Java tutorial
/* * Copyright 2017 lizhaotailang * * 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.pagenews.zhihudaily.homepage; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.support.v4.app.Fragment; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.pagenews.zhihudaily.R; import com.pagenews.zhihudaily.adapter.DoubanMomentAdapter; import com.pagenews.zhihudaily.bean.DoubanMomentNews; import com.pagenews.zhihudaily.interfaze.OnRecyclerViewOnClickListener; import com.wdullaer.materialdatetimepicker.date.DatePickerDialog; import java.util.ArrayList; import java.util.Calendar; /** * Created by Lizhaotailang on 2016/8/11. */ public class DoubanMomentFragment extends Fragment implements DoubanMomentContract.View { private RecyclerView recyclerView; private SwipeRefreshLayout refreshLayout; private FloatingActionButton fab; private DoubanMomentAdapter adapter; private DoubanMomentContract.Presenter presenter; private int mYear = Calendar.getInstance().get(Calendar.YEAR); private int mMonth = Calendar.getInstance().get(Calendar.MONTH); private int mDay = Calendar.getInstance().get(Calendar.DAY_OF_MONTH); // requires an empty constructor public DoubanMomentFragment() { } public static DoubanMomentFragment newInstance() { return new DoubanMomentFragment(); } @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_list, container, false); initViews(view); presenter.start(); refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { presenter.loadPosts(Calendar.getInstance().getTimeInMillis(), true); } }); recyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() { boolean isSlidingToLast = false; @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager(); // ? if (newState == RecyclerView.SCROLL_STATE_IDLE) { // ??itemposition int lastVisibleItem = manager.findLastCompletelyVisibleItemPosition(); int totalItemCount = manager.getItemCount(); // ?? if (lastVisibleItem == (totalItemCount - 1) && isSlidingToLast) { Calendar c = Calendar.getInstance(); c.set(mYear, mMonth, --mDay); presenter.loadMore(c.getTimeInMillis()); } } super.onScrollStateChanged(recyclerView, newState); } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); isSlidingToLast = dy > 0; // ??fab if (dy > 0) { fab.hide(); } else { fab.show(); } } }); return view; } @Override public void setPresenter(DoubanMomentContract.Presenter presenter) { if (presenter != null) { this.presenter = presenter; } } @Override public void initViews(View view) { recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView); recyclerView.setHasFixedSize(true); recyclerView.setLayoutManager(new LinearLayoutManager(getContext())); fab = (FloatingActionButton) getActivity().findViewById(R.id.fab); fab.setRippleColor(getResources().getColor(R.color.colorPrimaryDark)); refreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.refreshLayout); // refreshLayout.setColorSchemeResources(R.color.colorPrimary); } @Override public void startLoading() { refreshLayout.setRefreshing(true); } @Override public void stopLoading() { refreshLayout.setRefreshing(false); } @Override public void showLoadingError() { Snackbar.make(fab, R.string.loaded_failed, Snackbar.LENGTH_INDEFINITE) .setAction(R.string.retry, new View.OnClickListener() { @Override public void onClick(View v) { presenter.refresh(); } }).show(); } @Override public void showResults(ArrayList<DoubanMomentNews.posts> list) { if (adapter == null) { adapter = new DoubanMomentAdapter(getContext(), list); adapter.setItemClickListener(new OnRecyclerViewOnClickListener() { @Override public void OnItemClick(View v, int position) { presenter.startReading(position); } }); recyclerView.setAdapter(adapter); } else { adapter.notifyDataSetChanged(); } } public void showPickDialog() { Calendar now = Calendar.getInstance(); now.set(mYear, mMonth, mDay); DatePickerDialog dialog = DatePickerDialog.newInstance(new DatePickerDialog.OnDateSetListener() { @Override public void onDateSet(DatePickerDialog view, int year, int monthOfYear, int dayOfMonth) { Calendar temp = Calendar.getInstance(); temp.clear(); temp.set(year, monthOfYear, dayOfMonth); mYear = year; mMonth = monthOfYear; mDay = dayOfMonth; presenter.loadPosts(temp.getTimeInMillis(), true); } }, now.get(Calendar.YEAR), now.get(Calendar.MONTH), now.get(Calendar.DAY_OF_MONTH)); dialog.setMaxDate(Calendar.getInstance()); Calendar minDate = Calendar.getInstance(); minDate.set(2014, 5, 12); dialog.setMinDate(minDate); // set the dialog not vibrate when date change, default value is true dialog.vibrate(false); dialog.show(getActivity().getFragmentManager(), "DatePickerDialog"); } }