Java tutorial
/* * Author: Scott Ware <scoot.software@gmail.com> * Copyright (c) 2015 Scott Ware * * 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.scooter1556.sms.android.fragment; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.support.v7.preference.PreferenceManager; import android.view.ActionMode; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.ListView; import com.scooter1556.sms.android.R; import com.scooter1556.sms.android.adapter.ConnectionListAdapter; import com.scooter1556.sms.android.database.ConnectionDatabase; import com.scooter1556.sms.android.domain.Connection; import java.util.List; public class ConnectionFragment extends ListFragment { private static final String TAG = "ConnectionFragment"; private ConnectionFragment.ConnectionListener connectionListener; // Stores preferences for the application SharedPreferences sharedPreferences; private List<Connection> connectionList; private ConnectionListAdapter connectionListAdapter; private ConnectionDatabase db; public ConnectionFragment() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Retrieve preferences if they exist sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity().getApplicationContext()); // Initialisation db = new ConnectionDatabase(getActivity().getApplicationContext()); connectionList = db.getAllConnections(); connectionListAdapter = new ConnectionListAdapter(getActivity().getBaseContext(), connectionList); // Set default connection connectionListAdapter.setCheckedItemID(sharedPreferences.getLong("Connection", -1)); // Action Bar setHasOptionsMenu(true); // Retain this fragment across configuration changes. setRetainInstance(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Set the adapter setListAdapter(connectionListAdapter); return super.onCreateView(inflater, container, savedInstanceState); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { setEmptyText(getString(R.string.connections_empty)); getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { public boolean onItemLongClick(AdapterView parent, View view, int position, long id) { getListView().startActionMode(actionModeCallBack); parent.requestFocusFromTouch(); parent.setSelected(true); connectionListAdapter.setSelectedItemID(id); return true; } }); } @Override public void onAttach(Context context) { super.onAttach(context); try { connectionListener = (ConnectionFragment.ConnectionListener) context; } catch (ClassCastException e) { throw new ClassCastException(context.toString() + " must implement ConnectionListener"); } } @Override public void onDetach() { super.onDetach(); connectionListener = null; } @Override public void onResume() { super.onResume(); updateConnectionList(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.menu_connections, menu); } @Override public void onListItemClick(ListView l, View v, int position, long id) { if (sharedPreferences.getLong("Connection", -1) != id) { // Update list connectionListAdapter.setCheckedItemID(id); connectionListAdapter.notifyDataSetChanged(); // Update preferences SharedPreferences.Editor editor = sharedPreferences.edit(); editor.putLong("Connection", id).apply(); } } private ActionMode.Callback actionModeCallBack = new ActionMode.Callback() { @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { mode.setTitle(R.string.connections_action_mode_title); mode.getMenuInflater().inflate(R.menu.menu_connections_context, menu); return true; } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { int id = item.getItemId(); switch (id) { case R.id.edit_connection: connectionListener.EditConnection(connectionListAdapter.getSelectedItemID()); mode.finish(); break; case R.id.remove_connection: db.deleteConnection(connectionListAdapter.getSelectedItemID()); if (sharedPreferences.getLong("Connection", -1) == connectionListAdapter.getSelectedItemID()) { // Update preferences SharedPreferences.Editor editor = sharedPreferences.edit(); editor.putLong("Connection", -1).apply(); connectionListAdapter.setCheckedItemID(-1); } updateConnectionList(); mode.finish(); break; default: return false; } return true; } @Override public void onDestroyActionMode(ActionMode mode) { connectionListAdapter.setSelectedItemID(-1); } }; @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.add_connection: connectionListener.AddConnection(); return true; default: return super.onOptionsItemSelected(item); } } public void updateConnectionList() { connectionList = db.getAllConnections(); connectionListAdapter.setItemList(connectionList); connectionListAdapter.notifyDataSetChanged(); } /** * This interface must be implemented by activities that contain this * fragment to allow an interaction in this fragment to be communicated * to the activity and potentially other fragments contained in that * activity. */ public interface ConnectionListener { void AddConnection(); void EditConnection(long id); void SaveConnection(Connection connection); } }