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; import android.annotation.TargetApi; import android.app.ActivityOptions; import android.content.Intent; import android.content.SharedPreferences; import android.database.Cursor; import android.os.Build; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.view.ViewCompat; import android.support.v7.app.ActionBar; 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.ListView; import android.widget.TextView; import com.adkdevelopment.e_contact.adapters.ListViewAdapter; import com.adkdevelopment.e_contact.adapters.PagerAdapter; import com.adkdevelopment.e_contact.adapters.TasksAdapter; import com.adkdevelopment.e_contact.interfaces.OnAdapterClick; import com.adkdevelopment.e_contact.provider.tasks.TasksColumns; import com.adkdevelopment.e_contact.remote.TaskItem; import com.adkdevelopment.e_contact.utils.Utilities; import com.melnykov.fab.FloatingActionButton; import com.yalantis.phoenix.PullToRefreshView; import butterknife.BindView; import butterknife.ButterKnife; import butterknife.Unbinder; /** * Fragment with two adapters to show that I can handle both RecyclerView and ListView. * I didn't want to separate it in two different classes as they would've had too many repetitive code * Created by karataev on 4/8/16. */ public class TasksFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>, SharedPreferences.OnSharedPreferenceChangeListener, OnAdapterClick { // indices tied to the Tasks Columns, if they change - these must change public static final int COL_TASKS_ID = 0; public static final int COL_TASKS_TITLE = 13; public static final int COL_TASKS_TYPE = 3; public static final int COL_TASKS_STATUS = 2; public static final int COL_TASKS_CREATED = 7; public static final int COL_TASKS_REGISTERED = 8; public static final int COL_TASKS_ASSIGNED = 9; public static final int COL_TASKS_RESPONSIBLE = 6; public static final int COL_TASKS_DESCRIPTION = 4; public static final int COL_TASKS_LIKES = 12; public static final int COL_TASKS_ADDRESS = 5; private static final String ARG_SECTION_NUMBER = "section_number"; private static final int CURSOR_LOADER_ID = 0; private Cursor mCursor; private TasksAdapter mTasksAdapter; private ListViewAdapter mListViewAdapter; private LinearLayoutManager mLayoutManager; @BindView(R.id.recyclerview) RecyclerView mRecyclerView; @BindView(R.id.listview) ListView mListView; @BindView(R.id.swipe_refresh_layout) PullToRefreshView mSwipeRefreshLayout; @BindView(R.id.list_empty_text) TextView mListEmpty; Unbinder mUnbinder; public TasksFragment() { } /** * Returns a new instance of this fragment for the given section * number. */ public static TasksFragment newInstance(int sectionNumber) { TasksFragment fragment = new TasksFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); return fragment; } @Override public void onActivityCreated(Bundle savedInstanceState) { getLoaderManager().initLoader(CURSOR_LOADER_ID, this.getArguments(), this); super.onActivityCreated(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.tasks_layout, container, false); mUnbinder = ButterKnife.bind(this, rootView); // to reuse this fragment we check the argument and inflate corresponding view with an adapter if (getArguments().getInt(ARG_SECTION_NUMBER) == PagerAdapter.LISTVIEW_FRAGMENT) { initListViewAdapter(); } else { initRecyclerAdapter(); } mListEmpty.setVisibility(View.INVISIBLE); mSwipeRefreshLayout.setOnRefreshListener(new PullToRefreshView.OnRefreshListener() { @Override public void onRefresh() { if (Utilities.isOnline(getContext())) { mSwipeRefreshLayout.setRefreshing(false); // call PagerActivity to refetch data ((PagerActivity) getActivity()).fetchData(); } else { mSwipeRefreshLayout.setRefreshing(false); } } }); return rootView; } /** * Initializes Listview if pager is in corresponding view */ private void initListViewAdapter() { mRecyclerView.setVisibility(View.GONE); mListViewAdapter = new ListViewAdapter(getActivity(), mCursor, this); mListView.setAdapter(mListViewAdapter); // to allow FAB scrolling with the view ViewCompat.setNestedScrollingEnabled(mListView, true); if (getActivity() instanceof PagerActivity) { FloatingActionButton floatingActionButton = ((PagerActivity) getActivity()).getFab(); floatingActionButton.attachToListView(mListView); } } /** * Initializes RecyclerView if pager is in corresponding view */ private void