How to solve warning Unchecked cast android studio?
Solution 1: If all you have to work from is an , then you can’t check at runtime that you actually have a , because the generic type is only used for compile-time type checking, it is not available at runtime. UPDATE I have this global variable: how I receive it due to comments and answers: and I have this part yellow and warning: Solution 1: You could use a safe cast to get an optional value from your bundle like So your would be of type .
How to solve warning Unchecked cast android studio?
Unchecked cast: Serializable! to kotlin.collections.HashMap /* = java.util.HashMap */ filterData = bundle.getSerializable("filter_data") as HashMap I saw this question and this one but I didn’t manage to solve my problem. I have to get data by bundle at fragments. Maybe someone had similar problem and knows how to solve it?
UPDATE
var filterData: HashMap = HashMap() how I receive it due to comments and answers:
when < bundle.containsKey("filter_data") ->< val serializable = bundle.getSerializable("filter_data") if(serializable is java.util.HashMap) < filterData = bundle.getSerializable("filter_data") as HashMapSingleton.filter_data = filterData getJobList(offset, type, sp.getString("access_token", ""), bundle.getSerializable("filter_data") as HashMap, false) > > . > and I have this as HashMap part yellow and warning:
Unchecked cast: Serializable! to kotlin.collections.HashMap /* = java.util.HashMap */ You could use a safe cast to get an optional value from your bundle like
filterData = bundle.getSerializable("filter_data") as? HashMap So your filterData would be of type HashMap? . In case the cast would fail, filterData would be null and you would have to handle that case.
Try to apply @Vladyslav Matviienko solution like following.
var filterData = bundle.getSerializable("filter_data") as HashMap Android — Unchecked Cast error while passing an, This is the class which receives the arraylists from antoher class using intent. I get an unchecked cast warning: «Unchecked cast: ‘java.io.Serializable’ to ‘java.util.ArrayList
Type safety: Unchecked cast from Object to List
I have a ListView listing a custom object (let’s say MyObject ).
I want to filter it dynamically through an EditText so I had to implement a getFilter() with a publishResults method:
@Override protected void publishResults(CharSequence constraint, FilterResults results) < MyObjectAdapter.this.setItems((List) results.values); MyObjectAdapter.this.notifyDataSetChanged(); > At this point, Eclipse complains: Type safety: Unchecked cast from Object to List
I am sure this cast will always be true, but Eclipse only suggests to add @SuppressWarnings(«unchecked») but I’m totally against SuppressWarnings because it’s only hiding the problem, not a solution.
if(results.values instanceof List) But Eclipse complains again, and this solves nothing.
Cannot perform instanceof check against parameterized type List. Use the form List
I know the casting will always be correct, but which is the proper way to make the code to be sure results.values is actually a List ?
If all you have to work from is an Object , then you can’t check at runtime that you actually have a List , because the generic type MyObject is only used for compile-time type checking, it is not available at runtime. This is why you get an error when you try to add the instanceof check.
If you are sure that your Object really is always a List then I’d say the @SuppressWarnings is OK, if you document why you are sure it is not a problem.
If you absolutely want to avoid a warning though, you could create your own List implementation (say, MyObjectList ) that is not itself generic but implements List . Then you can do an instanceof check against MyObjectList at runtime.
Another option is to check for and cast to List as the instanceof error suggests. Then you can iterate over the elements in the list and check if they are actually all instances of MyObject, and copy them to a new List .
Well, I finally managed to find a solution.
Another option is to check for and cast to List as the instanceof error suggests. Then you can iterate over the elements in the list and check if they are actually all instances of MyObject, and copy them to a new List.
Even though I did not went through the process of creating a whole new object in order to make this particular case to work «warning-less» this was the right direction to go.
So I took @lokoko ‘s idea and use it in a new setItems() method, with an Object parameter instead of a List in order to make sure
The result code is the following:
public void setItems(List var) < this.list = var; >public void setItems(Object var) < Listresult = new ArrayList(); if (var instanceof List)< for(int i = 0; i < ((List)var).size(); i++)< Object item = ((List) var).get(i); if(item instanceof MyObject) < result.add((MyObject) item); >> > setItems(result); > Thanks everyone for your help!
