团队冲刺第二阶段07

今天主要学习并完成Navigation部分

代码如下 

public class NavigationDrawerFragment extends Fragment {

  static final int BURGER = 0;
  static final int ARROW = 1;

  ActionBarDrawerToggle mDrawerToggle;
  DrawerLayout mDrawerLayout;
  private MainActivity mActivity;
  private boolean alreadyInitialized;


  @Override
  public void onCreate (Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setRetainInstance(true);
  }


  @Override
  public void onStart () {
    super.onStart();
    EventBus.getDefault().register(this);
  }


  @Override
  public void onStop () {
    super.onStop();
    EventBus.getDefault().unregister(this);
  }


  @Override
  public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
  }


  @Override
  public void onActivityCreated (Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    mActivity = (MainActivity) getActivity();
    init();
  }


  private MainActivity getMainActivity () {
    return (MainActivity) getActivity();
  }


  public void onEventMainThread (DynamicNavigationReadyEvent event) {
    if (alreadyInitialized) {
      alreadyInitialized = false;
    } else {
      refreshMenus();
    }
  }


  public void onEvent (CategoriesUpdatedEvent event) {
    refreshMenus();
  }


  public void onEventAsync (NotesUpdatedEvent event) {
    alreadyInitialized = false;
  }


  public void onEvent (NotesLoadedEvent event) {
    if (mDrawerLayout != null) {
      if (!isDoublePanelActive()) {
        mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
      }
    }
    if (getMainActivity().getSupportFragmentManager().getBackStackEntryCount() == 0) {
      init();
    }
    refreshMenus();
    alreadyInitialized = true;
  }


  public void onEvent (SwitchFragmentEvent event) {
    if (CHILDREN.equals(event.direction)) {
      animateBurger(ARROW);
    } else {
      animateBurger(BURGER);
    }
  }


  public void onEvent (NavigationUpdatedEvent navigationUpdatedEvent) {
    if (navigationUpdatedEvent.navigationItem.getClass().isAssignableFrom(NavigationItem.class)) {
      mActivity.getSupportActionBar().setTitle(((NavigationItem) navigationUpdatedEvent.navigationItem).getText());
    } else {
      mActivity.getSupportActionBar().setTitle(((Category) navigationUpdatedEvent.navigationItem).getName());
    }
    if (mDrawerLayout != null) {
      if (!isDoublePanelActive()) {
        mDrawerLayout.closeDrawer(GravityCompat.START);
      }
      new Handler().postDelayed(() -> EventBus.getDefault().post(new NavigationUpdatedNavDrawerClosedEvent
          (navigationUpdatedEvent.navigationItem)), 400);
    }
  }


  public void init () {
    LogDelegate.v("Started navigation drawer initialization");

    mDrawerLayout = mActivity.findViewById(R.id.drawer_layout);
    mDrawerLayout.setFocusableInTouchMode(false);

    View leftDrawer = getView().findViewById(R.id.left_drawer);
    int leftDrawerBottomPadding = Display.getNavigationBarHeightKitkat(getActivity());
    leftDrawer.setPadding(leftDrawer.getPaddingLeft(), leftDrawer.getPaddingTop(), leftDrawer.getPaddingRight(),
        leftDrawerBottomPadding);

    mDrawerToggle = new ActionBarDrawerToggle(mActivity,
        mDrawerLayout,
        getMainActivity().getToolbar(),
        R.string.drawer_open,
        R.string.drawer_close
    ) {
      public void onDrawerClosed (View view) {
        mActivity.supportInvalidateOptionsMenu();
      }


      public void onDrawerOpened (View drawerView) {
        mActivity.commitPending();
        mActivity.finishActionMode();
      }
    };

    if (isDoublePanelActive()) {
      mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN);
    }

    // Styling options
    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
    mDrawerLayout.addDrawerListener(mDrawerToggle);
    mDrawerToggle.setDrawerIndicatorEnabled(true);

    LogDelegate.v("Finished navigation drawer initialization");
  }


  private void refreshMenus () {
    buildMainMenu();
    LogDelegate.v("Finished main menu initialization");
    buildCategoriesMenu();
    LogDelegate.v("Finished categories menu initialization");
    mDrawerToggle.syncState();
  }


  private void buildCategoriesMenu () {
    CategoryMenuTask task = new CategoryMenuTask(this);
    task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
  }


  private void buildMainMenu () {
    MainMenuTask task = new MainMenuTask(this);
    task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
  }


  void animateBurger (int targetShape) {
    if (mDrawerToggle != null) {
      if (targetShape != BURGER && targetShape != ARROW) {
        return;
      }
      ValueAnimator anim = ValueAnimator.ofFloat((targetShape + 1) % 2, targetShape);
      anim.addUpdateListener(valueAnimator -> {
        float slideOffset = (Float) valueAnimator.getAnimatedValue();
        mDrawerToggle.onDrawerSlide(mDrawerLayout, slideOffset);
      });
      anim.setInterpolator(new DecelerateInterpolator());
      anim.setDuration(500);
      anim.start();
    }
  }


  public static boolean isDoublePanelActive () {
resources.getDimension(R.dimen
    return false;
  }

}