Java tutorial
/* * MIT License * * Copyright (c) 2016. Dmytro Karataiev * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package com.adkdevelopment.e_contact.ui; import android.app.ActivityOptions; import android.content.Context; import android.content.Intent; import android.os.Build; import android.os.Bundle; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.Pair; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ProgressBar; import android.widget.TextView; import com.adkdevelopment.e_contact.R; import com.adkdevelopment.e_contact.data.local.TaskRealm; import com.adkdevelopment.e_contact.interfaces.ItemClickListener; import com.adkdevelopment.e_contact.ui.adapters.TasksAdapter; import com.adkdevelopment.e_contact.ui.base.BaseFragment; import com.adkdevelopment.e_contact.ui.contract.TasksContract; import com.adkdevelopment.e_contact.ui.presenters.TasksPresenter; import java.util.List; import javax.inject.Inject; import butterknife.BindView; import butterknife.ButterKnife; import butterknife.Unbinder; /** * Fragment which shows all the available tasks * Responds to Swipe to refresh, double-click on tabs (scroll to the top), * Pagination of downloads * Created by karataev on 5/10/16. */ public class TasksFragment extends BaseFragment implements TasksContract.View, ItemClickListener<TaskRealm, View> { private static final String ARG_SECTION_NUMBER = "section_number"; private static final String ARG_SECTION_STATE = "section_state"; @Inject TasksPresenter mPresenter; @Inject TasksAdapter mAdapter; @BindView(R.id.recyclerview) RecyclerView mRecyclerView; @BindView(R.id.swipe_refresh_layout) SwipeRefreshLayout mSwipeRefreshLayout; @BindView(R.id.list_empty_text) TextView mListEmpty; @BindView(R.id.progress_bar) ProgressBar mProgressBar; private Unbinder mUnbinder; private int mCurrentPosition; private int mCurrentPage = 1; private boolean isUpdating; /** * Returns a new instance of this fragment for the given section * number. */ public static TasksFragment newInstance(int sectionNumber, String sectionState) { TasksFragment fragment = new TasksFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); args.putString(ARG_SECTION_STATE, sectionState); fragment.setArguments(args); return fragment; } @Override public void onAttach(Context context) { super.onAttach(context); ((MainActivity) getActivity()).getActivityComponent().injectFragment(this); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_tasks, container, false); mUnbinder = ButterKnife.bind(this, rootView); mRecyclerView.setAdapter(mAdapter); mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext())); mPresenter.attachView(this); requestUpdate(); mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { // on force refresh downloads all data mPresenter.fetchData(getArguments().getInt(ARG_SECTION_NUMBER), TaskRealm.QUERY_ALL, TaskRealm.QUERY_ALL); } }); mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); int adapterItems = mRecyclerView.getAdapter().getItemCount(); if (adapterItems > 0 && dy > 0) { mCurrentPosition = ((LinearLayoutManager) mRecyclerView.getLayoutManager()) .findFirstVisibleItemPosition(); if (mCurrentPosition >= adapterItems - TaskRealm.QUERY_START && !isUpdating) { mCurrentPage = adapterItems / TaskRealm.QUERY_AMOUNT; int offset = mCurrentPage * TaskRealm.QUERY_OFFSET; mCurrentPage++; mPresenter.fetchData(getArguments().getInt(ARG_SECTION_NUMBER), mCurrentPage, offset); isUpdating = true; } } } }); return rootView; } @Override public void onDetach() { super.onDetach(); mPresenter.detachView(); } @Override public void onDestroyView() { super.onDestroyView(); mUnbinder.unbind(); } @Override public void addData(List<TaskRealm> taskObjects) { mListEmpty.setVisibility(View.GONE); isUpdating = false; mAdapter.addTasks(taskObjects, this); mAdapter.notifyDataSetChanged(); } @Override public void getData(List<TaskRealm> taskObjects) { mListEmpty.setVisibility(View.GONE); isUpdating = false; mAdapter.setTasks(taskObjects, this); mAdapter.notifyDataSetChanged(); } @Override public void showEmpty() { mListEmpty.setText(getString(R.string.recyclerview_empty_text)); mListEmpty.setVisibility(View.VISIBLE); mAdapter.setTasks(null, null); mAdapter.notifyDataSetChanged(); } @Override public void showError() { mListEmpty.setVisibility(View.VISIBLE); mListEmpty.setText(R.string.fragment_error); } @Override public void showProgress(boolean isInProgress) { if (isInProgress) { mProgressBar.setVisibility(View.VISIBLE); } else { mSwipeRefreshLayout.setRefreshing(false); mProgressBar.setVisibility(View.GONE); } } @Override public void onItemClicked(TaskRealm item, View view) { Intent intent = new Intent(getContext(), DetailActivity.class); intent.putExtra(TaskRealm.TASK_EXTRA, item); intent.putExtra(TaskRealm.TASK_EXTRA_TITLE, String.valueOf(item.getId())); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { Pair pair = Pair.create(view.findViewById(R.id.task_item_card), view.findViewById(R.id.task_item_card).getTransitionName()); Bundle bundle = ActivityOptions.makeSceneTransitionAnimation(getActivity(), pair).toBundle(); startActivity(intent, bundle); } else { startActivity(intent); } } @Override public void requestUpdate() { mPresenter.fetchData(getArguments().getInt(ARG_SECTION_NUMBER), TaskRealm.QUERY_FIRST_PAGE, TaskRealm.QUERY_FIRST_PAGE); } /** * Helper method which is called from PagerActivity when press on TabLayout twice * Scrolls the screen to the top */ public void scrollToTop() { mRecyclerView.smoothScrollToPosition(0); } }