删除项目时，RecyclerView显示不稳定。Android Studio和云Firestore
我有一个“删除项目”按钮放在“回收者”视图中的“卡片”视图中。当我按delete键时，该项似乎会短暂地重新创建其自身，然后消失。但是，当单击out然后返回到recyclerView活动时，该项在视图中重新创建了自己，但在数据库中没有。我想问题一定在deleteButton onClickListener中，但我似乎找不到解决问题的方法……任何建议都会很好。我已经包括了回收器适配器代码和显示cardView的活动代码。还有xml，以防它与可以在那里设置的onClick方法有关 UserMenuListAdapter.java删除项目时，RecyclerView显示不稳定。Android Studio和云Firestore,android,android-recyclerview,google-cloud-firestore,Android,Android Recyclerview,Google Cloud Firestore,我有一个“删除项目”按钮放在“回收者”视图中的“卡片”视图中。当我按delete键时，该项似乎会短暂地重新创建其自身，然后消失。但是，当单击out然后返回到recyclerView活动时，该项在视图中重新创建了自己，但在数据库中没有。我想问题一定在deleteButton onClickListener中，但我似乎找不到解决问题的方法……任何建议都会很好。我已经包括了回收器适配器代码和显示cardView的活动代码。还有xml，以防它与可以在那里设置的onClick方法有关 UserMenuLi
import static com.melcolton.bite.UsersMenuActivity.finalId;
public class UserMenuListAdapter extends RecyclerView.Adapter<UserMenuListAdapter.ViewHolder> implements View.OnClickListener {
private static final String TAG = "Adapter Log";
private View.OnClickListener myClickListener;
private FirebaseFirestore fbFirestore;
private FirebaseAuth fbAuth;
public String fbUserId;
public List<UserMenu> userMenu;
public Context context;
public UserMenuListAdapter(Context context, List<UserMenu> userMenu, View.OnClickListener myClickListener) {
this.myClickListener = myClickListener;
this.userMenu = userMenu ;
this.context = context;
}
@NonNull
@Override
public UserMenuListAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
Context context = parent.getContext();
View menuView = LayoutInflater.from( context ).inflate( R.layout.item_confirm_list_element, parent, false );
return new ViewHolder( menuView, myClickListener );
}
@Override
public void onBindViewHolder(@NonNull UserMenuListAdapter.ViewHolder holder, int position) {
fbAuth = FirebaseAuth.getInstance();
fbFirestore = FirebaseFirestore.getInstance();
fbUserId = fbAuth.getCurrentUser().getUid();
if (holder instanceof ViewHolder) {
ViewHolder viewHolder = holder;
holder.userMenuName.setText( userMenu.get( position ).getItemName() );
holder.userMenuDesc.setText( userMenu.get( position ).getItemDesc() );
holder.userMenuCals.setText( userMenu.get( position ).getItemCals().toString() );
holder.userMenuCost.setText( userMenu.get( position ).getItemCost().toString() );
holder.deleteButton.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText( context, "Removed", Toast.LENGTH_SHORT ).show();
fbFirestore.collection( "AppUsers" ).document(fbUserId).collection( "UserMenu" ).document(finalId)
.delete().addOnSuccessListener( new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
userMenu.remove( position );
notifyItemRemoved( position );
notifyItemRangeChanged( position, userMenu.size() );
notifyDataSetChanged();
//holder.menuView.setVisibility( View.GONE );
}
} );
}
});
}
}
@Override
public int getItemCount() {
return userMenu.size();
}
public void onEvent (QuerySnapshot queryDocumentSnapshots, FirebaseFirestoreException e) {
if (e !=null) {
Log.w( TAG, "onEvent error: ",e );
onError (e);
}
}
private void onError(FirebaseFirestoreException e) {
Log.w( TAG, "onEvent error: ",e );
}
@Override
public void onClick(View v) {
}
public class ViewHolder extends RecyclerView.ViewHolder {
public CardView userMenuCardView;
public TextView userMenuName;
public TextView userMenuDesc;
public TextView userMenuCals;
public TextView userMenuCost;
public Button deleteButton;
View menuView;
public ViewHolder(View itemView, View.OnClickListener myClickListener) {
