Java tutorial
package com.wellsandwhistles.android.redditsp.fragments; /** This file was either copied or modified from https://github.com/QuantumBadger/RedReader * under the Free Software Foundation General Public License version 3*/ import android.annotation.SuppressLint; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.TextView; import com.wellsandwhistles.android.redditsp.R; import com.wellsandwhistles.android.redditsp.account.RedditAccount; import com.wellsandwhistles.android.redditsp.account.RedditAccountManager; import com.wellsandwhistles.android.redditsp.activities.BugReportActivity; import com.wellsandwhistles.android.redditsp.activities.CommentReplyActivity; import com.wellsandwhistles.android.redditsp.activities.OptionsMenuUtility; import com.wellsandwhistles.android.redditsp.adapters.FilteredCommentListingManager; import com.wellsandwhistles.android.redditsp.cache.downloadstrategy.DownloadStrategy; import com.wellsandwhistles.android.redditsp.cache.downloadstrategy.DownloadStrategyAlways; import com.wellsandwhistles.android.redditsp.cache.downloadstrategy.DownloadStrategyIfNotCached; import com.wellsandwhistles.android.redditsp.common.General; import com.wellsandwhistles.android.redditsp.common.PrefsUtility; import com.wellsandwhistles.android.redditsp.common.SRError; import com.wellsandwhistles.android.redditsp.common.SRThemeAttributes; import com.wellsandwhistles.android.redditsp.common.SRTime; import com.wellsandwhistles.android.redditsp.reddit.CommentListingRequest; import com.wellsandwhistles.android.redditsp.reddit.RedditCommentListItem; import com.wellsandwhistles.android.redditsp.reddit.api.RedditAPICommentAction; import com.wellsandwhistles.android.redditsp.reddit.prepared.RedditChangeDataManager; import com.wellsandwhistles.android.redditsp.reddit.prepared.RedditPreparedPost; import com.wellsandwhistles.android.redditsp.reddit.prepared.RedditRenderableComment; import com.wellsandwhistles.android.redditsp.reddit.url.RedditURLParser; import com.wellsandwhistles.android.redditsp.views.RedditCommentView; import com.wellsandwhistles.android.redditsp.views.RedditPostHeaderView; import com.wellsandwhistles.android.redditsp.views.ScrollbarRecyclerViewManager; import com.wellsandwhistles.android.redditsp.views.liststatus.CommentSubThreadView; import com.wellsandwhistles.android.redditsp.views.liststatus.ErrorView; import java.util.ArrayList; import java.util.LinkedList; import java.util.UUID; public class CommentListingFragment extends SRFragment implements RedditPreparedPost.PostSelectionListener, RedditCommentView.CommentListener, CommentListingRequest.Listener { private static final String SAVEDSTATE_FIRST_VISIBLE_POS = "firstVisiblePosition"; private final RedditAccount mUser; private final ArrayList<RedditURLParser.RedditURL> mAllUrls; private final LinkedList<RedditURLParser.RedditURL> mUrlsToDownload; private final UUID mSession; private final DownloadStrategy mDownloadStrategy; private RedditPreparedPost mPost = null; private boolean isArchived; private final FilteredCommentListingManager mCommentListingManager; private final RecyclerView mRecyclerView; private final FrameLayout mOuterFrame; private final float mCommentFontScale; private final boolean mShowLinkButtons; private Long mCachedTimestamp = null; private Integer mPreviousFirstVisibleItemPosition; public CommentListingFragment(final AppCompatActivity parent, final Bundle savedInstanceState, final ArrayList<RedditURLParser.RedditURL> urls, final UUID session, final String searchString, final boolean forceDownload) { super(parent, savedInstanceState); if (savedInstanceState != null) { mPreviousFirstVisibleItemPosition = savedInstanceState.getInt(SAVEDSTATE_FIRST_VISIBLE_POS); } mCommentListingManager = new FilteredCommentListingManager(parent, searchString); mAllUrls = urls; mUrlsToDownload = new LinkedList<>(mAllUrls); this.mSession = session; if (forceDownload) { mDownloadStrategy = DownloadStrategyAlways.INSTANCE; } else { mDownloadStrategy = DownloadStrategyIfNotCached.INSTANCE; } mUser = RedditAccountManager.getInstance(getActivity()).getDefaultAccount(); parent.invalidateOptionsMenu(); final Context context = getActivity(); final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); mCommentFontScale = PrefsUtility.appearance_fontscale_comments(context, prefs); mShowLinkButtons = PrefsUtility.pref_appearance_linkbuttons(context, prefs); mOuterFrame = new FrameLayout(context); final ScrollbarRecyclerViewManager recyclerViewManager = new ScrollbarRecyclerViewManager(context, null, false); if (parent instanceof OptionsMenuUtility.OptionsMenuCommentsListener && PrefsUtility.pref_behaviour_enable_swipe_refresh(context, prefs)) { recyclerViewManager.enablePullToRefresh(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { ((OptionsMenuUtility.OptionsMenuCommentsListener) parent).onRefreshComments(); } }); } mRecyclerView = recyclerViewManager.getRecyclerView(); mCommentListingManager.setLayoutManager((LinearLayoutManager) mRecyclerView.getLayoutManager()); mRecyclerView.setAdapter(mCommentListingManager.getAdapter()); mOuterFrame.addView(recyclerViewManager.getOuterView()); mRecyclerView.setItemAnimator(null); /* TODO { final RecyclerView.ItemAnimator itemAnimator = mRecyclerView.getItemAnimator(); itemAnimator.setRemoveDuration(80); itemAnimator.setChangeDuration(80); itemAnimator.setAddDuration(80); itemAnimator.setMoveDuration(80); } */ makeNextRequest(context); } public void handleCommentVisibilityToggle(final RedditCommentView view) { final RedditChangeDataManager changeDataManager = RedditChangeDataManager.getInstance(mUser); final RedditCommentListItem item = view.getComment(); if (item.isComment()) { final RedditRenderableComment comment = item.asComment(); changeDataManager.markHidden(SRTime.utcCurrentTimeMillis(), comment, !comment.isCollapsed(changeDataManager)); mCommentListingManager.updateHiddenStatus(); final LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager(); final int position = layoutManager.getPosition(view); if (position == layoutManager.findFirstVisibleItemPosition()) { layoutManager.scrollToPositionWithOffset(position, 0); } } } @Override public View getView() { return mOuterFrame; } @Override public Bundle onSaveInstanceState() { final Bundle bundle = new Bundle(); final LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager(); bundle.putInt(SAVEDSTATE_FIRST_VISIBLE_POS, layoutManager.findFirstVisibleItemPosition()); return bundle; } @SuppressLint("WrongConstant") private void makeNextRequest(final Context context) { if (!mUrlsToDownload.isEmpty()) { new CommentListingRequest(context, this, getActivity(), mUrlsToDownload.getFirst(), mAllUrls.size() == 1, mUrlsToDownload.getFirst(), mUser, mSession, mDownloadStrategy, this); } } @Override public void onCommentClicked(final RedditCommentView view) { switch (PrefsUtility.pref_behaviour_actions_comment_tap(getActivity(), PreferenceManager.getDefaultSharedPreferences(getActivity()))) { case COLLAPSE: handleCommentVisibilityToggle(view); break; case ACTION_MENU: { final RedditCommentListItem item = view.getComment(); if (item != null && item.isComment()) { RedditAPICommentAction.showActionMenu(getActivity(), this, item.asComment(), view, RedditChangeDataManager.getInstance(mUser), isArchived); } break; } } } @Override public void onCommentLongClicked(final RedditCommentView view) { switch (PrefsUtility.pref_behaviour_actions_comment_longclick(getActivity(), PreferenceManager.getDefaultSharedPreferences(getActivity()))) { case ACTION_MENU: { final RedditCommentListItem item = view.getComment(); if (item != null && item.isComment()) { RedditAPICommentAction.showActionMenu(getActivity(), this, item.asComment(), view, RedditChangeDataManager.getInstance(mUser), isArchived); } break; } case COLLAPSE: handleCommentVisibilityToggle(view); break; case NOTHING: break; } } @Override public void onCommentListingRequestDownloadNecessary() { mCommentListingManager.setLoadingVisible(true); } @Override public void onCommentListingRequestDownloadStarted() { } @Override public void onCommentListingRequestException(final Throwable t) { BugReportActivity.handleGlobalError(getActivity(), t); } @Override public void onCommentListingRequestFailure(final SRError error) { mCommentListingManager.setLoadingVisible(false); mCommentListingManager.addFooterError(new ErrorView(getActivity(), error)); } @Override public void onCommentListingRequestCachedCopy(final long timestamp) { mCachedTimestamp = timestamp; } @Override public void onCommentListingRequestParseStart() { mCommentListingManager.setLoadingVisible(true); } @Override public void onCommentListingRequestAuthorizing() { mCommentListingManager.setLoadingVisible(true); } @Override public void onCommentListingRequestPostDownloaded(final RedditPreparedPost post) { final Context context = getActivity(); if (mPost == null) { final SRThemeAttributes attr = new SRThemeAttributes(context); mPost = post; isArchived = post.isArchived; final RedditPostHeaderView postHeader = new RedditPostHeaderView(getActivity(), this.mPost); mCommentListingManager.addPostHeader(postHeader); ((LinearLayoutManager) mRecyclerView.getLayoutManager()).scrollToPositionWithOffset(0, 0); if (post.src.getSelfText() != null) { final ViewGroup selfText = post.src.getSelfText().buildView(getActivity(), attr.srMainTextCol, 14f * mCommentFontScale, mShowLinkButtons); selfText.setFocusable(false); selfText.