Java tutorial
/* * Licensed to UbiCollab.org under one or more contributor * license agreements. See the NOTICE file distributed * with this work for additional information regarding * copyright ownership. UbiCollab.org licenses this file * to you 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.sintef_energy.ubisolar.fragments; import android.app.Activity; import android.app.ActionBar; import android.app.Fragment; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.res.TypedArray; import android.os.Handler; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.content.LocalBroadcastManager; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.content.SharedPreferences; import android.content.res.Configuration; import android.os.Bundle; import android.preference.PreferenceManager; 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.ListView; import com.sintef_energy.ubisolar.Interfaces.IDrawerItem; import com.sintef_energy.ubisolar.R; import com.sintef_energy.ubisolar.adapter.NavDrawerListAdapter; import com.sintef_energy.ubisolar.drawer.DrawerHeader; import com.sintef_energy.ubisolar.drawer.DrawerIDrawerItem; import com.sintef_energy.ubisolar.preferences.PreferencesManager; import com.sintef_energy.ubisolar.utils.Global; import java.util.ArrayList; /** * 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. * * * Modifications by perok: * Followed these steps: http://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer/ */ public class NavigationDrawerFragment extends Fragment { private static final String TAG = NavigationDrawerFragment.class.getName(); /** * Remember the position of the selected item. */ private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position"; /** * Per the design guidelines, you should show the drawer on launch until the user manually * expands it. This shared preference tracks this. */ private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned"; /** * 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 View mFragmentContainerView; private ListView mDrawerList; private String[] mNavMenuTitles; private ArrayList<IDrawerItem> mNavDrawerItems; private NavDrawerListAdapter mAdapter; private DrawerIDrawerItem mUsageDrawerItem; /** The fault startup tab */ private int mCurrentSelectedPosition = 0; private boolean mFromSavedInstanceState; private boolean mUserLearnedDrawer; private PreferencesManager mPreferenceManager; private DataBroadCastReceiver mDataBroadcastManager; public NavigationDrawerFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Read in the flag indicating whether or not the user has demonstrated awareness of the // drawer. See PREF_USER_LEARNED_DRAWER for details. SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false); if (savedInstanceState != null) { mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION); mFromSavedInstanceState = true; } // Select either the default item (0) or the last selected item. selectItem(mCurrentSelectedPosition); mPreferenceManager = PreferencesManager.getInstance(); mDataBroadcastManager = new DataBroadCastReceiver(); } @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); updateUsageDrawItemCount(0); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_navigation_drawer, container, false); // load slide menu items mNavMenuTitles = getResources().getStringArray(R.array.nav_drawer_items); // nav drawer icons from resources TypedArray navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons); mDrawerList = (ListView) rootView.findViewById(R.id.navigation_drawer_list); mNavDrawerItems = new ArrayList<>(); // adding nav drawer items to array // Home //mNavDrawerItems.add(new NavDrawerItem(mNavMenuTitles[0], navMenuIcons.getResourceId(0, -1), true)); mNavDrawerItems.add(new DrawerIDrawerItem(mNavMenuTitles[0])); // View //mNavDrawerItems.add(new NavDrawerItem(mNavMenuTitles[1], navMenuIcons.getResourceId(1, -1), true)); mNavDrawerItems.add(new DrawerHeader(mNavMenuTitles[1])); mUsageDrawerItem = new DrawerIDrawerItem(mNavMenuTitles[2]); mNavDrawerItems.add(mUsageDrawerItem); mNavDrawerItems.add(new DrawerIDrawerItem(mNavMenuTitles[3])); //Manage mNavDrawerItems.add(new DrawerHeader(mNavMenuTitles[4])); mNavDrawerItems.add(new DrawerIDrawerItem(mNavMenuTitles[5])); mNavDrawerItems.add(new DrawerIDrawerItem(mNavMenuTitles[6])); //Socialize mNavDrawerItems.add(new DrawerHeader(mNavMenuTitles[7])); mNavDrawerItems.add(new DrawerIDrawerItem(mNavMenuTitles[8])); //Settings mNavDrawerItems.add(new DrawerHeader(mNavMenuTitles[9])); mNavDrawerItems.add(new DrawerIDrawerItem(mNavMenuTitles[10])); mNavDrawerItems.add(new DrawerIDrawerItem(mNavMenuTitles[11])); // Recycle the typed array navMenuIcons.recycle(); // setting the nav drawer list mAdapter mAdapter = new NavDrawerListAdapter(getActivity().getApplicationContext(), mNavDrawerItems); mDrawerList.setAdapter(mAdapter); mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, final