisbanes/cheesesquare.

I have taken sample code from https://github.com/chrisbanes/cheesesquare as base to show images in StaggeredGridLayoutManager. StaggeredGridLayoutManager with recyclerview showing only two images per page.

I tried almost all ways to show multiple images in full page, but its not working. Any help would be great.

I am looking at Cheesesquare to learn some new design tools and I came across this bit of code that left me wondering. The code finds a view, then checks if it is null before continuing its setup.

Why would the view ever return null, assuming it exists and the id matches?

I trust the expertise of the person who wrote this code and I assume it is not a mistake, but what is its purpose? When should I check for null values and when is it unnecessary?