问题
I want to implement sections in my list. I have a list of tasks. List has a custom adapter which extends recyclerview swipe adapter as I have implemented swipe gesture to the recyclerview.
So now tasks list is shown together with completed and pending tasks. Each list item has a check box which shows task is completed or pending.
If check box is checked then task is completed and vise versa. Now I want to make two sections in this with header. One For completed tasks and another for pending tasks.
So completed tasks should be shown inside completed section and vise versa. Also if the task is unchecked i.e pending and if user checks the check box then the item should get removed from the pending section and should get added to the completed section and vise versa.
I checked with one library for sections.
https://github.com/afollestad/sectioned-recyclerview
But when I tried to implement the library I got the error that adapter can not extend two classes as I have extended recyclerview swipe library before.
Adapter :
public class IAdapter extends RecyclerSwipeAdapter<IAdapter.ItemViewHolder> {
public ArrayList<Task> items;
Context conext;
public int _mId;
List<Task> itemsPendingRemoval = new ArrayList<>();
public IAdapter(Context context, ArrayList<Task> item) {
this.conext=context;
this.items=item;
}
@Override
public int getItemCount() {
return items.size();
}
public static class ItemViewHolder extends RecyclerView.ViewHolder {
Task task;
CheckBox cb;
SwipeLayout swipeLayout;
TaskTableHelper taskTableHelper;
ItemViewHolder(final View itemView) {
super(itemView);
taskTableHelper= new TaskTableHelper(itemView.getContext());
swipeLayout = (SwipeLayout) itemView.findViewById(R.id.swipe);
cb = (CheckBox) itemView.findViewById(R.id.checkbox);
}
}
@Override
public void onBindViewHolder(final ItemViewHolder itemViewHolder,final int i) {
itemViewHolder.cb.setText(items.get(i).getTitle());
itemViewHolder.task = items.get(i);
int taskId = itemViewHolder.task.getId();
itemViewHolder.task = itemViewHolder.taskTableHelper.getTask(taskId);
int status = itemViewHolder.task.getStatus();
if(status == 0)
{
itemViewHolder.cb.setTextColor(Color.WHITE);
}
else {
itemViewHolder.cb.setChecked(true);
itemViewHolder.cb.setTextColor(Color.parseColor("#B0BEC5"));
}
itemViewHolder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
itemViewHolder.cb.setTextColor(Color.parseColor("#B0BEC5"));
itemViewHolder.task.setStatus(1);
itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);
}
else
{
itemViewHolder.cb.setTextColor(Color.WHITE);
itemViewHolder.task.setStatus(0);
itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);
}
}
});
final Task item = items.get(i);
itemViewHolder.swipeLayout.addDrag(SwipeLayout.DragEdge.Right,itemViewHolder.swipeLayout.findViewById(R.id.bottom_wrapper_2));
itemViewHolder.swipeLayout.setShowMode(SwipeLayout.ShowMode.LayDown);
itemViewHolder.swipeLayout.setOnDoubleClickListener(new SwipeLayout.DoubleClickListener() {
@Override
public void onDoubleClick(SwipeLayout layout, boolean surface) {
Toast.makeText(conext, "DoubleClick", Toast.LENGTH_SHORT).show();
}
});
itemViewHolder.swipeLayout.findViewById(R.id.trash2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mItemManger.removeShownLayouts(itemViewHolder.swipeLayout);
items.remove(i);
notifyItemRemoved(i);
notifyItemRangeChanged(i, items.size());
mItemManger.closeAllItems();
itemViewHolder.taskTableHelper.deleteTask(item);
_mId = item.getAlertId();
cancelNotification();
Toast.makeText(view.getContext(), "Deleted " + itemViewHolder.cb.getText().toString() + "!", Toast.LENGTH_SHORT).show();
}
});
itemViewHolder.swipeLayout.findViewById(R.id.done).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
itemViewHolder.task.setStatus(1);
itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);
itemViewHolder.cb.setChecked(true);
Toast.makeText(conext, "Task Completed.", Toast.LENGTH_SHORT).show();
}
});
itemViewHolder.swipeLayout.getSurfaceView().setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean mEditMode;
int id = item.getId();
int priority = item.getTaskPriority();
String title = item.getTitle();
String alertDate = item.getAlertDate();
String alertTime = item.getAlertTime();
String dueDate = item.getDueDate();
String dueTime = item.getDueTime();
_mId = item.getAlertId();
int listId = item.getList();
mEditMode = true;
Intent i = new Intent(conext, AddTaskActivity.class);
i.putExtra("taskId", id);
i.putExtra("taskTitle", title);
i.putExtra("taskPriority", priority);
i.putExtra("taskAlertTime", alertTime);
i.putExtra("taskAlertDate", alertDate);
i.putExtra("taskDueDate", dueDate);
i.putExtra("taskDueTime", dueTime);
i.putExtra("taskListId", listId);
i.putExtra("EditMode", mEditMode);
i.putExtra("AlertId",_mId);
conext.startActivity(i);
}
});
mItemManger.bindView(itemViewHolder.itemView, i);
}
@Override
public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup,int position) {
View itemView = LayoutInflater.
