Java 从回收器视图中删除条目时出现问题
这个问题快把我逼疯了。到现在为止，我已经尝试了20种不同的方法。让我们看看这里是否有人能帮我 我正在使用Java 从回收器视图中删除条目时出现问题,java,android,firebase,firebase-realtime-database,android-recyclerview,Java,Android,Firebase,Firebase Realtime Database,Android Recyclerview,这个问题快把我逼疯了。到现在为止，我已经尝试了20种不同的方法。让我们看看这里是否有人能帮我 我正在使用RecyclerView制作一个待办事项列表应用程序，该应用程序将数据存储在Firebase中 该应用程序具有一个TasksActivity，其中所有任务都显示在RecyclerView中。我有一个进入任务创建对话框的按钮。我可以创建任务，它们会出现在RecyclerView（任务活动）中，并在firebase中更新，不会出现任何问题。我可以关闭应用程序，稍后再回来，一切正常，当我加载应用程序
RecyclerViewTasksActivityRecyclerViewRecyclerViewLog.dOnDataChange（）TaskActivityTasksCreationTaskAdapter公共类TasksAdapter扩展了RecyclerView.Adapter{//v1.3添加到ClickListener
语境；
数组列表任务；
数据库参考；
SimpleDataFormat sdf=新的SimpleDataFormat（“EEEE”）；
日期d=新日期（）；
最终字符串dayOfWeek=sdf.format（d）.substring（0,3）；
公共任务适配器（上下文、ArrayList任务）{
this.context=上下文；
这个。任务=任务；
}
公共类MyViewHolder扩展了RecyclerView.ViewHolder{//V1.3添加了实现View.OnClickListener
文本视图任务标题；
文本视图任务日期；
文本视图任务描述；
复选框任务复选框；
ConstraintLayout ConstraintLayout；//添加到更改每个RecyclerView项的背景中。
公共MyViewHolder（@NonNull View itemView）{
超级（项目视图）；
taskTitle=itemView.findViewById（R.id.taskTitle）；
taskDate=itemView.findviewbyd（R.id.taskDate）；
taskDescription=itemView.findViewById（R.id.taskDescription）；
taskCheckBox=itemView.findViewById（R.id.taskCheckBox）；
constraintLayout=（constraintLayout）itemviewbyd（R.id.item\u task\u布局）；
itemView.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
int pos=getAdapterPosition（）；
//if（pos！=RecyclerView.NO_POSITION）{//检查项目是否仍然存在
TaskItems单击DataItem=tasks.get（pos）；
Toast.makeText（v.getContext（），“您单击了”+clickedDataItem.getTaskTitle（），Toast.LENGTH_SHORT）.show（）；
// }
}
});
}
}
@非空
@凌驾
public MyViewHolder onCreateViewHolder（@NonNull ViewGroup parent，int viewType）{//onCreateViewHolder的标准代码
返回新的MyViewHolder（LayoutInflater.from（context）.充气（R.layout.item_task，parent，false））；
}
@凌驾
public void onBindViewHolder（final@NonNull MyViewHolder，final int position）{//对于列表中的每个项，此方法调用一次。
holder.taskTitle.setText（tasks.get（position.getTaskTitle（））；
holder.tasksdescription.setText（tasks.get（position.getTaskDescription（））；
holder.taskDate.setText（tasks.get（position.getTaskDate（））；
holder.taskCheckBox.setChecked（tasks.get（position.isChecked（））；
holder.taskCheckBox.setTag（tasks.get（position.getKey（））；
holder.taskCheckBox.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
FirebaseDatabase=FirebaseDatabase.getInstance（）；
字符串post=（字符串）holder.taskCheckBox.getTag（）；
Toast.makeText（上下文，“这是复选框编号：”+post，Toast.LENGTH_SHORT）.show（）；//工作正常//更改新逻辑
reference=database.getReference（“MotApp”）.child（post）；
布尔checkboxStatus=holder.taskCheckBox.isChecked（）；
Log.d（“Checked”，“onClick:选中的taskcheckbox是”+holder.taskcheckbox.isChecked（））；
TaskItems值=新TaskItems（tasks.get（position）.getKey（），tasks.get（position）.getTaskTitle（），tasks.get（position）.getTaskDate（），tasks.get（position）.getTaskDescription（），checkboxStatus）；
参考。设定值（值）；
Toast.makeText（上下文，“这是属于项“+tasks.get（position）.getTaskTitle（），Toast.LENGTH_LONG）.show（）的复选框）；
}
});
}
@凌驾
public int getItemCount（）{//告诉适配器大小。如果为零，则不会创建任何内容
返回任务。size（）；
}
}
任务创建返回时，需要在任务活动
中重建回收视图
数据；这是因为调用了TasksActivity
的onCreate（）
回调
public class TasksActivity extends AppCompatActivity {
DatabaseReference reference;
RecyclerView myTasks;
ArrayList<TaskItems> myTasksList;
TasksAdapter tasksAdapter;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tasks);
myTasks = findViewById(R.id.my_tasks); // RecyclerView that I defined as part of the layout. This is the id of it
myTasks.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
myTasksList = new ArrayList<>();
Button openCreateTask = findViewById(R.id.openCreateTask);
tasksAdapter = new TasksAdapter(this,myTasksList);
myTasks.setAdapter(tasksAdapter);
new ItemTouchHelper(itemTouchHelper).attachToRecyclerView(myTasks);
openCreateTask.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent_task = new Intent(getApplicationContext(), TasksCreation.class);
startActivity(intent_task);
}
});
reference = FirebaseDatabase.getInstance().getReference().child("MotApp"); // Name of the App in the database .child("MotApp")
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) { // It gets the info from the database
Log.d("data Changed called", "onDataChange: is called");
Log.d("whatever", "onDataChange BEGIN Array of myTasksList size is "+myTasksList.size());
myTasksList.clear(); // Added later to avoid duplication
for(DataSnapshot elements: dataSnapshot.getChildren()){
TaskItems p = elements.getValue(TaskItems.class);
myTasksList.add(p);
}
tasksAdapter.notifyDataSetChanged(); // If this is put outside of onDataChange, it displays a blank list.