int position, long id) { //For smoother open fragment animation, we first close the drawer, then do a delayed //fragment transaction. mDrawerLayout.closeDrawer(mFragmentContainerView); new Handler().postDelayed(new Runnable() { @Override public void run() { selectItem(position); // your fragment transactions go here } }, 200); //selectItem(position); } }); return rootView; } @Override public void onResume() { super.onResume(); IntentFilter filter = new IntentFilter(); filter.addAction(Global.BROADCAST_NAV_DRAWER); LocalBroadcastManager.getInstance(this.getActivity()).registerReceiver(mDataBroadcastManager, filter); updateUsageDrawItemCount(0); } @Override public void onPause() { super.onPause(); LocalBroadcastManager.getInstance(this.getActivity()).unregisterReceiver(mDataBroadcastManager); } /** * Returns true if the drawer is active * @return */ public boolean isDrawerOpen() { return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView); } /** * 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 main 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 ActionBar actionBar = getActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeButtonEnabled(true); // 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.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.navigation_drawer_open, /* "open drawer" description for accessibility */ R.string.navigation_drawer_close /* "close drawer" description for accessibility */ ) { @Override public void onDrawerClosed(View drawerView) { super.onDrawerClosed(drawerView); if (!isAdded()) { return; } getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu() } @Override public void onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); if (!isAdded()) { return; } if (!mUserLearnedDrawer) { // The user manually opened the drawer; store this flag to prevent auto-showing // the navigation drawer automatically in the future. mUserLearnedDrawer = true; SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply(); } getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu() } }; // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer, // per the navigation drawer design guidelines. if (!mUserLearnedDrawer && !mFromSavedInstanceState) { mDrawerLayout.openDrawer(mFragmentContainerView); } // Defer code dependent on restoration of previous instance state. mDrawerLayout.post(new Runnable() { @Override public void run() { mDrawerToggle.syncState(); } }); mDrawerLayout.setDrawerListener(mDrawerToggle); } private void selectItem(int position) { mCurrentSelectedPosition = position; if (mDrawerList != null) { mDrawerList.setItemChecked(position, true); } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } if (mCallbacks != null) { mCallbacks.onNavigationDrawerItemSelected(position); } } @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 onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition); } @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 global 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.global, menu); showGlobalContextActionBar(); } super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } return super.onOptionsItemSelected(item); } /** * Per the navigation drawer design guidelines, updates the action bar to show the global app * 'context', rather than just what's in the current screen. */ private void showGlobalContextActionBar() { ActionBar actionBar = getActionBar(); actionBar.setDisplayShowTitleEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setTitle(R.string.app_name); } private ActionBar getActionBar() { return getActivity().getActionBar(); } /** * Callbacks interface that all activities using this fragment must implement. */ public static interface NavigationDrawerCallbacks { /** * Called when an item in the navigation drawer is selected. */ void onNavigationDrawerItemSelected(int position); } public IDrawerItem getNavDrawerItem(int position) { return mNavDrawerItems.get(position); } public NavDrawerListAdapter getNavDrawerListAdapter() { return mAdapter; } /** * Hides or shows the original ActionBar. Used in conjunction with the back stack. * * @param state */ public void setNavDrawerToggle(boolean state) { mDrawerToggle.setDrawerIndicatorEnabled(state); } /** * Updated the usage nav drawer with the correct usage. */ private void updateUsageDrawItemCount(int newValue) { int value = mPreferenceManager.getNavDrawerUsage(); value += newValue; if (value > 0) { mUsageDrawerItem.setCount(String.valueOf(value)); } else mUsageDrawerItem.setCount(""); } //TODO Rewrite to static and use WeakReference public class DataBroadCastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (action.equals(Global.BROADCAST_NAV_DRAWER)) { if (intent.hasExtra(Global.DATA_B_NAV_DRAWER_USAGE)) { int value = intent.getIntExtra(Global.DATA_B_NAV_DRAWER_USAGE, -1); updateUsageDrawItemCount(value); } } } } }