Java tutorial
/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.xandy.calendar.selectcalendars; import android.accounts.Account; import android.app.Activity; import android.content.ContentResolver; import android.content.ContentUris; import android.content.ContentValues; import android.content.Intent; import android.content.res.Resources; import android.database.ContentObserver; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.os.Handler; import android.provider.CalendarContract; import android.provider.CalendarContract.Calendars; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ListAdapter; import android.widget.TextView; import com.xandy.calendar.AsyncQueryService; import com.xandy.calendar.R; import com.xandy.calendar.Utils; import java.util.HashMap; public class SelectCalendarsSyncFragment extends ListFragment implements View.OnClickListener, LoaderManager.LoaderCallbacks<Cursor> { private static final String TAG = "SelectCalendarSync"; private static final String COLLATE_NOCASE = " COLLATE NOCASE"; private static final String SELECTION = Calendars.ACCOUNT_NAME + "=? AND " + Calendars.ACCOUNT_TYPE + "=?"; // is primary lets us sort the user's main calendar to the top of the list private static final String IS_PRIMARY = "\"primary\""; private static final String SORT_ORDER = IS_PRIMARY + " DESC," + Calendars.CALENDAR_DISPLAY_NAME + COLLATE_NOCASE; private static final String[] PROJECTION = new String[] { Calendars._ID, Calendars.CALENDAR_DISPLAY_NAME, Calendars.CALENDAR_COLOR, Calendars.SYNC_EVENTS, Calendars.ACCOUNT_NAME, Calendars.ACCOUNT_TYPE, "(" + Calendars.ACCOUNT_NAME + "=" + Calendars.OWNER_ACCOUNT + ") AS " + IS_PRIMARY, }; private TextView mSyncStatus; private Button mAccountsButton; private Account mAccount; private final String[] mArgs = new String[2]; private AsyncQueryService mService; private Handler mHandler = new Handler(); private ContentObserver mCalendarsObserver = new ContentObserver(mHandler) { @Override public void onChange(boolean selfChange) { // We don't need our own sync changes to trigger refreshes. if (!selfChange) { getLoaderManager().initLoader(0, null, SelectCalendarsSyncFragment.this); } } }; public SelectCalendarsSyncFragment() { } public SelectCalendarsSyncFragment(Bundle bundle) { mAccount = new Account(bundle.getString(Calendars.ACCOUNT_NAME), bundle.getString(Calendars.ACCOUNT_TYPE)); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.account_calendars, null); mSyncStatus = (TextView) v.findViewById(R.id.account_status); mSyncStatus.setVisibility(View.GONE); mAccountsButton = (Button) v.findViewById(R.id.sync_settings); mAccountsButton.setVisibility(View.GONE); mAccountsButton.setOnClickListener(this); return v; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Give some text to display if there is no data. In a real // application this would come from a resource. setEmptyText(getActivity().getText(R.string.no_syncable_calendars)); // Prepare the loader. Either re-connect with an existing one, // or start a new one. getLoaderManager().initLoader(0, null, this); } @Override public void onResume() { super.onResume(); if (!ContentResolver.getMasterSyncAutomatically() || !ContentResolver.getSyncAutomatically(mAccount, CalendarContract.AUTHORITY)) { Resources res = getActivity().getResources(); mSyncStatus.setText(res.getString(R.string.acct_not_synced)); mSyncStatus.setVisibility(View.VISIBLE); mAccountsButton.setText(res.getString(R.string.accounts)); mAccountsButton.setVisibility(View.VISIBLE); } else { mSyncStatus.setVisibility(View.GONE); mAccountsButton.setVisibility(View.GONE); // Start a background sync to get the list of calendars from the server. Utils.startCalendarMetafeedSync(mAccount); getActivity().getContentResolver().registerContentObserver(Calendars.CONTENT_URI, true, mCalendarsObserver); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); mService = new AsyncQueryService(activity); Bundle bundle = getArguments(); if (bundle != null && bundle.containsKey(Calendars.ACCOUNT_NAME) && bundle.containsKey(Calendars.ACCOUNT_TYPE)) { mAccount = new Account(bundle.getString(Calendars.ACCOUNT_NAME), bundle.getString(Calendars.ACCOUNT_TYPE)); } } @Override public void onPause() { final ListAdapter listAdapter = getListAdapter(); if (listAdapter != null) { HashMap<Long, SelectCalendarsSyncAdapter.CalendarRow> changes = ((SelectCalendarsSyncAdapter) listAdapter) .getChanges(); if (changes != null && changes.size() > 0) { for (SelectCalendarsSyncAdapter.CalendarRow row : changes.values()) { if (row.synced == row.originalSynced) { continue; } long id = row.id; mService.cancelOperation((int) id); // Use the full long id in case it makes a difference Uri uri = ContentUris.withAppendedId(Calendars.CONTENT_URI, row.id); ContentValues values = new ContentValues(); // Toggle the current setting int synced = row.synced ? 1 : 0; values.put(Calendars.SYNC_EVENTS, synced); values.put(Calendars.VISIBLE, synced); mService.startUpdate((int) id, null, uri, values, null, null, 0); } changes.clear(); } } getActivity().getContentResolver().unregisterContentObserver(mCalendarsObserver); super.onPause(); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { mArgs[0] = mAccount.name; mArgs[1] = mAccount.type; return new CursorLoader(getActivity(), Calendars.CONTENT_URI, PROJECTION, SELECTION, mArgs, SORT_ORDER); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { SelectCalendarsSyncAdapter adapter = (SelectCalendarsSyncAdapter) getListAdapter(); if (adapter == null) { adapter = new SelectCalendarsSyncAdapter(getActivity(), data, getFragmentManager()); setListAdapter(adapter); } else { adapter.changeCursor(data); } getListView().setOnItemClickListener(adapter); } public void onLoaderReset(Loader<Cursor> loader) { setListAdapter(null); } // Called when the Accounts button is pressed. Takes the user to the // Accounts and Sync settings page. @Override public void onClick(View v) { Intent intent = new Intent(); intent.setAction("android.settings.SYNC_SETTINGS"); getActivity().startActivity(intent); } }