List result = (List) results.values; for (Object object : result) < if (object instanceof MyObject) < tempList.add((MyObject) object); // > filteredItems = tempList; // You can perform the checking before passing it to setItems() .
final Object myListObj = reuslts.values; if(myListObj instanceof List) < if(((List)myListObj).get(0) instanceof MyObject) // You can safely suppress the warning here because you made sure it is a List containing MyObject MyObjectAdapter.this.setItems((List) myListObj); > However, you need to change your setItems() method accordingly:
public void setItems(List list) < // Your code here >Java: How to fix the Unchecked cast warning, Component: Component result = store.get (e); When you cast Component to T, the compiler issues a warning because the cast cannot be checked statically. But if you're sure of the semantics of your data structure, you can simply suppress the warning. @SuppressWarnings ("unchecked") T resultT = (T)result;
How to solve Unchecked cast in android without suppressing the warning
How do I solve this issue without using SuppressWarning("uncheckedcast"), this there any way to check the object before casting it or any other way to solve this issue. The problem is inside onLoadFinished(). I am using the data for different datatypes as you can see, first as boolean and then List. Thank you in advance.
package com.howaboutthis.satyaraj.wallpaper; import android.support.v4.app.Fragment; import android.support.v4.content.Loader; import android.content.Context; import android.content.DialogInterface; import android.support.v4.app.LoaderManager; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import java.util.ArrayList; import java.util.List; import java.util.Objects; public class FragmentChanging extends Fragment implements LoaderManager.LoaderCallbacks < private ProgressDialog dialog; public FragmentChanging()< >@Override public void onCreate(Bundle savedInstanceState) < super.onCreate(savedInstanceState); >@Override public View onCreateView(final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) < final View view = inflater.inflate(R.layout.fragment_changing_wallpaper, container, false); getLoaderMangaer.init(0,null,FragmentChanging.this); return view; >@Override public Loader onCreateLoader(int id, Bundle args) < if (id == 0 || 2)< dialog.setMessage("Loading Settings. "); dialog.show(); >return new TestInternetLoader(getContext()); > return null; > @Override public void onLoadFinished(Loader loader, Object data) < int if (id == 0 || 2)< boolean check = (Boolean) data; if (check) if (dialog.isShowing()) dialog.dismiss(); >else if(id == 3) List bitmaps = (List) data; //Unchecked cast > @Override public void onLoaderReset(Loader loader) < >> You can get rid of the lint warning by using a LoaderManager.LoaderCallbacks> . If you want to do so, you'll have to change (almost) every occurrence of Loader to Loader> . (An exception seems to be onLoaderReset(Loader loader) )
Moreover, if you use a custom AsyncTaskLoader it would have to extend AsyncTaskLoader> .
@Override public void onLoadFinished(Loader> loader, List data) < Listbitmaps = data; > If the suggested approach is not possible because the type of data may vary you can check for the types you are going to handle like this:
if (data instanceof List) < List temp = (List)data; // do what's required for List data // (if necessary do a type check on list elements) if (tempList.size() >0) < Object firstItem = tempList.get(0); if (firstItem instanceof Bitmap)< // now you know that your Loader gave you a List with at least one Bitmap Listbitmaps = new ArrayList<>(); for (Object item: tempList) < if (item instanceof Bitmap)< bitmaps.add((Bitmap) item); >> > > > else if (data instanceof Boolean) < boolean check = (Boolean) data; if (check)< // handle Boolean data >> Android - Is there any way to handle unchecked cast, I am using ViewModelFactory in my android app to pass some data to my ViewModel from Fragment. I'm getting unchecked cast warning. If I'm using Supress the warning goes away. I was wondering is there any way to handle this without using Supress("UNCHECKED_CAST") The code I'm using to create the …