我正在開發一個在 Recycle List View Holder 中顯示數據的 android 應用程序。當我單擊 Recycler View Holder 中的列表項時，應用程序崩潰。public class UserRecyclerAdapterSavedUsers extends RecyclerView.Adapter<UserRecyclerAdapterSavedUsers.UserViewHolder> {private List<User> listUsers;Context mContext;ItemClickListenerLongPressed itemClickListenerLongPressed;public UserRecyclerAdapterSavedUsers(List<User> listUsers) { this.listUsers = listUsers;}@Overridepublic UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(parent.getContext()) .inflate(R.layout.item_user_recycler_second, parent, false); return new UserViewHolder(itemView);}@Overridepublic void onBindViewHolder(UserViewHolder holder, int position) { holder.textViewID.setText(listUsers.get(position).getUserid()); holder.textViewName.setText(listUsers.get(position).getName()); holder.textViewPassword.setText(listUsers.get(position).getPassword()); holder.textViewRole.setText(listUsers.get(position).getRole());}public void setItemClickListenerLongPressed(ItemClickListenerLongPressed itemClickListenerLongPressed){ this.itemClickListenerLongPressed=itemClickListenerLongPressed;}@Overridepublic int getItemCount() { Log.v(UserRecyclerAdapterSavedUsers.class.getSimpleName(),""+listUsers.size()); return listUsers.size();}/** * ViewHolder class */public class UserViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { //public AppCompatTextView ID; public AppCompatTextView textViewID; public AppCompatTextView textViewName; public AppCompatTextView textViewPassword; public AppCompatTextView textViewRole; }}}當我單擊列表項時，它崩潰了，錯誤是由 Toast 引起的。當我刪除 toast 時，由于使用了未單擊的 try catch 項，因此出現錯誤。這是錯誤的圖像。
3 回答
呼喚遠方
TA貢獻1856條經驗 獲得超11個贊
首先將id添加到您的父 LinearLayout 為android:id="@+id/list_view"
然后更新適配器類
public class UserRecyclerAdapterSavedUsers extends RecyclerView.Adapter<UserRecyclerAdapterSavedUsers.UserViewHolder> {
private List<User> listUsers;
Context mContext;
ItemClickListenerLongPressed itemClickListenerLongPressed;
View itemView;
public UserRecyclerAdapterSavedUsers(List<User> listUsers) {
this.listUsers = listUsers;
}
@Override
public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_user_recycler_second, parent, false);
return new UserViewHolder(itemView);
}
@Override
public void onBindViewHolder(UserViewHolder holder, int position) {
holder.textViewID.setText(listUsers.get(position).getUserid());
holder.textViewName.setText(listUsers.get(position).getName());
holder.textViewPassword.setText(listUsers.get(position).getPassword());
holder.textViewRole.setText(listUsers.get(position).getRole());
}
public void setItemClickListenerLongPressed(ItemClickListenerLongPressed itemClickListenerLongPressed){
this.itemClickListenerLongPressed=itemClickListenerLongPressed;
}
@Override
public int getItemCount() {
return listUsers.size();
}
private void displayingAlertDialog() {
//displaying alert dialog box
AlertDialog.Builder builder = new AlertDialog.Builder(itemView.getContext());
builder.setMessage("your toast message here...");
builder.setCancelable(true);
builder.setPositiveButton(
"Ok",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert11 = builder.create();
alert11.show();
}
/**
* ViewHolder class
*/
public class UserViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
//public AppCompatTextView ID;
public AppCompatTextView textViewID;
public AppCompatTextView textViewName;
public AppCompatTextView textViewPassword;
public AppCompatTextView textViewRole;
LinearLayout layout;
public UserViewHolder(View view) {
super(view);
textViewID = (AppCompatTextView) view.findViewById(R.id.textViewID);
textViewName = (AppCompatTextView) view.findViewById(R.id.textViewName);
textViewPassword = (AppCompatTextView) view.findViewById(R.id.textViewPassword);
textViewRole = (AppCompatTextView) view.findViewById(R.id.textViewRole);
layout = view.findViewById(R.id.list_view);
layout.setOnClickListener(this);
}
@Override
public void onClick(View v) {
displayingAlertDialog();
}
}
月關寶盒
TA貢獻1772條經驗 獲得超5個贊
您尚未mContext在適配器類中聲明。在 Adapter 類的構造函數中可能會像這樣改變。
public UserRecyclerAdapterSavedUsers(List<User> listUsers,Context context) {
this.mContext= context;
this.listUsers1 = listUsers;
user= new User();
}
和你必須改變的回收視圖活動類
UserRecyclerAdapterSavedUsers myAdapter = new RecyclerViewAdapter(yourList,this);
守候你守候我
TA貢獻1802條經驗 獲得超10個贊
使用 Recyclerview 項目 click like this click here
然后您可以訪問您的界面activity或fragment然后您可以添加您需要的任何內容。
在里面給予
toast和填充不是正確的編碼方式AlertDialogAdapter
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