Log.d("whatever", "onDataChange END Array of myTasksList size is "+myTasksList.size());
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toast.makeText(getApplicationContext(), "No data", Toast.LENGTH_SHORT).show();
}
});
}
ItemTouchHelper.SimpleCallback itemTouchHelper = new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.RIGHT) {
@Override
public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
Log.d("ARRAY SIZE", "onSwiped BEGIN Array of myTasksList size is "+myTasksList.size());
String key = myTasksList.get(position).getKey();
reference= FirebaseDatabase.getInstance().getReference().child("MotApp").child(key);
Toast.makeText(getApplicationContext(),"This is key "+key,Toast.LENGTH_LONG).show();
reference.removeValue();
myTasksList.remove(position);
tasksAdapter.notifyItemRemoved(position);
Log.d("ARRAY SIZE", "onSwiped END Array of myTasksList size is "+myTasksList.size());
}
};
}
public class TasksCreation extends AppCompatActivity {
DatabaseReference referenceCreation;
ArrayList<String> list;
EditText taskName;
EditText taskDescr;
Button selectDates;
TextView taskDate;
Button createTask;
Button cancel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tasks_creation);
taskName = findViewById(R.id.et_TaskName);
taskDescr = findViewById(R.id.et_TaskDescr);
selectDates = findViewById(R.id.selectDates);
taskDate= findViewById(R.id.tv_Dates);
createTask = findViewById(R.id.createTask);
cancel = findViewById(R.id.cancelButton);
createTask.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!TextUtils.isEmpty(taskName.getText()) && !TextUtils.isEmpty(taskDate.getText())) {
referenceCreation = FirebaseDatabase.getInstance().getReference().child("MotApp").push(); //saves it with custom key created by Firebase
final String key = referenceCreation.getKey();
referenceCreation.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
dataSnapshot.getRef().child("key").setValue(key);
dataSnapshot.getRef().child("taskTitle").setValue(taskName.getText().toString());
dataSnapshot.getRef().child("taskDescription").setValue(taskDescr.getText().toString());
dataSnapshot.getRef().child("taskDate").setValue(taskDate.getText().toString());
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
Intent intent = new Intent(getApplicationContext(), TasksActivity.class);
startActivity(intent);
} else{
Toast.makeText(getApplicationContext(), "You haven't filled all the fields", Toast.LENGTH_SHORT).show();
}
}
});
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), TasksActivity.class);
startActivity(intent);
}
});
selectDates.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
createAlertDialogue();
}
});
}
private void createAlertDialogue(){
list = new ArrayList<String>();
AlertDialog.Builder builder = new AlertDialog.Builder(this,R.style.MyDialogTheme);
builder.setTitle("Select days");
builder.setMultiChoiceItems(R.array.Days, null, new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
String arr[] = getResources().getStringArray(R.array.Days);
if(isChecked){
list.add(arr[which]);
}else if(list.contains(arr[which])){
list.remove(arr[which]);
}
}
});
builder.setPositiveButton("Save", new DialogInterface.OnClickListener() {
String data = "";
@Override
public void onClick(DialogInterface dialog, int which) {
for(String elements: list){
elements = elements.substring(0,3);
data= elements+" "+data;
}
taskDate.setText(data);
}
});
builder.create();
builder.show();
}
}
public class TasksAdapter extends RecyclerView.Adapter<TasksAdapter.MyViewHolder> { // V 1.3 added OnClickListener
Context context;
ArrayList<TaskItems> tasks;
DatabaseReference reference;
SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
Date d = new Date();
final String dayOfTheWeek = sdf.format(d).substring(0,3);
public TasksAdapter(Context context, ArrayList<TaskItems> tasks) {
this.context = context;
this.tasks = tasks;
}
public class MyViewHolder extends RecyclerView.ViewHolder { // V1.3 Added implements View.OnClickListener
TextView taskTitle;
TextView taskDate;
TextView taskDescription;
CheckBox taskCheckBox;
ConstraintLayout constraintLayout; // Added to change background of each RecyclerView item.