initRecyclerAdapter() { mListView.setVisibility(View.GONE); mLayoutManager = new LinearLayoutManager(getContext(), RecyclerView.VERTICAL, false); mTasksAdapter = new TasksAdapter(getActivity(), mCursor, this); mRecyclerView.setHasFixedSize(true); mRecyclerView.setLayoutManager(mLayoutManager); mRecyclerView.setAdapter(mTasksAdapter); if (getActivity() instanceof PagerActivity) { FloatingActionButton floatingActionButton = ((PagerActivity) getActivity()).getFab(); floatingActionButton.attachToRecyclerView(mRecyclerView); } // Prevent Swipe to refresh if recyclerview isn't in top position mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { super.onScrollStateChanged(recyclerView, newState); int visible = mLayoutManager.findFirstCompletelyVisibleItemPosition(); if (mSwipeRefreshLayout != null) { if (visible != 0) { mSwipeRefreshLayout.setEnabled(false); } else { mSwipeRefreshLayout.setEnabled(true); } } } }); } @Override public void onDestroyView() { super.onDestroyView(); mUnbinder.unbind(); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { // depending on the argument - query the contentprovider to receive relevant data // that's how we can reuse this fragment for different purposes int request = args.getInt(ARG_SECTION_NUMBER); String statusArgument = String.valueOf(TaskItem.STATUS_ALL); switch (request) { case PagerAdapter.FRAGMENT_PROGRESS: statusArgument = String.valueOf(TaskItem.STATUS_PROGRESS); break; case PagerAdapter.FRAGMENT_COMPLETED: statusArgument = String.valueOf(TaskItem.STATUS_COMPLETED); break; case PagerAdapter.FRAGMENT_WAITING: statusArgument = String.valueOf(TaskItem.STATUS_WAITING); break; } String selection; String[] selectionArgs; int sortingPreference = Utilities.getSortingPreference(getContext()); if (sortingPreference == 0) { selection = TasksColumns.STATUS + " = ?"; selectionArgs = new String[] { statusArgument }; } else { selection = TasksColumns.STATUS + " = ? AND " + TasksColumns.TYPE + " = ?"; selectionArgs = new String[] { statusArgument, "" + sortingPreference }; } return new CursorLoader(getActivity(), TasksColumns.CONTENT_URI, null, selection, selectionArgs, null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { if (data == null || data.getCount() < 1) { mListEmpty.setVisibility(View.VISIBLE); } else { mListEmpty.setVisibility(View.INVISIBLE); } mCursor = data; if (mTasksAdapter != null) { mTasksAdapter.swapCursor(mCursor); } else if (mListViewAdapter != null) { mListViewAdapter.swapCursor(mCursor); } } @Override public void onLoaderReset(Loader<Cursor> loader) { mCursor = null; if (mTasksAdapter != null) { mTasksAdapter.swapCursor(null); } else if (mListViewAdapter != null) { mListViewAdapter.swapCursor(null); } } /** * Helper method which is called from PagerActivity when press on TabLayout twice * Scrolls the screen to the top */ public void scrollToTop() { if (mLayoutManager != null) { mRecyclerView.smoothScrollToPosition(0); } if (mListView != null) { // not the most elegant solution, but listview is a huuuge pain mListView.smoothScrollToPosition(0); mListView.setSelection(0); } } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { if (key.equals(getString(R.string.sharedprefs_key_sort))) { getLoaderManager().restartLoader(CURSOR_LOADER_ID, getArguments(), this); ActionBar actionBar = ((PagerActivity) getActivity()).getSupportActionBar(); if (actionBar != null) { actionBar.setTitle( Utilities.getActionbarTitle(getContext(), Utilities.getSortingPreference(getContext()))); } } } @Override public void onDestroy() { super.onDestroy(); PreferenceManager.getDefaultSharedPreferences(getContext()) .unregisterOnSharedPreferenceChangeListener(this); } @Override public void onResume() { super.onResume(); PreferenceManager.getDefaultSharedPreferences(getContext()).registerOnSharedPreferenceChangeListener(this); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) @Override public void onTaskClickTransition(TaskItem item, Pair<View, String> pair) { Intent intent = new Intent(getContext(), DetailActivity.class); intent.putExtra(TaskItem.TASKITEM, item); //noinspection unchecked always true Bundle bundle = ActivityOptions.makeSceneTransitionAnimation(getActivity(), pair).toBundle(); startActivity(intent, bundle); } @Override public void onTaskClick(TaskItem item) { Intent intent = new Intent(getContext(), DetailActivity.class); intent.putExtra(TaskItem.TASKITEM, item); startActivity(intent); } }