Java tutorial
/******************************************************************************* * This file is part of RedReader. * * RedReader 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. * * RedReader 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 RedReader. If not, see <http://www.gnu.org/licenses/>. ******************************************************************************/ package org.quantumbadger.redreader.activities; import android.content.DialogInterface; import android.content.Intent; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.support.v4.app.FragmentTransaction; import android.view.WindowManager; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuItem; import org.holoeverywhere.app.Activity; import org.holoeverywhere.app.AlertDialog; import org.holoeverywhere.preference.PreferenceManager; import org.holoeverywhere.preference.SharedPreferences; import org.holoeverywhere.widget.EditText; import org.holoeverywhere.widget.LinearLayout; import org.quantumbadger.redreader.R; import org.quantumbadger.redreader.account.RedditAccount; import org.quantumbadger.redreader.account.RedditAccountChangeListener; import org.quantumbadger.redreader.account.RedditAccountManager; import org.quantumbadger.redreader.common.General; import org.quantumbadger.redreader.common.LinkHandler; import org.quantumbadger.redreader.common.PrefsUtility; import org.quantumbadger.redreader.fragments.PostListingFragment; import org.quantumbadger.redreader.fragments.SessionListDialog; import org.quantumbadger.redreader.listingcontrollers.PostListingController; import org.quantumbadger.redreader.reddit.RedditURLParser; import org.quantumbadger.redreader.reddit.api.RedditSubredditSubscriptionManager; import org.quantumbadger.redreader.reddit.prepared.RedditPreparedPost; import org.quantumbadger.redreader.views.RedditPostView; import java.util.UUID; public class PostListingActivity extends RefreshableActivity implements RedditAccountChangeListener, RedditPostView.PostSelectionListener, SharedPreferences.OnSharedPreferenceChangeListener, OptionsMenuUtility.OptionsMenuPostsListener, SessionChangeListener, RedditSubredditSubscriptionManager.SubredditSubscriptionStateChangeListener { private PostListingFragment fragment; private PostListingController controller; private SharedPreferences sharedPreferences; public void onCreate(final Bundle savedInstanceState) { PrefsUtility.applyTheme(this); // TODO load from savedInstanceState getSupportActionBar().setHomeButtonEnabled(true); getSupportActionBar().setDisplayHomeAsUpEnabled(true); getWindow().setBackgroundDrawable(new ColorDrawable(getSupportActionBarContext() .obtainStyledAttributes(new int[] { R.attr.rrListBackgroundCol }).getColor(0, 0))); sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); sharedPreferences.registerOnSharedPreferenceChangeListener(this); RedditAccountManager.getInstance(this).addUpdateListener(this); if (getIntent() != null) { final Intent intent = getIntent(); final RedditURLParser.RedditURL url = RedditURLParser.parseProbablePostListing(intent.getData()); if (!(url instanceof RedditURLParser.PostListingURL)) { throw new RuntimeException(String.format("'%s' is not a post listing URL!", url.generateJsonUri())); } controller = new PostListingController((RedditURLParser.PostListingURL) url); OptionsMenuUtility.fixActionBar(this, url.humanReadableName(this, false)); super.onCreate(savedInstanceState); setContentView(R.layout.main_single); requestRefresh(RefreshableFragment.POSTS, false); } else { throw new RuntimeException("Nothing to show! (should load from bundle)"); // TODO } addSubscriptionListener(); } @Override protected void onSaveInstanceState(final Bundle outState) { super.onSaveInstanceState(outState); // TODO save instance state } @Override public boolean onCreateOptionsMenu(final Menu menu) { final RedditAccount user = RedditAccountManager.getInstance(this).getDefaultAccount(); final RedditSubredditSubscriptionManager.SubredditSubscriptionState subredditSubscriptionState; final RedditSubredditSubscriptionManager subredditSubscriptionManager = RedditSubredditSubscriptionManager .getSingleton(this, user); if (!user.isAnonymous() && controller.isSubreddit() && subredditSubscriptionManager.areSubscriptionsReady() && fragment != null && fragment.getSubreddit() != null) { subredditSubscriptionState = subredditSubscriptionManager .getSubscriptionState(controller.subredditCanonicalName()); } else { subredditSubscriptionState = null; } final String subredditDescription = fragment != null && fragment.getSubreddit() != null ? fragment.getSubreddit().description_html : null; OptionsMenuUtility.prepare(this, menu, false, true, false, controller.isSortable(), false, subredditSubscriptionState, subredditDescription != null && subredditDescription.length() > 0); return true; } private void addSubscriptionListener() { RedditSubredditSubscriptionManager .getSingleton(this, RedditAccountManager.getInstance(this).getDefaultAccount()).addListener(this); } public