我正在尝试显示将从DB检索的数据。从数据库加载数据工作正常，但在用户从数据库中搜索第二个数据后点击它时，recyclelerview中的数据将被触发两次。
我的片段类显示recyclerview
public class UserGroupUserListFragment extends Fragment {
private final static String TAG_USER_GROUP_LIST_FRAGMENT = "UserGroupListFragment";
private final static String TAG_USER_GROUP_USER_LIST_FRAGMENT = "UserGroupUserListFragment";
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private final Response.ErrorListener onPostsSearchUserGroupUserError = new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(ConsDef.TAG_ERROR_SEARCH_USER_GROUP_USER, error.toString());
}
};
private View view;
private RecyclerView recyclerView = null;
private UserGroupUser1ListAdapter listAdapter = null;
private boolean shouldAdd = false;
private final Response.Listener<String> onPostsSearchUserGroupUserLoaded = new Response.Listener<String>() {
@Override
public void onResponse(String response) {
List<UserBean> list = ConnectionUtil.getInstance().getResponseList(ConsDef.MODULE_TITLE_USER_GROUP_USER, response);
if (list != null) {
if (!list.isEmpty()) {
addGroupUser(list);
} else {
NotificationUtil.getInstance().showNoInfo(ConsDef.NO_USER, getContext());
}
} else {
NotificationUtil.getInstance().showExceptionNotification(getContext());
}
}
};
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public UserGroupUserListFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment UserGroupUserListFragment.
*/
// TODO: Rename and change types and number of parameters
public static UserGroupUserListFragment newInstance(String param1, String param2) {
UserGroupUserListFragment fragment = new UserGroupUserListFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.user_group_user_list_fragment, container, false);
init();
return view;
}
private void init()
{
updateUI();
}
private void updateUI() {
Handler mHandler = new Handler();
try {
mHandler.post(new Runnable() {
@Override
public void run() {
final Button addBtn = view.findViewById(R.id.searchUserGroupUserBtn);
addBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
popupSearchDialog(v);
}
});
searchUserGroupUser(((UserGroupBean) MemoryUtil.getInstance().getObjectInMemory()).getUserGroupID());
}
});
} catch (Exception ex) {
Log.e(ConsDef.TAG_ERROR_SEARCH_USER_GROUP_USER, ex.toString());
}
}
private void popupSearchDialog(View view)
{
try
{
AlertDialog.Builder alertDialog = new AlertDialog.Builder(getActivity());
alertDialog.setTitle(R.string.search_group_user);
alertDialog.setMessage(R.string.user_assigned_to_group);
final EditText input = new EditText(getContext());
alertDialog.setView(input);
alertDialog.setPositiveButton(R.string.search, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
String value = input.getText().toString();
if(value.length() > 0)
{
searchFilterUserGroupUser(value);
}
else
{
NotificationUtil.getInstance().showFillInData(ConsDef.FILL_USERNAME, getContext());
}
}
});
alertDialog.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog dialog = alertDialog.create();
dialog.show();
}
catch (Exception ex)
{
Log.e(ConsDef.TAG_ERROR_SEARCH_USER_GROUP_USER, ex.toString());
ex.printStackTrace();
}
}
private void searchFilterUserGroupUser(String username)
{
try {
String connectionString = ConnectionUtil.getInstance().getWebConnectionWithParam(ConsDef.MODULE_TITLE_USER_GROUP_USER, ConsDef.SERVICE_METHOD_NAME_SEARCH_FILTER_USER_GROUP_USER, username);
StringRequest request = new StringRequest(Request.Method.GET, connectionString, onPostsSearchUserGroupUserLoaded, onPostsSearchUserGroupUserError);
Log.i(ConsDef.TAG_DEBUG_SEARCH_USER_GROUP_USER, request.toString());
VolleyConnection.getInstance().addRequest(getContext(), request, ConsDef.SEARCH_EVENT_CODE, ConsDef.SEARCH_USER_GROUP);
} catch (Exception ex) {
Log.e(ConsDef.TAG_ERROR_SEARCH_USER_GROUP_USER, ex.toString());
}
}
private void searchUserGroupUser(int userGroupID) {
try {
String connectionString = ConnectionUtil.getInstance().getWebConnectionWithParam(ConsDef.MODULE_TITLE_USER_GROUP_USER, ConsDef.SERVICE_METHOD_NAME_SEARCH_USER_GROUP_USER, String.valueOf(userGroupID));
StringRequest request = new StringRequest(Request.Method.GET, connectionString, onPostsSearchUserGroupUserLoaded, onPostsSearchUserGroupUserError);
Log.i(ConsDef.TAG_DEBUG_SEARCH_USER_GROUP_USER, request.toString());
VolleyConnection.getInstance().addRequest(getContext(), request, ConsDef.SEARCH_EVENT_CODE, ConsDef.SEARCH_USER_GROUP);
} catch (Exception ex) {
Log.e(ConsDef.TAG_ERROR_SEARCH_USER_GROUP_USER, ex.toString());
}
}
private void addGroupUser(List<UserBean> list) {
try {
if(listAdapter != null
&& recyclerView != null)
{
int oldListSize = listAdapter.getItemCount();
listAdapter.clear();
listAdapter.notifyItemRangeChanged(0, oldListSize);
recyclerView.removeView(view);
recyclerView.setAdapter(null);
recyclerView.setLayoutManager(null);
recyclerView.setItemAnimator(null);
recyclerView.removeItemDecoration(null);
recyclerView.setHasFixedSize(false);
recyclerView.removeOnItemTouchListener(null);
listAdapter.getList().addAll(list);
listAdapter.notifyDataSetChanged();
}
else
{
recyclerView = (RecyclerView) view.findViewById(R.id.userGroupUserRecyclerView);
listAdapter = new UserGroupUser1ListAdapter(list);
listAdapter.notifyDataSetChanged();
}
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new DividerItemDecoration(this.getContext(), LinearLayoutManager.VERTICAL));
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(listAdapter);
recyclerView.addOnItemTouchListener(new RecyclerUserGroupUserTouchListener(this.getContext(), recyclerView, new RecyclerUserGroupUserTouchListener.ClickListener() {
