Java tutorial
/* * CardsFragment.java * * Copyright (C) 2012 Eric Butler * * Authors: * Eric Butler <eric@codebutler.com> * * This program 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 3 of the License, or * (at your option) any later version. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ package com.codebutler.farebot.fragments; import android.app.Activity; import android.content.ContentUris; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.CursorAdapter; import android.support.v4.widget.ResourceCursorAdapter; import android.text.ClipboardManager; import android.view.ContextMenu; import android.view.View; import android.widget.AdapterView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.actionbarsherlock.app.SherlockListFragment; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import com.codebutler.farebot.ExportHelper; import com.codebutler.farebot.R; import com.codebutler.farebot.Utils; import com.codebutler.farebot.card.Card; import com.codebutler.farebot.provider.CardDBHelper; import com.codebutler.farebot.provider.CardProvider; import com.codebutler.farebot.provider.CardsTableColumns; import com.codebutler.farebot.transit.TransitIdentity; import org.apache.commons.io.FileUtils; import java.io.File; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.Map; public class CardsFragment extends SherlockListFragment { private static final int REQUEST_SELECT_FILE = 1; private static final String SD_EXPORT_PATH = Environment.getExternalStorageDirectory() + "/FareBot-Export.xml"; private Map<String, TransitIdentity> mDataCache; private LoaderManager.LoaderCallbacks<Cursor> mLoaderCallbacks = new LoaderManager.LoaderCallbacks<android.database.Cursor>() { @Override public Loader<Cursor> onCreateLoader(int id, Bundle bundle) { return new CursorLoader(getActivity(), CardProvider.CONTENT_URI_CARD, CardDBHelper.PROJECTION, null, null, CardsTableColumns.SCANNED_AT + " DESC, " + CardsTableColumns._ID + " DESC"); } @Override public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) { if (getListAdapter() == null) { setListAdapter(new CardsAdapter()); setListShown(true); setEmptyText(getString(R.string.no_scanned_cards)); } ((CursorAdapter) getListAdapter()).swapCursor(cursor); } @Override public void onLoaderReset(Loader<Cursor> cursorLoader) { } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); mDataCache = new HashMap<String, TransitIdentity>(); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); registerForContextMenu(getListView()); getLoaderManager().initLoader(0, null, mLoaderCallbacks); } @Override public void onListItemClick(ListView l, View v, int position, long id) { Uri uri = ContentUris.withAppendedId(CardProvider.CONTENT_URI_CARD, id); startActivity(new Intent(Intent.ACTION_VIEW, uri)); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.cards_menu, menu); } @Override public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) { getActivity().getMenuInflater().inflate(R.menu.card_context_menu, menu); } @Override public boolean onContextItemSelected(android.view.MenuItem item) { if (item.getItemId() == R.id.delete_card) { long id = ((AdapterView.AdapterContextMenuInfo) item.getMenuInfo()).id; Uri uri = ContentUris.withAppendedId(CardProvider.CONTENT_URI_CARD, id); getActivity().getContentResolver().delete(uri, null, null); return true; } return false; } @Override public boolean onOptionsItemSelected(MenuItem item) { try { if (item.getItemId() == R.id.import_clipboard) { @SuppressWarnings("deprecation") ClipboardManager clipboard = (ClipboardManager) getActivity() .getSystemService(Activity.CLIPBOARD_SERVICE); onCardsImported(ExportHelper.importCardsXml(getActivity(), clipboard.getText().toString())); return true; } else if (item.getItemId() == R.id.import_file) { Uri uri = Uri.fromFile(Environment.getExternalStorageDirectory()); Intent i = new