2.01 add the Network Code

[edjata]

Well, I am very, very new to android development. So please don't laugh. I want to learn at my old age. Went through the Udacity Java class now I'm here. Got through all of part 1 with minimal issues. I even created a second string array in my app just to make sure I got it. yup it worked!! However, now I am stuck!!! After adding the networking code my app won't work. Everything looks right to me, but what do I know, lol. Hopefully someone out there can help me. This is day 3 trying to find out what I'm doing wrong.

MainActivity.java

package com.example.android.sunshine.app;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new MainActivityFragment.PlaceholderFragment())
                .commit();
    }

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@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();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}

MainActivityFragment.java

package com.example.android.sunshine.app;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**

• A placeholder fragment containing a simple view.
  */
  public class MainActivityFragment extends Fragment {

  public static class PlaceholderFragment extends Fragment{

  // Declaring Adapter

  ArrayAdapter mForcecastAdapter;

  public PlaceholderFragment() {
  }

  @OverRide

  //this is the onCreateView method for the placeholder fragment

  public View onCreateView(LayoutInflater inflater, ViewGroup container,
  Bundle savedInstanceState) {

   //Creates the String[] Array named dateForecastArray
  
   String[] dateForecastArray = {
           "Today - Sunny - 88/63",
           "Tomorrow - Foggy - 70/46",
           "Weds - Cloudy - 72/63",
           "Thurs - Rainy - 64/51",
           "Fri - Foggy - 70/46",
           "Sat - Sunny - 76/68",
           "Sun - Trapped in Heat - 105/99"
   };
  
   //Creates the String[] Array named oldDateForecastArray "My test"
  
   String[] oldDateForecastArray ={
           "Mon - Jan 1, 2017 - Cold/Snow - 15/3",
           "Tues - Jan 2, 2017 - Rain/Snow - 15/3",
           "Wed - Jan 3, 2017 - Cold - 15/3",
           "Thus - Jan 4, 2017 - Rain - 15/3",
           "Fri - Jan 5, 2017 - Icy Rain - 15/3",
           "Sat - Jan 6, 2017 - Cold - 15/3",
           "Sun - Jan 7, 2017 - Sunny/Cold - 15/3"
   };
  
   //calling the String Array
  
   List<String> weekForecast = new ArrayList<String>(
           Arrays.asList(oldDateForecastArray)
   );
  
   /**
    * initializing Adapter:
    * create ArrayAdapter<String>:
   * mForcecastAdapter = new ArrayAdapter<String>
   *
   *Parameters:
   *    context: getActivity()
   *
   *    --**NOTE: "context" contains global information about the app environment
   *    -*       It allows us to access system services and resources
   *    -*       As well as the application specific resources we define
   *
   *    ID of list item layout: R.layout.list_item_forecast
   *    --**Note: "R.layout" refers to a layout file
   *
   *    ID of text view: R.id.list_item_forecast_textview
   *    --**Note: "R.id" refers to a specific XML element with the matching id attribute
   *
   *    list of data: weekForecast
   *    --**Note: The array list of forecast defined
    */
  
   mForcecastAdapter =
           new ArrayAdapter<String> (
                   //The current context (the fragment's parent activity)
                   getActivity(),
                   //ID of list item layout
                   R.layout.list_item_forecast,
                   //ID of textview to populate
                   R.id.list_item_forecast_textview,
                   //forecast data
                   weekForecast);
   //inflated rootView
   View rootView = inflater.inflate(R.layout.fragment_main, container, false);
  
   //Create reference to listview find by ID
   /**
    * View hierarchy: example
    * tier 1:                [Relative Layout] id:root
    *                                   /    \
    * tier 2: [Linear Layout] id:container,  [Button] id:btn
    *             /           \
    * t3: [image] no id,  [TextView] id:txt
    *
    * java code:
    *      Button b = (Button)this.findViewById(R.id.btn);
    *      LinearLayout container = (LinearLayout)this.findViewById(R.id.container)
    *      TextView t = (TextView)container.findViewById(R.id.txt);
    */
  
   //Get a reference to the ListView. rootView here refers to rootView of the fragment inflated above
   ListView listView = (ListView) rootView.findViewById(R.id.listview_forecast);
  
   //binding adapter to listView
   listView.setAdapter(mForcecastAdapter);
  
  
  
   // These two need to be declared outside the try/catch
   // so that they can be closed in the finally block.
   HttpURLConnection urlConnection = null;
   BufferedReader reader = null;
  
   // Will contain the raw JSON response as a string.
   String forecastJsonStr = null;
  
   try {
       // Construct the URL for the OpenWeatherMap query
       // Possible parameters are avaiable at OWM's forecast API page, at
       // http://openweathermap.org/API#forecast
       URL url = new URL("http://api.openweathermap.org/data/2.5/forecast/daily?q=30034&mode=json&units=metric&cnt=7&APPID=c67f4ffaa108e5944910a9d3795aad9e");
  
       // Create the request to OpenWeatherMap, and open the connection
       urlConnection = (HttpURLConnection) url.openConnection();
       urlConnection.setRequestMethod("GET");
       urlConnection.connect();
  
       // Read the input stream into a String
       InputStream inputStream = urlConnection.getInputStream();
       StringBuffer buffer = new StringBuffer();
       if (inputStream == null) {
           // Nothing to do.
           return null;
       }
       reader = new BufferedReader(new InputStreamReader(inputStream));
  
       String line;
       while ((line = reader.readLine()) != null) {
           // Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
           // But it does make debugging a *lot* easier if you print out the completed
           // buffer for debugging.
           buffer.append(line + "\n");
       }
  
       if (buffer.length() == 0) {
           // Stream was empty.  No point in parsing.
           return null;
       }
       forecastJsonStr = buffer.toString();
   } catch (IOException e) {
       Log.e("PlaceholderFragment", "Error ", e);
       // If the code didn't successfully get the weather data, there's no point in attemping
       // to parse it.
       return null;
   } finally{
       if (urlConnection != null) {
           urlConnection.disconnect();
       }
       if (reader != null) {
           try {
               reader.close();
           } catch (final IOException e) {
               Log.e("PlaceholderFragment", "Error closing stream", e);
           }
       }
   }
  
   return rootView;
  

  }

  }

}

[khaledafify]

check this
https://www.youtube.com/watch?v=f17qe9vZ8RM&feature=youtu.be&t=18m10s