我尝试实现animalAdapter.addNewAnimal（animal），但我的应用因此错误而崩溃：
Process: com.example.navigationcomponentexercise, PID: 15974
java.lang.UnsupportedOperationException
at java.util.AbstractList.add(AbstractList.java:148)
at java.util.AbstractList.add(AbstractList.java:108)
at com.example.navigationcomponentexercise.animal.AnimalAdapter.addNewAnimal(AnimalAdapter.java:61)
at com.example.navigationcomponentexercise.animal.AnimalFragment.onCreateView(AnimalFragment.java:62)
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2698)
at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:310)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1185)
at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2222)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1995)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1951)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1847)
at androidx.fragment.app.FragmentManager$4.run(FragmentManager.java:413)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7073)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)
因此，我当前的问题是，我正在将数据从一个Fragment传递到另一个Fragment，并尝试将通过捆绑软件传递的数据添加到我的Adapter，但是我的方法无法正常工作。关于应该做什么而不是将我的捆绑包从一个碎片传递到另一个碎片的任何想法？我正在尝试从AddAnimalFragment抓取文本，并将该数据添加到我的List animalList
这是我的Animal.java
public class Animal {
private String name;
private String deets;
public Animal(String name, String deets) {
this.name = name;
this.deets = deets;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDeets() {
return deets;
}
public void setDeets(String deets) {
this.deets = deets;
}
}
这是我的AnimalFragment.java
public class AnimalFragment extends Fragment {
private RecyclerView rvAnimals;
private FloatingActionButton fabAddNewAnimal;
private AnimalAdapter animalAdapter;
private TextView tvAnimalName, tvDeets;
List<Animal> animalList = new ArrayList<>();
public AnimalFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_animal, container, false);
fabAddNewAnimal = view.findViewById(R.id.fabNewAnimal);
rvAnimals = view.findViewById(R.id.rvAnimals);
rvAnimals.setLayoutManager(new LinearLayoutManager(requireContext()));
animalAdapter = new AnimalAdapter();
rvAnimals.setAdapter(animalAdapter);
tvAnimalName = view.findViewById(R.id.tvAnimalName);
tvDeets = view.findViewById(R.id.tvDeets);
Bundle bundle = this.getArguments();
if(bundle !=null){
String name = bundle.getString("animal");
String deets = bundle.getString("deets");
Animal animal = new Animal(name, deets);
animal.setName(name);
animal.setDeets(deets);
}
return view;
}
@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
fabAddNewAnimal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final NavController navController = Navigation.findNavController(view);
navController.navigate(R.id.action_animalFragment_to_addAnimalFragment);
}
});
}
}
这是我的AnimalAdapter.java
public class AnimalAdapter extends RecyclerView.Adapter<AnimalAdapter.AnimalViewHolder> {
private List<Animal> animalList;
public AnimalAdapter(){
animalList = Arrays.asList(
new Animal("Johny", "Johny is a lil doggy"),
new Animal("Zabomafoo", "Ahh yes the animal who turns into a clay dude"),
new Animal("Clifford", "Clifford was cute! That gal was lucky to have a huge red dog like him"),
new Animal("Courage", "Omg Another one of my favorite childhood cartoon pets! He was so adorable, especially his love for murial"),
new Animal("Garfield", "All that fat cat did was eat lasagna and complain about Mondays")
);
}
@NonNull
@Override
public AnimalViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(
R.layout.animal_view, parent, false
);
return new AnimalViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull AnimalViewHolder holder, int position) {
Animal animal = animalList.get(position);
holder.tvAnimalName.setText(animal.getName());
holder.tvDeets.setText(animal.getDeets());
//holder.tvAnimalName.setText(animal.setName("Banana"));
}
@Override
public int getItemCount() {
return animalList.size();
}
public void addNewAnimal(Animal animal) {
animalList.add(animal);
notifyItemInserted(animalList.size() - 1);
}
public class AnimalViewHolder extends RecyclerView.ViewHolder {
TextView tvAnimalName, tvDeets;
public AnimalViewHolder(@NonNull View itemView) {
super(itemView);
tvAnimalName = itemView.findViewById(R.id.tvAnimalName);
tvDeets = itemView.findViewById(R.id.tvDeets);
}
}
}
这是我的AddAnimalFragment.java
public class AddAnimalFragment extends Fragment {
private FloatingActionButton fabAddNewAnimal;
EditText newAnimal, newDeets;
public AddAnimalFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_add_animal, container, false);
fabAddNewAnimal = view.findViewById(R.id.fabNewAnimal);
newAnimal = view.findViewById(R.id.etAnimal);
newDeets = view.findViewById(R.id.etDeets);
return view;
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
fabAddNewAnimal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Bundle bundle = new Bundle();
String animal = newAnimal.getText().toString();
String deets = newDeets.getText().toString();
bundle.putString("animal", animal);
bundle.putString("deets", deets);
final NavController navController = Navigation.findNavController(view);
navController.navigate(R.id.action_addAnimalFragment_to_animalFragment, bundle);
}
});
}
}