/***
Copyright (c) 2013-2015 CommonsWare, LLC
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.
Covered in detail in the book _The Busy Coder's Guide to Android Development_
https://commonsware.com/Android
*/
package com.commonsware.android.weather3;
import android.app.ListFragment;
import android.content.IntentSender;
import android.location.Location;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationSettingsRequest;
import com.google.android.gms.location.LocationSettingsResult;
import com.google.android.gms.location.LocationSettingsStatusCodes;
import com.squareup.picasso.Picasso;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
public class WeatherFragment extends ListFragment implements
ResultCallback<LocationSettingsResult>,
LocationListener {
static final int SETTINGS_REQUEST_ID=1338;
private String template=null;
private LocationRequest request=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
template=getActivity().getString(R.string.url);
request=new LocationRequest()
.setNumUpdates(1)
.setExpirationDuration(60000)
.setInterval(1000)
.setPriority(LocationRequest.PRIORITY_LOW_POWER);
}
@Override
public void onPause() {
LocationServices.FusedLocationApi.removeLocationUpdates(
getPlayServices(), this);
super.onPause();
}
@Override
public void onViewCreated(View view,
Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
requestSettings();
}
@Override
public void onResult(LocationSettingsResult result) {
boolean thingsPlumbBusted=true;
switch(result.getStatus().getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
requestLocations();
thingsPlumbBusted=false;
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
try {
result
.getStatus()
.startResolutionForResult(getActivity(),
SETTINGS_REQUEST_ID);
thingsPlumbBusted=false;
}
catch (IntentSender.SendIntentException e) {
// oops
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// more oops
break;
}
if (thingsPlumbBusted) {
Toast
.makeText(getActivity(),
R.string.settings_resolution_fail_msg,
Toast.LENGTH_LONG)
.show();
getActivity().finish();
}
}
@Override
public void onLocationChanged(Location location) {
new FetchForecastTask()
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, location);
}
private GoogleApiClient getPlayServices() {
return(((WeatherDemo)getActivity()).getPlayServices());
}
private void requestSettings() {
LocationSettingsRequest.Builder b=
new LocationSettingsRequest.Builder()
.addLocationRequest(request);
PendingResult<LocationSettingsResult> result=
LocationServices.SettingsApi.checkLocationSettings(getPlayServices(),
b.build());
result.setResultCallback(this);
}
void requestLocations() {
PendingResult<Status> result=
LocationServices.FusedLocationApi
.requestLocationUpdates(getPlayServices(), request, this);
result.setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(Status status) {
if (status.isSuccess()) {
Toast
.makeText(getActivity(),
R.string.location_req_success_msg,
Toast.LENGTH_LONG)
.show();
} else {
Toast
.makeText(getActivity(), status.getStatusMessage(),
Toast.LENGTH_LONG)
.show();
getActivity().finish();
}
}
});
}
private String getForecastXML(String path) throws IOException {
BufferedReader reader=null;
URL url=new URL(path);
HttpURLConnection c=(HttpURLConnection)url.openConnection();
try {
reader=
new BufferedReader(new InputStreamReader(c.getInputStream()));
StringBuilder buf=new StringBuilder();
String line=null;
while ((line=reader.readLine()) != null) {
buf.append(line);
buf.append('\n');
}
return(buf.toString());
}
finally {
if (reader != null) {
reader.close();
}
c.disconnect();
}
}
private ArrayList<Forecast> buildForecasts(String raw)
throws Exception {
ArrayList<Forecast> forecasts=new ArrayList<Forecast>();
DocumentBuilder builder=
DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc=builder.parse(new InputSource(new StringReader(raw)));
NodeList times=doc.getElementsByTagName("start-valid-time");
for (int i=0; i < times.getLength(); i++) {
Element time=(Element)times.item(i);
Forecast forecast=new Forecast();
forecasts.add(forecast);
forecast.setTime(time.getFirstChild().getNodeValue());
}
NodeList temps=doc.getElementsByTagName("value");
for (int i=0; i < temps.getLength(); i++) {
Element temp=(Element)temps.item(i);
Forecast forecast=forecasts.get(i);
forecast.setTemp(Integer.valueOf(temp.getFirstChild()
.getNodeValue()));
}
NodeList icons=doc.getElementsByTagName("icon-link");
for (int i=0; i < icons.getLength(); i++) {
Element icon=(Element)icons.item(i);
Forecast forecast=forecasts.get(i);
forecast.setIcon(icon.getFirstChild().getNodeValue());
}
return(forecasts);
}
private class FetchForecastTask extends AsyncTask<Location, Void, List<Forecast>> {
private Exception e=null;
@Override
protected List<Forecast> doInBackground(Location... locs) {
try {
Location loc=locs[0];
String url=
String.format(template, loc.getLatitude(),
loc.getLongitude());
return(buildForecasts(getForecastXML(url)));
}
catch (Exception e) {
this.e=e;
}
return(null);
}
@Override
protected void onPostExecute(List<Forecast> forecasts) {
if (e == null) {
setListAdapter(new ForecastAdapter(forecasts));
}
else {
Log.e(getClass().getSimpleName(), "Exception fetching data", e);
Toast.makeText(getActivity(),
String.format(getString(R.string.error),
e.toString()), Toast.LENGTH_LONG)
.show();
}
}
}
private class ForecastAdapter extends ArrayAdapter<Forecast> {
int size;
ForecastAdapter(List<Forecast> items) {
super(getActivity(), R.layout.row, R.id.date, items);
size=
getActivity().getResources()
.getDimensionPixelSize(R.dimen.icon);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row=super.getView(position, convertView, parent);
Forecast item=getItem(position);
ImageView icon=(ImageView)row.findViewById(R.id.icon);
Picasso.with(getActivity()).load(item.getIcon())
.resize(size, size).centerCrop().into(icon);
TextView title=(TextView)row.findViewById(R.id.date);
title.setText(item.getTime());
TextView temp=(TextView)row.findViewById(R.id.temp);
temp.setText("Temperature: "+String.valueOf(item.getTemp())+"F");
return(row);
}
}
}