CafeteriaActivity.java

package de.tum.in.tumcampusapp.activities;

import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

import java.util.List;

import de.tum.in.tumcampusapp.R;
import de.tum.in.tumcampusapp.activities.generic.ActivityForDownloadingExternal;
import de.tum.in.tumcampusapp.adapters.CafeteriaDetailsSectionsPagerAdapter;
import de.tum.in.tumcampusapp.auxiliary.Const;
import de.tum.in.tumcampusapp.auxiliary.NetUtils;
import de.tum.in.tumcampusapp.auxiliary.Utils;
import de.tum.in.tumcampusapp.managers.LocationManager;
import de.tum.in.tumcampusapp.models.cafeteria.Cafeteria;

import static de.tum.in.tumcampusapp.fragments.CafeteriaDetailsSectionFragment.menuToSpan;

/**
 * Lists all dishes at selected cafeteria
 * <p>
 * OPTIONAL: Const.CAFETERIA_ID set in incoming bundle (cafeteria to show)
 */
public class CafeteriaActivity extends ActivityForDownloadingExternal implements AdapterView.OnItemSelectedListener {

    private ViewPager mViewPager;
    private int mCafeteriaId = -1;
    private List<Cafeteria> mCafeterias;

    public CafeteriaActivity() {
        super(Const.CAFETERIAS, R.layout.activity_cafeteria);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Get id from intent if specified
        final Intent intent = getIntent();
        if (intent != null && intent.getExtras() != null && intent.getExtras().containsKey(Const.CAFETERIA_ID)) {
            mCafeteriaId = intent.getExtras().getInt(Const.CAFETERIA_ID);
        }

        mViewPager = (ViewPager) findViewById(R.id.pager);

        /*
         *set pagelimit to avoid losing toggle button state.
         *by default it's 1.
         */
        mViewPager.setOffscreenPageLimit(50);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Add info icon to show ingredients
        getMenuInflater().inflate(R.menu.menu_section_fragment_cafeteria_details, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.action_ingredients) {
            // Build a alert dialog containing the mapping of ingredients to the numbers
            new AlertDialog.Builder(this).setTitle(R.string.action_ingredients)
                    .setMessage(menuToSpan(this, getResources().getString(R.string.cafeteria_ingredients)))
                    .setPositiveButton(android.R.string.ok, null).create().show();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }


    /**
     * Setup action bar navigation (to switch between cafeterias)
     */
    @Override
    protected void onStart() {
        super.onStart();

        // Get all available cafeterias from database
        mCafeterias = new LocationManager(this).getCafeterias();

        // If something went wrong or no cafeterias found
        if (mCafeterias.isEmpty()) {
            if (NetUtils.isConnected(this)) {
                showErrorLayout();
            } else {
                showNoInternetLayout();
            }
            return;
        }

        int selIndex = -1;
        for (int i = 0; i < mCafeterias.size(); i++) {
            Cafeteria c = mCafeterias.get(i);
            if (mCafeteriaId == -1 || mCafeteriaId == c.id) {
                mCafeteriaId = c.id;
                selIndex = i;
                break;
            }
        }

        // Adapter for drop-down navigation
        ArrayAdapter<Cafeteria> adapterCafeterias = new ArrayAdapter<Cafeteria>(this, R.layout.simple_spinner_item_actionbar, android.R.id.text1, mCafeterias) {
            final LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(LAYOUT_INFLATER_SERVICE);

            @Override
            public View getDropDownView(int position, View convertView, ViewGroup parent) {
                View v = inflater.inflate(R.layout.simple_spinner_dropdown_item_actionbar, parent, false);
                Cafeteria c = getItem(position);

                TextView name = (TextView) v.findViewById(android.R.id.text1); // Set name
                TextView address = (TextView) v.findViewById(android.R.id.text2); // Set address
                TextView dist = (TextView) v.findViewById(R.id.distance); // Set distance

                if (c != null) {
                    name.setText(c.name);
                    address.setText(c.address);
                    dist.setText(Utils.formatDist(c.distance));
                }

                return v;
            }
        };

        Spinner spinner = (Spinner) findViewById(R.id.spinnerToolbar);
        spinner.setAdapter(adapterCafeterias);
        spinner.setOnItemSelectedListener(this);
        // Select item
        if (selIndex > -1) {
            spinner.setSelection(selIndex);
        }
    }

    /**
     * Switch cafeteria if a new cafeteria has been selected
     *
     * @param parent the parent view
     * @param pos    index of the new selection
     * @param id     id of the selected item
     */
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        Intent intent = getIntent();
        //check if Activity triggered from favoriteDish Notification
        if (intent != null && intent.getExtras() != null && intent.getExtras().containsKey(Const.MENSA_FOR_FAVORITEDISH)) {
            for (int i = 0; i < parent.getCount(); i++) {
                //get mensaId from extra to redirct the user to it.
                if (intent.getExtras().getInt(Const.MENSA_FOR_FAVORITEDISH) == mCafeterias.get(i).id) {
                    mCafeteriaId = mCafeterias.get(i).id;
                    parent.setSelection(i);
                    intent.removeExtra(Const.MENSA_FOR_FAVORITEDISH);
                    break;
                }
            }
        } else {
            mCafeteriaId = mCafeterias.get(pos).id;
        }


        CafeteriaDetailsSectionsPagerAdapter mSectionsPagerAdapter
                = new CafeteriaDetailsSectionsPagerAdapter(getSupportFragmentManager());
        // Create the adapter that will return a fragment for each of the primary sections of the app.
        mViewPager.setAdapter(null); //unset the adapter for updating
        mSectionsPagerAdapter.setCafeteriaId(this, mCafeteriaId);
        mViewPager.setAdapter(mSectionsPagerAdapter);

    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
        //Don't change anything
    }
}