from(viewGroup.getContext()).
inflate(R.layout.card_layout, viewGroup, false);
return new ItemViewHolder(itemView);
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public void remove(int position) {
Task item = items.get(position);
if (itemsPendingRemoval.contains(item)) {
itemsPendingRemoval.remove(item);
}
if (items.contains(item)) {
items.remove(position);
notifyItemRemoved(position);
}
}
public void cancelNotification()
{
AlarmManager alarmManager = (AlarmManager)conext.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(conext, NotificationReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(conext,_mId, intent, 0);
alarmManager.cancel(pendingIntent);
}
@Override
public int getSwipeLayoutResourceId(int position) {
return R.id.swipe;
}
}
EDIT:
onBindViewHolder method after extending sectionedRecyclerview adapter:
@Override
public void onBindViewHolder(ItemViewHolder itemViewHolder, int section, int i, int absolutePosition) {
itemViewHolder.cb.setText(items.get(i).getTitle());
itemViewHolder.task = items.get(i);
int taskId = itemViewHolder.task.getId();
itemViewHolder.task = itemViewHolder.taskTableHelper.getTask(taskId);
int status = itemViewHolder.task.getStatus();
if(status == 0)
{
itemViewHolder.cb.setTextColor(Color.WHITE);
}
else {
itemViewHolder.cb.setChecked(true);
itemViewHolder.cb.setTextColor(Color.parseColor("#B0BEC5"));
}
itemViewHolder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
itemViewHolder.cb.setTextColor(Color.parseColor("#B0BEC5"));
itemViewHolder.task.setStatus(1);
itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);
}
else
{
itemViewHolder.cb.setTextColor(Color.WHITE);
itemViewHolder.task.setStatus(0);
itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);
}
}
});
final Task item = items.get(i);
itemViewHolder.swipeLayout.addDrag(SwipeLayout.DragEdge.Right,itemViewHolder.swipeLayout.findViewById(R.id.bottom_wrapper_2));
itemViewHolder.swipeLayout.setShowMode(SwipeLayout.ShowMode.LayDown);
itemViewHolder.swipeLayout.setOnDoubleClickListener(new SwipeLayout.DoubleClickListener() {
@Override
public void onDoubleClick(SwipeLayout layout, boolean surface) {
Toast.makeText(conext, "DoubleClick", Toast.LENGTH_SHORT).show();
}
});
itemViewHolder.swipeLayout.findViewById(R.id.trash2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mItemManger.removeShownLayouts(itemViewHolder.swipeLayout);
items.remove(i);
notifyItemRemoved(i);
notifyItemRangeChanged(i, items.size());
mItemManger.closeAllItems();
itemViewHolder.taskTableHelper.deleteTask(item);
_mId = item.getAlertId();
cancelNotification();
Toast.makeText(view.getContext(), "Deleted " + itemViewHolder.cb.getText().toString() + "!", Toast.LENGTH_SHORT).show();
}
});
itemViewHolder.swipeLayout.findViewById(R.id.done).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
itemViewHolder.task.setStatus(1);
itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);
itemViewHolder.cb.setChecked(true);
Toast.makeText(conext, "Task Completed.", Toast.LENGTH_SHORT).show();
}
});
itemViewHolder.swipeLayout.getSurfaceView().setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean mEditMode;
int id = item.getId();
int priority = item.getTaskPriority();
String title = item.getTitle();
String alertDate = item.getAlertDate();
String alertTime = item.getAlertTime();
String dueDate = item.getDueDate();
String dueTime = item.getDueTime();
_mId = item.getAlertId();
int listId = item.getList();
mEditMode = true;
Intent i = new Intent(conext, AddTaskActivity.class);
i.putExtra("taskId", id);
i.putExtra("taskTitle", title);
i.putExtra("taskPriority", priority);
i.putExtra("taskAlertTime", alertTime);
i.putExtra("taskAlertDate", alertDate);
i.putExtra("taskDueDate", dueDate);
i.putExtra("taskDueTime", dueTime);
i.putExtra("taskListId", listId);
i.putExtra("EditMode", mEditMode);
i.putExtra("AlertId",_mId);
conext.startActivity(i);
}
});
mItemManger.bindView(itemViewHolder.itemView, i);
}
How can I do this? Can anyone help with this please?