super( itemView );
itemView.setOnClickListener( myClickListener );
menuView = itemView;
userMenuCardView = menuView.findViewById( R.id.user_menu_cardview );
userMenuName = menuView.findViewById( R.id.txt_cart_item_name );
userMenuDesc = menuView.findViewById( R.id.txt_cart_item_desc );
userMenuCals = menuView.findViewById( R.id.txt_cart_item_cals );
userMenuCost = menuView.findViewById( R.id.txt_cart_item_cost );
deleteButton = menuView.findViewById( R.id.remove_button );
}
}
}
import static com.melcolton.bite.ChooseRestaurant.valFromAct1;
public class UsersMenuActivity extends AppCompatActivity {
private static final String TAG = "UserMenuActivity";
public static String finalId;
public Context umContext;
public Button myButton;
public static int totalCalsSet;
public static double totalCostSet;
public TextView caloriesUsed;
public String toCalsUsed;
Toolbar menuToolbar;
private FirebaseFirestore umFirestore;
private FirebaseAuth umFirebaseAuth;
private FirebaseAuth mAuth;
private RecyclerView umRecyclerView;
private List<UserMenu> userMenu;
private View.OnClickListener umClickListener;
private UserMenuListAdapter userMenuListAdapter;
private String getUserId;
private TextView passedCalContent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_users_menu );
menuToolbar = findViewById( R.id.menu_toolbar );
setSupportActionBar( menuToolbar );
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled( false );
getSupportActionBar().setDisplayShowHomeEnabled( false );
}
myButton = findViewById( R.id.remove_button );
caloriesUsed = findViewById( R.id.users_menu_calories_used );
toCalsUsed = Integer.toString( totalCalsSet );
caloriesUsed.setText( toCalsUsed );
userMenu = new ArrayList<>();
userMenuListAdapter = new UserMenuListAdapter( getApplicationContext(), userMenu, umClickListener );
umRecyclerView = (RecyclerView) findViewById( R.id.user_menu_recycler_view );
umRecyclerView.setHasFixedSize( true );
umRecyclerView.setLayoutManager( new LinearLayoutManager( this ) );
umRecyclerView.setAdapter( userMenuListAdapter );
passedCalContent = findViewById( R.id.users_menu_calories_set );
passedCalContent.setText( valFromAct1 );
umFirestore = FirebaseFirestore.getInstance();
umFirebaseAuth = FirebaseAuth.getInstance();
getUserId = Objects.requireNonNull( umFirebaseAuth.getCurrentUser() ).getUid();
CollectionReference userMenuRef = umFirestore.collection( "AppUsers" )
.document( getUserId )
.collection( "UserMenu" );
userMenuRef.limit( 100 ).addSnapshotListener( (documentSnapshots, e) -> {
if (e != null) {
Log.d( TAG, "Error: " + e.getMessage() );
}
assert documentSnapshots != null;
for (DocumentChange doc : Objects.requireNonNull( documentSnapshots ).getDocumentChanges()) {
UserMenu menu = doc.getDocument().toObject( UserMenu.class ).withId( doc.getDocument().getId() );
Log.d( TAG, doc.getDocument().getId() + " => " + doc.getDocument() );
finalId = doc.getDocument().getId();
userMenu.add( menu );
userMenuListAdapter.notifyDataSetChanged();
}
} );
//Method here to calculate the total cals value to show in header.
userMenuRef.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
int totalCals = 0;
for (QueryDocumentSnapshot document : task.getResult()) {
double itemCals = document.getDouble("itemCals");
totalCals = (int) (totalCals + itemCals);
}
Log.d("TAG", String.valueOf(totalCals));
totalCalsSet = totalCals;
}
}
});
//Calculates the total cost of the menu.