public MyViewHolder(@NonNull View itemView) {
super(itemView);
taskTitle = itemView.findViewById(R.id.taskTitle);
taskDate = itemView.findViewById(R.id.taskDate);
taskDescription = itemView.findViewById(R.id.taskDescription);
taskCheckBox = itemView.findViewById(R.id.taskCheckBox);
constraintLayout = (ConstraintLayout) itemView.findViewById(R.id.item_task_layout);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = getAdapterPosition();
// if(pos != RecyclerView.NO_POSITION){//Checks if item still exists
TaskItems clickedDataItem = tasks.get(pos);
Toast.makeText(v.getContext(), "You clicked " + clickedDataItem.getTaskTitle(), Toast.LENGTH_SHORT).show();
// }
}
});
}
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { // standard code for onCreateViewHolder
return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.item_task,parent,false));
}
@Override
public void onBindViewHolder(final @NonNull MyViewHolder holder, final int position) { // This method is called once for each item on the list.
holder.taskTitle.setText(tasks.get(position).getTaskTitle());
holder.taskDescription.setText(tasks.get(position).getTaskDescription());
holder.taskDate.setText(tasks.get(position).getTaskDate());
holder.taskCheckBox.setChecked(tasks.get(position).isChecked());
holder.taskCheckBox.setTag(tasks.get(position).getKey());
holder.taskCheckBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FirebaseDatabase database = FirebaseDatabase.getInstance();
String post = (String) holder.taskCheckBox.getTag();
Toast.makeText(context,"This is checkbox number: "+post,Toast.LENGTH_SHORT).show(); // Working Well. //change for new logic
reference = database.getReference("MotApp").child(post);
boolean checkboxStatus = holder.taskCheckBox.isChecked();
Log.d("Checked", "onClick: The taskcheckbox checked is "+holder.taskCheckBox.isChecked());
TaskItems value = new TaskItems(tasks.get(position).getKey(),tasks.get(position).getTaskTitle(), tasks.get(position).getTaskDate(),tasks.get(position).getTaskDescription(),checkboxStatus);
reference.setValue(value);
Toast.makeText(context,"This is a checkbox belonging to item "+tasks.get(position).getTaskTitle(),Toast.LENGTH_LONG).show();
}
});
}
@Override
public int getItemCount() { //tells the adapter the size . if it's zero then it won't create anything
return tasks.size();
}
}
public class TasksActivity extends AppCompatActivity {
DatabaseReference reference;
RecyclerView myTasks;
ArrayList<TaskItems> myTasksList;
TasksAdapter tasksAdapter;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tasks);
}
@Override
protected void onResume() {
super.onResume();
myTasks = findViewById(R.id.my_tasks); // RecyclerView that I defined as part of the layout. This is the id of it
myTasks.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
myTasksList = new ArrayList<>();
Button openCreateTask = findViewById(R.id.openCreateTask);
tasksAdapter = new TasksAdapter(this,myTasksList);
myTasks.setAdapter(tasksAdapter);
new ItemTouchHelper(itemTouchHelper).attachToRecyclerView(myTasks);
openCreateTask.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent_task = new Intent(getApplicationContext(), TasksCreation.class);
startActivity(intent_task);
}
});
reference = FirebaseDatabase.getInstance().getReference().child("MotApp"); // Name of the App in the database .child("MotApp")
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) { // It gets the info from the database
Log.d("data Changed called", "onDataChange: is called");
Log.d("whatever", "onDataChange BEGIN Array of myTasksList size is "+myTasksList.size());
myTasksList.clear(); // Added later to avoid duplication
for(DataSnapshot elements: dataSnapshot.getChildren()){
TaskItems p = elements.getValue(TaskItems.class);
myTasksList.add(p);
}
tasksAdapter.notifyDataSetChanged(); // If this is put outside of onDataChange, it displays a blank list.
Log.d("whatever", "onDataChange END Array of myTasksList size is "+myTasksList.size());
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toast.makeText(getApplicationContext(), "No data", Toast.LENGTH_SHORT).show();
}
});
}
ItemTouchHelper.SimpleCallback itemTouchHelper = new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.RIGHT) {
@Override
public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
Log.d("ARRAY SIZE", "onSwiped BEGIN Array of myTasksList size is "+myTasksList.size());
String key = myTasksList.get(position).getKey();
reference= FirebaseDatabase.getInstance().getReference().child("MotApp").child(key);
Toast.makeText(getApplicationContext(),"This is key "+key,Toast.LENGTH_LONG).show();
reference.removeValue();
myTasksList.remove(position);
tasksAdapter.notifyItemRemoved(position);
Log.d("ARRAY SIZE", "onSwiped END Array of myTasksList size is "+myTasksList.size());
}
};
}