Java tutorial
/* * This is the source code of Telegram for Android v. 3.x.x. * It is licensed under GNU GPL v. 2 or later. * You should have received a copy of the license in this archive (see LICENSE). * * Copyright Nikolai Kudashov, 2013-2016. */ package org.telegram.ui; import android.content.Context; import android.support.v4.content.ContextCompat; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import org.telegram.messenger.LocaleController; import org.telegram.messenger.NotificationCenter; import org.telegram.messenger.R; import org.telegram.messenger.query.StickersQuery; import org.telegram.messenger.support.widget.LinearLayoutManager; import org.telegram.messenger.support.widget.RecyclerView; import org.telegram.tgnet.TLRPC; import org.telegram.ui.ActionBar.ActionBar; import org.telegram.ui.ActionBar.BaseFragment; import org.telegram.ui.Cells.FeaturedStickerSetCell; import org.telegram.ui.Cells.TextInfoPrivacyCell; import org.telegram.ui.Components.LayoutHelper; import org.telegram.ui.Components.RecyclerListView; import org.telegram.ui.Components.StickersAlert; import java.util.ArrayList; import java.util.HashMap; public class FeaturedStickersActivity extends BaseFragment implements NotificationCenter.NotificationCenterDelegate { private ListAdapter listAdapter; private LinearLayoutManager layoutManager; private ArrayList<Long> unreadStickers = null; private HashMap<Long, TLRPC.StickerSetCovered> installingStickerSets = new HashMap<>(); private int stickersStartRow; private int stickersEndRow; private int stickersShadowRow; private int rowCount; @Override public boolean onFragmentCreate() { super.onFragmentCreate(); StickersQuery.checkFeaturedStickers(); NotificationCenter.getInstance().addObserver(this, NotificationCenter.featuredStickersDidLoaded); NotificationCenter.getInstance().addObserver(this, NotificationCenter.stickersDidLoaded); ArrayList<Long> arrayList = StickersQuery.getUnreadStickerSets(); if (arrayList != null) { unreadStickers = new ArrayList<>(arrayList); } updateRows(); return true; } @Override public void onFragmentDestroy() { super.onFragmentDestroy(); NotificationCenter.getInstance().removeObserver(this, NotificationCenter.featuredStickersDidLoaded); NotificationCenter.getInstance().removeObserver(this, NotificationCenter.stickersDidLoaded); } @Override public View createView(Context context) { actionBar.setBackButtonImage(R.drawable.ic_ab_back); actionBar.setAllowOverlayTitle(true); actionBar.setTitle(LocaleController.getString("FeaturedStickers", R.string.FeaturedStickers)); actionBar.setActionBarMenuOnItemClick(new ActionBar.ActionBarMenuOnItemClick() { @Override public void onItemClick(int id) { if (id == -1) { finishFragment(); } } }); listAdapter = new ListAdapter(context); fragmentView = new FrameLayout(context); FrameLayout frameLayout = (FrameLayout) fragmentView; frameLayout.setBackgroundColor(ContextCompat.getColor(context, R.color.settings_background)); RecyclerListView listView = new RecyclerListView(context); listView.setItemAnimator(null); listView.setLayoutAnimation(null); listView.setFocusable(true); listView.setTag(14); layoutManager = new LinearLayoutManager(context) { @Override public boolean supportsPredictiveItemAnimations() { return false; } }; layoutManager.setOrientation(LinearLayoutManager.VERTICAL); listView.setLayoutManager(layoutManager); frameLayout.addView(listView, LayoutHelper.createFrame(LayoutHelper.MATCH_PARENT, LayoutHelper.MATCH_PARENT)); listView.setAdapter(listAdapter); listView.setOnItemClickListener(new RecyclerListView.OnItemClickListener() { @Override public void onItemClick(final View view, int position) { if (position >= stickersStartRow && position < stickersEndRow && getParentActivity() != null) { final TLRPC.StickerSetCovered stickerSet = StickersQuery.getFeaturedStickerSets().get(position); TLRPC.InputStickerSet inputStickerSet; if (stickerSet.set.id != 0) { inputStickerSet = new TLRPC.TL_inputStickerSetID(); inputStickerSet.id = stickerSet.set.id; } else { inputStickerSet = new