void onRedditAccountChanged() { addSubscriptionListener(); postInvalidateOptionsMenu(); requestRefresh(RefreshableFragment.ALL, false); } @Override protected void doRefresh(final RefreshableFragment which, final boolean force) { if (fragment != null) fragment.cancel(); fragment = controller.get(force); final FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); transaction.replace(R.id.main_single_frame, fragment, "post_listing_fragment"); transaction.commit(); } public void onPostSelected(final RedditPreparedPost post) { LinkHandler.onLinkClicked(this, post.url, false, post.src); } public void onPostCommentsSelected(final RedditPreparedPost post) { final Intent intent = new Intent(this, CommentListingActivity.class); intent.putExtra("postId", post.idAlone); startActivityForResult(intent, 1); } public void onRefreshPosts() { controller.setSession(null); requestRefresh(RefreshableFragment.POSTS, true); } public void onPastPosts() { final SessionListDialog sessionListDialog = SessionListDialog.newInstance(controller.getUri(), controller.getSession(), SessionChangeType.POSTS); sessionListDialog.show(this); } public void onSubmitPost() { final Intent intent = new Intent(this, PostSubmitActivity.class); if (controller.isSubreddit()) { intent.putExtra("subreddit", controller.subredditCanonicalName()); } startActivity(intent); } public void onSortSelected(final PostListingController.Sort order) { controller.setSort(order); requestRefresh(RefreshableFragment.POSTS, false); } @Override public void onSearchPosts() { onSearchPosts(controller, this); } public static void onSearchPosts(final PostListingController controller, final Activity activity) { final AlertDialog.Builder alertBuilder = new AlertDialog.Builder(activity); final LinearLayout layout = (LinearLayout) activity.getLayoutInflater().inflate(R.layout.dialog_editbox); final EditText editText = (EditText) layout.findViewById(R.id.dialog_editbox_edittext); editText.requestFocus(); alertBuilder.setView(layout); alertBuilder.setTitle(R.string.action_search); alertBuilder.setPositiveButton(R.string.action_search, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { final String query = editText.getText().toString().toLowerCase().trim(); final RedditURLParser.SearchPostListURL url; if (controller != null && controller.isSubreddit()) { url = RedditURLParser.SearchPostListURL.build(controller.subredditCanonicalName(), query); } else { url = RedditURLParser.SearchPostListURL.build(null, query); } final Intent intent = new Intent(activity, PostListingActivity.class); intent.setData(url.generateJsonUri()); activity.startActivity(intent); } }); alertBuilder.setNegativeButton(R.string.dialog_cancel, null); final AlertDialog alertDialog = alertBuilder.create(); alertDialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE); alertDialog.show(); } @Override public void onSubscribe() { fragment.onSubscribe(); } @Override public void onUnsubscribe() { fragment.onUnsubscribe(); } @Override public void onSidebar() { final Intent intent = new Intent(this, HtmlViewActivity.class); intent.putExtra("html", fragment.getSubreddit().getSidebarHtml(PrefsUtility.isNightMode(this))); intent.putExtra("title", String.format("%s: %s", getString(R.string.sidebar_activity_title), fragment.getSubreddit().url)); startActivityForResult(intent, 1); } public void onSharedPreferenceChanged(final SharedPreferences prefs, final String key) { if (PrefsUtility.isRestartRequired(this, key)) { requestRefresh(RefreshableFragment.RESTART, false); } if (PrefsUtility.isRefreshRequired(this, key)) { requestRefresh(RefreshableFragment.ALL, false); } } @Override protected void onDestroy() { super.onDestroy(); sharedPreferences.unregisterOnSharedPreferenceChangeListener(this); } @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case android.R.id.home: finish(); return true; default: return super.onOptionsItemSelected(item); } } public void onSessionSelected(UUID session, SessionChangeType type) { controller.setSession(session); requestRefresh(RefreshableFragment.POSTS, false); } public void onSessionRefreshSelected(SessionChangeType type) { onRefreshPosts(); } public void onSessionChanged(UUID session, SessionChangeType type, long timestamp) { controller.setSession(session); } @Override public void onBackPressed() { if (General.onBackPressed()) super.onBackPressed(); } @Override public void onSubredditSubscriptionListUpdated( RedditSubredditSubscriptionManager subredditSubscriptionManager) { postInvalidateOptionsMenu(); } @Override public void onSubredditSubscriptionAttempted(RedditSubredditSubscriptionManager subredditSubscriptionManager) { postInvalidateOptionsMenu(); } @Override public void onSubredditUnsubscriptionAttempted( RedditSubredditSubscriptionManager subredditSubscriptionManager) { postInvalidateOptionsMenu(); } private void postInvalidateOptionsMenu() { runOnUiThread(new Runnable() { @Override public void run() { invalidateOptionsMenu(); } }); } }