@Override
public void onClick(View view, int position) {
UserBean userBean = (UserBean) list.get(position);
userBean.setIsUpdate(true);
System.out.println("position : " + position);
System.out.println("userID : " + userBean.getUserID());
System.out.println("email : " + userBean.getEmail());
selectGroupUser(list, position);
}
@Override
public void onLongClick(View view, int position) {
}
}));
} catch (Exception ex) {
Log.e(ConsDef.TAG_ERROR_SEARCH_USER_GROUP_USER, ex.toString());
ex.printStackTrace();
}
}
private void selectGroupUser(List<UserBean> list, int position)
{
UserGroupUserBean userGroupUserBean = null;
try
{
UserBean userBean = (UserBean) list.get(position);
userBean.setIsUpdate(true);
/*
System.out.println("userID : " + userBean.getUserID());
System.out.println("username : " + userBean.getUsername());
System.out.println("position : " + position);
*/
if(userBean.getShouldBeAssignedToGroup()){
UserGroupBean userGroupBean = (UserGroupBean) MemoryUtil.getInstance().getObjectInMemory();
userGroupUserBean = new UserGroupUserBean();
userGroupUserBean.setUserGroupID(userGroupBean.getUserGroupID());
userGroupUserBean.setUserID(userBean.getUserID());
userGroupUserBean.setUsername(userBean.getUsername());
userGroupUserBean.setPasswd(userBean.getPasswd());
userGroupUserBean.setName(userBean.getName());
userGroupUserBean.setContactNumber(userBean.getContactNumber());
userGroupUserBean.setEmail(userBean.getEmail());
userGroupUserBean.setIsUpdate(true);
MemoryUtil.getInstance().setObjectInMemory(userGroupUserBean);
}
else
{
MemoryUtil.getInstance().setObjectInMemory(userBean);
}
getFragmentManager().beginTransaction().replace(R.id.content_frame, new UserGroupUserRegistrationFragment()).addToBackStack(TAG_USER_GROUP_USER_LIST_FRAGMENT).commit();
}
catch (Exception ex)
{
Log.e(ConsDef.TAG_ERROR_SEARCH_USER_GROUP_USER, ex.toString());
ex.printStackTrace();
}
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
getFragmentManager().beginTransaction().replace(R.id.content_frame, new UserGroupListFragment()).addToBackStack(TAG_USER_GROUP_LIST_FRAGMENT).commit();
}`
我的ListAdapter
public class UserGroupUser1ListAdapter extends RecyclerView.Adapter<UserGroupUser1ListAdapter.MyUserGroupUserHolder> {
private List<UserBean> list;
public UserGroupUser1ListAdapter(List<UserBean> list) {
this.list = list;
}
@Override
public MyUserGroupUserHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.user_group_user_list_row, parent, false);
return new MyUserGroupUserHolder(itemView);
}
@Override
public void onBindViewHolder(MyUserGroupUserHolder holder, int position) {
UserBean userBean = null;
StringBuilder stringBuilder = null;
try
{
userBean = this.list.get(position);
stringBuilder = new StringBuilder();
stringBuilder.append(userBean.getName());
stringBuilder.append("\n");
stringBuilder.append(userBean.getContactNumber());
stringBuilder.append("\n");
stringBuilder.append(userBean.getEmail());
stringBuilder.append("\n");
stringBuilder.append(userBean.getRoleBean().getRoleName());
holder.username.setText(userBean.getUsername());
holder.userInfo.setText(stringBuilder.toString());
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
@Override
public int getItemCount() {
return this.list.size();
}
public void clear() {
this.list.clear();
}
public List<UserBean> getList() {
return this.list;
}
public void restoreUserGroupUser(UserBean userBean, int position) {
this.list.add(position, userBean);
// notify item added by position
notifyItemInserted(position);
}
public class MyUserGroupUserHolder extends RecyclerView.ViewHolder {
public TextView username, userInfo;
public MyUserGroupUserHolder(View view) {
super(view);
username = (TextView) view.findViewById(R.id.userGroupUserUsernameRow);
userInfo = (TextView) view.findViewById(R.id.userGroupUserInfoRow);
}
}
}
user_group_user_list_row.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/selectableItemBackground"
android:clickable="true"
android:focusable="true"
android:orientation="vertical"
android:paddingBottom="@dimen/row_padding_vertical"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/row_padding_vertical">
<TextView
android:id="@+id/userGroupUserUsernameRow"
android:layout_width="150sp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="20dp"
android:textColor="@color/user_group_username"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:id="@+id/userGroupUserInfoRow"
android:layout_width="200sp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="20sp"
android:layout_toEndOf="@id/userGroupUserUsernameRow"
android:textColor="@color/user_group_user_info"
android:textSize="16sp"
android:textStyle="bold"/>
</RelativeLayout>
user_group_user_list_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="5dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".userEvent.UserGroupUserListFragment">>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<EditText
android:id="@+id/propertyBlankText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toStartOf="@+id/addNewPropertyBtn"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
android:visibility="invisible" />
<Button
android:id="@+id/searchUserGroupUserBtn"
android:layout_width="25dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:background="?android:attr/selectableItemBackground"
android:drawableLeft="@drawable/action_search"/>
</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/userGroupUserRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />