Java tutorial
/* * Copyright (C) 2010-2012 C. Enrique Ortiz <enrique.ortiz@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.hyperkode.friendshare.fragment; import com.hyperkode.friendshare.R; import com.hyperkode.friendshare.db.DBAccess; import com.hyperkode.friendshare.entities.FriendStatus; import com.hyperkode.utils._2LevelImageDownloader; //import com.hyperkode.friendshare.db.DBAccess; import java.util.ArrayList; import java.util.List; import twitter4j.Query; import twitter4j.QueryResult; import twitter4j.ResponseList; import twitter4j.Tweet; import twitter4j.Twitter; import twitter4j.TwitterException; import twitter4j.TwitterFactory; import twitter4j.auth.AccessToken; import android.app.Activity; import android.app.Fragment; import android.app.ProgressDialog; import android.content.Context; import android.content.SharedPreferences; import android.os.AsyncTask; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; public class TwitterListFragment extends Fragment { private final String PREFS_NAME = "Prefs"; private SharedPreferences mSettings; private String accessToken; private String accessTokenSecret; private ListView listView; private Twitter twitter4j; private String searchTerm; private ArrayList<FriendStatus> mFriendsStatus = new ArrayList<FriendStatus>(); private FriendStatusAdapter mFriendStatusAdapter; private DBAccess dbAccess = null; private _2LevelImageDownloader imageDownloader; public TwitterListFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (savedInstanceState != null) searchTerm = savedInstanceState.getString("SearchTermString"); return inflater.inflate(R.layout.twitter_list, container, false); } /** * onResume Fragment life-cycle method */ @Override public void onResume() { super.onResume(); setupDB(); setupListView(); setupTwitter(); setupSearchButton(); imageDownloader = new _2LevelImageDownloader(); } /** * Destroy the Activity life-cycle method */ @Override public void onDestroy() { super.onDestroy(); dbAccess.closeDB(); } /** * Save the current search term instance * @param savedInstanceState the instance state to save */ @Override public void onSaveInstanceState(Bundle savedInstanceState) { savedInstanceState.putString("SearchTermString", searchTerm); super.onSaveInstanceState(savedInstanceState); } ///////////////////////////////////////////////////////////////////////////// private void setupDB() { dbAccess = new DBAccess(this.getActivity()); dbAccess.openDB(); } private void setupListView() { // Set the list view adapter listView = (ListView) this.getActivity().findViewById(R.id.twitter_listview); // Set the header before setting the Adapter LayoutInflater inflater = this.getActivity().getLayoutInflater(); ViewGroup header = (ViewGroup) inflater.inflate(R.layout.twitter_searchbox, listView, false); listView.addHeaderView(header, null, false); mFriendsStatus = dbAccess.selectAllFriendStatus(); // Set the Adapter mFriendStatusAdapter = new FriendStatusAdapter(this.getActivity(), mFriendsStatus, R.layout.twitter_list_item); listView.setAdapter(mFriendStatusAdapter); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View v, int position, long id) { } }); } private void setupTwitter() { mSettings = this.getActivity().getSharedPreferences(PREFS_NAME, 0); accessToken = mSettings.getString("twitter_access_token", null); accessTokenSecret = mSettings.getString("twitter_access_token_secret", null); // Get Access Token and persist it AccessToken at = new AccessToken(accessToken, accessTokenSecret); // initialize Twitter4J twitter4j = new TwitterFactory().getInstance(); twitter4j.setOAuthConsumer(getString(R.string.TWITTER_CONSUMER_KEY), getString(R.string.TWITTER_CONSUMER_SECRET)); twitter4j.setOAuthAccessToken(at); } private void setupSearchButton() { Button searchButton = (Button) this.getActivity().findViewById(R.id.twitter_searchbox_button); searchButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { EditText searchTextBox = (EditText) TwitterListFragment.this.getActivity() .findViewById(R.id.twitter_searchbox_textbox); searchTerm = searchTextBox.getText().toString(); if (searchTerm.length() > 0) searchTwitter(searchTerm); else getHomeTimeline(); } }); } /** * Get the home timeline */ private void getHomeTimeline() { new TwitterHometimelineTask().execute(this.getActivity()); } /** * Search Twitter * @param queryString the search term */ private void searchTwitter(String queryString) { new TwitterSearchTask().execute(queryString); } ///////////////////////////////////////////////////////////////////////////// /** * Define an generic Tweet/Status adapter for the twitter list */ class FriendStatusAdapter extends BaseAdapter { //private Context context; private ArrayList<FriendStatus> friendsStatus; private int resourceId; public FriendStatusAdapter(Context context, ArrayList<FriendStatus> status, int resourceId) { //this.context = context; this.friendsStatus = status; this.resourceId = resourceId; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (friendsStatus == null) return null; View rowView = convertView; if (rowView == null) { LayoutInflater vi = (LayoutInflater) TwitterListFragment.this.getActivity() .getSystemService(Context.LAYOUT_INFLATER_SERVICE); rowView = vi.inflate(resourceId, null); } FriendStatus status = friendsStatus.get(position); // Get resources TextView nameTextView = (TextView) rowView.findViewById(R.id.twitterstatus_textview_name); if (nameTextView != null) { nameTextView.setText(status.getName()); } TextView statusTextView = (TextView) rowView.findViewById(R.id.twitterstatus_textview_status); if (statusTextView != null) { statusTextView.setText(status.getStatus()); } ImageView imageView = (ImageView) rowView.findViewById(R.id.twitterstatus_image); if (imageView != null) { String url = status.getImageUrl(); imageView.setTag(url); imageDownloader.download(url, imageView); /* ImageDownloader.getDefaultInstance().displayImage( TwitterList.this, url, imageView, -1, new Handler() { @Override public void handleMessage(Message message) { if (mFriendStatusAdapter != null) mFriendStatusAdapter.notifyDataSetChanged(); } }); */ } // Return row view return rowView; } public final int getCount() { if (friendsStatus == null) return 0; return friendsStatus.size(); } public final FriendStatus getItem(int position) { if (friendsStatus == null) return null; return friendsStatus.get(position); } public final long getItemId(int position) { return position; } } ///////////////////////////////////////////////////////////////////////////// /** * Background async task to retrieve the twitter hometimeline */ class TwitterHometimelineTask extends AsyncTask<Context, Integer, Integer> { private ResponseList<twitter4j.Status> mStatuses; private ProgressDialog pd; protected void onPreExecute() { pd = ProgressDialog.show(TwitterListFragment.this.getActivity(), getString(R.string.please_wait), getString(R.string.loading_twitter)); } protected Integer doInBackground(Context... params) { try { mStatuses = twitter4j.getHomeTimeline(); } catch (TwitterException e) { e.printStackTrace(); } mFriendsStatus.clear(); for (twitter4j.Status status : mStatuses) { FriendStatus fs = new FriendStatus(); fs.setId(String.valueOf(status.getId())); fs.setName(status.getUser().getName()); fs.setStatus(status.getText()); fs.setImageUrl(status.getUser().getProfileImageURL().toString()); mFriendsStatus.add(fs); dbAccess.insertFriendStatus(fs); System.out.println(status.getUser().getName() + ":" + status.getText()); } return 0; } protected void onPostExecute(Integer result) { if (pd != null) pd.dismiss(); if (mFriendStatusAdapter != null) mFriendStatusAdapter.notifyDataSetChanged(); } } ///////////////////////////////////////////////////////////////////////////// /** * Background async task to search in twitter */ class TwitterSearchTask extends AsyncTask<String, Integer, Integer> { private ProgressDialog pd; private List<Tweet> tweets; protected void onPreExecute() { pd = ProgressDialog.show(TwitterListFragment.this.getActivity(), getString(R.string.please_wait), getString(R.string.searching_twitter)); } protected Integer doInBackground(String... params) { if (params == null) return 0; String queryString = (String) params[0]; if (queryString == null) return 0; if (queryString.length() == 0) return 0; // The factory instance is re-useable and thread safe. Twitter twitter = new TwitterFactory().getInstance(); Query query = new Query(queryString); QueryResult result = null; try { result = twitter.search(query); } catch (TwitterException e) { e.printStackTrace(); } tweets = result.getTweets(); mFriendsStatus.clear(); for (Tweet tweet : tweets) { FriendStatus fs = new FriendStatus(); fs.setId(String.valueOf(tweet.getId())); fs.setName(tweet.getFromUser()); fs.setStatus(tweet.getText()); fs.setImageUrl(tweet.getProfileImageUrl()); mFriendsStatus.add(fs); dbAccess.insertFriendStatus(fs); System.out.println(tweet.getFromUser() + ":" + tweet.getText()); } return 0; } protected void onPostExecute(Integer result) { if (pd != null) pd.dismiss(); if (mFriendStatusAdapter != null) mFriendStatusAdapter.notifyDataSetChanged(); } } }