Android Open Source - BsuirSchedule Lessons List Activity

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License

The source code is released under:
Copyright 2012 Andrei Senchuk Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Softwar...
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Java Source Code

package net.taviscaron.bsuirschedule.activity;
/*  w  ww .j a  v a  2  s.  c o m*/
import java.util.Date;
import java.util.LinkedList;
import java.util.List;

import net.taviscaron.bsuirschedule.R;
import net.taviscaron.bsuirschedule.adapter.LessonsListAdapter;
import net.taviscaron.bsuirschedule.core.Constants;
import net.taviscaron.bsuirschedule.core.DateUtil;
import net.taviscaron.bsuirschedule.model.Lesson;
import net.taviscaron.bsuirschedule.model.LessonsListModel;
import net.taviscaron.bsuirschedule.model.Schedule;
import net.taviscaron.bsuirschedule.storage.DBHelper;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.TextView;

public class LessonsListActivity extends Activity {
    private static final String TAG = "LessonsListActivity";
    public static final String GROUP_NAME_EXTRA = "groupName";
    public static final String CURRENT_GROUP_BUNDLE_KEY = "currentGroup";
    
    private String currentGroup;
    private List<LessonsListModel> models;
    private DBHelper dbHelper = new DBHelper(this);
    private AsyncTask<Void, Void, Void> lessonsLoadTask;
    
    private PagerAdapter pageAdapter = new PagerAdapter() {
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            LessonsListModel model = models.get(position);
            
            View view = getLayoutInflater().inflate(R.layout.lessons_list, null);
            
            TextView titleView = (TextView) view.findViewById(R.id.lesson_title);
            titleView.setText(model.getTitle());
            
            LessonsListAdapter listAdapter = new LessonsListAdapter(LessonsListActivity.this, model.getCursor());
            ListView lessonsList = (ListView) view.findViewById(R.id.lessons_list);
            lessonsList.setAdapter(listAdapter);
            
            if (position == 0) {
                TextView prevPage = (TextView) view.findViewById(R.id.lesson_pref_page);
                prevPage.setVisibility(View.GONE);
            } else if (position == models.size() - 1) {
                TextView nextPage = (TextView) view.findViewById(R.id.lesson_next_page);
                nextPage.setVisibility(View.GONE);
            }
            
            container.addView(view);
            return view;
        }
        
        @Override
        public int getCount() {
            return (models != null) ? models.size() : 0;
        }
        
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View) object);
        }
        
        @Override
        public boolean isViewFromObject(View container, Object id) {
            return (container == id);
        }
        
        @Override
        public int getItemPosition(Object object) {
            return POSITION_NONE;
        }
    };
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.schedule_screen);
        
        // set state
        Intent intent = getIntent();
        if (intent != null) {
            currentGroup = intent.getStringExtra(GROUP_NAME_EXTRA);
        } else if (savedInstanceState != null) {
            currentGroup = savedInstanceState.getString(CURRENT_GROUP_BUNDLE_KEY);
        }
        
        ViewPager viewPager = (ViewPager) findViewById(R.id.lessons_lists_view_pager);
        viewPager.setAdapter(pageAdapter);
    }
    
    @Override
    protected void onNewIntent(Intent intent) {
        String newGroup = intent.getStringExtra(GROUP_NAME_EXTRA);
        if (newGroup != null && !newGroup.equals(currentGroup)) {
            setIntent(intent);
            currentGroup = newGroup;
        }
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        refreshLists();
        updateLessonsHeaderLaber();
    }
    
    @Override
    protected void onStop() {
        super.onStop();
        
        if (lessonsLoadTask != null) {
            try {
                lessonsLoadTask.cancel(true);
            } catch (NullPointerException e) {
                // ignore
            }
        }
    }
    
    @Override
    protected void onDestroy() {
        super.onDestroy();
        try {
            dbHelper.close();
        } catch (SQLException e) {
            Log.e(TAG, "can't close db connection " + e.getMessage());
        }
    }
    
    @Override
    public void onBackPressed() {
        if(lessonsLoadTask == null) {
            super.onBackPressed();
        }
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.schedule_menu, menu);
        return true;
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Intent intent = null;
        switch (item.getItemId()) {
            case R.id.choose_schedule_menu_item:
                intent = new Intent(this, ManageSchedulesActivity.class);
                startActivity(intent);
                break;
            case R.id.settings_menu_item:
                intent = new Intent(this, SettingsActivity.class);
                startActivity(intent);
                break;
            default:
                return super.onOptionsItemSelected(item);
        }
        return true;
    }
    
