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.bewareofraj.mytvtracker; import android.annotation.TargetApi; import android.app.Activity; import android.app.FragmentManager; import android.content.Intent; import android.content.res.Configuration; import android.os.Build; 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; import com.bewareofraj.mytvtracker.search.SearchFragment; import com.bewareofraj.mytvtracker.watchlist.WatchListFragment; /** * 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; public static ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; private CharSequence mDrawerTitle; private CharSequence mTitle; private static String[] mMenuItems; /** * The search screen id */ public static final int SCREEN_SEARCH = 1; @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTitle = mDrawerTitle = getTitle(); mMenuItems = getResources().getStringArray(R.array.main_menu_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, mMenuItems)); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); // enable ActionBar app icon to behave as action to toggle nav drawer getActionBar().setDisplayHomeAsUpEnabled(true); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { 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); } // Load Watch List by default WatchListFragment fragment = new WatchListFragment(); FragmentManager fm = getFragmentManager(); fm.beginTransaction().replace(R.id.content_frame, fragment).commit(); } @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_about).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_about: Intent aboutIntent = new Intent(this, AboutActivity.class); startActivity(aboutIntent); 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[] items = getResources().getStringArray(R.array.main_menu_items); if (items[position].equals("Watch List")) { WatchListFragment fragment = new WatchListFragment(); FragmentManager fm = getFragmentManager(); fm.beginTransaction().replace(R.id.content_frame, fragment).commit(); } else if (items[position].equals("Search")) { SearchFragment fragment = new SearchFragment(); FragmentManager fm = getFragmentManager(); fm.beginTransaction().replace(R.id.content_frame, fragment).commit(); } // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); setTitle(mMenuItems[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); } }