TLRPC.TL_inputStickerSetShortName(); inputStickerSet.short_name = stickerSet.set.short_name; } inputStickerSet.access_hash = stickerSet.set.access_hash; StickersAlert stickersAlert = new StickersAlert(getParentActivity(), FeaturedStickersActivity.this, inputStickerSet, null, null); stickersAlert.setInstallDelegate(new StickersAlert.StickersAlertInstallDelegate() { @Override public void onStickerSetInstalled() { FeaturedStickerSetCell cell = (FeaturedStickerSetCell) view; cell.setDrawProgress(true); installingStickerSets.put(stickerSet.set.id, stickerSet); } @Override public void onStickerSetUninstalled() { } }); showDialog(stickersAlert); } } }); return fragmentView; } @Override public void didReceivedNotification(int id, Object... args) { if (id == NotificationCenter.featuredStickersDidLoaded) { if (unreadStickers == null) { unreadStickers = StickersQuery.getUnreadStickerSets(); } updateRows(); } else if (id == NotificationCenter.stickersDidLoaded) { updateVisibleTrendingSets(); } } private void updateVisibleTrendingSets() { if (layoutManager == null) { return; } int first = layoutManager.findFirstVisibleItemPosition(); if (first == RecyclerView.NO_POSITION) { return; } int last = layoutManager.findLastVisibleItemPosition(); if (last == RecyclerView.NO_POSITION) { return; } listAdapter.notifyItemRangeChanged(first, last - first + 1); } private void updateRows() { rowCount = 0; ArrayList<TLRPC.StickerSetCovered> stickerSets = StickersQuery.getFeaturedStickerSets(); if (!stickerSets.isEmpty()) { stickersStartRow = rowCount; stickersEndRow = rowCount + stickerSets.size(); rowCount += stickerSets.size(); stickersShadowRow = rowCount++; } else { stickersStartRow = -1; stickersEndRow = -1; stickersShadowRow = -1; } if (listAdapter != null) { listAdapter.notifyDataSetChanged(); } StickersQuery.markFaturedStickersAsRead(true); } @Override public void onResume() { super.onResume(); if (listAdapter != null) { listAdapter.notifyDataSetChanged(); } } private class ListAdapter extends RecyclerListView.Adapter { private Context mContext; private class Holder extends RecyclerView.ViewHolder { public Holder(View itemView) { super(itemView); } } public ListAdapter(Context context) { mContext = context; } @Override public int getItemCount() { return rowCount; } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { if (getItemViewType(position) == 0) { ArrayList<TLRPC.StickerSetCovered> arrayList = StickersQuery.getFeaturedStickerSets(); FeaturedStickerSetCell cell = (FeaturedStickerSetCell) holder.itemView; cell.setTag(position); TLRPC.StickerSetCovered stickerSet = arrayList.get(position); cell.setStickersSet(stickerSet, position != arrayList.size() - 1, unreadStickers != null && unreadStickers.contains(stickerSet.set.id)); boolean installing = installingStickerSets.containsKey(stickerSet.set.id); if (installing && cell.isInstalled()) { installingStickerSets.remove(stickerSet.set.id); installing = false; cell.setDrawProgress(false); } cell.setDrawProgress(installing); } } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = null; switch (viewType) { case 0: view = new FeaturedStickerSetCell(mContext); ((FeaturedStickerSetCell) view).setForeground(R.drawable.list_selector); ((FeaturedStickerSetCell) view).setAddOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { FeaturedStickerSetCell parent = (FeaturedStickerSetCell) v.getParent(); TLRPC.StickerSetCovered pack = parent.getStickerSet(); if (installingStickerSets.containsKey(pack.set.id)) { return; } installingStickerSets.put(pack.set.id, pack); StickersQuery.removeStickersSet(getParentActivity(), pack.set, 2, FeaturedStickersActivity.this, false); parent.setDrawProgress(true); } }); break; case 1: view = new TextInfoPrivacyCell(mContext); //view.setBackgroundResource(R.drawable.greydivider_bottom); break; } view.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT)); return new Holder(view); } @Override public int getItemViewType(int i) { if (i >= stickersStartRow && i < stickersEndRow) { return 0; } else if (i == stickersShadowRow) { return 1; } return 0; } } }