Android Open Source - APO-DZ-Android Navigation Drawer Fragment

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License

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

package org.upennapo.app.fragment;
//from w  ww  .  ja v a 2 s  .c o  m

import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.graphics.Typeface;
import android.net.Uri;
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.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.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Switch;

import org.upennapo.app.R;
import org.upennapo.app.activity.LoginActivity;
import org.upennapo.app.activity.MainActivity;

/**
 * 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 implements View.OnClickListener,
        CompoundButton.OnCheckedChangeListener, RadioGroup.OnCheckedChangeListener {

    /**
     * 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 CharSequence mCurrentTitle;
    private CharSequence mCurrentSubtitle = null;
    private int mCurrentSelectedPosition = R.id.btn_section1;
    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 (R.id.btn_section1) 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) {
        View rootView =
                inflater.inflate(R.layout.fragment_alum_mode_navigation_drawer, container, false);

        // Set up sections
        RadioGroup sections = (RadioGroup) rootView.findViewById(R.id.nav_sections);
        sections.setOnCheckedChangeListener(this);
        sections.check(mCurrentSelectedPosition);

        // Bold the currently selected item.
        RadioButton currentSection = (RadioButton) sections.findViewById(mCurrentSelectedPosition);
        currentSection.setTypeface(Typeface.DEFAULT_BOLD);

        mCurrentTitle = currentSection.getText();

        // Attach buttons.
        rootView.findViewById(R.id.btn_about).setOnClickListener(this);
        rootView.findViewById(R.id.btn_send_feedback).setOnClickListener(this);
        rootView.findViewById(R.id.btn_sign_out).setOnClickListener(this);

        Switch alumModeToggle = (Switch) rootView.findViewById(R.id.switch_alum_mode);
        alumModeToggle.setChecked(LoginActivity.isAlumniModeDefault(getActivity()));
        alumModeToggle.setOnCheckedChangeListener(this);

        return rootView;
    }

    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;
                }
                setSubtitle(mCurrentSubtitle);
                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();
                }

                mCurrentSubtitle = getActionBar().getSubtitle();
                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 (mDrawerLayout != null) {
            mDrawerLayout.closeDrawer(mFragmentContainerView);
        }
        if (mCallbacks != null) {
            mCurrentSubtitle = mCallbacks.getItemSubtitle(position);
            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;
        }
        switch (item.getItemId()) {

            default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_about:
                final String githubPageUrl = getString(R.string.menu_about_app_url);
                Intent openGithubPage = new Intent(Intent.ACTION_VIEW, Uri.parse(githubPageUrl));
                startActivity(openGithubPage);
                break;

            case R.id.btn_send_feedback:
                final String feedbackFormUrl = getString(R.string.menu_report_bug_url);
                Intent openFeedbackForm = new Intent(Intent.ACTION_VIEW, Uri.parse(feedbackFormUrl));
                startActivity(openFeedbackForm);
                break;

            case R.id.btn_sign_out:
                Intent openLoginScreen = new Intent(getActivity(), LoginActivity.class);
                openLoginScreen.putExtra(LoginActivity.LOGOUT_INTENT, true);
                startActivity(openLoginScreen);
                getActivity().finish();
                break;
        }
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        Activity parentActivity = getActivity();
        LoginActivity.setAlumniModeDefault(parentActivity, isChecked);

        if (!isChecked) {
            // Switch to active brother mode
            Intent openAppIntent = new Intent(parentActivity, MainActivity.class);
            startActivity(openAppIntent);
            parentActivity.finish();
        }
    }

    @Override
    public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
        // Reset checked item.
        RadioButton lastChecked = (RadioButton) radioGroup.findViewById(mCurrentSelectedPosition);
        lastChecked.setTypeface(Typeface.DEFAULT);

        // Bold current item.
        RadioButton newChecked = (RadioButton) radioGroup.findViewById(checkedId);
        newChecked.setTypeface(Typeface.DEFAULT_BOLD);
        mCurrentTitle = newChecked.getText();

        selectItem(checkedId);
    }

    public CharSequence getCurrentItemTitle() {
        return mCurrentTitle;
    }

    /**
     * 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);
        actionBar.setSubtitle(null);
    }

    private ActionBar getActionBar() {
        return getActivity().getActionBar();
    }

    private void setSubtitle(CharSequence subtitle) {
        getActionBar().setSubtitle(subtitle);
    }

    /**
     * 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);

        CharSequence getItemSubtitle(int position);
    }
}
Java Source Code List
