线性布局无法转换为RecyclerView onClickItemListener(Linear Layout Cannot be Cast to RecyclerView onClickItemLi

线性布局无法转换为RecyclerView onClickItemListener(Linear Layout Cannot be Cast to RecyclerView onClickItemListener)

我正在尝试实现一个onClickListener，以允许用户单击他们的朋友的RecyclerView列表。但是，单击用户列表项时，它只会返回错误：

01-18 20:39:37.317 3413-3413/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.android.feastappv2, PID: 3413 java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.support.v7.widget.RecyclerView$LayoutParams at android.support.v7.widget.RecyclerView.getChildViewHolderInt(RecyclerView.java:3411) at android.support.v7.widget.RecyclerView.getChildLayoutPosition(RecyclerView.java:3445) at com.example.android.feastappv2.feastapp.Friends.FriendFragment$ContactViewHolder.onClick(FriendFragment.java:73) at android.view.View.performClick(View.java:5254) at android.view.View$PerformClick.run(View.java:21173) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:6840) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)

问题的线是在：

@Override public void onClick(View view) { int itemPosition = mRecyclerView.getChildLayoutPosition(view); Toast.makeText(getContext(), "Position is: " + String.valueOf(itemPosition), Toast.LENGTH_LONG).show(); }

在我的班级内：

public class FriendFragment extends Fragment { RecyclerView mRecyclerView; ArrayList<Friend> mContacts; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.recycler_layout, container, false); mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view_layout); mRecyclerView.setHasFixedSize(true); mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); mContacts = FriendProvider.getInstance(getActivity()).getFriends(); mRecyclerView.setAdapter(new ContactAdapter(mContacts)); return view; } // Inner Class private class ContactViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ private final TextView mName; private final TextView mNumber; private Friend mContact; public ContactViewHolder(View itemView) { super(itemView); mName = (TextView) itemView.findViewById(R.id.tv_name); mNumber = (TextView) itemView.findViewById(R.id.tv_number); mName.setOnClickListener(this); } public void bindContact(Friend contact){ mContact = contact; mName.setText(contact.getFirstName().toString() + " " + contact.getLastName()); mNumber.setText(contact.getFriendChannelID().toString()); } @Override public void onClick(View view) { int itemPosition = mRecyclerView.getChildLayoutPosition(view); Toast.makeText(getContext(), "Position is: " + String.valueOf(itemPosition), Toast.LENGTH_LONG).show(); } } class ContactAdapter extends RecyclerView.Adapter<ContactViewHolder> { ArrayList<Friend> contactList; ContactAdapter(ArrayList<Friend> object){ this.contactList = object; } @Override public ContactViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()) .inflate(R.layout.rv_item, parent, false); return new ContactViewHolder(view); } @Override public void onBindViewHolder(ContactViewHolder holder, int position) { Friend contact = contactList.get(position); holder.bindContact(contact); } @Override public int getItemCount() { return contactList.size(); } } }

I am attempting to implement a onClickListener to allow users to click on the RecyclerView list of their friends. However, upon clicking the user list item, it simply returns the error:

01-18 20:39:37.317 3413-3413/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.android.feastappv2, PID: 3413 java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.support.v7.widget.RecyclerView$LayoutParams at android.support.v7.widget.RecyclerView.getChildViewHolderInt(RecyclerView.java:3411) at android.support.v7.widget.RecyclerView.getChildLayoutPosition(RecyclerView.java:3445) at com.example.android.feastappv2.feastapp.Friends.FriendFragment$ContactViewHolder.onClick(FriendFragment.java:73) at android.view.View.performClick(View.java:5254) at android.view.View$PerformClick.run(View.java:21173) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:6840) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)

The line of issue is within:

@Override public void onClick(View view) { int itemPosition = mRecyclerView.getChildLayoutPosition(view); Toast.makeText(getContext(), "Position is: " + String.valueOf(itemPosition), Toast.LENGTH_LONG).show(); }

within my class:

public class FriendFragment extends Fragment { RecyclerView mRecyclerView; ArrayList<Friend> mContacts; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.recycler_layout, container, false); mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view_layout); mRecyclerView.setHasFixedSize(true); mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); mContacts = FriendProvider.getInstance(getActivity()).getFriends(); mRecyclerView.setAdapter(new ContactAdapter(mContacts)); return view; } // Inner Class private class ContactViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ private final TextView mName; private final TextView mNumber; private Friend mContact; public ContactViewHolder(View itemView) { super(itemView); mName = (TextView) itemView.findViewById(R.id.tv_name); mNumber = (TextView) itemView.findViewById(R.id.tv_number); mName.setOnClickListener(this); } public void bindContact(Friend contact){ mContact = contact; mName.setText(contact.getFirstName().toString() + " " + contact.getLastName()); mNumber.setText(contact.getFriendChannelID().toString()); } @Override public void onClick(View view) { int itemPosition = mRecyclerView.getChildLayoutPosition(view); Toast.makeText(getContext(), "Position is: " + String.valueOf(itemPosition), Toast.LENGTH_LONG).show(); } } class ContactAdapter extends RecyclerView.Adapter<ContactViewHolder> { ArrayList<Friend> contactList; ContactAdapter(ArrayList<Friend> object){ this.contactList = object; } @Override public ContactViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()) .inflate(R.layout.rv_item, parent, false); return new ContactViewHolder(view); } @Override public void onBindViewHolder(ContactViewHolder holder, int position) { Friend contact = contactList.get(position); holder.bindContact(contact); } @Override public int getItemCount() { return contactList.size(); } } }