userMenuRef.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
double totalCost = 0;
for (QueryDocumentSnapshot document : task.getResult()) {
double itemCost = document.getDouble("itemCost");
totalCost = totalCost + itemCost;
}
Log.d("TAG", String.valueOf(totalCost));
totalCostSet = totalCost;
}
}
});
}
//ACTION BAR
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate( R.menu.main_menu, menu );
return true;
}
@Override
public boolean onOptionsItemSelected(android.view.MenuItem item) {
switch (item.getItemId()) {
case R.id.action_logout_button:
logout();
return true;
case R.id.action_settings_button:
Intent settingsIntent = new Intent( UsersMenuActivity.this, AccSetupActivity.class );
startActivity( settingsIntent );
return true;
case R.id.about_info:
Intent aboutIntent = new Intent( UsersMenuActivity.this, DisclaimerActivity.class );
startActivity( aboutIntent );
return true;
default:
return false;
}
}
private void sendToLogin() {
Intent loginIntent = new Intent( UsersMenuActivity.this, LogInActivity.class );
startActivity( loginIntent );
}
private void logout() {
mAuth.signOut();
sendToLogin();
finish();
}
}
import static com.melcolton.bite.UsersMenuActivity.finalId；
公共类UserMenuListAdapter扩展了RecyclerView。适配器实现了View.OnClickListener{
私有静态最终字符串TAG=“适配器日志”；
private View.OnClickListener myClickListener；
私人FirebaseFirestore fbFirestore；
私有FirebaseAuth fbAuth；
公共字符串用户ID；
公共列表用户菜单；
公共语境；
public UserMenuListAdapter（上下文上下文、列表用户菜单、View.OnClickListener myClickListener）{
this.myClickListener=myClickListener；
this.userMenu=userMenu；
this.context=上下文；
}
@非空
@凌驾
public UserMenuListAdapter.ViewHolder onCreateViewHolder（@NonNull ViewGroup父级，int viewType）{
Context=parent.getContext（）；
View menuView=LayoutInflater.from（context）.充气（R.layout.item\u confirm\u list\u元素，父元素，false）；
返回新的ViewHolder（menuView、myClickListener）；
}
@凌驾
public void onBindViewHolder（@NonNull UserMenuListAdapter.ViewHolder，int位置）{
fbAuth=FirebaseAuth.getInstance（）；
fbFirestore=FirebaseFirestore.getInstance（）；
fbUserId=fbAuth.getCurrentUser（）.getUid（）；
if（视图保持架的保持架实例）{
ViewHolder-ViewHolder=holder；
holder.userMenuName.setText（userMenu.get（position.getItemName（））；
holder.userMenuDesc.setText（userMenu.get（position.getItemDesc（））；
holder.userMenuCals.setText（userMenu.get（position.getItemCals（）.toString（））；
holder.userMenuCost.setText（userMenu.get（position.getItemCost（）.toString（））；
holder.deleteButton.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
Toast.makeText（上下文“已删除”，Toast.LENGTH_SHORT）.show（）；
fbFirestore.collection（“AppUsers”）.document（fbUserId）。collection（“UserMenu”）.document（finalId）
.delete（）.addOnSuccessListener（新的OnSuccessListener（））{
@凌驾
成功时公开作废（作废避免）{
用户菜单。删除（位置）；
已移除（位置）的项目；
notifyItemRangeChanged（位置，userMenu.size（））；
notifyDataSetChanged（）；
//holder.menuView.setVisibility（View.GONE）；
}
} );
}
});
}
}
@凌驾
public int getItemCount（）{
返回userMenu.size（）；
}
public void OneEvent（QuerySnapshot queryDocumentSnapshots，FirebaseFirestoreException e）{
如果（e！=null）{
Log.w（标记“onEvent错误：”，e）；
onError（e）；
}
}
私有void onError（FireBaseFireStore例外e）{
Log.w（标记“onEvent错误：”，e）；
}
@凌驾
公共void onClick（视图v）{
}
公共类ViewHolder扩展了RecyclerView.ViewHolder{
公共CardView用户MenuCardView；
公共文本视图用户菜单名；
公共文本视图用户菜单；
公共文本视图用户菜单；
公共文本视图用户菜单成本；
公共按钮删除按钮；
查看菜单视图；
公共视图持有者（视图项视图、视图.OnClickListener myClickListener）{
超级（项目视图）；
setOnClickListener（myClickListener）；
menuView=itemView；
userMenuCardView=menuView.findViewById（R.id.user\u菜单\u cardview）；
userMenuName=menuView.findviewbyd（R.id.txt\u cart\u item\u name）；
userMenuDesc=menuView.findviewbyd（R.id.txt\u cart\u item\u desc）；
userMenuCals=menuView.findviewbyd（R.id.txt\u cart\u item\u cals）；
userMenuCost=menuView.findviewbyd（R.id.txt\u cart\u item\u cost）；
deleteButton=menuView.findViewById（R.id.remove_按钮）；
}
}
}
import static com.melcolton.bite.UsersMenuActivity.finalId;
public class UserMenuListAdapter extends RecyclerView.Adapter<UserMenuListAdapter.ViewHolder> implements View.OnClickListener {
private static final String TAG = "Adapter Log";
private View.OnClickListener myClickListener;
