架构师小明
1/9/2025
Hey devs! 👋
I'm working on my first Android app using Kotlin, and I'm kinda stuck. 😅 I've got a RecyclerView displaying a list of contacts from the phone, which is awesome, but the search functionality is driving me nuts! I've watched a ton of tutorials, but my search just won't work right. 😩
Here's the deal: I've set up a SearchView to filter through the contacts, but it seems like the filtering logic isn't kicking in properly. When I type in the search bar, it doesn't filter the list as expected. Sometimes it doesn't even show the "No Contact found!" message when it should. 🤔
Here's a snippet of my MainActivity where I'm trying to handle the search:
// ... existing code ... searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener { override fun onQueryTextSubmit(query: String?): Boolean { return false } override fun onQueryTextChange(newText: String?): Boolean { filterList(newText) return true } }) //search filter private fun filterList(query: String?) { if (query != null) { val filteredList = arrayList // Should this be a new list? for (i in mList) { if (i.contname.lowercase(Locale.ROOT).contains(query)) { filteredList.add(i) } } if (filteredList.isEmpty()){ Toast.makeText(this,"No Contact found!", Toast.LENGTH_SHORT).show() }else{ adapter.setFilteredList(arrayList) // Is this the right list? } } } // ... existing code ...
And here's a bit from my adapter:
// ... existing code ... fun setFilteredList(contactList: List<ContactModel>){ this.contactList = contactList as ArrayList<ContactModel> notifyDataSetChanged() } // ... existing code ...
I've tried tweaking the filter logic, changing how I update the adapter, and even re-watching some tutorials, but no luck. 😭
Any ideas on what I might be missing? Is there something obvious I'm overlooking? I really appreciate any help you can throw my way! 🙏
PS: I'm coming from a VB.NET background, so this whole Android/Kotlin thing is a bit of a learning curve for me. Thanks for your patience! 😊
Keywords: Android Kotlin RecyclerView SearchView filter contacts
程序员小明
1/9/2025
Hey there! 👋 I totally get your frustration with getting the SearchView to work with your RecyclerView in Kotlin. I've been down that road too, and it can be a bit of a head-scratcher at first. 😅
When I first started with Android development, I remember spending hours trying to figure out why my list wasn't filtering correctly. It turned out to be a simple oversight, so let's see if we can get yours sorted out!
Create a New Filtered List: It looks like you're trying to filter your list, but you might be reusing the same list (arrayList) instead of creating a new one. This can cause issues because you're modifying the list you're iterating over. Let's fix that by creating a new list for the filtered results.
Update the Adapter with the Correct List: Make sure you're passing the newly filtered list to your adapter.
Here's how you can tweak your code:
// ... existing code ... searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener { override fun onQueryTextSubmit(query: String?): Boolean { return false } override fun onQueryTextChange(newText: String?): Boolean { filterList(newText) return true } }) //search filter private fun filterList(query: String?) { if (query != null) { val filteredList = ArrayList<ContactModel>() // Create a new list for filtered results for (i in mList) { if (i.contname.lowercase(Locale.ROOT).contains(query.lowercase(Locale.ROOT))) { filteredList.add(i) } } if (filteredList.isEmpty()) { Toast.makeText(this, "No Contact found!", Toast.LENGTH_SHORT).show() } else { adapter.setFilteredList(filteredList) // Pass the new filtered list } } } // ... existing code ...
Case Sensitivity: Make sure to handle case sensitivity by converting both the contact name and the query to lowercase before comparing them. This ensures that "John" and "john" are treated the same.
Notify the Adapter: Your setFilteredList method in the adapter looks good. Just ensure that notifyDataSetChanged() is called after updating the list to refresh the view.
Common Mistake: Double-check that your mList is the original list of contacts and not being modified elsewhere. This list should remain unchanged to always have the full set of data to filter from.
You're doing great, and it's awesome that you're diving into Android development with Kotlin. It's a learning curve, but you're on the right track. If you hit any more bumps, feel free to ask. We're all here to help each other out! 😊
Good luck, and happy coding! If you need more help, just give me a shout! 📱✨