Tuesday, March 27, 2012

Get Google Weather

It's another online weather info provided by Google:
http://www.google.com/ig/api?hl=en&weather=new%20york

Similar to Yahoo! Weather. It return weather information in XML format. It's a example to get New York weather from Google.

Get Google Weather

package com.exercise.AndroidGoogleWeather;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidGoogleWeatherActivity extends Activity {

class CurrentConditions{
String condition;
String temp_f;
String temp_c;
String humidity;
String icon;
String wind_condition;
}

class ForecastConditions{
String day_of_week;
String low;
String high;
String icon;
String condition;
}

CurrentConditions currentConditions;
List<ForecastConditions> forecastConditionsList;

TextView tvCurrentConditions;


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvCurrentConditions = (TextView)findViewById(R.id.currentconditions);

String weatherString = QueryGoogleWeather();
Document weatherDoc = convertStringToDocument(weatherString);
parseGoogleWeather(weatherDoc);

//Display Result
String s = "\n"
+ currentConditions.condition + "\n"
+ currentConditions.temp_f + "\n"
+ currentConditions.temp_c + "\n"
+ currentConditions.humidity + "\n"
+ currentConditions.icon + "\n"
+ currentConditions.wind_condition + "\n";

for(int k=0; k < 4; k++){
s += "\n"
+ forecastConditionsList.get(k).condition + "\n"
+ forecastConditionsList.get(k).day_of_week + "\n"
+ forecastConditionsList.get(k).low + "\n"
+ forecastConditionsList.get(k).high + "\n"
+ forecastConditionsList.get(k).icon + "\n";
}

tvCurrentConditions.setText(s);

}

private void parseGoogleWeather(Document srcDoc){

currentConditions = new CurrentConditions();

//-- Get current_conditions
NodeList current_conditions = srcDoc.getElementsByTagName("current_conditions");
NodeList currentChilds = current_conditions.item(0).getChildNodes();

for(int i=0; i<currentChilds.getLength(); i++){
Node n = currentChilds.item(i);

String nName = n.getNodeName();
String nValue
= n.getAttributes().getNamedItem("data").getNodeValue().toString();
if (nName.equalsIgnoreCase("condition")){
currentConditions.condition = nValue;
}else if((nName.equalsIgnoreCase("temp_f"))){
currentConditions.temp_f = nValue;
}else if((nName.equalsIgnoreCase("temp_c"))){
currentConditions.temp_c = nValue;
}else if((nName.equalsIgnoreCase("humidity"))){
currentConditions.humidity = nValue;
}else if((nName.equalsIgnoreCase("icon"))){
currentConditions.icon = nValue;
}else if((nName.equalsIgnoreCase("wind_condition"))){
currentConditions.wind_condition = nValue;
}
}

//-- Get forecast_conditions
NodeList forecast_conditions = srcDoc.getElementsByTagName("forecast_conditions");
int forecast_conditions_length = forecast_conditions.getLength();

forecastConditionsList = new ArrayList<ForecastConditions>();

for(int j=0; j<forecast_conditions_length; j++){

ForecastConditions tmpForecastConditions = new ForecastConditions();

NodeList forecasrChilds = forecast_conditions.item(j).getChildNodes();

for(int i=0; i<forecasrChilds.getLength(); i++){

Node n = forecasrChilds.item(i);

String nName = n.getNodeName();
String nValue
= n.getAttributes().getNamedItem("data").getNodeValue().toString();

if (nName.equalsIgnoreCase("condition")){
tmpForecastConditions.condition = nValue;
}else if((nName.equalsIgnoreCase("day_of_week"))){
tmpForecastConditions.day_of_week = nValue;
}else if((nName.equalsIgnoreCase("low"))){
tmpForecastConditions.low = nValue;
}else if((nName.equalsIgnoreCase("high"))){
tmpForecastConditions.high = nValue;
}else if((nName.equalsIgnoreCase("icon"))){
tmpForecastConditions.icon = nValue;
}

}

forecastConditionsList.add(tmpForecastConditions);

}


}

private Document convertStringToDocument(String src){
Document dest = null;

DocumentBuilderFactory dbFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder parser;

try {
parser = dbFactory.newDocumentBuilder();
dest = parser.parse(new ByteArrayInputStream(src.getBytes()));
} catch (ParserConfigurationException e1) {
e1.printStackTrace();
Toast.makeText(AndroidGoogleWeatherActivity.this,
e1.toString(), Toast.LENGTH_LONG).show();
} catch (SAXException e) {
e.printStackTrace();
Toast.makeText(AndroidGoogleWeatherActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(AndroidGoogleWeatherActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
}

return dest;
}

private String QueryGoogleWeather(){
String qResult = "";
String queryString = "http://www.google.com/ig/api?hl=en&weather=new%20york";

HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(queryString);

try {
HttpEntity httpEntity = httpClient.execute(httpGet).getEntity();

if (httpEntity != null){
InputStream inputStream = httpEntity.getContent();
Reader in = new InputStreamReader(inputStream);
BufferedReader bufferedreader = new BufferedReader(in);
StringBuilder stringBuilder = new StringBuilder();

String stringReadLine = null;

while ((stringReadLine = bufferedreader.readLine()) != null) {
stringBuilder.append(stringReadLine + "\n");
}

qResult = stringBuilder.toString();
}

} catch (ClientProtocolException e) {
e.printStackTrace();
Toast.makeText(AndroidGoogleWeatherActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(AndroidGoogleWeatherActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
}

return qResult;
}
}


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/currentconditions"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</ScrollView>
</LinearLayout>


You have to modify AndroidManifest.xml to grand permission of "android.permission.INTERNET"

Download the files.

Next:
- Google Weather App

Related:
- Get weather info from Yahoo! Weather RSS Feed.
- Get description from Yahoo! Weather RSS feed, and display in WebView.

3 comments:

SyedHashim said...

I try to run this on the emulator. This always crashes before starting. Any suggestion ?

Android Er said...

hello SyedHashim,

What minSdkVersion you set, is it crash caused by android.os.NetworkOnMainThreadException ?

Try to set minSdkVersion lower than 9.

SyedHashim said...

I tried to change the minSDK. It worked great. Thanks :)