Java tutorial
/* * Copyright 2014 Artem Chikin * Copyright 2014 Artem Herasymchuk * Copyright 2014 Tom Krywitsky * Copyright 2014 Henry Pabst * Copyright 2014 Bradley Simons * * 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 ca.ualberta.cmput301w14t08.geochan.fragments; import android.app.ActionBar; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentManager.OnBackStackChangedListener; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import ca.ualberta.cmput301w14t08.geochan.R; /** * Displays user's favourited threads/comments, provides navigation to each via * a spinner. * * @author Artem Chikin * */ public class FavouritesFragment extends Fragment implements ActionBar.OnNavigationListener, OnBackStackChangedListener { private static ActionBar actionBar; private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item"; /** * Set up the fragment, action bar and the spinner. * * @param inflater The LayoutInflater used to inflate the fragment's UI. * @param container The parent View that the fragment's UI is attached to. * @param savedInstanceState The previously saved state of the fragment. * @return The View for the fragment's UI. * */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { super.onCreateView(inflater, container, savedInstanceState); // Get which counter requested this activity // Intent intent = getIntent(); // Set up the action bar to show a dropdown list. actionBar = getActivity().getActionBar(); enableSpinner(); // Show the Up button in the action bar. actionBar.setDisplayHomeAsUpEnabled(true); // Set up the dropdown list navigation in the action bar. actionBar.setListNavigationCallbacks( // Specify a SpinnerAdapter to populate the dropdown list. new ArrayAdapter<String>(actionBar.getThemedContext(), android.R.layout.simple_list_item_1, android.R.id.text1, new String[] { getString(R.string.threads_fav), getString(R.string.comments_fav), }), this); return inflater.inflate(R.layout.fragment_favourites, container, false); } /** * Restore spinner state from savedInstanceState. * @param savedInstanceState The previously saved state of the fragment. * */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Restore the previously serialized current dropdown position. if (savedInstanceState != null) { if (savedInstanceState.containsKey(STATE_SELECTED_NAVIGATION_ITEM)) { actionBar.setSelectedNavigationItem(savedInstanceState.getInt(STATE_SELECTED_NAVIGATION_ITEM)); } } getChildFragmentManager().addOnBackStackChangedListener(this); } /** * Save spinner selection. * * @param outState The Bundle for data to be saved to. * */ @Override public void onSaveInstanceState(Bundle outState) { // Serialize the current dropdown position. outState.putInt(STATE_SELECTED_NAVIGATION_ITEM, actionBar.getSelectedNavigationIndex()); super.onSaveInstanceState(outState); } /** * Disables the spinner. */ @Override public void onPause() { super.onPause(); disableSpinner(); } /** * Calls onActivityResult on the PostFragment previously being used by the user. A * workaround for onActivityResult not being called on child fragments, so instead when * favourites are involved we call it on the parent fragment then delegate back to * the child fragment. * * @param requestCode The requestCode given in startActivityForResult. * @param resultCode The code returned by the activity. * @param data Data returned by the activity. */ @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); FragmentManager childManager = getChildFragmentManager(); PostFragment postFrag = (PostFragment) childManager.findFragmentByTag("postFrag"); postFrag.onActivityResult(requestCode, resultCode, data); } /** * On spinner selection, inflate correct favourites fragment. * @param position The position of the navigation item. * @param id The ID of the navigation item. */ @Override public boolean onNavigationItemSelected(int position, long id) { switch (position) { case 0: Fragment thrFragment = new FavouriteThreadsFragment(); getChildFragmentManager().beginTransaction().replace(R.id.container, thrFragment, "favThrFragment") .commit(); break; case 1: Fragment cmtFragment = new FavouriteCommentsFragment(); getChildFragmentManager().beginTransaction().replace(R.id.container, cmtFragment, "favComFragment") .commit(); break; } return true; } /** * Enable/disable spinner if in fragment. */ @Override public void onBackStackChanged() { Fragment f = getChildFragmentManager().findFragmentByTag("thread_view_fragment"); if (f != null) { disableSpinner(); } else { enableSpinner(); } } /** * Enable the spinner. */ private void enableSpinner() { actionBar.setDisplayShowTitleEnabled(false); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST); } /** * Disable the spinner. */ private void disableSpinner() { actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setDisplayShowTitleEnabled(true); } }