Java tutorial
/* * Copyright 2011 Google Inc. * * 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.heneryh.aquanotes.ui; import com.heneryh.aquanotes.R; import com.heneryh.aquanotes.provider.AquaNotesDbContract; import com.heneryh.aquanotes.provider.AquaNotesDbContract.Controllers; import com.heneryh.aquanotes.util.ActivityHelper; import com.heneryh.aquanotes.util.AnalyticsUtils; import com.heneryh.aquanotes.util.NotifyingAsyncQueryHandler; import android.content.Context; import android.content.Intent; import android.database.ContentObserver; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.os.Handler; import android.provider.BaseColumns; import android.support.v4.app.Fragment; import android.support.v4.app.ListFragment; import android.text.Spannable; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.CursorAdapter; import android.widget.ListView; import android.widget.TextView; import static com.heneryh.aquanotes.util.UIUtils.buildStyledSnippet; /** * A {@link ListFragment} showing a list of sandbox comapnies. */ public class DbMaintOutletsFragment extends ListFragment implements NotifyingAsyncQueryHandler.AsyncQueryListener { private static final String STATE_CHECKED_POSITION = "checkedPosition"; private Uri mTrackUri; private Cursor mCursor; private CursorAdapter mAdapter; private int mCheckedPosition = -1; private boolean mHasSetEmptyText = false; int mNum; private NotifyingAsyncQueryHandler mHandler; /** * Create a new instance of CountingFragment, providing "num" * as an argument. */ static DbMaintOutletsFragment newInstance(int num) { DbMaintOutletsFragment f = new DbMaintOutletsFragment(); // Supply num input as an argument. Bundle args = new Bundle(); args.putInt("num", num); f.setArguments(args); return f; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mNum = getArguments() != null ? getArguments().getInt("num") : 1; mHandler = new NotifyingAsyncQueryHandler(getActivity().getContentResolver(), this); reloadFromArguments(getArguments()); } // /** // * The Fragment's UI is xxx. // */ // @Override // public View onCreateView(LayoutInflater inflater, ViewGroup container, // Bundle savedInstanceState) { // View v = inflater.inflate(R.id.fragment_controllers, container, false); // View tv = v.findViewById(R.id.text); // ((TextView)tv).setText("Fragment #" + mNum); // tv.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.gallery_thumb)); // return v; // } public void reloadFromArguments(Bundle arguments) { // Teardown from previous arguments if (mCursor != null) { getActivity().stopManagingCursor(mCursor); mCursor = null; } mCheckedPosition = -1; setListAdapter(null); mHandler.cancelOperation(SearchQuery._TOKEN); mHandler.cancelOperation(ControllersQuery._TOKEN); // Load new arguments final Intent intent = BaseActivity.fragmentArgumentsToIntent(arguments); //final Uri controllersUri = intent.getData(); final int controllerQueryToken; final Uri controllersUri = Controllers.CONTENT_URI; // not gettting from intent if (controllersUri == null) { return; } String[] projection; if (!AquaNotesDbContract.Vendors.isSearchUri(controllersUri)) { mAdapter = new ControllersAdapter(getActivity()); projection = ControllersQuery.PROJECTION; controllerQueryToken = ControllersQuery._TOKEN; } else { Log.d("DbMaintOutletsFragment/reloadFromArguments", "A search URL definitely gets passed in."); mAdapter = new SearchAdapter(getActivity()); projection = SearchQuery.PROJECTION; controllerQueryToken = SearchQuery._TOKEN; } setListAdapter(mAdapter); // Start background query to load controllers mHandler.startQuery(controllerQueryToken, null, controllersUri, projection, null, null, AquaNotesDbContract.Controllers.DEFAULT_SORT); // If caller launched us with specific track hint, pass it along when // launching vendor details. Also start a query to load the track info. mTrackUri = intent.getParcelableExtra(SessionDetailFragment.EXTRA_TRACK); if (mTrackUri != null) { mHandler.startQuery(TracksQuery._TOKEN, mTrackUri, TracksQuery.PROJECTION); } } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); if (savedInstanceState != null) { mCheckedPosition = savedInstanceState.getInt(STATE_CHECKED_POSITION, -1); } if (!mHasSetEmptyText) { // Could be a bug, but calling this twice makes it become visible when it shouldn't // be visible. setEmptyText(getString(R.string.empty_controllers)); mHasSetEmptyText = true; } } /** {@inheritDoc} */ public void onQueryComplete(int token, Object cookie, Cursor cursor) { if (getActivity() == null) { return; } if (token == ControllersQuery._TOKEN || token == SearchQuery._TOKEN) { onControllersOrSearchQueryComplete(cursor); } else if (token == TracksQuery._TOKEN) { //onTrackQueryComplete(cursor); } else { cursor.close(); } } /** * Handle {@link VendorsQuery} {@link Cursor}. */ private void onControllersOrSearchQueryComplete(Cursor cursor) { if (mCursor != null) { // In case cancelOperation() doesn't work and we end up with consecutive calls to this // callback. getActivity().stopManagingCursor(mCursor); mCursor = null; } // TODO(romannurik): stopManagingCursor on detach (throughout app) mCursor = cursor; getActivity().startManagingCursor(mCursor); mAdapter.changeCursor(mCursor); if (mCheckedPosition >= 0 && getView() != null) { getListView().setItemChecked(mCheckedPosition, true); } } // /** // * Handle {@link TracksQuery} {@link Cursor}. // */ // private void onTrackQueryComplete(Cursor cursor) { // try { // if (!cursor.moveToFirst()) { // return; // } // // // Use found track to build title-bar // ActivityHelper activityHelper = ((BaseActivity) getActivity()).getActivityHelper(); // String trackName = cursor.getString(TracksQuery.TRACK_NAME); // activityHelper.setActionBarTitle(trackName); // activityHelper.setActionBarColor(cursor.getInt(TracksQuery.TRACK_COLOR)); // // AnalyticsUtils.getInstance(getActivity()).trackPageView("/Sandbox/Track/" + trackName); // // } finally { // cursor.close(); // } // } // @Override public void onResume() { super.onResume(); getActivity().getContentResolver().registerContentObserver(AquaNotesDbContract.Vendors.CONTENT_URI, true, mControllerChangesObserver); if (mCursor != null) { mCursor.requery(); } } @Override public void onPause() { super.onPause(); getActivity().getContentResolver().unregisterContentObserver(mControllerChangesObserver); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(STATE_CHECKED_POSITION, mCheckedPosition); } /** {@inheritDoc} */ @Override public void onListItemClick(ListView l, View v, int position, long id) { // Launch viewer for specific vendor. final Cursor cursor = (Cursor) mAdapter.getItem(position); final String vendorId = cursor.getString(VendorsQuery.VENDOR_ID); final Uri vendorUri = AquaNotesDbContract.Vendors.buildVendorUri(vendorId); ((BaseActivity) getActivity()).openActivityOrFragment(new Intent(Intent.ACTION_VIEW, vendorUri)); getListView().setItemChecked(position, true); mCheckedPosition = position; } public void clearCheckedPosition() { if (mCheckedPosition >= 0) { getListView().setItemChecked(mCheckedPosition, false); mCheckedPosition = -1; } } /** * {@link CursorAdapter} that renders a {@link VendorsQuery}. */ private class ControllersAdapter extends CursorAdapter { public ControllersAdapter(Context context) { super(context, null); } /** {@inheritDoc} */ @Override public View newView(Context context, Cursor cursor, ViewGroup parent) { return getActivity().getLayoutInflater().inflate(R.layout.list_item_controller, parent, false); } /** {@inheritDoc} */ @Override public void bindView(View view, Context context, Cursor cursor) { String debugtest = cursor.getString(ControllersQuery.TITLE); ((TextView) view.findViewById(R.id.controller_name)).setText(debugtest); String