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 com.veggies.android.todoList; import android.app.ActionBar; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.content.Intent; import android.graphics.drawable.ColorDrawable; 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.BaseAdapter; import android.widget.ListView; import android.widget.SpinnerAdapter; import com.veggies.android.adapter.DrawerItemAdapter; import com.veggies.android.adapter.DropdownMenuItemAdapter; import com.veggies.android.custom.DrawerItem; import com.veggies.android.custom.DropdownMenuItem; import com.veggies.android.model.DBManager; import java.util.ArrayList; import java.util.HashMap; import java.util.List; /** * This example illustrates a common usage of the DrawerLayout widget * in the Android support library. * <p/> * <p>When a navigation (left) drawer is present, the host activity should detect presses of * the action bar's Up affordance as a signal to open and close the navigation drawer. The * ActionBarDrawerToggle facilitates this behavior. * Items within the drawer should fall into one of two categories:</p> * <p/> * <ul> * <li><strong>View switches</strong>. A view switch follows the same basic policies as * list or tab navigation in that a view switch does not create navigation history. * This pattern should only be used at the root activity of a task, leaving some form * of Up navigation active for activities further down the navigation hierarchy.</li> * <li><strong>Selective Up</strong>. The drawer allows the user to choose an alternate * parent for Up navigation. This allows a user to jump across an app's navigation * hierarchy at will. The application should treat this as it treats Up navigation from * a different task, replacing the current task stack using TaskStackBuilder or similar. * This is the only form of navigation drawer that should be used outside of the root * activity of a task.</li> * </ul> * <p/> * <p>Right side drawers should be used for actions, not navigation. This follows the pattern * established by the Action Bar that navigation should be to the left and actions to the right. * An action should be an operation performed on the current contents of the window, * for example enabling or disabling a data overlay on top of the current content.</p> */ public class MainActivity extends Activity { private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; private static final String TYPE = "type"; public static final String EMAIL = "email"; private static final String TODOFRAG = "todofragment"; private CharSequence mDrawerTitle; private CharSequence mTitle; private HashMap<String, Integer> mDrawerItems; private String mEmail = null; private boolean listFragmentFlag = true; //flag for tagging the current fragment public static boolean isDisplayAllList = false; //flag for tagging whether "All List" is chosen in dropdown menu private List<DrawerItem> drawerItemList = new ArrayList<>(); private String[] menuTexts; private List<DropdownMenuItem> dropdownMenuItemList = new ArrayList<>(); private SpinnerAdapter spinnerAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); menuTexts = new String[] { "All Lists", "Default", "Personal", "Shopping", "Wishlist", "Work", "Unfinished" }; dropdownMenuItemList.add(new DropdownMenuItem(R.drawable.ic_list_white_24dp, menuTexts[0])); dropdownMenuItemList.add(new DropdownMenuItem(R.drawable.ic_list_white_24dp, menuTexts[1])); dropdownMenuItemList.add(new DropdownMenuItem(R.drawable.ic_person_pin_white_24dp, menuTexts[2])); dropdownMenuItemList.add(new DropdownMenuItem(R.drawable.ic_local_grocery_store_white_24dp, menuTexts[3])); dropdownMenuItemList.add(new DropdownMenuItem(R.drawable.ic_favorite_white_24dp, menuTexts[4])); dropdownMenuItemList.add(new DropdownMenuItem(R.drawable.ic_card_travel_white_24dp, menuTexts[5])); dropdownMenuItemList.add(new DropdownMenuItem(R.drawable.ic_highlight_off_white_24dp, menuTexts[6])); spinnerAdapter = new DropdownMenuItemAdapter(this, dropdownMenuItemList); //get the email passed by login UI Intent intent = this.getIntent(); mEmail = intent.getStringExtra(EMAIL); mTitle = mDrawerTitle = getTitle(); //put the drawer items in a hash map, so we can just use it to lookup index mDrawerItems = new HashMap<>(); String[] drawerArray = getResources().getStringArray(R.array.drawer_array); for (int i = 0; i < drawerArray.length; i++) { mDrawerItems.put(drawerArray[i], i); } drawerItemList.add(new DrawerItem(R.drawable.ic_list_white_24dp, "Todo List")); drawerItemList.add(new DrawerItem(R.drawable.ic_settings_white_24dp, "Setting")); BaseAdapter adapter = new DrawerItemAdapter(this, drawerItemList); 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(adapter); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); // enable ActionBar app icon to behave as action to toggle nav drawer ActionBar actionbar = getActionBar(); actionbar.setDisplayHomeAsUpEnabled(true); actionbar.setHomeButtonEnabled(true); getActionBar().setIcon(R.drawable.logo_white); ColorDrawable colorDrawable = new ColorDrawable(); colorDrawable.setColor(0xff303F9F); getActionBar().setBackgroundDrawable(colorDrawable); // 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); if (listFragmentFlag) { setActionMenu(); } invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } public void onDrawerOpened(View drawerView) { getActionBar().setTitle(mDrawerTitle); hideActionMenu(); 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 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); } } private void selectItem(int position) { String[] drawer_array = getResources().getStringArray(R.array.drawer_array); if (position == mDrawerItems.get(this.getResources().getString(R.string.drawer_item_list))) { listFragmentFlag = true; setActionMenu(); Bundle data = new Bundle(); data.putInt(TYPE, 5); //selected To-do list // update the main content by replacing fragments Fragment fragment = new ListViewFragment(); fragment.setArguments(data); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment, TODOFRAG).commit(); } else if (position == mDrawerItems.get(this.getResources().getString(R.string.drawer_item_setting))) { listFragmentFlag = false; hideActionMenu(); //selected setting // update the main content by replacing fragments Fragment fragment = new SettingFragment(); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); } // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); setTitle(drawer_array[position]); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = this.getResources().getString(R.string.taski); 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(); } private void setActionMenu() { isDisplayAllList = false; ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST); actionBar.setListNavigationCallbacks(spinnerAdapter, new DropDownListenser()); } private void hideActionMenu() { ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); } @Override protected void onSaveInstanceState(Bundle outState) { //No call for super(). Bug on API Level > 11. } class DropDownListenser implements ActionBar.OnNavigationListener { String[] listTypes = getResources().getStringArray(R.array.types); @Override public boolean onNavigationItemSelected(int itemPosition, long itemId) { Bundle data = new Bundle(); int pos; if (itemPosition == 0) { pos = DBManager.LIST_TYPE_ALL; //all list isDisplayAllList = false; } else if (itemPosition <= 5) { pos = itemPosition - 1; isDisplayAllList = false; } else { pos = DBManager.LIST_TYPE_UNFINISHED; //unfinished list isDisplayAllList = true; } data.putInt(TYPE, pos); listFragmentFlag = true; // update the main content by replacing fragments Fragment fragment = new ListViewFragment(); fragment.setArguments(data); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment, TODOFRAG).commit(); return true; } } }