Intent(Intent.ACTION_GET_CONTENT); i.putExtra(Intent.EXTRA_STREAM, uri); i.setType("application/xml"); startActivityForResult(Intent.createChooser(i, "Select File"), REQUEST_SELECT_FILE); return true; } else if (item.getItemId() == R.id.import_sd) { String xml = FileUtils.readFileToString(new File(SD_EXPORT_PATH)); onCardsImported(ExportHelper.importCardsXml(getActivity(), xml)); return true; } else if (item.getItemId() == R.id.copy_xml) { @SuppressWarnings("deprecation") ClipboardManager clipboard = (ClipboardManager) getActivity() .getSystemService(Activity.CLIPBOARD_SERVICE); clipboard.setText(ExportHelper.exportCardsXml(getActivity())); Toast.makeText(getActivity(), "Copied to clipboard.", 5).show(); return true; } else if (item.getItemId() == R.id.share_xml) { Intent intent = new Intent(Intent.ACTION_SEND); intent.setType("text/plain"); intent.putExtra(Intent.EXTRA_TEXT, ExportHelper.exportCardsXml(getActivity())); startActivity(intent); return true; } else if (item.getItemId() == R.id.save_xml) { String xml = ExportHelper.exportCardsXml(getActivity()); File file = new File(SD_EXPORT_PATH); FileUtils.writeStringToFile(file, xml, "UTF-8"); Toast.makeText(getActivity(), "Wrote FareBot-Export.xml to USB Storage.", 5).show(); return true; } } catch (Exception ex) { Utils.showError(getActivity(), ex); } return false; } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { try { if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_SELECT_FILE) { Uri uri = data.getData(); String xml = org.apache.commons.io.FileUtils.readFileToString(new File(uri.getPath())); onCardsImported(ExportHelper.importCardsXml(getActivity(), xml)); } } catch (Exception ex) { Utils.showError(getActivity(), ex); } } private void onCardsImported(Uri[] uris) { ((CursorAdapter) ((ListView) getView().findViewById(android.R.id.list)).getAdapter()) .notifyDataSetChanged(); if (uris.length == 1) { Toast.makeText(getActivity(), "Card imported!", 5).show(); startActivity(new Intent(Intent.ACTION_VIEW, uris[0])); } else { Toast.makeText(getActivity(), "Cards Imported: " + uris.length, 5).show(); } } private class CardsAdapter extends ResourceCursorAdapter { public CardsAdapter() { super(getActivity(), android.R.layout.simple_list_item_2, null, false); } @Override public void bindView(View view, Context context, Cursor cursor) { int type = cursor.getInt(cursor.getColumnIndex(CardsTableColumns.TYPE)); String serial = cursor.getString(cursor.getColumnIndex(CardsTableColumns.TAG_SERIAL)); Date scannedAt = new Date(cursor.getLong(cursor.getColumnIndex(CardsTableColumns.SCANNED_AT))); String cacheKey = serial + scannedAt.getTime(); if (!mDataCache.containsKey(cacheKey)) { String data = cursor.getString(cursor.getColumnIndex(CardsTableColumns.DATA)); try { mDataCache.put(cacheKey, Card.fromXml(data).parseTransitIdentity()); } catch (Exception ex) { mDataCache.put(cacheKey, new TransitIdentity("Error: " + ex, null)); } } TransitIdentity identity = mDataCache.get(cacheKey); TextView textView1 = (TextView) view.findViewById(android.R.id.text1); TextView textView2 = (TextView) view.findViewById(android.R.id.text2); if (identity != null) { if (identity.getSerialNumber() != null) { textView1.setText(String.format("%s: %s", identity.getName(), identity.getSerialNumber())); } else { // textView1.setText(identity.getName()); textView1.setText(String.format("%s: %s", identity.getName(), serial)); } textView2.setText(getString(R.string.scanned_at_format, SimpleDateFormat.getTimeInstance(DateFormat.SHORT).format(scannedAt), SimpleDateFormat.getDateInstance(DateFormat.SHORT).format(scannedAt))); } else { textView1.setText(getString(R.string.unknown_card)); textView2.setText(String.format("%s - %s", Card.CardType.values()[type].toString(), serial)); } } @Override protected void onContentChanged() { super.onContentChanged(); mDataCache.clear(); } } }