private FirebaseFirestore fbFirestore;
private FirebaseAuth fbAuth;
public String fbUserId;
public List<UserMenu> userMenu;
public Context context;
public UserMenuListAdapter(Context context, List<UserMenu> userMenu, View.OnClickListener myClickListener) {
this.myClickListener = myClickListener;
this.userMenu = userMenu ;
this.context = context;
}
@NonNull
@Override
public UserMenuListAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
Context context = parent.getContext();
View menuView = LayoutInflater.from( context ).inflate( R.layout.item_confirm_list_element, parent, false );
return new ViewHolder( menuView, myClickListener );
}
@Override
public void onBindViewHolder(@NonNull UserMenuListAdapter.ViewHolder holder, int position) {
fbAuth = FirebaseAuth.getInstance();
fbFirestore = FirebaseFirestore.getInstance();
fbUserId = fbAuth.getCurrentUser().getUid();
if (holder instanceof ViewHolder) {
ViewHolder viewHolder = holder;
holder.userMenuName.setText( userMenu.get( position ).getItemName() );
holder.userMenuDesc.setText( userMenu.get( position ).getItemDesc() );
holder.userMenuCals.setText( userMenu.get( position ).getItemCals().toString() );
holder.userMenuCost.setText( userMenu.get( position ).getItemCost().toString() );
holder.deleteButton.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText( context, "Removed", Toast.LENGTH_SHORT ).show();
fbFirestore.collection( "AppUsers" ).document(fbUserId).collection( "UserMenu" ).document(finalId)
.delete().addOnSuccessListener( new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
userMenu.remove( position );
notifyItemRemoved( position );
notifyItemRangeChanged( position, userMenu.size() );
notifyDataSetChanged();
//holder.menuView.setVisibility( View.GONE );
}
} );
}
});
}
}
@Override
public int getItemCount() {
return userMenu.size();
}
public void onEvent (QuerySnapshot queryDocumentSnapshots, FirebaseFirestoreException e) {
if (e !=null) {
Log.w( TAG, "onEvent error: ",e );
onError (e);
}
}
private void onError(FirebaseFirestoreException e) {
Log.w( TAG, "onEvent error: ",e );
}
@Override
public void onClick(View v) {
}
public class ViewHolder extends RecyclerView.ViewHolder {
public CardView userMenuCardView;
public TextView userMenuName;
public TextView userMenuDesc;
public TextView userMenuCals;
public TextView userMenuCost;
public Button deleteButton;
View menuView;
public ViewHolder(View itemView, View.OnClickListener myClickListener) {
super( itemView );
itemView.setOnClickListener( myClickListener );
menuView = itemView;
userMenuCardView = menuView.findViewById( R.id.user_menu_cardview );
userMenuName = menuView.findViewById( R.id.txt_cart_item_name );
userMenuDesc = menuView.findViewById( R.id.txt_cart_item_desc );
userMenuCals = menuView.findViewById( R.id.txt_cart_item_cals );
userMenuCost = menuView.findViewById( R.id.txt_cart_item_cost );
deleteButton = menuView.findViewById( R.id.remove_button );
}
}
}
import static com.melcolton.bite.ChooseRestaurant.valFromAct1;
public class UsersMenuActivity extends AppCompatActivity {
private static final String TAG = "UserMenuActivity";
public static String finalId;
public Context umContext;
public Button myButton;
public static int totalCalsSet;
public static double totalCostSet;
public TextView caloriesUsed;
public String toCalsUsed;
Toolbar menuToolbar;
private FirebaseFirestore umFirestore;
private FirebaseAuth umFirebaseAuth;
private FirebaseAuth mAuth;
private RecyclerView umRecyclerView;
private List<UserMenu> userMenu;
private View.OnClickListener umClickListener;
private UserMenuListAdapter userMenuListAdapter;
private String getUserId;
private TextView passedCalContent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_users_menu );
menuToolbar = findViewById( R.id.menu_toolbar );
setSupportActionBar( menuToolbar );
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled( false );
getSupportActionBar().setDisplayShowHomeEnabled( false );
}
myButton = findViewById( R.id.remove_button );
caloriesUsed = findViewById( R.id.users_menu_calories_used );
