Android Open Source - DroidUPnP Drawer Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (C) 2013 Aurlien Chabot <aurelien@chabot.fr>
 */* w  w w.ja  v a2s  .co  m*/
 * This file is part of DroidUPNP.
 *
 * DroidUPNP 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.
 *
 * DroidUPNP 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 DroidUPNP.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.droidupnp;

import android.app.Fragment;
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.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

/**
 * 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 DrawerFragment extends Fragment {

  /**
   * 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";

  /**
   * Helper component that ties the action bar to the navigation drawer.
   */
  private ActionBarDrawerToggle mDrawerToggle;

  private DrawerLayout mDrawerLayout;
  private View mDrawerView;
  private View mFragmentContainerView;

  private boolean mUserLearnedDrawer;

  public DrawerFragment() {
  }

  @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);
  }

  @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) {
    mDrawerView =  inflater.inflate(
        R.layout.device_fragment, container, false);
    return mDrawerView;
  }

  /**
   * 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.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) {
      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);
  }

  @Override
  public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    // Forward the new configuration the drawer toggle component.
    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();
  }
}

Java Source Code List

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