我尝试构建一个应用程序，该应用程序可以对邮件进行翻新，并且我使用示例Gmail样式，但是我无法在“回收者”视图中添加分页功能，但是我尝试查看其他示例，但我做不到，无法使用我
我该怎么做，创建分页，每次加载有5个结果，并滚动加载其他5个结果。
该想法不是要同时延迟加载50条消息
我的适配器
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnLongClickListener {
public TextView from, subject, message, iconText, timestamp;
public ImageView iconImp, imgProfile;
public LinearLayout messageContainer;
public RelativeLayout iconContainer, iconBack, iconFront;
public MyViewHolder(View view) {
super(view);
from = view.findViewById(R.id.from);
subject = view.findViewById(R.id.txt_primary);
message = view.findViewById(R.id.txt_secondary);
iconText = view.findViewById(R.id.icon_text);
timestamp = view.findViewById(R.id.timestamp);
iconBack = view.findViewById(R.id.icon_back);
iconFront = view.findViewById(R.id.icon_front);
iconImp = view.findViewById(R.id.icon_star);
imgProfile = view.findViewById(R.id.icon_profile);
messageContainer = view.findViewById(R.id.message_container);
iconContainer = view.findViewById(R.id.icon_container);
view.setOnLongClickListener(this);
}
@Override
public boolean onLongClick(View view) {
listener.onRowLongClicked(getAdapterPosition());
view.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
return true;
}
}
public MessagesAdapter(Context mContext, List<Message> messages, MessageAdapterListener listener) {
this.mContext = mContext;
this.messages = messages;
this.listener = listener;
selectedItems = new SparseBooleanArray();
animationItemsIndex = new SparseBooleanArray();
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.message_list_row, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
Message message = messages.get(position);
// displaying text view data
holder.from.setText(message.getFrom());
holder.subject.setText(message.getSubject());
holder.message.setText(message.getMessage());
holder.timestamp.setText(message.getTimestamp());
// displaying the first letter of From in icon text
holder.iconText.setText(message.getFrom().substring(0, 1));
// change the row state to activated
holder.itemView.setActivated(selectedItems.get(position, false));
// change the font style depending on message read status
applyReadStatus(holder, message);
// handle message star
applyImportant(holder, message);
// handle icon animation
applyIconAnimation(holder, position);
// display profile image
applyProfilePicture(holder, message);
// apply click events
applyClickEvents(holder, position);
}
private void applyClickEvents(MyViewHolder holder, final int position) {
holder.iconContainer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
listener.onIconClicked(position);
}
});
holder.iconImp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
listener.onIconImportantClicked(position);
}
});
holder.messageContainer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
listener.onMessageRowClicked(position);
}
});
holder.messageContainer.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
listener.onRowLongClicked(position);
view.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
return true;
}
});
}
private void applyProfilePicture(MyViewHolder holder, Message message) {
if (!TextUtils.isEmpty(message.getPicture())) {
Glide.with(mContext).load(message.getPicture())
.thumbnail(0.5f)
// .crossFade()
// .transform(new CircleTransform(mContext))
//.diskCacheStrategy(DiskCacheStrategy.ALL)
.into(holder.imgProfile);
holder.imgProfile.setColorFilter(null);
holder.iconText.setVisibility(View.GONE);
} else {
holder.imgProfile.setImageResource(R.drawable.bg_circle);
holder.imgProfile.setColorFilter(message.getColor());
holder.iconText.setVisibility(View.VISIBLE);
}
}
private void applyIconAnimation(MyViewHolder holder, int position) {
if (selectedItems.get(position, false)) {
holder.iconFront.setVisibility(View.GONE);
resetIconYAxis(holder.iconBack);
holder.iconBack.setVisibility(View.VISIBLE);
holder.iconBack.setAlpha(1);
if (currentSelectedIndex == position) {
FlipAnimator.flipView(mContext, holder.iconBack, holder.iconFront, true);
resetCurrentIndex();
}
} else {
holder.iconBack.setVisibility(View.GONE);
resetIconYAxis(holder.iconFront);
holder.iconFront.setVisibility(View.VISIBLE);
