Java tutorial
/* * Copyright (c) 2016. Veera Siva Sri Aditya Katam * * 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.katamaditya.apps.weather4u; import android.content.Intent; import android.content.SharedPreferences; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.preference.PreferenceManager; 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.support.v4.widget.SwipeRefreshLayout; 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.google.android.gms.ads.AdListener; import com.google.android.gms.ads.AdRequest; import com.google.android.gms.ads.InterstitialAd; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.GoogleApiAvailability; import com.katamaditya.apps.weather4u.weatherdata.WeatherContract; import com.katamaditya.apps.weather4u.weathersync.Weather4USyncAdapter; /** * Created by VeeraSivaSriAditya on 6/28/2016. */ public class WeatherForecastFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>, SwipeRefreshLayout.OnRefreshListener { public static final String LOG_TAG = WeatherForecastFragment.class.getSimpleName(); public static final String PREF_ENABLE_COLOR_CHANGE_KEY = "enable_color_change";// careful when // u change, this used in strings.xml public static final Integer ADS_DEFAULT = 0; public static final Integer ADS_CLICK_LIMIT = 5; // 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; private static final String SELECTED_KEY = "selected_position"; private static final int FORECAST_LOADER = 0; // For the forecast view we're showing only a small subset of the stored data. // Specify the columns we need. 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 the 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 }; private SwipeRefreshLayout mSwipeRefreshLayout; private WeatherForecastAdapter mWeatherForecastAdapter; private SharedPreferences.OnSharedPreferenceChangeListener mPreferenceChangeListener; private ListView mListView; private int mPosition = ListView.INVALID_POSITION; private boolean mUseTodayLayout; private InterstitialAd mInterstitialAd; public WeatherForecastFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Add this line in order for this fragment to handle menu events. setHasOptionsMenu(true); //Following code sets up a listener for the change color with weather setting and notifies // the Forecast Adapter accordingly SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getContext()); mPreferenceChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() { public void onSharedPreferenceChanged(SharedPreferences prefs, String key) { if (key.equals(PREF_ENABLE_COLOR_CHANGE_KEY)) { mWeatherForecastAdapter.notifyDataSetChanged(); } } }; preferences.registerOnSharedPreferenceChangeListener(mPreferenceChangeListener); mInterstitialAd = new InterstitialAd(getActivity()); mInterstitialAd.setAdUnitId("ca-app-pub-3940256099942544/1033173712"); mInterstitialAd.setAdListener(new AdListener() { @Override public void onAdClosed() { requestNewInterstitial(); } }); requestNewInterstitial(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // The ForecastAdapter will take data from a source and // use it to populate the ListView it's attached to. mWeatherForecastAdapter = new WeatherForecastAdapter(getActivity(), null, 0); View rootView = inflater.inflate(R.layout.fragment_main, container, false); mSwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipeRefreshLayout); // Get a reference to the ListView, and attach this adapter to it. mListView = (ListView) rootView.findViewById(R.id.listview_forecast); mListView.setAdapter(mWeatherForecastAdapter); // We'll call our MainActivity mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) { // CursorAdapter returns a cursor at the correct position for getItem(), or null // if it cannot seek to that position. Cursor cursor = (Cursor) adapterView.getItemAtPosition(position); if (cursor != null) { String locationSetting = WeatherUtil.getPreferredLocation(getActivity()); ((Callback) getActivity()).onItemSelected(WeatherContract.WeatherEntry .buildWeatherLocationWithDate(locationSetting, cursor.getLong(COL_WEATHER_DATE))); } mPosition = position; } }); // If there's instance state, mine it for useful information. // The end-goal here is that the user never knows that turning their device sideways // does crazy lifecycle related things. It should feel like some stuff stretched out, // or magically appeared to take advantage of room, but data or place in the app was never // actually *lost*. if (savedInstanceState != null && savedInstanceState.containsKey(SELECTED_KEY)) { // The listview probably hasn't even been populated yet. Actually perform the // swapout in onLoadFinished. mPosition = savedInstanceState.getInt(SELECTED_KEY); } mWeatherForecastAdapter.setUseTodayLayout(mUseTodayLayout); return rootView; } @Override public void onActivityCreated(Bundle