Java tutorial
/* * $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ * $ $ * $ _oo0oo_ $ * $ o8888888o $ * $ 88" . "88 $ * $ (| -_- |) $ * $ 0\ = /0 $ * $ ___/`-_-'\___ $ * $ .' \\| |$ '. $ * $ / \\||| : |||$ \ $ * $ / _||||| -:- |||||- \ $ * $ | | \\\ - $/ | | $ * $ | \_| ''\- -/'' |_/ | $ * $ \ .-\__ '-' ___/-. / $ * $ ___'. .' /-_._-\ `. .'___ $ * $ ."" '< `.___\_<|>_/___.' >' "". $ * $ | | : `- \`.;`\ _ /`;.`/ - ` : | | $ * $ \ \ `_. \_ __\ /__ _/ .-` / / $ * $ =====`-.____`.___ \_____/___.-`___.-'===== $ * $ `=-_-=' $ * $ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ $ * $ $ * $ Buddha Bless Never Bug $ * $ $ * $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ * * Copyright (C) 2016 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.jackie.sunshine.app; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ListView; import com.jackie.sunshine.app.data.WeatherContract; import com.jackie.sunshine.app.sync.SunshineSyncAdapter; /** * Created 16/11/21. * * @author Jackie * @version 1.0 */ public class ForecastFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final String TAG = "ForecastFragment"; private static final int FORECAST_LOADER_ID = 0x3e8; private static final String[] FORECAST_COLUMNS = { //In this case the id needs to be fully qualified with a table name, since //the content provider joins the location & weather tables in the background // (both have an _id column) // On one hand, that's annoying. On the other, You can search the weather table // using the location set by the user, which is only in the Location table. // So the convenience is worth it. WeatherContract.WeatherEntry.TABLE_NAME + "." + WeatherContract.WeatherEntry._ID, WeatherContract.WeatherEntry.COLUMN_DATE, WeatherContract.WeatherEntry.COLUMN_SHORT_DESC, WeatherContract.WeatherEntry.COLUMN_MAX_TEMP, WeatherContract.WeatherEntry.COLUMN_MIN_TEMP, WeatherContract.LocationEntry.COLUMN_LOCATION_SETTING, WeatherContract.WeatherEntry.COLUMN_WEATHER_ID, WeatherContract.LocationEntry.COLUMN_COORD_LAT, WeatherContract.LocationEntry.COLUMN_COORD_LONG }; // These indices are tied to FORECAST_COLUMNS. //If FORECAST_COLUMNS changes, these must change. static final int COL_WEATHER_ID = 0; static final int COL_WEATHER_DATE = 1; static final int COL_WEATHER_DESC = 2; static final int COL_WEATHER_MAX_TEMP = 3; static final int COL_WEATHER_MIN_TEMP = 4; static final int COL_LOCATION_SETTING = 5; static final int COL_WEATHER_CONDITION_ID = 6; static final int COL_COORD_LAT = 7; static final int COL_COORD_LONG = 8; public static final String EXTRA_POSITION = "position"; private ForecastAdapter mForecastAdapter; private ListView mListView; private int mPosition = ListView.INVALID_POSITION; private Callback callback; public ForecastFragment() { } @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Add this line in order for this fragment to handle menu events. setHasOptionsMenu(true); } /** * @param inflater * @param container * @param savedInstanceState * @return */ @Override public View onCreateView(final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); // Get a reference to the ListView, and attach this adapter to it. mListView = (ListView) rootView.findViewById(R.id.list_forecast); mForecastAdapter = new ForecastAdapter(getActivity(), null, 0); mListView.setAdapter(mForecastAdapter); mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Cursor cursor = (Cursor) parent.getItemAtPosition(position); if (cursor != null) { String locationSetting = Utility.getPreferredLocation(getContext()); Uri data = WeatherContract.WeatherEntry.buildWeatherLocationWithDate(locationSetting, cursor.getLong(COL_WEATHER_DATE)); callback.onItemSelected(data); Intent intent = new Intent(getActivity(), DetailActivity.class); intent.setData(data); startActivity(intent); } mPosition = position; } }); if (savedInstanceState != null && savedInstanceState.containsKey(EXTRA_POSITION)) { mPosition = savedInstanceState.getInt(EXTRA_POSITION); } return rootView; } public void setCallback(Callback callback) { this.callback = callback; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { getLoaderManager().initLoader(FORECAST_LOADER_ID, null, this); super.onActivityCreated(savedInstanceState); } @Override public void onStart() { super.onStart(); updateWeather(); } @Override public void onSaveInstanceState(Bundle outState) { if (mPosition != ListView.INVALID_POSITION) { outState.putInt(EXTRA_POSITION, mPosition); } super.onSaveInstanceState(outState); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.forecast_fragment, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_refresh: Log.d(TAG, "onOptionsItemSelected: selected action is refresh"); updateWeather(); return true; case R.id.action_map: openPreferredLocationMap(); return true; default: break; } return super.onOptionsItemSelected(item); } private void openPreferredLocationMap() { if (mForecastAdapter != null) { Cursor c = mForecastAdapter.getCursor(); String postLat = c.getString(COL_COORD_LAT); String postLong = c.getString(COL_COORD_LONG); Uri geoLocation = Uri.parse("geo:" + postLat + "," + postLong); Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(geoLocation); if (intent.resolveActivity(getActivity().getPackageManager()) != null) { startActivity(intent); } } } private void updateWeather() { SunshineSyncAdapter.syncImmediately(getContext()); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { String locationSetting = Utility.getPreferredLocation(getActivity()); // Sort order: Ascending, by date String sortOrder = WeatherContract.WeatherEntry.COLUMN_DATE + " ASC"; Uri weatherForLocationUri = WeatherContract.WeatherEntry.buildWeatherLocationWithStartDate(locationSetting, System.currentTimeMillis()); return new CursorLoader(getContext(), weatherForLocationUri, FORECAST_COLUMNS, null, null, sortOrder); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { mForecastAdapter.swapCursor(data); if (mPosition != ListView.INVALID_POSITION) { mListView.smoothScrollToPosition(mPosition); } } @Override public void onLoaderReset(Loader<Cursor> loader) { mForecastAdapter.swapCursor(null); } public void onLocationChange() { updateWeather(); getLoaderManager().restartLoader(FORECAST_LOADER_ID, null, this); } public void setUseTodayLayout(boolean useTodayLayout) { mForecastAdapter.setUserTodayLayout(useTodayLayout); } /** * A callback interface that all activities containing this fragment must * implement. This mechanism allows activities to be notified of item * selections. */ public interface Callback { /** * DetailFragmentCallback for when an item has been selected. */ void onItemSelected(Uri dateUri); } }