Hi I'm new to Android development and I'm trying out a tutorial on MVVM I found on YouTube. How to access RecyclerView in androidx?.Instead you need to access the object from the button's parent view. If you try to access the object from the button view it will be null, because the button does not have it. The EditText object that you want is not in the button, it is in the button's parent view. cardviewrecyclerviewnull MAINACTIVITY. The view in addItem(View v) is referring to the button only. CustomRecyclerAdapter mAdapter = new CustomRecyclerAdapter() You are redefining mAdapter, so you have 2 copies, one in local scope and one as a member to MainActivity. Still not sure why your views aren't getting populated, but I did notice an error with your adapter. Double check that textEt is the correct ID for this layout element. Usually this type of failure means that you aren't finding the right ID from your layout.
The method that is failing is EditText mText = (EditText) findViewById(R.id.textEt) "On line 53 of MainActivity.java, you tried to call a method on some object which doesn't exist yet, so I crashed." Everything seems to be working fine except drawing a delete icon below the item thats being swiped. Then that part of the error log will even tell you what line your code was failing on ( in this case it is line 53 on MainActivity.java).Ī Null Pointer Exception in Java is when you attempt to call a method on some object 'A', but that object 'A' is currently null. I am trying to implement swipe to delete in RecyclerView. The key is in your error message: Caused by: : Attempt to invoke virtual method ' ()' on a null object referenceĪt 2.MainActivity.addItem(MainActivity.java: 53)Ī good tip for learning from your error output is to look at each "Caused by" statement, and scan through the log until you find one of your own files referenced.
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