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Android Build a Blog Reader Android App Adapting Data for Display in a List Filling Our String Array and Creating the Adapter

Monzer Selim
PLUS
Monzer Selim
Courses Plus Student 3,849 Points
Posted by Monzer Selim
Monzer Selim
Courses Plus Student 3,849 Points

Blog data is not showing after writing exact code in the tutorial

here is my code copy .... plz check what is wrong with it :

package com.blogspot.monapps.blogreader;

import android.app.AlertDialog; import android.app.ListActivity; import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.AsyncTask; import android.os.Bundle; import android.text.Html; import android.util.Log; import android.widget.ArrayAdapter; import android.widget.Toast;

import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject;

import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL;

public class MainListActivity extends ListActivity {

protected String[] mBlogPostTitles;
public static final int NUMBER_OF_POSTS = 20;
public static final String TAG = MainListActivity.class.getSimpleName();
protected JSONObject mBlogData;


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

    if (isNetworkAvailable()) {
        GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
        getBlogPostsTask.execute();
    }
    else {
        Toast.makeText(this,"Network is unavailable",Toast.LENGTH_LONG).show();
    }


    //Toast.makeText(this , getString(R.string.no_items) ,Toast.LENGTH_LONG).show();
}

private boolean isNetworkAvailable() {
    ConnectivityManager manager = (ConnectivityManager)
            getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = manager.getActiveNetworkInfo();

    boolean isAvailable = false;
    if (networkInfo !=null && networkInfo.isConnected()) {
        isAvailable = true;
    }
    return isAvailable;

} public void updateList() { if (mBlogData == null){ AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle(getString(R.string.error_title)); builder.setMessage(getString(R.string.error_message)); builder.setPositiveButton(android.R.string.ok , null); AlertDialog dialog = builder.create(); dialog.show(); } else{ try { JSONArray jsonPosts = mBlogData.getJSONArray("posts"); mBlogPostTitles = new String[jsonPosts.length()]; for (int i = 0 ; i<jsonPosts.length();i++){ JSONObject post = jsonPosts.getJSONObject(i); String title = post.getString("title"); title = Html.fromHtml(title).toString(); mBlogPostTitles [i] = title;} ArrayAdapter<String> adapter = new ArrayAdapter<String>(this , android.R.layout.simple_list_item_1, mBlogPostTitles); setListAdapter(adapter); } catch (JSONException e) { Log.e(TAG, "Exception Caught!", e); } } }

private class GetBlogPostsTask extends AsyncTask {

   @Override
   protected JSONObject doInBackground(Object... objects) {
       int responseCode = -1;
       JSONObject jsonResponse = null;
       try {
           URL blogFeedUrl = new URL("http://blog.teamtreehouse.com/api/get_recent_summary/?count=" + NUMBER_OF_POSTS);
           HttpURLConnection connection = (HttpURLConnection) blogFeedUrl.openConnection();
           connection.connect();

            responseCode = connection.getResponseCode();
           if (responseCode == HttpURLConnection.HTTP_OK) {
               InputStream inputStream = connection.getInputStream();
               Reader reader = new InputStreamReader(inputStream);
               int contentLength = connection.getContentLength();
               char[] charArray = new char[contentLength];
               reader.read(charArray);
               String responseData = new String(charArray);
               jsonResponse = new JSONObject(responseData);

               }

           else{

           Log.i(TAG, "Code :" + responseCode);}
       } catch (MalformedURLException e) {
           Log.e(TAG, "Exception Caught: ", e);
       } catch (IOException e) {
           Log.e(TAG, "Exception Caught: ", e);
       }
       catch (Exception e){ Log.e(TAG, "Exception Caught: ", e);}

       return jsonResponse;
   }


    public void onPostExecute(JSONObject result){
        mBlogData = result;
        updateList();

    }

}

}