Java tutorial
/* Copyright (c) 2014-2015 F-Secure See LICENSE for details */ package cc.softwarefactory.lokki.android.fragments; import android.app.Activity; import android.content.res.Configuration; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.ListView; import com.androidquery.AQuery; import cc.softwarefactory.lokki.android.MainApplication; import cc.softwarefactory.lokki.android.R; import cc.softwarefactory.lokki.android.avatar.AvatarLoader; import cc.softwarefactory.lokki.android.models.MainUser; import cc.softwarefactory.lokki.android.utilities.PreferenceUtils; /** * Fragment used for managing interactions for and presentation of a navigation drawer. * See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction"> * design guidelines</a> for a complete explanation of the behaviors implemented here. */ public class NavigationDrawerFragment extends Fragment { /** * A pointer to the current callbacks instance (the Activity). */ private NavigationDrawerCallbacks mCallbacks; /** * Helper component that ties the action bar to the navigation drawer. */ private ActionBarDrawerToggle mDrawerToggle; private DrawerLayout mDrawerLayout; private ListView mDrawerListView; private View mFragmentContainerView; private View mListViewHeader; private static final String TAG = "NavDrawerFragment"; private int mCurrentSelectedNavDrawerListPosition = 1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Select either the default item (0) or the last selected item. selectNavDrawerItem(mCurrentSelectedNavDrawerListPosition); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Indicate that this fragment would like to influence the set of actions in the action bar. setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mDrawerListView = (ListView) inflater.inflate(R.layout.fragment_navigation_drawer, container, false); mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectNavDrawerItem(position); } }); mListViewHeader = inflater.inflate(R.layout.fragment_drawer_header, mDrawerListView, false); mDrawerListView.addHeaderView(mListViewHeader, null, false); setUserInfo(); String[] menuOptions = getResources().getStringArray(R.array.nav_drawer_options); mDrawerListView.setAdapter(new ArrayAdapter<String>(getActivity().getApplicationContext(), R.layout.drawer_list_item, R.id.nav_drawer_menu_item_text, menuOptions) { @Override public View getView(int position, View convertView, ViewGroup parent) { View viewItem = super.getView(position, convertView, parent); ((ImageView) viewItem.findViewById(R.id.drawer_item_icon)).setImageResource( getResources().obtainTypedArray(R.array.nav_drawer_icons).getResourceId(position, -1)); return viewItem; } }); mDrawerListView.setItemChecked(mCurrentSelectedNavDrawerListPosition, true); return mDrawerListView; } public void setUserInfo() { if (mListViewHeader != null) { AQuery aq = new AQuery(getActivity(), mListViewHeader); ImageView avatarImage = (ImageView) mListViewHeader.findViewById(R.id.avatar); AvatarLoader avatarLoader = new AvatarLoader(); MainUser user = MainApplication.user; avatarLoader.load(user, avatarImage); if (user != null && user.getEmail() != null) { aq.id(R.id.user_name).text(MainApplication.user.getEmail()); } } else { Log.e(TAG, "Cannot add user info. ListViewHeader not initialized"); } } public boolean isDrawerOpen() { return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView); } public void toggleDrawer() { if (isDrawerOpen()) { mDrawerLayout.closeDrawer(GravityCompat.START); } else { mDrawerLayout.openDrawer(GravityCompat.START); } } /** * Users of this fragment must call this method to set up the navigation drawer interactions. * * @param fragmentId The android:id of this fragment in its activity's layout. * @param drawerLayout The DrawerLayout containing this fragment's UI. */ public void setUp(int fragmentId, DrawerLayout drawerLayout) { mFragmentContainerView = getActivity().findViewById(fragmentId); mDrawerLayout = drawerLayout; // set a custom shadow that overlays the map content when the drawer opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener // ActionBarDrawerToggle ties together the the proper interactions // between the navigation drawer and the action bar app icon. mDrawerToggle = new ActionBarDrawerToggle(getActivity(), /* host Activity */ mDrawerLayout, /* DrawerLayout object */ R.string.app_name, /* "open drawer" description for accessibility */ R.string.app_name /* "close drawer" description for accessibility */ ) { @Override public void onDrawerClosed(View drawerView) { super.onDrawerClosed(drawerView); if (!isAdded()) { return; } getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu() } @Override public void onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); if (!isAdded()) { return; } getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu() } }; // Defer code dependent on restoration of previous instance state. mDrawerLayout.post(new Runnable() { @Override public void run() { mDrawerToggle.syncState(); } }); mDrawerLayout.setDrawerListener(mDrawerToggle); } public void selectNavDrawerItem(int navDrawerListPosition) { mCurrentSelectedNavDrawerListPosition = navDrawerListPosition; if (mDrawerListView != null) { mDrawerListView.setItemChecked(navDrawerListPosition, true); } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } if (mCallbacks != null) { mCallbacks.onNavigationDrawerItemSelected(navDrawerListPosition - 1); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { mCallbacks = (NavigationDrawerCallbacks) activity; } catch (ClassCastException e) { throw new ClassCastException("Activity must implement NavigationDrawerCallbacks."); } } @Override public void onDetach() { super.onDetach(); mCallbacks = null; } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Forward the new configuration the drawer toggle component. mDrawerToggle.onConfigurationChanged(newConfig); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { // If the drawer is open, show the contacts app actions in the action bar. See also // showGlobalContextActionBar, which controls the top-left area of the action bar. if (mDrawerLayout != null && isDrawerOpen()) { //inflater.inflate(R.menu.contacts, menu); showGlobalContextActionBar(); } super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { return mDrawerToggle.onOptionsItemSelected(item) || super.onOptionsItemSelected(item); } /** * Per the navigation drawer design guidelines, updates the action bar to show the contacts app * 'context', rather than just what's in the current screen. */ private void showGlobalContextActionBar() { ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayShowTitleEnabled(true); } private ActionBar getSupportActionBar() { return ((AppCompatActivity) getActivity()).getSupportActionBar(); } /** * Callbacks interface that all activities using this fragment must implement. */ public interface NavigationDrawerCallbacks { /** * Called when an item in the navigation drawer is selected. */ void onNavigationDrawerItemSelected(int position); } }