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS); final int paddingPx = General.dpToPixels(context, 10); final FrameLayout paddingLayout = new FrameLayout(context); final TextView collapsedView = new TextView(context); collapsedView.setText("[ + ] " + getActivity().getString(R.string.collapsed_self_post)); collapsedView.setVisibility(View.GONE); collapsedView.setPadding(paddingPx, paddingPx, paddingPx, paddingPx); paddingLayout.addView(selfText); paddingLayout.addView(collapsedView); paddingLayout.setPadding(paddingPx, paddingPx, paddingPx, paddingPx); paddingLayout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (selfText.getVisibility() == View.GONE) { selfText.setVisibility(View.VISIBLE); collapsedView.setVisibility(View.GONE); } else { selfText.setVisibility(View.GONE); collapsedView.setVisibility(View.VISIBLE); } } }); // TODO mListHeaderNotifications.setBackgroundColor(Color.argb(35, 128, 128, 128)); mCommentListingManager.addPostSelfText(paddingLayout); } if (!General.isTablet(context, PreferenceManager.getDefaultSharedPreferences(context))) { getActivity().setTitle(post.src.getTitle()); } if (mCommentListingManager.isSearchListing()) { final CommentSubThreadView searchCommentThreadView = new CommentSubThreadView(getActivity(), mAllUrls.get(0).asPostCommentListURL(), R.string.comment_header_search_thread_title); mCommentListingManager.addNotification(searchCommentThreadView); } else if (!mAllUrls.isEmpty() && mAllUrls.get(0).pathType() == RedditURLParser.POST_COMMENT_LISTING_URL && mAllUrls.get(0).asPostCommentListURL().commentId != null) { final CommentSubThreadView specificCommentThreadView = new CommentSubThreadView(getActivity(), mAllUrls.get(0).asPostCommentListURL(), R.string.comment_header_specific_thread_title); mCommentListingManager.addNotification(specificCommentThreadView); } // TODO pref (currently 10 mins) if (mCachedTimestamp != null && SRTime.since(mCachedTimestamp) > 10 * 60 * 1000) { final TextView cacheNotif = (TextView) LayoutInflater.from(getActivity()) .inflate(R.layout.cached_header, null, false); cacheNotif.setText(getActivity().getString(R.string.listing_cached, SRTime.formatDateTime(mCachedTimestamp, getActivity()))); mCommentListingManager.addNotification(cacheNotif); } } } @Override public void onCommentListingRequestAllItemsDownloaded(final ArrayList<RedditCommentListItem> items) { mCommentListingManager.addComments(items); mUrlsToDownload.removeFirst(); final LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager(); if (mPreviousFirstVisibleItemPosition != null && layoutManager.getItemCount() > mPreviousFirstVisibleItemPosition) { layoutManager.scrollToPositionWithOffset(mPreviousFirstVisibleItemPosition, 0); mPreviousFirstVisibleItemPosition = null; } if (mUrlsToDownload.isEmpty()) { if (mCommentListingManager.getCommentCount() == 0) { final View emptyView = LayoutInflater.from(getContext()).inflate(R.layout.no_comments_yet, mRecyclerView, false); if (mCommentListingManager.isSearchListing()) { ((TextView) emptyView.findViewById(R.id.empty_view_text)).setText(R.string.no_search_results); } mCommentListingManager.addViewToItems(emptyView); } else { final View blankView = new View(getContext()); blankView.setMinimumWidth(1); blankView.setMinimumHeight(General.dpToPixels(getContext(), 96)); mCommentListingManager.addViewToItems(blankView); } mCommentListingManager.setLoadingVisible(false); } else { makeNextRequest(getActivity()); } } @Override public void onCreateOptionsMenu(Menu menu) { if (mAllUrls != null && mAllUrls.size() > 0 && mAllUrls.get(0).pathType() == RedditURLParser.POST_COMMENT_LISTING_URL) { menu.add(R.string.action_reply); } } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getTitle() != null && item.getTitle().equals(getActivity().getString(R.string.action_reply))) { onParentReply(); return true; } return false; } private void onParentReply() { if (mPost != null) { final Intent intent = new Intent(getActivity(), CommentReplyActivity.class); intent.putExtra(CommentReplyActivity.PARENT_ID_AND_TYPE_KEY, mPost.src.getIdAndType()); intent.putExtra(CommentReplyActivity.PARENT_MARKDOWN_KEY, mPost.src.getUnescapedSelfText()); startActivity(intent); } else { General.quickToast(getActivity(), R.string.error_toast_parent_post_not_downloaded); } } public void onPostSelected(final RedditPreparedPost post) { ((RedditPreparedPost.PostSelectionListener) getActivity()).onPostSelected(post); } public void onPostCommentsSelected(final RedditPreparedPost post) { ((RedditPreparedPost.PostSelectionListener) getActivity()).onPostCommentsSelected(post); } }