savedInstanceState) { getLoaderManager().initLoader(FORECAST_LOADER, null, this); super.onActivityCreated(savedInstanceState); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); mSwipeRefreshLayout.setColorSchemeResources(R.color.refresh_progress_1, R.color.refresh_progress_2, R.color.refresh_progress_3, R.color.refresh_progress_4, R.color.refresh_progress_5); mSwipeRefreshLayout.setOnRefreshListener(this); } @Override public void onResume() { super.onResume(); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext()); int nthclick = prefs.getInt(getContext().getString(R.string.ads_key), ADS_DEFAULT); boolean isPlayServicesValid = checkPlayServices(); SharedPreferences.Editor editor = prefs.edit(); if (nthclick >= ADS_CLICK_LIMIT) { if (isPlayServicesValid) { if (mInterstitialAd.isLoaded()) { mInterstitialAd.show(); } editor.putInt(getContext().getString(R.string.ads_key), 0); } } else { editor.putInt(getContext().getString(R.string.ads_key), nthclick + 1); } editor.commit(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.menu_weather_forecast_fragment, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_refresh) { updateWeather(); return true; } if (id == R.id.action_map) { openPreferredLocationInMap(); return true; } return super.onOptionsItemSelected(item); } @Override public void onSaveInstanceState(Bundle outState) { // When tablets rotate, the currently selected list item needs to be saved. // When no item is selected, mPosition will be set to Listview.INVALID_POSITION, // so check for that before storing. if (mPosition != ListView.INVALID_POSITION) { outState.putInt(SELECTED_KEY, mPosition); } super.onSaveInstanceState(outState); } @Override public Loader<Cursor> onCreateLoader(int i, Bundle bundle) { // This is called when a new Loader needs to be created. This // fragment only uses one loader, so we don't care about checking the id. // To only show current and future dates, filter the query to return weather only for // dates after or including today. // Sort order: Ascending, by date. String sortOrder = WeatherContract.WeatherEntry.COLUMN_DATE + " ASC"; String locationSetting = WeatherUtil.getPreferredLocation(getActivity()); Uri weatherForLocationUri = WeatherContract.WeatherEntry.buildWeatherLocationWithStartDate(locationSetting, System.currentTimeMillis()); return new CursorLoader(getActivity(), weatherForLocationUri, FORECAST_COLUMNS, null, null, sortOrder); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { mWeatherForecastAdapter.swapCursor(data); if (mPosition != ListView.INVALID_POSITION) { // If we don't need to restart the loader, and there's a desired position to restore // to, do so now. mListView.smoothScrollToPosition(mPosition); } } @Override public void onLoaderReset(Loader<Cursor> loader) { mWeatherForecastAdapter.swapCursor(null); } @Override public void onRefresh() { updateWeather(); mSwipeRefreshLayout.setRefreshing(false); } // since we read the location when we create the loader, all we need to do is restart things void onLocationChanged() { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext()); String oldNotificationFrequency = prefs.getString(getContext().getString(R.string.pref_notification_key), getString(R.string.pref_notification_eighthours)); SharedPreferences.Editor editor = prefs.edit(); editor.putString(getContext().getString(R.string.pref_notification_old_key), oldNotificationFrequency); editor.putString(getContext().getString(R.string.pref_notification_key), "now"); editor.commit(); updateWeather(); getLoaderManager().restartLoader(FORECAST_LOADER, null, this); } private void updateWeather() { Weather4USyncAdapter.syncImmediately(getActivity()); } private void openPreferredLocationInMap() { // Using the URI scheme for showing a location found on a map. This super-handy // intent can is detailed in the "Common Intents" page of Android's developer site: // http://developer.android.com/guide/components/intents-common.html#Maps if (null != mWeatherForecastAdapter) { Cursor c = mWeatherForecastAdapter.getCursor(); if (null != c) { c.moveToPosition(0); String posLat = c.getString(COL_COORD_LAT); String posLong = c.getString(COL_COORD_LONG); Uri geoLocation = Uri.parse("geo:" + posLat + "," + posLong); Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(geoLocation); if (intent.resolveActivity(getActivity().getPackageManager()) != null) { startActivity(intent); } /*else { Log.d(LOG_TAG, "Couldn't call " + geoLocation.toString() + ", no receiving apps installed!"); }*/ } } } public void setUseTodayLayout(boolean useTodayLayout) { mUseTodayLayout = useTodayLayout; if (mWeatherForecastAdapter != null) { mWeatherForecastAdapter.setUseTodayLayout(mUseTodayLayout); } } private void requestNewInterstitial() { AdRequest adRequest = new AdRequest.Builder().build(); mInterstitialAd.loadAd(adRequest); } private boolean checkPlayServices() { GoogleApiAvailability googleAPI = GoogleApiAvailability.getInstance(); int result = googleAPI.isGooglePlayServicesAvailable(getContext()); if (result != ConnectionResult.SUCCESS) { return false; } return true; } /** * 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. */ public void onItemSelected(Uri dateUri); } }