Java tutorial
package org.techbooster.app.abc.fragments; import android.app.Activity; import android.content.Context; import android.content.SharedPreferences; import android.content.res.Configuration; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.ActionBarDrawerToggle; 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.ActionBarActivity; import android.util.Log; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.ListView; import com.sys1yagi.indirectinjector.IndirectInjector; import org.techbooster.app.abc.R; import org.techbooster.app.abc.consts.UrlConsts; import org.techbooster.app.abc.controllers.ActionBarController; import org.techbooster.app.abc.controllers.FragmentTransitionController; import org.techbooster.app.abc.tools.IntentUtils; import javax.inject.Inject; import butterknife.ButterKnife; import butterknife.InjectView; public class NavigationDrawerFragment extends Fragment { private final static String TAG = NavigationDrawerFragment.class.getSimpleName(); private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position"; private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned"; enum Menu { TOP(R.string.menu_top, TopFragment.newInstance()), SUMMARY(R.string.menu_summary, EventSummaryFragment .newInstance()), CONFERENCE(R.string.menu_conference, ConferenceFragment.newInstance()), BAZAAR( R.string.menu_bazaar, BazaarListFragment.newInstance()), MAP(R.string.menu_map, AccessFragment.newInstance()), OFFICIAL_SITE(R.string.menu_official_site, null) { @Override public void transitTo(Context context, FragmentTransitionController fragmentTransitionController) { IntentUtils.openUrl(context, UrlConsts.OFFICIAL_SITE_URL); } }, OBFT(R.string.menu_obft, null) { @Override public void transitTo(Context context, FragmentTransitionController fragmentTransitionController) { IntentUtils.openUrl(context, UrlConsts.OBFT_URL); } }, OSS_LICENSE(R.string.menu_open_source_license, OpenSourceLicenseFragment.newInstance()),; private int mTitleResId; private Fragment mFragment; Menu(int titleId, Fragment fragment) { mTitleResId = titleId; mFragment = fragment; } public int getTitleResId() { return mTitleResId; } public void transitTo(Context context, FragmentTransitionController fragmentTransitionController) { fragmentTransitionController.replaceFragment(mFragment); } } @Inject private FragmentTransitionController mFragmentTransitionController; @Inject private ActionBarController mActionBarController; @Inject private DrawerLayout mDrawerLayout; @Inject private FrameLayout mFragmentContainerView; @InjectView(R.id.menu_list) ListView mDrawerListView; private ActionBarDrawerToggle mDrawerToggle; private int mCurrentSelectedPosition = 2; private boolean mFromSavedInstanceState; private boolean mUserLearnedDrawer; public NavigationDrawerFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false); if (savedInstanceState != null) { mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION); mFromSavedInstanceState = true; } } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); IndirectInjector.inject(getActivity(), this); setHasOptionsMenu(true); setUpNavigationDrawer(); if (savedInstanceState == null) { selectItem(mCurrentSelectedPosition); } } private boolean isClickFooterView(int position) { return mDrawerListView.getCount() - 1 == position; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_navigation_drawer, null, false); ButterKnife.inject(this, view); ImageView jagLink = (ImageView) inflater.inflate(R.layout.listitem_jag_link, null, false); mDrawerListView.addFooterView(jagLink); mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (isClickFooterView(position)) { IntentUtils.openUrl(getActivity(), getString(R.string.jag_link)); return; } selectItem(position); } }); ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, android.R.id.text1); for (Menu menu : Menu.values()) { adapter.add(getString(menu.getTitleResId())); } mDrawerListView.setAdapter(adapter); mDrawerListView.setItemChecked(mCurrentSelectedPosition, true); return view; } public boolean isDrawerOpen() { return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView); } public void setUpNavigationDrawer() { if (mDrawerLayout == null || mFragmentContainerView == null) { Log.i(TAG, "non drawer mode."); return; } mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); ActionBar actionBar = getActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeButtonEnabled(true); mDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout, R.drawable.ic_drawer, R.string.navigation_drawer_open, R.string.navigation_drawer_close) { @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; } if (!mUserLearnedDrawer) { mUserLearnedDrawer = true; SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply(); } getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu() } }; if (!mUserLearnedDrawer && !mFromSavedInstanceState) { mDrawerLayout.openDrawer(mFragmentContainerView); } mDrawerLayout.post(new Runnable() { @Override public void run() { mDrawerToggle.syncState(); } }); mDrawerLayout.setDrawerListener(mDrawerToggle); } private void selectItem(int position) { mCurrentSelectedPosition = position; if (mDrawerListView != null) { mDrawerListView.setItemChecked(position, true); } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } Menu menu = Menu.values()[position]; menu.transitTo(getActivity(), mFragmentTransitionController); } @Override public void onAttach(Activity activity) { super.onAttach(activity); } @Override public void onDetach() { super.onDetach(); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mDrawerToggle.onConfigurationChanged(newConfig); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } return super.onOptionsItemSelected(item); } private ActionBar getActionBar() { return ((ActionBarActivity) getActivity()).getSupportActionBar(); } }