Android Open Source - SimpleTwitterClient Timeline Activity

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License

The source code is released under:
MIT License
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Java Source Code

package com.nickrasband.simpletwitterclient;
/*from  w w  w  .j a v  a2s  .c o m*/
import java.util.ArrayList;

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

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;

import com.loopj.android.http.JsonHttpResponseHandler;
import com.nickrasband.simpletwitterclient.models.Tweet;
import com.nickrasband.simpletwitterclient.models.User;

import eu.erikw.PullToRefreshListView;
import eu.erikw.PullToRefreshListView.OnRefreshListener;

public class TimelineActivity extends Activity {
  private static final int TWEETS_PER_LOAD = 25;
  private ArrayList<Tweet> tweets;
  private TweetsAdapter adapter;
  private PullToRefreshListView lvTweets;
  private User currentUser;
  private long smallest_tweet_id;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_timeline);
    
    tweets = new ArrayList<Tweet>();
    adapter = new TweetsAdapter(this, tweets);
    lvTweets = (PullToRefreshListView)findViewById(R.id.lvTweets);
    lvTweets.setAdapter(adapter);
    
    // Load initial 25 tweets.
    loadTweets(true);
    
    lvTweets.setOnRefreshListener(new OnRefreshListener() {
      @Override
      public void onRefresh() {
        loadTweets(true);
      }
    });
    
    lvTweets.setOnScrollListener(new EndlessScrollListener() {
        @Override
        public void onLoadMore(int page, int totalItemsCount) {
                  // Triggered only when new data needs to be appended to the list
                  // Add whatever code is needed to append new items to your AdapterView
            loadTweets(false);
        }
      });    
  }
  
  private void loadTweets(final Boolean freshList) {
    long smallest_tweet = smallest_tweet_id - 1;
    if (freshList) {
      smallest_tweet = 0;
    }
    
    SimpleTwitterClientApp.getRestClient().getHomeTimeline(TWEETS_PER_LOAD, smallest_tweet, new JsonHttpResponseHandler() {
      @Override
      public void onSuccess(JSONArray jsonTweetsArray) {
        lvTweets.onRefreshComplete();
        // Clear out the old adapter, if necessary.
        if (freshList) {
          adapter.clear();
        }
        adapter.addAll(Tweet.tweetsFromJsonArray(jsonTweetsArray));
        
        // Only update lowest tweet id if it is valid.
        int index = adapter.getCount() - 1;
        if (index >= 0)
        {
          long tweet_id = adapter.getItem(index).getTweetId();
          if (tweet_id != 0) {
            smallest_tweet_id = tweet_id;
          }
        }
      }
      
      public void onFailure(Throwable e, JSONObject error) {
          Log.e("ERROR", e.toString());
          Log.e("ERROR", error.toString());
      }
    });
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.timeline, menu);
    return true;
  }
  
  // Compose a tweet when the compose menu
  // item is tapped.
  public void composeTweet(MenuItem item) {
    if (currentUser == null) {
      /*
      // First, get some user data, so that we can easily update user tweets.
      SimpleTwitterClientApp.getRestClient().getUserCredentials(true, false, new JsonHttpResponseHandler() {
        public void onSuccess(JSONObject user) {
          currentUser = new User(user);
          Intent i = new Intent(getBaseContext(), ComposeTweetActivity.class);
          i.putExtra("currentUser", currentUser);
          startActivityForResult(i, 0);
        }
        
        public void onFailure(Throwable e, JSONObject error) {
          Log.d("USER_CREDENTIALS", "Failed to get user credentials. Using empty currentUser object.");
          currentUser = new User(new JSONObject());
          Intent i = new Intent(getBaseContext(), ComposeTweetActivity.class);
          i.putExtra("currentUser", currentUser);
          startActivityForResult(i, 0);
        }
      }); */
      currentUser = new User(new JSONObject());
    }
    
    Intent i = new Intent(this, ComposeTweetActivity.class);
    i.putExtra("current_user", currentUser);
    startActivityForResult(i, 0);
  }
  
  // Handle the result of the ComposeTweetActivity.
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // Result from the ComposeTweetActivity.
    if (requestCode == 0)
    {
      if (resultCode == RESULT_OK) {
        String tweetMessage = data.getStringExtra("message");
        String tweetTimestamp = data.getStringExtra("tweet_timestamp");
        String tweetId = data.getStringExtra("tweet_id");
        currentUser = (User)data.getParcelableExtra("current_user");
        addTweetForCurrentUser(tweetMessage, tweetTimestamp, tweetId);
      }
    } 
  }
  
  private void addTweetForCurrentUser(String message, String tweetTimestamp, String tweetId) {
    adapter.insert(new Tweet(currentUser, message, tweetTimestamp, tweetId), 0);
  }
}
Java Source Code List
