Java tutorial
/* * Copyright 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package edu.scranton.fisherc5.busybusy; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.GregorianCalendar; import edu.scranton.fisherc5.busybusy.db.schema.DatabaseCreator; import edu.scranton.fisherc5.busybusy.utils.Keys; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.content.res.Configuration; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; public class MainActivity extends Activity implements UpdateFragment.CreateNewActivityListener, PreCompareFragment.onCompareButtonListener { private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; private CharSequence mDrawerTitle; private CharSequence mTitle; private String[] mNavItems; private boolean mDateInActionBar = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTitle = mDrawerTitle = getTitle(); mNavItems = getResources().getStringArray(R.array.nav_items); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); // 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 mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, mNavItems)); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); // enable ActionBar app icon to behave as action to toggle nav drawer getActionBar().setDisplayHomeAsUpEnabled(true); getActionBar().setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the sliding drawer and the action bar app icon mDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */ mDrawerLayout, /* DrawerLayout object */ R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.drawer_open, /* "open drawer" description for accessibility */ R.string.drawer_close /* "close drawer" description for accessibility */ ) { public void onDrawerClosed(View view) { getActionBar().setTitle(mTitle); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } public void onDrawerOpened(View drawerView) { getActionBar().setTitle(mDrawerTitle); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { selectItem(0); } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main, menu); return super.onCreateOptionsMenu(menu); } /* Called whenever we call invalidateOptionsMenu() */ @Override public boolean onPrepareOptionsMenu(Menu menu) { // If the nav drawer is open, hide action items related to the content view boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList); // menu.findItem(R.id.action_websearch).setVisible(!drawerOpen); return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // The action bar home/up action should open or close the drawer. // ActionBarDrawerToggle will take care of this. if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } // Handle action buttons switch (item.getItemId()) { // case R.id.action_websearch: // // create intent to perform web search for this planet // Intent intent = new Intent(Intent.ACTION_WEB_SEARCH); // intent.putExtra(SearchManager.QUERY, getActionBar().getTitle()); // // catch event that there's no activity to handle intent // if (intent.resolveActivity(getPackageManager()) != null) { // startActivity(intent); // } else { // Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show(); // } // return true; default: return super.onOptionsItemSelected(item); } } /* The click listner for ListView in the navigation drawer */ private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } } @Override public void createNewActivity() { selectItem(3); } //if a date has been set in the ActionBar, and we are navigating out of the // date view using the back button, make sure the ActionBar is set back // to "Compare" @Override public void onBackPressed() { super.onBackPressed(); if (mDateInActionBar) { mDrawerList.setItemChecked(1, true); setTitle(mNavItems[1]); } } public void setDailyViewFragment(Bundle args) { Fragment dailyViewFrag = new DailyViewFragment(); dailyViewFrag.setArguments(args); SimpleDateFormat format = new SimpleDateFormat("MMMM d, yyyy"); Calendar temp = new GregorianCalendar(); temp.setTimeInMillis(args.getLong(Keys.SELECTED_DATE_KEY)); getActionBar().setTitle(format.format(temp.getTime())); mDateInActionBar = true; //SET TRANSACTION. ADD TO BACK STACK FragmentTransaction transaction = getFragmentManager().beginTransaction(); transaction.replace(R.id.content_frame, dailyViewFrag, "PRE_COMPARE"); transaction.addToBackStack("PRE_COMPARE_PUSH"); transaction.commit(); } private void selectItem(int position) { // update the main content by replacing fragments FragmentManager fragmentManager = getFragmentManager(); if (fragmentManager.findFragmentByTag("PRE_COMPARE") != null) { fragmentManager.popBackStack("PRE_COMPARE_PUSH", FragmentManager.POP_BACK_STACK_INCLUSIVE); } switch (position) { case 0: Fragment updateFrag = new UpdateFragment(); fragmentManager.beginTransaction().replace(R.id.content_frame, updateFrag).commit(); break; case 1: Fragment precompareFrag = new PreCompareFragment(); fragmentManager.beginTransaction().replace(R.id.content_frame, precompareFrag).commit(); break; case 3: Fragment updateActivityFrag = new UpdateUserActivityFragment(); fragmentManager.beginTransaction().replace(R.id.content_frame, updateActivityFrag).commit(); break; } // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); setTitle(mNavItems[position]); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = title; getActionBar().setTitle(mTitle); } /** * When using the ActionBarDrawerToggle, you must call it during * onPostCreate() and onConfigurationChanged()... */ @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggls mDrawerToggle.onConfigurationChanged(newConfig); } }