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString(CURRENT_GROUP_BUNDLE_KEY, currentGroup);
    }
    
    private void updateLessonsHeaderLaber() {
        Date date = new Date();
        int dayOfWeekIndex = DateUtil.weekDayOfDate(date);
        String dayOfWeek = getResources().getStringArray(R.array.week_days)[dayOfWeekIndex];
        String todayDate = DateUtil.simpleDateFormat(date);
        int workWeek = DateUtil.workWeekFromDate(date);
        
        String result = getString(R.string.lessons_list_header_today_label, todayDate, dayOfWeek, workWeek);
        
        TextView label = (TextView) findViewById(R.id.lessons_list_header_label);
        label.setText(result);
        
        String currentGroupLabel = getString(R.string.lessons_list_header_group_label, currentGroup);
        TextView currentGroupTextView = (TextView) findViewById(R.id.lessons_group);
        currentGroupTextView.setText(currentGroupLabel);
    }
    
    private void refreshLists() {
        new AsyncTask<Void, Void, Void>() {
            private List<LessonsListModel> loadedModels = new LinkedList<LessonsListModel>();
            private String[] regularDaysLabels = getResources().getStringArray(R.array.week_days);
            private SQLiteDatabase db = dbHelper.getReadableDatabase();
            
            protected void onPreExecute() {
                lessonsLoadTask = this;
            }
            
            @Override
            protected Void doInBackground(Void... params) {
                try {
                    String schedId = loadSchedId();
                    
                    addDay(schedId, getString(R.string.week_day_today), DateUtil.today());
                    addDay(schedId, getString(R.string.week_day_tomorrow), DateUtil.tomorrow());
                    
                    addWeekDay(schedId, 0);
                    addWeekDay(schedId, 1);
                    addWeekDay(schedId, 2);
                    addWeekDay(schedId, 3);
                    addWeekDay(schedId, 4);
                    addWeekDay(schedId, 5);
                    addWeekDay(schedId, 6);
                } catch (Exception e) {
                    // ignore all
                }
                return null;
            }
            
            private String loadSchedId() {
                Cursor cursor = db.query(Schedule.TABLE_NAME, null, String.format("%s = '%s'", Schedule.GROUP_ATTR, currentGroup), null, null, null, null);
                cursor.moveToFirst();
                String schedId = cursor.getString(0);
                cursor.close();
                return schedId;
            }
            
            private void addDay(String schedId, String name, Date date) {
                int day = DateUtil.weekDayOfDate(date);
                int week = DateUtil.workWeekFromDate(date);
                String selection = String.format("%s = %d AND %s & (1 << %d) > 0", Lesson.DAY_ATTR, day, Lesson.WEEKS_ATTR, week);
                String label = String.format("%s (%s)", name, regularDaysLabels[day]);
                addModel(schedId, label, selection);
            }
            
            private void addWeekDay(String schedId, int index) {
                addModel(schedId, regularDaysLabels[index], String.format("%s = %d", Lesson.DAY_ATTR, index));
            }
            
            private void addModel(String schedId, String title, String selection) {
                StringBuilder whereCause = new StringBuilder(selection);
                
                // filter by group
                whereCause.append(String.format(" and %s = %s", Lesson.SCHEDULE_ATTR, schedId));
                
                // filter by subgroup
                SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(LessonsListActivity.this);
                String currentSubgroup = sp.getString(Constants.CURRENT_SUBGROUP_PREF_KEY, null);
                if (!TextUtils.isEmpty(currentSubgroup)) {
                    int subgroup = Integer.parseInt(currentSubgroup);
                    whereCause.append(String.format(" and %s & (1 << %d) > 0", Lesson.SUBGROUP_ATTR, subgroup));
                }
                
                String[] orderBy = new String[] { Lesson.TIME_ATTR, Lesson.WEEKS_ATTR, Lesson.SUBGROUP_ATTR, Lesson.SUBJ_ATTR };
                Cursor cursor = db.query(Lesson.TABLE_NAME, null, new String(whereCause), null, null, null, TextUtils.join(",", orderBy));
                if (cursor != null && cursor.moveToFirst()) {
                    startManagingCursor(cursor);
                    loadedModels.add(new LessonsListModel(title, cursor));
                } else {
                    cursor.close();
                }
            }
            
            protected void onCancelled() {
                try {
                    db.close();
                    db = null;
                } catch (SQLException e) {
                    // ignore
                }
            }
            
            @Override
            protected void onPostExecute(Void result) {
                models = loadedModels;
                pageAdapter.notifyDataSetChanged();
                lessonsLoadTask = null;
            }
        }.execute();
    }
}
Java Source Code List
