How To Handle Click Events In Android RecyclerViews
According to the documentation, a RecyclerView is a flexible view for providing a limited window into a large data set. If you have done any android development before, you definitely know the popular ListView class used to display lists of things. After its release by Google however, most of us have moved on and now use RecyclerViews
How I do RecyclerViews Click Events
In a given project, I am sure there will be more than one instances where I will need to use recyclerviews and so I will need to handle click events! So, to have a solution that can be reused, I normally create a class:
RecyclerItemClickListener.java
| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758 | publicclassRecyclerItemClickListener implementsRecyclerView.OnItemTouchListener{privateGestureDetector mGestureDetector;privateOnItemClickListener mListener;publicinterfaceOnItemClickListener{voidonItemClick(View view,intposition);voidonItemLongClick(View view,intposition);}publicRecyclerItemClickListener(Context context,finalRecyclerView recyclerView,OnItemClickListener listener){mListener=listener;mGestureDetector=newGestureDetector(context,newGestureDetector.SimpleOnGestureListener(){@OverridepublicbooleanonSingleTapUp(MotionEvente){returntrue;}@OverridepublicvoidonLongPress(MotionEvente){View childView=recyclerView.findChildViewUnder(e.getX(),e.getY());if(childView!=null&&mListener!=null){mListener.onItemLongClick(childView,recyclerView.getChildAdapterPosition(childView));}}});}@OverridepublicbooleanonInterceptTouchEvent(RecyclerView view,MotionEvente){View childView=view.findChildViewUnder(e.getX(),e.getY());if(childView!=null&&mListener!=null&&mGestureDetector.onTouchEvent(e)){mListener.onItemClick(childView,view.getChildAdapterPosition(childView));}returnfalse;}@OverridepublicvoidonTouchEvent(RecyclerView view,MotionEvent motionEvent){}@OverridepublicvoidonRequestDisallowInterceptTouchEvent(booleandisallowIntercept){}} |
Now, we are ready to implement this code in our recyclerview reference; could be inside your fragment or activity! Here is how you do that:
| 12345678910111213141516 | mRecyclerView.addOnItemTouchListener(newRecyclerItemClickListener(this,mRecyclerView,newRecyclerItemClickListener.OnItemClickListener(){@OverridepublicvoidonItemClick(View view,intposition){//handle click events here}@OverridepublicvoidonItemLongClick(View view,intposition){//handle longClick if any}})); |
RECYCLERVIEWS SUMMARY
So now that we have a reusable class, you can listen for clicks on those recyclerviews and respond appropriately since you have the position handed to you by the interface!
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Meanwhile, happy coding my people!