Java tutorial
/* * Copyright (C) 2013 Jorrit "Chainfire" Jongma * * 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 eu.chainfire.geolog.ui; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import eu.chainfire.geolog.Debug; import eu.chainfire.geolog.R; import eu.chainfire.geolog.data.Database; import eu.chainfire.geolog.data.LogsProvider; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.database.Cursor; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.content.LocalBroadcastManager; import android.support.v4.widget.CursorAdapter; import android.text.Html; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class LogsFragment extends ListFragment implements LoaderCallbacks<Cursor> { static final int INTERNAL_EMPTY_ID = 0x00ff0001; static final int INTERNAL_PROGRESS_CONTAINER_ID = 0x00ff0002; static final int INTERNAL_LIST_CONTAINER_ID = 0x00ff0003; private class ViewHolder { public View container = null; public TextView time = null; public TextView activity = null; public TextView location = null; } private static final int LIST_LOADER = 1; private CursorAdapter adapter; private volatile boolean metric = true; private SharedPreferences prefs; private View mainView; private View progressContainer; private View listContainer; private View internalEmpty; private boolean isShown = false; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mainView = inflater.inflate(R.layout.fragment_logs, container, false); progressContainer = mainView.findViewById(R.id.progressContainer); //progressContainer.setId(INTERNAL_PROGRESS_CONTAINER_ID); listContainer = mainView.findViewById(R.id.listContainer); listContainer.setId(INTERNAL_LIST_CONTAINER_ID); internalEmpty = mainView.findViewById(R.id.internalEmpty); internalEmpty.setId(INTERNAL_EMPTY_ID); return mainView; } private BroadcastReceiver preferenceReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Debug.log("Preferences updated !"); metric = !prefs.getString(SettingsFragment.PREF_UNITS, SettingsFragment.PREF_UNITS_DEFAULT) .equals(SettingsFragment.VALUE_UNITS_IMPERIAL); try { getListView().invalidateViews(); } catch (Exception e) { } } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); prefs = PreferenceManager.getDefaultSharedPreferences(getActivity()); metric = !prefs.getString(SettingsFragment.PREF_UNITS, SettingsFragment.PREF_UNITS_DEFAULT) .equals(SettingsFragment.VALUE_UNITS_IMPERIAL); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { LocalBroadcastManager.getInstance(getActivity()).registerReceiver(preferenceReceiver, new IntentFilter(SettingsFragment.NOTIFY_BROADCAST)); getListView().setSelector(android.R.color.transparent); setEmptyText(getResources().getString(R.string.logs_empty)); setListShown(false); getLoaderManager().initLoader(LIST_LOADER, null, this); adapter = new CursorAdapter(getActivity(), null, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER) { private LayoutInflater inflater = null; private Database.Location location = null; private String formatTime = null; private String formatActivity = null; private String formatLocation = null; private String formatBattery = null; private boolean lastMetric = true; private SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSZ", Locale.ENGLISH); @Override public View newView(Context context, Cursor cursor, ViewGroup root) { if (inflater == null) inflater = LayoutInflater.from(context); return inflater.inflate(R.layout.row_logs, null); } @SuppressWarnings("deprecation") @Override public void bindView(View view, Context context, Cursor cursor) { ViewHolder holder = (ViewHolder) view.getTag(); if (holder == null) { holder = new ViewHolder(); holder.container = view.findViewById(R.id.container); holder.time = (TextView) view.findViewById(R.id.time); holder.activity = (TextView) view.findViewById(R.id.activity); holder.location = (TextView) view.findViewById(R.id.location); view.setTag(holder); } if (location == null) location = new Database.Location(); location.loadFromCursor(cursor); if (formatTime == null) formatTime = context.getString(R.string.row_logs_time); if (formatActivity == null) formatActivity = context.getString(R.string.row_logs_activity); if (formatBattery == null) formatBattery = context.getString(R.string.row_logs_battery); if ((formatLocation == null) || (metric != lastMetric)) { if (metric) { formatLocation = context.getString(R.string.row_logs_location_metric); } else { formatLocation = context.getString(R.string.row_logs_location_imperial); } lastMetric = metric; } float accuracy = location.getAccuracyDistance(); if (!metric) accuracy *= SettingsFragment.METER_FEET_RATIO; if (location.isSegmentStart()) { holder.container.setBackgroundColor(0xFFa8dff4); } else { holder.container.setBackgroundDrawable(null); } holder.time.setText(Html.fromHtml(String.format(Locale.ENGLISH, formatTime, simpleDateFormat.format(new Date(location.getTime()))))); holder.activity.setText(Html.fromHtml(String.format(Locale.ENGLISH, formatActivity, Database.activityToString(location.getActivity()), location.getConfidence()) + " " + String.format(Locale.ENGLISH, formatBattery, (location.getBattery() > 100) ? location.getBattery() - 100 : location.getBattery(), (location.getBattery() > 100) ? "+" : ""))); holder.location.setText(Html.fromHtml(String.format(Locale.ENGLISH, formatLocation, location.getLatitude(), location.getLongitude(), accuracy))); } }; setListAdapter(adapter); } @Override public void onDestroyView() { LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(preferenceReceiver); super.onDestroyView(); } @Override public void setListShown(boolean shown) { isShown = shown; listContainer.setVisibility(isShown ? View.VISIBLE : View.GONE); progressContainer.setVisibility(isShown ? View.GONE : View.VISIBLE); } @Override public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) { CursorLoader cursorLoader = new CursorLoader(getActivity(), LogsProvider.CONTENT_URI, null, null, null, Database.Location._ID + " DESC"); return cursorLoader; } @Override public void onLoadFinished(Loader<Cursor> arg0, Cursor arg1) { adapter.swapCursor(arg1); setListShown(true); } @Override public void onLoaderReset(Loader<Cursor> arg0) { adapter.swapCursor(null); setListShown(false); } }