This assignemnt for Android development using Java Weather Forecaster App Goal:

Question

This assignemnt for Android development using Java

Weather Forecaster App

Goal: Create an app to display a weather forecast for the user’s current location

Create the app titled Weather Forecaster

The first screen will have a textbox for the user to enter a zip code and a button to submit

When the user enters the zip code and clicks the button, the app will navigate to the weather forecast screen.

The weather forecast screen will show the current weather for the user’s location in a label

Input validation for the zip code (only valid zip codes should be accepted)

Display a listview/tableview of the forecast for the next 7 days

Display images for the forecast (eg: clouds for cloudy weather, a sun for clear weather)

Get the weather using an async task

Use the user’s current location from the device GPS (for this functionality, the app does not need the zip code entry in the first screen)

Cache the data for offline use so the user can see the forecast even in airplane mode

Some publicly available weather APIs (any API is acceptable):

http://openweathermap.org/api

https://developer.yahoo.com/weather/

http://graphical.weather.gov/xml/

Explanation / Answer

import android.app.Activity; import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.GridView; import android.widget.ProgressBar; import android.widget.SimpleAdapter; import android.widget.TextView; import android.widget.Toast; import com.android.nazirshuqair.simpleweather.model.Weather; import com.android.nazirshuqair.simpleweather.parser.WeatherJSONParser; import com.android.nazirshuqair.simpleweather.textViewHelper.AutoResizeTextView; import com.loopj.android.image.SmartImageView; import org.json.JSONArray; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import butterknife.ButterKnife; import butterknife.InjectView; import butterknife.OnClick; public class MainActivity extends Activity { //Debugging Tag final String TAG = "Simple Weather Log: "; final String DAY = "day"; final String TEXT = "text"; final String HIGH = "high"; final String LOW = "low"; ProgressBar pb; List weatherList; @InjectView(R.id.zipEntry) EditText zipEntry; @InjectView(R.id.cityRegion)AutoResizeTextView cityRegion; @InjectView(R.id.tempLabel) TextView tempLabel; @InjectView(R.id.tempTextLabel) AutoResizeTextView tempTextLabel; @OnClick(R.id.updateButton)void runRequest(){ String apiUrlPart1 = "https://query.yahooapis.com/v1/public/yql?q=SELECT%20*%20FROM%20weather.forecast%20WHERE%20location%3D%22"; String apiUrlPart2 = "%22&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback="; String fullURL = apiUrlPart1 + zipEntry.getText().toString() + apiUrlPart2; if (zipEntry.getText().length() > 5){ Toast.makeText(this, "Please enter a valid Zip Code", Toast.LENGTH_LONG).show(); }else if (zipEntry.getText().length() < 5){ Toast.makeText(this, "Please enter a valid Zip Code", Toast.LENGTH_LONG).show(); }else { Log.i(TAG, fullURL); if (isOnline()){ requestData(fullURL); }else { Toast.makeText(this, "No network", Toast.LENGTH_LONG).show(); } } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pb = (ProgressBar) findViewById(R.id.progressBar1); pb.setVisibility(View.INVISIBLE); //myImage = (SmartImageView) this.findViewById(R.id.testImage); //myImage.setImageUrl("http://www.sr-tour.com/LostLandSinai/style/images/weather.png"); ButterKnife.inject(this); } private void requestData(String uri){ MyTask myTask = new MyTask(); myTask.execute(uri); } // Update all ui elements protected void updateDisplay(){ if (weatherList != null){ for (Weather weather : weatherList){ //will output some text for testing here cityRegion.setText(weather.getCity() + ", " + weather.getRegion()); cityRegion.resizeText(); tempLabel.setText(String.valueOf(weather.getTemperature())); tempTextLabel.setText(weather.getTempText()); tempTextLabel.resizeText(); populateListView(weather); } } } protected boolean isOnline(){ ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getActiveNetworkInfo(); if (netInfo != null && netInfo.isConnectedOrConnecting()){ return true; }else { return false; } } private class MyTask extends AsyncTask { @Override protected void onPreExecute(){ //updateDisplay pb.setVisibility(View.VISIBLE); } @Override protected String doInBackground(String... params){ String content = HttpManager.getData(params[0]); return content; } @Override protected void onPostExecute(String result){ pb.setVisibility(View.INVISIBLE); Log.i(TAG, result); if (result == null){ Toast.makeText(MainActivity.this, "Can't Connect", Toast.LENGTH_LONG).show(); return; } weatherList = WeatherJSONParser.parseFeed(result); if (weatherList == null){ Toast.makeText(MainActivity.this, "Zip code is Invalid!", Toast.LENGTH_LONG).show(); } updateDisplay(); } @Override protected void onProgressUpdate(String... values){ } } private void populateListView(Weather weather) { JSONArray forcastOutput = weather.getForecastJSON(); // List of elements in our adapter ArrayList mForecastList = new ArrayList(); // Goes through each site and maps the data elements to a String key for (int i = 0; i

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