Java tutorial
/* Copyright 2017 Andrew Dawson * * This file is a part of Tusky. * * This program is free software; you can redistribute it and/or modify it under the terms of the * GNU General Public License as published by the Free Software Foundation; either version 3 of the * License, or (at your option) any later version. * * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General * Public License for more details. * * You should have received a copy of the GNU General Public License along with Tusky; if not, * see <http://www.gnu.org/licenses>. */ package com.keylesspalace.tusky; import android.content.Context; import android.graphics.Typeface; import android.support.annotation.Nullable; import android.support.v4.content.ContextCompat; import android.support.v7.widget.RecyclerView; import android.text.SpannableStringBuilder; import android.text.Spanned; import android.text.style.StyleSpan; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import com.keylesspalace.tusky.entity.Notification; import com.keylesspalace.tusky.entity.Status; import com.squareup.picasso.Picasso; import java.util.ArrayList; import java.util.List; class NotificationsAdapter extends RecyclerView.Adapter implements AdapterItemRemover { private static final int VIEW_TYPE_MENTION = 0; private static final int VIEW_TYPE_FOOTER = 1; private static final int VIEW_TYPE_STATUS_NOTIFICATION = 2; private static final int VIEW_TYPE_FOLLOW = 3; private List<Notification> notifications; private StatusActionListener statusListener; private NotificationActionListener notificationActionListener; NotificationsAdapter(StatusActionListener statusListener, NotificationActionListener notificationActionListener) { super(); notifications = new ArrayList<>(); this.statusListener = statusListener; this.notificationActionListener = notificationActionListener; } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { switch (viewType) { default: case VIEW_TYPE_MENTION: { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_status, parent, false); return new StatusViewHolder(view); } case VIEW_TYPE_FOOTER: { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_footer, parent, false); return new FooterViewHolder(view); } case VIEW_TYPE_STATUS_NOTIFICATION: { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_status_notification, parent, false); return new StatusNotificationViewHolder(view); } case VIEW_TYPE_FOLLOW: { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_follow, parent, false); return new FollowViewHolder(view); } } } @Override public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) { if (position < notifications.size()) { Notification notification = notifications.get(position); Notification.Type type = notification.type; switch (type) { case MENTION: { StatusViewHolder holder = (StatusViewHolder) viewHolder; Status status = notification.status; holder.setupWithStatus(status, statusListener); break; } case FAVOURITE: case REBLOG: { StatusNotificationViewHolder holder = (StatusNotificationViewHolder) viewHolder; holder.setMessage(type, notification.account.getDisplayName(), notification.status); holder.setupButtons(notificationActionListener, notification.account.id); break; } case FOLLOW: { FollowViewHolder holder = (FollowViewHolder) viewHolder; holder.setMessage(notification.account.getDisplayName(), notification.account.username, notification.account.avatar); holder.setupButtons(notificationActionListener, notification.account.id); break; } } } } @Override public int getItemCount() { return notifications.size() + 1; } @Override public int getItemViewType(int position) { if (position == notifications.size()) { return VIEW_TYPE_FOOTER; } else { Notification notification = notifications.get(position); switch (notification.type) { default: case MENTION: { return VIEW_TYPE_MENTION; } case FAVOURITE: case REBLOG: { return VIEW_TYPE_STATUS_NOTIFICATION; } case FOLLOW: { return VIEW_TYPE_FOLLOW; } } } } public @Nullable Notification getItem(int position) { if (position >= 0 && position < notifications.size()) { return notifications.get(position); } return null; } void update(List<Notification> newNotifications) { if (newNotifications == null || newNotifications.isEmpty()) { return; } if (notifications.isEmpty()) { notifications = newNotifications; } else { int index = notifications.indexOf(newNotifications.get(newNotifications.size() - 1)); for (int i = 0; i < index; i++) { notifications.remove(0); } int newIndex = newNotifications.indexOf(notifications.get(0)); if (newIndex == -1) { notifications.addAll(0, newNotifications); } else { notifications.addAll(0, newNotifications.subList(0, newIndex)); } } notifyDataSetChanged(); } void addItems(List<Notification> new_notifications) { int end = notifications.size(); notifications.addAll(new_notifications); notifyItemRangeInserted(end, new_notifications.size()); } public void removeItem(int position) { notifications.remove(position); notifyItemChanged(position); } interface NotificationActionListener { void onViewAccount(String id); } private static class FollowViewHolder extends RecyclerView.ViewHolder { private TextView message; private TextView usernameView; private TextView displayNameView; private ImageView avatar; FollowViewHolder(View itemView) { super(itemView); message = (TextView) itemView.findViewById(R.id.notification_text); usernameView = (TextView) itemView.findViewById(R.id.notification_username); displayNameView = (TextView) itemView.findViewById(R.id.notification_display_name); avatar = (ImageView) itemView.findViewById(R.id.notification_avatar); } void setMessage(String displayName, String username, String avatarUrl) { Context context = message.getContext(); String format = context.getString(R.string.notification_follow_format); String wholeMessage = String.format(format, displayName); message.setText(wholeMessage); format = context.getString(R.string.status_username_format); String wholeUsername = String.format(format, username); usernameView.setText(wholeUsername); displayNameView.setText(displayName); Picasso.with(context).load(avatarUrl).placeholder(R.drawable.avatar_default) .error(R.drawable.avatar_error).into(avatar); } void setupButtons(final NotificationActionListener listener, final String accountId) { avatar.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { listener.onViewAccount(accountId); } }); } } private static class StatusNotificationViewHolder extends RecyclerView.ViewHolder { private TextView message; private ImageView icon; private TextView statusContent; private ViewGroup container; StatusNotificationViewHolder(View itemView) { super(itemView); message = (TextView) itemView.findViewById(R.id.notification_text); icon = (ImageView) itemView.findViewById(R.id.notification_icon); statusContent = (TextView) itemView.findViewById(R.id.notification_content); container = (ViewGroup) itemView.findViewById(R.id.notification_container); } void setMessage(Notification.Type type, String displayName, Status status) { Context context = message.getContext(); String format; switch (type) { default: case FAVOURITE: { icon.setImageResource(R.drawable.ic_star_24dp); icon.setColorFilter(ContextCompat.getColor(context, R.color.status_favourite_button_marked_dark)); format = context.getString(R.string.notification_favourite_format); break; } case REBLOG: { icon.setImageResource(R.drawable.ic_repeat_24dp); icon.setColorFilter(ContextCompat.getColor(context, R.color.color_accent_dark)); format = context.getString(R.string.notification_reblog_format); break; } } String wholeMessage = String.format(format, displayName); final SpannableStringBuilder str = new SpannableStringBuilder(wholeMessage); str.setSpan(new StyleSpan(Typeface.BOLD), 0, displayName.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); message.setText(str); statusContent.setText(status.content); } void setupButtons(final NotificationActionListener listener, final String accountId) { container.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { listener.onViewAccount(accountId); } }); } } }