Я не уверен, что я пропустил, хотя я следовал учебнику, кажется, у меня есть проблема, которую я не мог отследить.
Некоторый фон:
Во-первых, в моем списке изначально нет детей.После того, как пользователь создает группу, приложение также добавляет первого дочернего элемента.первый ребенок - фиктивный, так как в нем нет никаких данных.Метод getChildView (в MyListAdapter), который раздувает представление, имеет 2 случая: случай для первого ребенка и случай для остальных детей.Второй случай на данный момент не имеет значения, так как я еще не определил его.Вернувшись в первом случае, я создал макет с кнопкой, которую я хочу показать в качестве первой строки списка.
Проблема:
В основном,когда я добавляю новую группу, она фактически работает, но я не могу развернуть / свернуть заголовок.
Код: Активность
public class HomeScreen extends AppCompatActivity {
private LinkedHashMap<Integer, WorkoutGroup> mySection = new LinkedHashMap<>();
private ArrayList<WorkoutGroup> workoutList = new ArrayList<>();
private ExpandableListView expandableListView;
private MyListAdapter listAdapter;
//two welcome messages that disappear after the insert of the first Group.
private TextView noWorkoutsYet;
private TextView welcomeTitle;
//A layout that contains the table tabs of the log
private ConstraintLayout tableTabs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home_screen_activity);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Hide the text in the action bar
getSupportActionBar().setDisplayShowTitleEnabled(false);
//get reference to the welcome TextViews
noWorkoutsYet = (TextView)findViewById(R.id.noWorkouts_tv);
welcomeTitle = (TextView)findViewById(R.id.welcome_tv);
//get reference to the table tabs layout
tableTabs = (ConstraintLayout)findViewById(R.id.tableTabs);
//get reference to the ExpandableListView
expandableListView = (ExpandableListView) findViewById(R.id.myList);
//create the adapter by passing your ArrayList data
listAdapter = new MyListAdapter(HomeScreen.this, workoutList);
//check if there is more then one workout in the list
//if so, than update the layout
if(listAdapter.getGroupCount()>0){
setUpdatedView();
}
//attach the adapter to the list
expandableListView.setAdapter(listAdapter);
//expand all Groups
expandAll();
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//get the last workout position and create a new workout
createNewWorkout(listAdapter.getGroupCount());
}
});
//listener for group heading click
//our group listener
expandableListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
Log.d("onGroupClick:", "worked");
parent.expandGroup(groupPosition);
return false;
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds Groups to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_home_screen, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar Group clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void createNewWorkout(int mWorkoutPosition){
//create a dialog that ask the date of the new workout from the user
NewWorkoutGroupFragment newWorkDialog = new NewWorkoutGroupFragment();
newWorkDialog.setStyle(DialogFragment.STYLE_NORMAL, R.style.CustomNewDialogFragment);
newWorkDialog.setmWorkoutPosition(mWorkoutPosition);
newWorkDialog.show(getFragmentManager(), "getDateFragment");
}
//method to expand all groups
private void expandAll() {
int count = listAdapter.getGroupCount();
for (int i = 0; i < count; i++){
expandableListView.expandGroup(i);
}
}
//method to collapse all groups
private void collapseAll() {
int count = listAdapter.getGroupCount();
for (int i = 0; i < count; i++){
expandableListView.collapseGroup(i);
}
}
//method that insert a workout to the list by last workout position and selected date
public void buildWorkout(int mWorkoutPosition, String mDate) {
//check the hash map if the workout group is already exists
WorkoutGroup workoutGroup = mySection.get(mWorkoutPosition);
//in case there is no such workout group, create a new one
if (workoutGroup == null) {
workoutGroup = new WorkoutGroup();
//set new data as a group
workoutGroup.setmWorkoutPosition(Integer.toString(mWorkoutPosition));
workoutGroup.setmDate(mDate);
//put the new workout group inside the hash map
mySection.put(mWorkoutPosition, workoutGroup);
