Java tutorial
/* * Copyright 2014 sonaive.com. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.sonaive.v2ex.ui; import android.app.Fragment; import android.app.LoaderManager; import android.content.CursorLoader; import android.content.Loader; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.BaseColumns; import android.support.v4.view.ViewCompat; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.text.Html; import android.text.format.DateUtils; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import com.sonaive.v2ex.R; import com.sonaive.v2ex.io.model.Feed; import com.sonaive.v2ex.provider.V2exContract; import com.sonaive.v2ex.sync.SyncHelper; import com.sonaive.v2ex.sync.api.Api; import com.sonaive.v2ex.ui.adapter.ReviewCursorAdapter; import com.sonaive.v2ex.ui.widgets.FlexibleRecyclerView; import com.sonaive.v2ex.ui.widgets.URLImageParser; import com.sonaive.v2ex.ui.widgets.html.HtmlTextView; import com.sonaive.v2ex.util.ImageLoader; import com.sonaive.v2ex.util.UIUtils; import com.sonaive.v2ex.widget.HeaderViewRecyclerAdapter; import com.sonaive.v2ex.widget.LoadingState; import com.sonaive.v2ex.widget.OnLoadMoreDataListener; import com.sonaive.v2ex.widget.PaginationCursorAdapter; import static com.sonaive.v2ex.util.LogUtils.LOGD; import static com.sonaive.v2ex.util.LogUtils.makeLogTag; /** * Created by liutao on 12/21/14. */ public class ReviewsFragment extends Fragment implements OnLoadMoreDataListener { private static final String TAG = makeLogTag(ReviewsFragment.class); FlexibleRecyclerView mRecyclerView = null; TextView mEmptyView = null; View footer; ReviewCursorAdapter mAdapter; HeaderViewRecyclerAdapter headerAdapter; RecyclerView.LayoutManager mLayoutManager; Bundle loaderArgs; Feed mFeed; int hit = 1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mAdapter = new ReviewCursorAdapter(getActivity(), null, 0); mAdapter.setOnLoadMoreDataListener(this); loaderArgs = new Bundle(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View root = inflater.inflate(R.layout.list_fragment_layout, container, false); View header = inflater.inflate(R.layout.item_feed_detail, container, false); footer = inflater.inflate(R.layout.item_footer, container, false); Bundle args = getArguments(); mFeed = args.getParcelable("feed"); initHeader(header); mRecyclerView = (FlexibleRecyclerView) root.findViewById(R.id.recycler_view); mLayoutManager = new LinearLayoutManager(getActivity()); mRecyclerView.setLayoutManager(mLayoutManager); headerAdapter = new HeaderViewRecyclerAdapter(mAdapter); headerAdapter.addHeaderView(header); headerAdapter.addFooterView(footer); mRecyclerView.setAdapter(headerAdapter); mEmptyView = (TextView) root.findViewById(android.R.id.empty); return root; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); if (!((FeedDetailActivity) getActivity()).checkShowNoNetworkButterBar()) { // Set progress bar refreshing. ((FeedDetailActivity) getActivity()).updateSwipeRefreshProgressbarTopClearence(); ((BaseActivity) getActivity()).onRefreshingStateChanged(true); mAdapter.setLoadingState(LoadingState.LOADING); Bundle args = new Bundle(); args.putString(Api.ARG_API_NAME, Api.API_REVIEWS); args.putInt(Api.ARG_API_PARAMS_ID, mFeed.id); SyncHelper.requestManualSync(getActivity(), args); } } @Override public void onResume() { super.onResume(); // Initializes the CursorLoader, the loader id must starts from 1, because // The BaseActivity already takes 0 loader id. getLoaderManager().initLoader(1, buildQueryParameter(), new ReviewsLoaderCallback()); } public void setContentTopClearance(final int clearance, final boolean isActionbarShown) { if (mRecyclerView != null) { mRecyclerView.setContentTopClearance(clearance); // In case butter bar shows, the recycler view should scroll down. if (isActionbarShown) { RecyclerView.LayoutManager layoutManager = mRecyclerView.getLayoutManager(); if (layoutManager instanceof LinearLayoutManager) { int index = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition(); if (index == 0) { mRecyclerView.smoothScrollBy(0, -clearance); } } } } } public boolean canRecyclerViewScrollUp() { return ViewCompat.canScrollVertically(mRecyclerView, -1); } @Override public void onLoadMoreData() { mAdapter.setLoadingState(LoadingState.LOADING); ((FeedDetailActivity) getActivity()).updateSwipeRefreshProgressbarTopClearence(); ((BaseActivity) getActivity()).onRefreshingStateChanged(true); getLoaderManager().restartLoader(1, buildQueryParameter(), new ReviewsLoaderCallback()); LOGD(TAG, "Load more reviews, loading state is: " + LoadingState.LOADING + ", preparing to load page " + mAdapter.getLoadedPage()); } private void initHeader(View header) { if (mFeed != null) { ImageLoader imageLoader = new ImageLoader(getActivity(), R.drawable.person_image_empty); TextView title = (TextView) header.findViewById(R.id.title); HtmlTextView content = (HtmlTextView) header.findViewById(R.id.content); ImageView avatar = (ImageView) header.findViewById(R.id.avatar); TextView name = (TextView) header.findViewById(R.id.name); TextView time = (TextView) header.findViewById(R.id.time); TextView replies = (TextView) header.findViewById(R.id.replies); TextView nodeTitle = (TextView) header.findViewById(R.id.node_title); title.setText(mFeed.title); content.setVisibility(View.VISIBLE); content.setText( Html.fromHtml(mFeed.content_rendered, new URLImageParser(getActivity(), content), null)); if (mFeed.member != null) { String avatarUrl = mFeed.member.avatar_large; if (avatarUrl != null) { avatarUrl = avatarUrl.startsWith("http:") ? avatarUrl : "http:" + avatarUrl; } else { avatarUrl = ""; } imageLoader.loadImage(avatarUrl, avatar); name.setText(mFeed.member.username); } if (mFeed.member != null) { nodeTitle.setText(mFeed.node.title); } time.setText(DateUtils.getRelativeTimeSpanString(mFeed.created * 1000, System.currentTimeMillis(), DateUtils.MINUTE_IN_MILLIS)); replies.setText(mFeed.replies + getString(R.string.noun_reply)); } } class ReviewsLoaderCallback implements LoaderManager.LoaderCallbacks<Cursor> { @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { int limit = args.getInt("limit"); int offset = args.getInt("offset"); LOGD(TAG, "Reviews limit is: " + limit + ", offset is: " + offset); Uri uri = V2exContract.Reviews.buildReviewTopicUri(String.valueOf(mFeed.id)).buildUpon() .appendQueryParameter(V2exContract.QUERY_PARAMETER_LIMIT, String.valueOf(limit)).build(); return new CursorLoader(getActivity(), uri, PROJECTION, null, null, V2exContract.Reviews.REVIEW_CREATED + " ASC"); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { LOGD(TAG, "onLoadFinished HIT COUNT: " + hit++); UIUtils.invalidateFooterState(getActivity().getApplicationContext(), footer, mAdapter.getLoadingState()); if (data == null || data.getCount() % PaginationCursorAdapter.pageSize > 0) { mAdapter.setLoadingState(LoadingState.NO_MORE_DATA); LOGD(TAG, "Reviews count is: " + (data == null ? 0 : data.getCount()) + ", loading state is: " + LoadingState.NO_MORE_DATA); } else { mAdapter.setLoadingState(LoadingState.FINISH); LOGD(TAG, "Reviews count is: " + (data.getCount()) + ", loading state is: " + LoadingState.FINISH); } ((FeedDetailActivity) getActivity()).onRefreshingStateChanged(false); mAdapter.swapCursor(data); } @Override public void onLoaderReset(Loader<Cursor> loader) { loader = null; } } private Bundle buildQueryParameter() { loaderArgs.putInt("limit", (mAdapter.getLoadedPage() + 1) * PaginationCursorAdapter.pageSize); return loaderArgs; } private static final String[] PROJECTION = { BaseColumns._ID, V2exContract.Reviews.REVIEW_MEMBER, V2exContract.Reviews.REVIEW_CONTENT, V2exContract.Reviews.REVIEW_CREATED, }; }