toCalsUsed = Integer.toString( totalCalsSet );
caloriesUsed.setText( toCalsUsed );
userMenu = new ArrayList<>();
userMenuListAdapter = new UserMenuListAdapter( getApplicationContext(), userMenu, umClickListener );
umRecyclerView = (RecyclerView) findViewById( R.id.user_menu_recycler_view );
umRecyclerView.setHasFixedSize( true );
umRecyclerView.setLayoutManager( new LinearLayoutManager( this ) );
umRecyclerView.setAdapter( userMenuListAdapter );
passedCalContent = findViewById( R.id.users_menu_calories_set );
passedCalContent.setText( valFromAct1 );
umFirestore = FirebaseFirestore.getInstance();
umFirebaseAuth = FirebaseAuth.getInstance();
getUserId = Objects.requireNonNull( umFirebaseAuth.getCurrentUser() ).getUid();
CollectionReference userMenuRef = umFirestore.collection( "AppUsers" )
.document( getUserId )
.collection( "UserMenu" );
userMenuRef.limit( 100 ).addSnapshotListener( (documentSnapshots, e) -> {
if (e != null) {
Log.d( TAG, "Error: " + e.getMessage() );
}
assert documentSnapshots != null;
for (DocumentChange doc : Objects.requireNonNull( documentSnapshots ).getDocumentChanges()) {
UserMenu menu = doc.getDocument().toObject( UserMenu.class ).withId( doc.getDocument().getId() );
Log.d( TAG, doc.getDocument().getId() + " => " + doc.getDocument() );
finalId = doc.getDocument().getId();
userMenu.add( menu );
userMenuListAdapter.notifyDataSetChanged();
}
} );
//Method here to calculate the total cals value to show in header.
userMenuRef.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
int totalCals = 0;
for (QueryDocumentSnapshot document : task.getResult()) {
double itemCals = document.getDouble("itemCals");
totalCals = (int) (totalCals + itemCals);
}
Log.d("TAG", String.valueOf(totalCals));
totalCalsSet = totalCals;
}
}
});
//Calculates the total cost of the menu.
userMenuRef.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
double totalCost = 0;
for (QueryDocumentSnapshot document : task.getResult()) {
double itemCost = document.getDouble("itemCost");
totalCost = totalCost + itemCost;
}
Log.d("TAG", String.valueOf(totalCost));
totalCostSet = totalCost;
}
}
});
}
//ACTION BAR
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate( R.menu.main_menu, menu );
return true;
}
@Override
public boolean onOptionsItemSelected(android.view.MenuItem item) {
switch (item.getItemId()) {
case R.id.action_logout_button:
logout();
return true;
case R.id.action_settings_button:
Intent settingsIntent = new Intent( UsersMenuActivity.this, AccSetupActivity.class );
startActivity( settingsIntent );
return true;
case R.id.about_info:
Intent aboutIntent = new Intent( UsersMenuActivity.this, DisclaimerActivity.class );
startActivity( aboutIntent );
return true;
default:
return false;
}
}
private void sendToLogin() {
Intent loginIntent = new Intent( UsersMenuActivity.this, LogInActivity.class );
startActivity( loginIntent );
}
private void logout() {
mAuth.signOut();
sendToLogin();
finish();
}
}
导入静态com.melcolton.bite.ChooseRestaurant.valFromAct1；
公共类UsersMenuActivity扩展了AppCompatActivity{
私有静态最终字符串标记=“UserMenuActivity”；
公共静态字符串finalId；
公共语境；
公共按钮myButton；
公共静态整数集合；
公共静态双重总成本集；
公共文本查看使用的卡路里；
要使用的公共字符串；
工具栏菜单工具栏；
私人FirebaseFirestore-umFirestore；
私有FirebaseAuth umFirebaseAuth；
私人消防队；
私人RecyclerView umRecyclerView；
私有列表用户菜单；
private View.OnClickListener umClickListener；
私有用户menulistadapter UserMenuListAdapter；
私有字符串getUserId；
私有TextView passedCalContent；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u users\u菜单）；
menuToolbar=findviewbyd（R.id.menu\u工具栏）；
设置支持操作栏（菜单工具栏）；
如果（getSupportActionBar（）！=null）{
getSupportActionBar（）.setDisplayHomeAsUpEnabled（false）；
getSupportActionBar（）.setDisplayShowHomeEnabled（false）；
}
myButton=findViewById（R.id.remove_按钮）；
卡路里使用=findViewById（R.id.users\u menu\u carries\u used）；
toCalsUsed=整数.toString（totalCalsSet）；
使用的热量。setText（使用的热量）；
userMenu=newarraylist
Context context = parent.getContext();
View menuView = LayoutInflater.from( context ).inflate( R.layout.item_confirm_list_element, parent, false );
return new ViewHolder( menuView, myClickListener );