//insert the new workout group to the list
workoutList.add(workoutGroup);
//update the visibility of some view items
setUpdatedView();
//The first child is a dummy item;
//it has only a button that can create a new exercise
ExerciseItem firstChild = new ExerciseItem();
//add it as the first child
addItemToExerciseList(mWorkoutPosition, firstChild);
}else{
Toast.makeText(this, R.string.error_workout_already_exists, Toast.LENGTH_SHORT).show();
}
}
//This method insert an exercise to a list of exercises
public void addItemToExerciseList(int mWorkoutPosition, ExerciseItem child) {
WorkoutGroup workoutGroup = mySection.get(mWorkoutPosition);
ArrayList<ExerciseItem> exerciseList = workoutGroup.getExerciseList();
exerciseList.add(child);
//update the changes
workoutGroup.setExerciseList(exerciseList);
listAdapter.notifyDataSetChanged();
int groupPosition = workoutList.indexOf(workoutGroup);
//collapse all groups
collapseAll();
//expand the group where item was just added
expandableListView.expandGroup(groupPosition);
//set the current group to be selected so that it becomes visible
expandableListView.setSelectedGroup(groupPosition);
}
//update the new look of the screen after adding the first workout
private void setUpdatedView(){
welcomeTitle.setVisibility(View.INVISIBLE);
noWorkoutsYet.setVisibility(View.INVISIBLE);
tableTabs.setVisibility(View.VISIBLE);
}
}
ListAdapter
public class MyListAdapter extends BaseExpandableListAdapter {
private ArrayList<WorkoutGroup> workoutList;
private Context context;
public MyListAdapter(Context context, ArrayList<WorkoutGroup> workoutList) {
this.context = context;
this.workoutList = workoutList;
}
/* Group Methods */
@Override
public View getGroupView(int groupPosition, boolean isLastChild, View view,
ViewGroup parent) {
WorkoutGroup workoutGroup = (WorkoutGroup) getGroup(groupPosition);
if (view == null) {
LayoutInflater inf = (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inf.inflate(R.layout.workout_heading, null);
}
TextView workoutPositionHeader = (TextView) view.findViewById(R.id.heading);
int workoutPositionNum = Integer.valueOf(workoutGroup.getmWorkoutPosition());
String workoutPosition = "#" + workoutPositionNum;
workoutPositionHeader.setText(workoutPosition);
TextView dateHeader = (TextView) view.findViewById(R.id.heading2);
dateHeader.setText(workoutGroup.getmDate().trim());
return view;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public int getGroupCount() {
return workoutList.size();
}
@Override
public Object getGroup(int groupPosition) {
return workoutList.get(groupPosition);
}
/* Child Methods */
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View view, ViewGroup parent) {
ExerciseItem exerciseItem = (ExerciseItem) getChild(groupPosition, childPosition);
if (view == null) {
LayoutInflater infalInflater = (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (childPosition == 0) {
view = infalInflater.inflate(R.layout.button_exercise_row, null);
} else {
view = infalInflater.inflate(R.layout.exercise_row, null);
}
}
return view;
}
@Override
public int getChildrenCount(int groupPosition) {
ArrayList<ExerciseItem> exerciseList =
workoutList.get(groupPosition).getExerciseList();
return exerciseList.size();
}
@Override
public Object getChild(int groupPosition, int childPosition) {
ArrayList<ExerciseItem> exerciseList =
workoutList.get(groupPosition).getExerciseList();
return exerciseList.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
@Override
public boolean hasStableIds() {
return true;
}
}
WorkoutGroup
public class WorkoutGroup {
private String mWorkoutPosition = "";
private String mDate = "";
private ArrayList<ExerciseItem> exerciseList = new ArrayList<ExerciseItem>();
public WorkoutGroup() {
}
public String getmWorkoutPosition() {
return mWorkoutPosition;
}
public void setmWorkoutPosition(String mWorkoutPosition) {
this.mWorkoutPosition = mWorkoutPosition;
}
public String getmDate() {
return mDate;
}
public void setmDate(String mDate) {
this.mDate = mDate;
}
public ArrayList<ExerciseItem> getExerciseList() {
return exerciseList;
}
public void setExerciseList(ArrayList<ExerciseItem> exerciseList) {
this.exerciseList = exerciseList;
}
}