Thank you..
回答1:
The most simple way to split your recycler view into sections is by using a layout with the header and the item already in place and then changing the visibility if the header is the same.
Layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/tvHeader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:padding="16dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/primary"
android:textStyle="bold"
tools:text="A" />
<TextView
android:id="@+id/tvName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/tvHeader"
android:background="?android:attr/selectableItemBackground"
android:padding="16dp"
android:textAppearance="?android:attr/textAppearanceMedium"
tools:text="Adam" />
</RelativeLayout>
Adapter (2018 Kotlin Edition):
class ContactAdapter @Inject constructor() : RecyclerView.Adapter<ContactAdapter.ViewHolder>() {
var onItemClick: ((Contact) -> Unit)? = null
var contacts = emptyList<Contact>()
override fun getItemCount(): Int {
return contacts.size
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item_contact, parent, false))
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val name = contacts[position].name
holder.header.text = name.substring(0, 1)
holder.name.text = name
// if not first item, check if item above has the same header
if (position > 0 && contacts[position - 1].name.substring(0, 1) == name.substring(0, 1)) {
holder.headerTextView.visibility = View.GONE
} else {
holder.headerTextView.visibility = View.VISIBLE
}
}
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val headerTextView: TextView = itemView.tvHeader
val nameTextView: TextView = itemView.tvName
init {
itemView.setOnClickListener {
onItemClick?.invoke(contacts[adapterPosition])
}
}
}
}
Might be helpful as well: RecyclerView itemClickListener in Kotlin
Old Java Adapter Version:
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.DataViewHolder> {
private List<Contact> mData;
@Inject
public RecyclerAdapter() {
mData = new ArrayList<>();
}
public void setData(List<Contact> data) {
mData = data;
}
public Contact getItem(int position){
return mData.get(position);
}
@Override
public DataViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_contact, parent, false);
return new DataViewHolder(itemView);
}
@Override
public void onBindViewHolder(final DataViewHolder holder, int position) {
Contact contact = mData.get(position);
holder.headerTextView.setText(contact.getName().substring(0, 1));
holder.nameTextView.setText(contact.getName());
// if not first item check if item above has the same header
if (position > 0 && mData.get(position - 1).getName().substring(0, 1).equals(contact.getName().substring(0, 1))) {
holder.headerTextView.setVisibility(View.GONE);
} else {
holder.headerTextView.setVisibility(View.VISIBLE);
}
}
@Override
public int getItemCount() {
return mData.size();
}
public class DataViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.text_header)
TextView headerTextView;
@BindView(R.id.text_name)
TextView nameTextView;
public DataViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}
回答2:
You can implement it with the library SectionedRecyclerViewAdapter as I explained in this post.
In order to implement the SwipeLayout, don't extend RecyclerSwipeAdapter, extend SectionedRecyclerViewAdapter and implement the SwipeLayout in ItemViewHolder / onBindItemViewHolder as you have done.
回答3:
You can do it youself by hard codding.There ar smart ways to do this. follow these links. and choose one for you.
https://github.com/afollestad/sectioned-recyclerview https://github.com/truizlop/SectionedRecyclerView http://android-pratap.blogspot.in/2015/12/sectioned-recyclerview-in-android_1.html
You can search more by "sectioned recyclerViews android libraries"
回答4:
Take a look at my library on Github, can be used to easily create sections: RecyclerAdapter & Easy Section
mRecylerView.setLayoutManager(...);
/*create Adapter*/
RecyclerAdapter<Customer> baseAdapter = new RecyclerAdapter<>(...);
/*create sectioned adapter. the Adapter type can be RecyclerView.Adapter*/
SectionedAdapter<String, RecyclerAdapter> adapter = new SectionedAdapter<>(SectionViewHolder.class, baseAdapter);
/*add your sections*/
sectionAdapter.addSection(0/*position*/, "Title Section 1");
/*attach Adapter to RecyclerView*/
mRecylerView.setAdapter(sectionAdapter);
Hope it helps.
来源：https://stackoverflow.com/questions/36907711/how-to-implement-recyclerview-with-section-header-depending-on-category