Java tutorial
/* This file is part of Fwknop2. Fwknop2 is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version. Foobar is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Foobar. If not, see <http://www.gnu.org/licenses/>. */ package biz.incomsystems.fwknop2; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.view.ContextMenu; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; import java.util.ArrayList; /** * A list fragment representing a list of . This fragment * also supports tablet devices by allowing list items to be given an * 'activated' state upon selection. This helps indicate which item is * currently being viewed in a {@link ConfigDetailFragment}. * <p/> * Activities containing this fragment MUST implement the {@link Callbacks} * interface. */ public class ConfigListFragment extends ListFragment { public ArrayAdapter customAdapter; private AdapterView.AdapterContextMenuInfo info; ArrayList array_list = new ArrayList(); DBHelper mydb; SendSPA OurSender; /** * The serialization (saved instance state) Bundle key representing the * activated item position. Only used on tablets. */ private static final String STATE_ACTIVATED_POSITION = "activated_position"; /** * The current activated item position. Only used on tablets. */ private int mActivatedPosition = ListView.INVALID_POSITION; /** * A callback interface that all activities containing this fragment must * implement. This mechanism allows activities to be notified of item * selections. */ public interface Callbacks { /** * Callback for when an item has been selected. */ // void onUpdate(); void onItemSelected(String id); } /** * A dummy implementation of the {@link Callbacks} interface that does * nothing. Used only when this fragment is not attached to an activity. */ private Callbacks sDummyCallbacks = new Callbacks() { @Override public void onItemSelected(String id) { } }; /** * The fragment's current callback object, which is notified of list item * clicks. */ private Callbacks mCallbacks = sDummyCallbacks; /** * Mandatory empty constructor for the fragment manager to instantiate the * fragment (e.g. upon screen orientation changes). */ public ConfigListFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); mydb = new DBHelper(getActivity()); array_list = mydb.getAllConfigs(); OurSender = new SendSPA(); customAdapter = new ArrayAdapter<ArrayList>(getActivity(), android.R.layout.simple_list_item_activated_1, android.R.id.text1, array_list); setListAdapter(customAdapter); } public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { // Inflate the menu; this adds items to the action bar if it is present. super.onCreateOptionsMenu(menu, inflater); inflater.inflate(R.menu.list_menu, menu); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); // Restore the previously serialized activated item position. if (savedInstanceState != null && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) { setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION)); } } public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.detail_help) { Intent detailIntent = new Intent(getActivity(), HelpActivity.class); startActivity(detailIntent); } else if (id == R.id.new_item) { Activity activity = getActivity(); ConfigListActivity myactivity = (ConfigListActivity) activity; if (myactivity.mTwoPane) { mCallbacks.onItemSelected(""); getListView().setItemChecked(mActivatedPosition, false); } else { Intent detailIntent = new Intent(getActivity(), ConfigDetailActivity.class); detailIntent.putExtra(ConfigDetailFragment.ARG_ITEM_ID, ""); startActivity(detailIntent); } } else { return false; } return true; } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); OurSender.onActivityResult(requestCode, resultCode, data); // have to call this manually as it isn't an activity class } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); registerForContextMenu(this.getListView()); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); MenuInflater inflater = this.getActivity().getMenuInflater(); inflater.inflate(R.menu.list_longtap_menu, menu); } @Override public boolean onContextItemSelected(MenuItem item) { customAdapter = (ArrayAdapter) getListAdapter(); info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); switch (item.getItemId()) { case R.id.delete: // Deleting the selected option AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setMessage("Are you sure?").setPositiveButton("Yes", dialogClickListener) .setNegativeButton("No", dialogClickListener).show(); return true; case R.id.knock: String nick = ((TextView) info.targetView).getText().toString(); OurSender.send(nick, getActivity()); default: return super.onContextItemSelected(item); } } public void onUpdate() { mydb = new DBHelper(getActivity()); array_list.clear(); array_list.addAll(mydb.getAllConfigs()); customAdapter.notifyDataSetChanged(); mydb.close(); } DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { switch (which) { case DialogInterface.BUTTON_POSITIVE: //Yes button clicked String nick = ((TextView) info.targetView).getText().toString(); mydb.deleteConfig(nick); array_list.remove(info.position); customAdapter.notifyDataSetChanged(); break; case DialogInterface.BUTTON_NEGATIVE: //No button clicked break; } } }; @Override public void onAttach(Activity activity) { super.onAttach(activity); mCallbacks = (Callbacks) activity; } @Override public void onDestroy() { super.onDestroy(); if (OurSender.isConnected) { OurSender.client.stop(getActivity()); } } @Override public void onDetach() { super.onDetach(); // Reset the active callbacks interface to the dummy implementation. mCallbacks = sDummyCallbacks; } @Override public void onListItemClick(ListView listView, View view, int position, long id) { super.onListItemClick(listView, view, position, id); mCallbacks.onItemSelected(this.getListAdapter().getItem(position).toString()); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (mActivatedPosition != ListView.INVALID_POSITION) { // Serialize and persist the activated item position. outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition); } } /** * Turns on activate-on-click mode. When this mode is on, list items will be * given the 'activated' state when touched. */ public void setActivateOnItemClick(boolean activateOnItemClick) { // When setting CHOICE_MODE_SINGLE, ListView will automatically // give items the 'activated' state when touched. getListView().setChoiceMode(activateOnItemClick ? ListView.CHOICE_MODE_SINGLE : ListView.CHOICE_MODE_NONE); } private void setActivatedPosition(int position) { if (position == ListView.INVALID_POSITION) { getListView().setItemChecked(mActivatedPosition, false); } else { getListView().setItemChecked(position, true); } mActivatedPosition = position; } }