debugtest2 = cursor.getString(ControllersQuery.WAN_URL); String debugtest3 = cursor.getString(ControllersQuery.LAN_URL); String debugtest4 = debugtest2 + " \n" + debugtest3; ((TextView) view.findViewById(R.id.controller_urls)).setText(debugtest4); final boolean starred = false; /*cursor.getInt(VendorsQuery.STARRED) != 0;*/ view.findViewById(R.id.star_button).setVisibility(starred ? View.VISIBLE : View.INVISIBLE); } } /** * {@link CursorAdapter} that renders a {@link SearchQuery}. */ private class SearchAdapter extends CursorAdapter { public SearchAdapter(Context context) { super(context, null); } /** {@inheritDoc} */ @Override public View newView(Context context, Cursor cursor, ViewGroup parent) { return getActivity().getLayoutInflater().inflate(R.layout.list_item_controller, parent, false); } /** {@inheritDoc} */ @Override public void bindView(View view, Context context, Cursor cursor) { ((TextView) view.findViewById(R.id.controller_name)).setText(cursor.getString(SearchQuery.NAME)); final String snippet = cursor.getString(SearchQuery.SEARCH_SNIPPET); final Spannable styledSnippet = buildStyledSnippet(snippet); ((TextView) view.findViewById(R.id.controller_urls)).setText(styledSnippet); final boolean starred = cursor.getInt(VendorsQuery.STARRED) != 0; view.findViewById(R.id.star_button).setVisibility(starred ? View.VISIBLE : View.INVISIBLE); } } private ContentObserver mControllerChangesObserver = new ContentObserver(new Handler()) { @Override public void onChange(boolean selfChange) { if (mCursor != null) { mCursor.requery(); } } }; /** * {@link com.heneryh.aquanotes.provider.AquaNotesDbContract.Vendors} query parameters. */ private interface VendorsQuery { int _TOKEN = 0x1; String[] PROJECTION = { BaseColumns._ID, AquaNotesDbContract.Vendors.VENDOR_ID, AquaNotesDbContract.Vendors.VENDOR_NAME, AquaNotesDbContract.Vendors.VENDOR_LOCATION, AquaNotesDbContract.Vendors.VENDOR_STARRED, }; int _ID = 0; int VENDOR_ID = 1; int NAME = 2; int LOCATION = 3; int STARRED = 4; } /** * {@link com.heneryh.aquanotes.provider.AquaNotesDbContract.Tracks} query parameters. */ private interface TracksQuery { int _TOKEN = 0x2; String[] PROJECTION = { AquaNotesDbContract.Tracks.TRACK_NAME, AquaNotesDbContract.Tracks.TRACK_COLOR, }; int TRACK_NAME = 0; int TRACK_COLOR = 1; } /** {@link com.heneryh.aquanotes.provider.AquaNotesDbContract.Vendors} search query * parameters. */ private interface SearchQuery { int _TOKEN = 0x3; String[] PROJECTION = { BaseColumns._ID, AquaNotesDbContract.Vendors.VENDOR_ID, AquaNotesDbContract.Vendors.VENDOR_NAME, AquaNotesDbContract.Vendors.SEARCH_SNIPPET, AquaNotesDbContract.Vendors.VENDOR_STARRED, }; int _ID = 0; int VENDOR_ID = 1; int NAME = 2; int SEARCH_SNIPPET = 3; int STARRED = 4; } private interface ControllersQuery { int _TOKEN = 0x4; String[] PROJECTION = { // String CONTROLLER_ID = "_id"; // String TITLE = "title"; // String WAN_URL = "wan_url"; // String LAN_URL = "wifi_url"; // String WIFI_SSID = "wifi_ssid"; // String USER = "user"; // String PW = "pw"; // String LAST_UPDATED = "last_updated"; // String UPDATE_INTERVAL = "update_i"; // String DB_SAVE_DAYS = "db_save_days"; // String CONTROLLER_TYPE = "controller_type"; BaseColumns._ID, AquaNotesDbContract.Controllers.TITLE, AquaNotesDbContract.Controllers.WAN_URL, AquaNotesDbContract.Controllers.LAN_URL, AquaNotesDbContract.Controllers.WIFI_SSID, AquaNotesDbContract.Controllers.USER, AquaNotesDbContract.Controllers.PW, AquaNotesDbContract.Controllers.LAST_UPDATED, AquaNotesDbContract.Controllers.UPDATE_INTERVAL, AquaNotesDbContract.Controllers.DB_SAVE_DAYS, AquaNotesDbContract.Controllers.MODEL, }; int _ID = 0; int TITLE = 1; int WAN_URL = 2; int LAN_URL = 3; int WIFI_SSID = 4; int USER = 5; int PW = 6; int LAST_UPDATED = 7; int UPDATE_INTERVAL = 8; int DB_SAVE_DAYS = 9; int MODEL = 10; } }