Android Open Source - Blog-Reader Main List Activity

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License

The source code is released under:

MIT License

Java Source Code

package me.rdokollari.blogreader;
//from   w  w w.jav  a 2s.  c o  m
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.rizartdokollari.blogreader.R;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Html;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class MainListActivity extends ListActivity {

  private static final String KEY_AUTHOR = "author";
  private static final String KEY_TITLE = "title";

  public static final int NUMBER_OF_POSTS = 20;
  public static final String TAG = MainListActivity.class.getSimpleName();
  protected JSONObject mBlogData;
  protected ProgressBar mProgressBar;

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

    mProgressBar = (ProgressBar) findViewById(R.id.progressBar1);

    if (isNetwokAvailable()) {
      mProgressBar.setVisibility(View.VISIBLE);
      GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
      getBlogPostsTask.execute();
    } else {
      Toast.makeText(this, "Network is unavailable", Toast.LENGTH_LONG)
          .show();
    }

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

  @Override
  protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);

    JSONArray jsonPosts;
    try {
      jsonPosts = mBlogData.getJSONArray("posts");
      JSONObject jsonPost = jsonPosts.getJSONObject(position);
      String blogUrl = jsonPost.getString("url");
      Intent intent = new Intent(this, BlogWebViewActivity.class);
      intent.setData(Uri.parse(blogUrl));
      startActivity(intent);
    } catch (JSONException e) {
      logException(e);
    }

  } // end onListItemClick method

  private void logException(Exception e) {
    logException(e);
  }

  private boolean isNetwokAvailable() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

    boolean isAvailable = false;
    if (networkInfo != null && networkInfo.isConnected()) { // check if
      // network is
      // Present
      isAvailable = true;
    }

    return isAvailable;
  }

  public void handleBlogResponse() {
    mProgressBar.setVisibility(View.INVISIBLE);

    if (getmBlogData() == null) {
      updateDisplayForError();
    } else {
      try {
        JSONArray jsonPosts = mBlogData.getJSONArray("posts");
        ArrayList<HashMap<String, String>> blogPosts = new ArrayList<HashMap<String, String>>();

        for (int i = 0; i < jsonPosts.length(); i++) {
          JSONObject post = jsonPosts.getJSONObject(i);
          String title = post.getString(KEY_TITLE);
          title = Html.fromHtml(title).toString();
          String author = post.getString(KEY_AUTHOR);
          author = Html.fromHtml(author).toString();

          HashMap<String, String> blogPost = new HashMap<String, String>();
          blogPost.put(KEY_TITLE, title);
          blogPost.put(KEY_AUTHOR, author);

          blogPosts.add(blogPost);
        } // end for

        String[] keys = { KEY_TITLE, KEY_AUTHOR };
        int[] ids = { android.R.id.text1, android.R.id.text2 };
        SimpleAdapter adapter = new SimpleAdapter(this, blogPosts,
            android.R.layout.simple_list_item_2, keys, ids);

        setListAdapter(adapter);
      } catch (JSONException e) {
        logException(e);
      } // end try catch
    } // end else
  } // end updateList method

  private void updateDisplayForError() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle(getString(R.string.title));
    builder.setMessage(getString(R.string.error_message));
    builder.setPositiveButton(android.R.string.ok, null);
    AlertDialog dialog = builder.create();
    dialog.show();

    TextView textViewEmpty = (TextView) getListView().getEmptyView();
    textViewEmpty.setText(getString(R.string.no_items));
  }

  public JSONObject getmBlogData() {
    return mBlogData;
  }

  public void setmBlogData(JSONObject mBlogData) {
    this.mBlogData = mBlogData;
  }

  // create a subclass
  private class GetBlogPostsTask extends AsyncTask<Object, Void, JSONObject> {

    @Override
    protected JSONObject doInBackground(Object... arg0) { // ellipses zero
      // or n
      // arguments
      int responseCode = -1;
      JSONObject jsonResponse = null;
      StringBuilder builder = new StringBuilder();
      HttpClient client = new DefaultHttpClient();
      HttpGet httpget = new HttpGet(
          "http://blog.teamtreehouse.com/api/get_recent_summary/?count="
              + NUMBER_OF_POSTS);

      try {
        HttpResponse response = client.execute(httpget);
        StatusLine statusLine = response.getStatusLine();
        responseCode = statusLine.getStatusCode();

        if (responseCode == HttpURLConnection.HTTP_OK) {
          HttpEntity entity = response.getEntity();
          InputStream content = entity.getContent();
          BufferedReader reader = new BufferedReader(
              new InputStreamReader(content));
          String line;
          while ((line = reader.readLine()) != null) {
            builder.append(line);
          }

          jsonResponse = new JSONObject(builder.toString());
        } else {
          Log.i(TAG, String.format("Unsuccessful HTTP response code: %d",
              responseCode));
        }
      } catch (JSONException e) {
        logException(e);
      } catch (Exception e) {
        logException(e);
      }

      return jsonResponse;
    } // end doInBackground method

    @Override
    protected void onPostExecute(JSONObject result) {
      mBlogData = result;
      handleBlogResponse();
    } // end onPostExecute method
  } // end GetBlogPostsTask subclass
}

Java Source Code List

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