holder.iconFront.setAlpha(1);
if ((reverseAllAnimations && animationItemsIndex.get(position, false)) || currentSelectedIndex == position) {
FlipAnimator.flipView(mContext, holder.iconBack, holder.iconFront, false);
resetCurrentIndex();
}
}
}
// As the views will be reused, sometimes the icon appears as
// flipped because older view is reused. Reset the Y-axis to 0
private void resetIconYAxis(View view) {
if (view.getRotationY() != 0) {
view.setRotationY(0);
}
}
public void resetAnimationIndex() {
reverseAllAnimations = false;
animationItemsIndex.clear();
}
@Override
public long getItemId(int position) {
return messages.get(position).getId();
}
private void applyImportant(MyViewHolder holder, Message message) {
if (message.isImportant()) {
holder.iconImp.setImageDrawable(ContextCompat.getDrawable(mContext, R.drawable.ic_star_black_24dp));
holder.iconImp.setColorFilter(ContextCompat.getColor(mContext, R.color.icon_tint_selected));
} else {
holder.iconImp.setImageDrawable(ContextCompat.getDrawable(mContext, R.drawable.ic_star_border_black_24dp));
holder.iconImp.setColorFilter(ContextCompat.getColor(mContext, R.color.icon_tint_normal));
}
}
private void applyReadStatus(MyViewHolder holder, Message message) {
if (message.isRead()) {
holder.from.setTypeface(null, Typeface.NORMAL);
holder.subject.setTypeface(null, Typeface.NORMAL);
holder.from.setTextColor(ContextCompat.getColor(mContext, R.color.subject));
holder.subject.setTextColor(ContextCompat.getColor(mContext, R.color.message));
} else {
holder.from.setTypeface(null, Typeface.BOLD);
holder.subject.setTypeface(null, Typeface.BOLD);
holder.from.setTextColor(ContextCompat.getColor(mContext, R.color.from));
holder.subject.setTextColor(ContextCompat.getColor(mContext, R.color.subject));
}
}
@Override
public int getItemCount() {
return messages.size();
}
public void toggleSelection(int pos) {
currentSelectedIndex = pos;
if (selectedItems.get(pos, false)) {
selectedItems.delete(pos);
animationItemsIndex.delete(pos);
} else {
selectedItems.put(pos, true);
animationItemsIndex.put(pos, true);
}
notifyItemChanged(pos);
}
public void clearSelections() {
reverseAllAnimations = true;
selectedItems.clear();
notifyDataSetChanged();
}
public int getSelectedItemCount() {
return selectedItems.size();
}
public List<Integer> getSelectedItems() {
List<Integer> items =
new ArrayList<>(selectedItems.size());
for (int i = 0; i < selectedItems.size(); i++) {
items.add(selectedItems.keyAt(i));
}
return items;
}
public void removeData(int position) {
messages.remove(position);
resetCurrentIndex();
}
private void resetCurrentIndex() {
currentSelectedIndex = -1;
}
public interface MessageAdapterListener {
void onStatusChanged(String s, int i, Bundle bundle);
void onProviderEnabled(String s);
void onProviderDisabled(String s);
void onIconClicked(int position);
void onIconImportantClicked(int position);
void onMessageRowClicked(int position);
void onRowLongClicked(int position);
}
主要活动
private void getInbox() {
swipeRefreshLayout.setRefreshing(true);
ApiInterface apiService =
ApiClient.getClient().create(ApiInterface.class) ;
Map<String, String> datos = new HashMap<>();
datos.put("ruta", user.getRuta());
datos.put("jornada", user.getJornada());
datos.put("id_ppl", user.getId_ppl());
datos.put("placa", user.getPlaca());
Call<List<Message>> call = apiService.getInbox(datos) ;
call.enqueue(new Callback<List<Message>>() {
@Override
public void onResponse(Call<List<Message>> call, Response<List<Message>> response) {
// clear the inbox
messages.clear();
// add all the messages
// messages.addAll(response.body());
// TODO - avoid looping
// the loop was performed to add colors to each message
for (Message message : response.body()) {
// generate a random color
message.setColor(getRandomMaterialColor("400"));
messages.add(message);
}
mAdapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false);
}
@Override
public void onFailure(Call<List<Message>> call, Throwable t) {
Toast.makeText(getApplicationContext(), "Unable to fetch json: " + t.getMessage(), Toast.LENGTH_LONG).show();
swipeRefreshLayout.setRefreshing(false);
}
});
}