Java tutorial
/* * MainActivity.java * * Copyright (C) 2011 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.activities; import android.app.ActionBar; import android.app.ListActivity; import android.app.LoaderManager; import android.app.PendingIntent; import android.content.*; import android.database.Cursor; import android.net.Uri; import android.nfc.NfcAdapter; import android.nfc.tech.IsoDep; import android.nfc.tech.MifareClassic; import android.nfc.tech.MifareUltralight; import android.nfc.tech.NfcF; import android.os.Bundle; import android.os.Environment; import android.text.ClipboardManager; import android.view.ContextMenu; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.*; import com.codebutler.farebot.ExportHelper; import com.codebutler.farebot.R; import com.codebutler.farebot.Utils; import com.codebutler.farebot.mifare.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 MainActivity extends ListActivity implements LoaderManager.LoaderCallbacks<Cursor> { private static final int SELECT_FILE = 1; private static final String SD_EXPORT_PATH = Environment.getExternalStorageDirectory() + "/FareBot-Export.xml"; private NfcAdapter mNfcAdapter; private PendingIntent mPendingIntent; private String[][] mTechLists; private Map<String, TransitIdentity> mDataCache; @Override protected void onCreate(Bundle bundle) { super.onCreate(bundle); setContentView(R.layout.activity_main); ActionBar actionBar = getActionBar(); actionBar.setHomeButtonEnabled(false); mDataCache = new HashMap<String, TransitIdentity>(); registerForContextMenu(getListView()); mNfcAdapter = NfcAdapter.getDefaultAdapter(this); Intent intent = new Intent(this, ReadingTagActivity.class); intent.addFlags( Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_NO_HISTORY); mPendingIntent = PendingIntent.getActivity(this, 0, intent, 0); mTechLists = new String[][] { new String[] { IsoDep.class.getName() }, new String[] { MifareClassic.class.getName() }, new String[] { MifareUltralight.class.getName() }, new String[] { NfcF.class.getName() } }; setListAdapter(new CardsAdapter()); getLoaderManager().initLoader(0, null, this); } @Override protected void onResume() { super.onResume(); mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, null, mTechLists); updateUI(); } @Override public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) { getMenuInflater().inflate(R.menu.card_context_menu, menu); } @Override public boolean onContextItemSelected(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); getContentResolver().delete(uri, null, null); return true; } return false; } public void onSupportedCardsClick(View view) { startActivity(new Intent(this, SupportedCardsActivity.class)); } @Override protected 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 boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { try { if (item.getItemId() == R.id.supported_cards) { startActivity(new Intent(this, SupportedCardsActivity.class)); return true; } else if (item.getItemId() == R.id.about) { startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://codebutler.github.com/farebot"))); return true; } else if (item.getItemId() == R.id.import_clipboard) { ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE); onCardsImported(ExportHelper.importCardsXml(this, 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"), SELECT_FILE); return true; } else if (item.getItemId() == R.id.import_sd) { String xml = FileUtils.readFileToString(new File(SD_EXPORT_PATH)); onCardsImported(ExportHelper.importCardsXml(this, xml)); return true; } else if (item.getItemId() == R.id.copy_xml) { ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE); clipboard.setText(ExportHelper.exportCardsXml(this)); Toast.makeText(this, "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(this)); startActivity(intent); return true; } else if (item.getItemId() == R.id.save_xml) { String xml = ExportHelper.exportCardsXml(this); File file = new File(SD_EXPORT_PATH); FileUtils.writeStringToFile(file, xml, "UTF-8"); Toast.makeText(this, "Wrote FareBot-Export.xml to USB Storage.", 5).show(); return true; } else if (item.getItemId() == R.id.prefs) { startActivity(new Intent(this, FareBotPreferenceActivity.class)); } } catch (Exception ex) { Utils.showError(this, ex); } return false; } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { try { if (resultCode == RESULT_OK && requestCode == SELECT_FILE) { Uri uri = data.getData(); String xml = org.apache.commons.io.FileUtils.readFileToString(new File(uri.getPath())); onCardsImported(ExportHelper.importCardsXml(this, xml)); } } catch (Exception ex) { Utils.showError(this, ex); } } private void onCardsImported(Uri[] uris) { ((ResourceCursorAdapter) getListAdapter()).notifyDataSetChanged(); if (uris.length == 1) { Toast.makeText(this, "Card imported!", 5).show(); startActivity(new Intent(Intent.ACTION_VIEW, uris[0])); } else { Toast.makeText(this, "Cards Imported: " + uris.length, 5).show(); } } private void updateUI() { if (((CursorAdapter) getListAdapter()).getCursor() == null) { findViewById(android.R.id.list).setVisibility(View.GONE); findViewById(R.id.no_cards).setVisibility(View.GONE); findViewById(R.id.loading).setVisibility(View.VISIBLE); } else if (getListAdapter().getCount() == 0) { findViewById(android.R.id.list).setVisibility(View.GONE); findViewById(R.id.no_cards).setVisibility(View.VISIBLE); findViewById(R.id.loading).setVisibility(View.GONE); } else { findViewById(android.R.id.list).setVisibility(View.VISIBLE); findViewById(R.id.no_cards).setVisibility(View.GONE); findViewById(R.id.loading).setVisibility(View.GONE); } } @Override public Loader<Cursor> onCreateLoader(int id, Bundle bundle) { return new CursorLoader(this, CardProvider.CONTENT_URI_CARD, CardDBHelper.PROJECTION, null, null, CardsTableColumns.SCANNED_AT + " DESC, " + CardsTableColumns._ID + " DESC"); } @Override public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) { ((CursorAdapter) getListAdapter()).swapCursor(cursor); updateUI(); } @Override public void onLoaderReset(Loader<Cursor> cursorLoader) { ((CursorAdapter) getListAdapter()).swapCursor(null); } private class CardsAdapter extends ResourceCursorAdapter { public CardsAdapter() { super(MainActivity.this, android.R.layout.simple_list_item_2, null); } @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))); if (!mDataCache.containsKey(serial)) { String data = cursor.getString(cursor.getColumnIndex(CardsTableColumns.DATA)); try { mDataCache.put(serial, Card.fromXml(data).parseTransitIdentity()); } catch (Exception ex) { mDataCache.put(serial, new TransitIdentity("Error: " + ex, null)); } } TransitIdentity identity = mDataCache.get(serial); 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(); updateUI(); } } }