Java tutorial
/* * Copyright 2014 Daniel Pedraza-Arcega * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.twitt4droid.widget; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.text.format.DateFormat; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.TextView; import android.widget.Toast; import com.twitt4droid.R; import com.twitt4droid.Resources; import com.twitt4droid.Twitt4droid; import com.twitt4droid.activity.UserProfileActivity; import com.twitt4droid.util.Images.ImageLoader; import twitter4j.AsyncTwitter; import twitter4j.Status; import twitter4j.TwitterAdapter; import twitter4j.TwitterException; import twitter4j.TwitterMethod; import java.util.ArrayList; import java.util.List; /** * Adapter that is responsible for making a View for each Twitter status. * * @author Daniel Pedraza-Arcega * @since version 1.0 */ public class TweetAdapter extends BaseAdapter { private static final String TAG = TweetAdapter.class.getSimpleName(); private final Context context; private AsyncTwitter twitter; private List<Status> data; private boolean isUsingDarkTheme; /** * Standard constructor. * * @param context the context. */ public TweetAdapter(Context context) { if (!Twitt4droid.isUserLoggedIn(context)) throw new IllegalStateException("User must be logged in in order to use TweetAdapter"); this.context = context; this.data = new ArrayList<>(); this.twitter = Twitt4droid.getAsyncTwitter(context); setUpTwitter(); } /** Sets up twitter callbacks. */ private void setUpTwitter() { twitter.addListener(new TwitterAdapter() { @Override public void createdFavorite(Status status) { ((Activity) context).runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(context.getApplicationContext(), R.string.twitt4droid_tweet_favorited, Toast.LENGTH_SHORT).show(); } }); } @Override public void retweetedStatus(Status retweetedStatus) { ((Activity) context).runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(context.getApplicationContext(), R.string.twitt4droid_tweet_retweeted, Toast.LENGTH_SHORT).show(); } }); } @Override public void onException(TwitterException te, TwitterMethod method) { Log.e(TAG, "Twitter error in" + method, te); ((Activity) context).runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(context.getApplicationContext(), R.string.twitt4droid_error_message, Toast.LENGTH_SHORT).show(); } }); } }); } /** @param data the data to be displayed. */ public void set(List<Status> data) { this.data = data == null ? new ArrayList<Status>() : data; notifyDataSetChanged(); } /** {@inheritDoc} */ @Override public int getCount() { return data.size(); } /** {@inheritDoc} */ @Override public Status getItem(int position) { return data.get(position); } /** {@inheritDoc} */ @Override public long getItemId(int position) { return position; } /** @param useDarkTheme if this adapter uses or not the dark theme. */ public void setUseDarkTheme(boolean useDarkTheme) { isUsingDarkTheme = useDarkTheme; } /** {@inheritDoc} */ @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { LayoutInflater layoutInflater = (LayoutInflater) context .getSystemService(Activity.LAYOUT_INFLATER_SERVICE); convertView = layoutInflater.inflate(R.layout.twitt4droid_tweet_item, parent, false); holder = new ViewHolder(); holder.context = context; holder.twitter = twitter; holder.isUsingDarkTheme = isUsingDarkTheme; holder.contentLayout = (RelativeLayout) convertView.findViewById(R.id.content_layout); holder.profileImage = (ImageView) convertView.findViewById(R.id.tweet_profile_image); holder.clockImage = (ImageView) convertView.findViewById(R.id.clock_image); holder.tweetTextView = (TextView) convertView.findViewById(R.id.tweet_content_text); holder.usernameTextView = (TextView) convertView.findViewById(R.id.tweet_username_text); holder.tweetTimeTextView = (TextView) convertView.findViewById(R.id.tweet_time_text); holder.overflowButton = (ImageButton) convertView.findViewById(R.id.tweet_options_button); convertView.setTag(holder); } else holder = (ViewHolder) convertView.getTag(); holder.setContent(getItem(position)); return convertView; } /** * Stores each of the component views inside the tag field of a Layout, so it can immediately * access them without the need to look them up repeatedly. * * @author Daniel Pedraza-Arcega * @since version 1.0 */ private static class ViewHolder { private Context context; private AsyncTwitter twitter; private RelativeLayout contentLayout; private ImageView profileImage; private ImageView clockImage; private TextView usernameTextView; private TextView tweetTextView; private TextView tweetTimeTextView; private ImageButton overflowButton; private boolean isUsingDarkTheme; /** * Sets up the content of a Twitter status. * * @param status a Twitter status. */ private void setContent(final Status status) { setUpDarkThemeIfNeeded(); usernameTextView.setText(context.getString(R.string.twitt4droid_tweet_username_format, status.getUser().getScreenName(), status.getUser().getName())); tweetTextView.setText(status.getText()); String dateText = context.getString(R.string.twitt4droid_tweet_date_format, DateFormat.getDateFormat(context.getApplicationContext()).format(status.getCreatedAt()), DateFormat.getTimeFormat(context.getApplicationContext()).format(status.getCreatedAt())); tweetTimeTextView.setText(dateText); new ImageLoader(context).setImageView(profileImage) .setLoadingColorId(R.color.twitt4droid_no_image_background) .execute(status.getUser().getProfileImageURL()); profileImage.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent profileIntent = UserProfileActivity.buildIntent(context, status.getUser().getScreenName(), isUsingDarkTheme); context.startActivity(profileIntent); } }); overflowButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { new AlertDialog.Builder(context).setItems(R.array.twitt4droid_tweet_context_menu, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { switch (which) { case 0: String text = context.getString(R.string.twitt4droid_username_format, status.getUser().getScreenName()); new TweetDialog(context).addTextToTweet(text).show(); break; case 1: if (Resources.isConnectedToInternet(context)) twitter.retweetStatus(status.getId()); else { Toast.makeText(context.getApplicationContext(), R.string.twitt4droid_is_offline_messege, Toast.LENGTH_LONG) .show(); } break; case 2: if (Resources.isConnectedToInternet(context)) twitter.createFavorite(status.getId()); else { Toast.makeText(context.getApplicationContext(), R.string.twitt4droid_is_offline_messege, Toast.LENGTH_LONG) .show(); } break; } } }).setInverseBackgroundForced(true).show(); } }); } /** Sets up the dark theme if needed. */ private void setUpDarkThemeIfNeeded() { if (isUsingDarkTheme) { contentLayout.setBackgroundResource(R.drawable.twitt4droid_holo_dark_background_with_shadow); overflowButton.setImageResource(R.drawable.twitt4droid_ic_overflow_holo_dark); clockImage.setImageResource(R.drawable.twitt4droid_ic_clock_holo_dark); usernameTextView .setTextColor(context.getResources().getColor(R.color.twitt4droid_text_color_inverse)); tweetTextView.setTextColor(context.getResources().getColor(R.color.twitt4droid_text_color_inverse)); tweetTimeTextView .setTextColor(context.getResources().getColor(R.color.twitt4droid_text_color_inverse)); } } } }