Android Open Source - SimpleNotes Navigation Drawer Fragment

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License

The source code is released under:
Apache License
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Java Source Code

package com.moysa.simplenotes.ui.fragments;
//from  www .j  a v  a  2  s. co m
import android.animation.ObjectAnimator;
import android.app.Activity;
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.view.*;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import com.moysa.simplenotes.R;
import com.moysa.simplenotes.core.NotesUtils;
import com.moysa.simplenotes.ui.adapters.NotesAdapter;
import com.moysa.simplenotes.ui.application.NoteApplication;
import com.moysa.simplenotes.ui.listeners.ListHeaderAnimationListener;

/**
 * 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 {

    /**
     * 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 NoteApplication mNoteApplication;
    private boolean isSearch = false;

    private DrawerLayout mDrawerLayout;
    private ListView mDrawerListView;
    private View mFragmentContainerView;

    private NotesAdapter mArrayAdapter;

    private int mCurrentSelectedPosition = 0;

    private boolean mFromSavedInstanceState;
    private boolean mUserLearnedDrawer;

    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);
    }

    @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) {

        mNoteApplication = NoteApplication.getInstance();

        mArrayAdapter = new NotesAdapter(
                getActionBar().getThemedContext(),
                R.layout.notes_list_item);

        mDrawerListView = (ListView) inflater.inflate(
                R.layout.fragment_navigation_drawer, container, false);

        View listHeader = inflater.inflate(
                R.layout.notes_list_header, container, false);

        setUpListHeader(listHeader);

        mDrawerListView.addHeaderView(listHeader, null, false);
        mDrawerListView.setAdapter(mArrayAdapter);
        mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                selectItem(position);
            }
        });
        mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
        return mDrawerListView;
    }

    private void setUpListHeader(final View listHeader) {

        ImageButton searchButton = (ImageButton) listHeader.findViewById(R.id.search_button);
        ImageButton backButton = (ImageButton) listHeader.findViewById(R.id.back_button);
        ImageButton findButton = (ImageButton) listHeader.findViewById(R.id.find_button);
        EditText searchText = (EditText) listHeader.findViewById(R.id.search_text);

        setUpAnimation(listHeader, searchButton, backButton);
        setUpSearch(listHeader, findButton, searchText);
    }

    private void setUpAnimation(View listHeader, ImageButton searchButton, ImageButton backButton) {
        final ViewGroup standardGroup = (ViewGroup) listHeader.findViewById(R.id.standard_header);
        final ViewGroup searchGroup = (ViewGroup) listHeader.findViewById(R.id.search_header);

        ViewTreeObserver vtoOutdoor = listHeader.getViewTreeObserver();

        vtoOutdoor.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

            @Override
            public void onGlobalLayout() {
                int height = standardGroup.getMeasuredHeight();
                int width = standardGroup.getMeasuredWidth();
                standardGroup.setPivotX(width);
                searchGroup.setPivotX(width);
                standardGroup.setPivotY(height);
                searchGroup.setPivotY(height);

            }
        });

        final ObjectAnimator standardAnimator = ObjectAnimator.ofFloat(searchGroup, "scaleX", 0f, 1f);
        final ObjectAnimator searchAnimator = ObjectAnimator.ofFloat(searchGroup, "scaleX", 1f, 0f);
        standardAnimator.setDuration(200);
        searchAnimator.setDuration(200);

        standardAnimator.addListener(new ListHeaderAnimationListener(standardGroup, searchGroup, false));
        searchAnimator.addListener(new ListHeaderAnimationListener(standardGroup, searchGroup, true));

        searchButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                standardAnimator.start();
            }
        });

        backButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                searchAnimator.start();
                mArrayAdapter.setNotes(mNoteApplication.getNotes());
                isSearch = false;
            }
        });
    }

    private void setUpSearch(View listHeader, ImageButton findButton, final EditText searchText) {

        findButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = searchText.getText().toString();
                mArrayAdapter.setNotes(NotesUtils.searchForText(text, mNoteApplication.getNotes()));
                isSearch = true;
            }
        });
    }

    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().supportInvalidateOptionsMenu(); // 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).commit();
                }

                mCallbacks.onNavigationDrawerOpened();

                getActivity().supportInvalidateOptionsMenu(); // 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 (mDrawerListView != null) {
            mDrawerListView.setItemChecked(position, true);
        }
        if (mDrawerLayout != null) {
            mDrawerLayout.closeDrawer(mFragmentContainerView);
        }
        if (mCallbacks != null) {
            //TODO think how to do it better
            if (isSearch)
                mCallbacks.onNavigationDrawerItemSelected(mNoteApplication.getNotes()
                        .indexOf(mArrayAdapter.getNotes().get(position - 1)));
            else
                mCallbacks.onNavigationDrawerItemSelected(position - 1); //because of header view
        }
    }

    @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) {
        return mDrawerToggle.onOptionsItemSelected(item) || 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 ((ActionBarActivity) getActivity()).getSupportActionBar();
    }

    public NotesAdapter getArrayAdapter() {
        return mArrayAdapter;
    }

    public boolean isSearch() {
        return isSearch;
    }

    /**
     * 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);

        void onNavigationDrawerOpened();
    }
}
Java Source Code List
