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NavigationDrawer / src / com.example.android.navigationdrawer /

NavigationDrawerActivity.java

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/*
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 * Copyright (C) 2014 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.navigationdrawer;
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import android.app.Activity;
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import android.app.Fragment;
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import android.app.FragmentManager;
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import android.app.FragmentTransaction;
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import android.app.SearchManager;
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import android.content.Intent;
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import android.content.res.Configuration;
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import android.os.Bundle;
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import android.support.v4.app.ActionBarDrawerToggle;
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import android.support.v4.view.GravityCompat;
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import android.support.v4.widget.DrawerLayout;
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import android.support.v7.widget.RecyclerView;
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import android.view.LayoutInflater;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ImageView;
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import android.widget.Toast;
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import java.util.Locale;
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/**
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 * This example illustrates a common usage of the DrawerLayout widget
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 * in the Android support library.
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 * <p/>
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 * <p>When a navigation (left) drawer is present, the host activity should detect presses of
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 * the action bar's Up affordance as a signal to open and close the navigation drawer. The
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 * ActionBarDrawerToggle facilitates this behavior.
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 * Items within the drawer should fall into one of two categories:</p>
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 * <p/>
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 * <ul>
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 * <li><strong>View switches</strong>. A view switch follows the same basic policies as
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 * list or tab navigation in that a view switch does not create navigation history.
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 * This pattern should only be used at the root activity of a task, leaving some form
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 * of Up navigation active for activities further down the navigation hierarchy.</li>
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 * <li><strong>Selective Up</strong>. The drawer allows the user to choose an alternate
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 * parent for Up navigation. This allows a user to jump across an app's navigation
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 * hierarchy at will. The application should treat this as it treats Up navigation from
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 * a different task, replacing the current task stack using TaskStackBuilder or similar.
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 * This is the only form of navigation drawer that should be used outside of the root
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 * activity of a task.</li>
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 * </ul>
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 * <p/>
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 * <p>Right side drawers should be used for actions, not navigation. This follows the pattern
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 * established by the Action Bar that navigation should be to the left and actions to the right.
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 * An action should be an operation performed on the current contents of the window,
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 * for example enabling or disabling a data overlay on top of the current content.</p>
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 */
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public class NavigationDrawerActivity extends Activity implements PlanetAdapter.OnItemClickListener {
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    private DrawerLayout mDrawerLayout;
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    private RecyclerView mDrawerList;
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    private ActionBarDrawerToggle mDrawerToggle;
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    private CharSequence mDrawerTitle;
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    private CharSequence mTitle;
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    private String[] mPlanetTitles;
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.activity_navigation_drawer);
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        mTitle = mDrawerTitle = getTitle();
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        mPlanetTitles = getResources().getStringArray(R.array.planets_array);
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        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
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        mDrawerList = (RecyclerView) findViewById(R.id.left_drawer);
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        // set a custom shadow that overlays the main content when the drawer opens
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        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
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        // improve performance by indicating the list if fixed size.
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        mDrawerList.setHasFixedSize(true);
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        // set up the drawer's list view with items and click listener
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        mDrawerList.setAdapter(new PlanetAdapter(mPlanetTitles, this));
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        // enable ActionBar app icon to behave as action to toggle nav drawer
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        getActionBar().setDisplayHomeAsUpEnabled(true);
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        getActionBar().setHomeButtonEnabled(true);
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        // ActionBarDrawerToggle ties together the the proper interactions
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        // between the sliding drawer and the action bar app icon
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        mDrawerToggle = new ActionBarDrawerToggle(
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                this,                  /* host Activity */
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                mDrawerLayout,         /* DrawerLayout object */
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                R.drawable.ic_drawer,  /* nav drawer image to replace 'Up' caret */
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                R.string.drawer_open,  /* "open drawer" description for accessibility */
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                R.string.drawer_close  /* "close drawer" description for accessibility */
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        ) {
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            public void onDrawerClosed(View view) {
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                getActionBar().setTitle(mTitle);
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                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
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            }
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            public void onDrawerOpened(View drawerView) {
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                getActionBar().setTitle(mDrawerTitle);
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                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
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            }
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        };
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        mDrawerLayout.setDrawerListener(mDrawerToggle);
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        if (savedInstanceState == null) {
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            selectItem(0);
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        }
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    }
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    @Override
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    public boolean onCreateOptionsMenu(Menu menu) {
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        // Inflate the menu; this adds items to the action bar if it is present.
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        getMenuInflater().inflate(R.menu.navigation_drawer, menu);
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        return true;
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    }
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    /* Called whenever we call invalidateOptionsMenu() */
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    @Override
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    public boolean onPrepareOptionsMenu(Menu menu) {
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        // If the nav drawer is open, hide action items related to the content view
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        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
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        menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
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        return super.onPrepareOptionsMenu(menu);
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    }
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    @Override
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    public boolean onOptionsItemSelected(MenuItem item) {
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        // The action bar home/up action should open or close the drawer.
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        // ActionBarDrawerToggle will take care of this.
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        if (mDrawerToggle.onOptionsItemSelected(item)) {
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            return true;
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        }
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        // Handle action buttons
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        switch (item.getItemId()) {
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            case R.id.action_websearch:
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                // create intent to perform web search for this planet
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                Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
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                intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());
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                // catch event that there's no activity to handle intent
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                if (intent.resolveActivity(getPackageManager()) != null) {
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                    startActivity(intent);
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                } else {
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                    Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();
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                }
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                return true;
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            default:
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                return super.onOptionsItemSelected(item);
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        }
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    }
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    /* The click listener for RecyclerView in the navigation drawer */
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    @Override
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    public void onClick(View view, int position) {
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        selectItem(position);
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    }
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    private void selectItem(int position) {
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        // update the main content by replacing fragments
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        Fragment fragment = PlanetFragment.newInstance(position);
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        FragmentManager fragmentManager = getFragmentManager();
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        FragmentTransaction ft = fragmentManager.beginTransaction();
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        ft.replace(R.id.content_frame, fragment);
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        ft.commit();
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        // update selected item title, then close the drawer
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        setTitle(mPlanetTitles[position]);
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        mDrawerLayout.closeDrawer(mDrawerList);
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    }
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    @Override
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    public void setTitle(CharSequence title) {
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        mTitle = title;
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        getActionBar().setTitle(mTitle);
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    }
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    /**
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     * When using the ActionBarDrawerToggle, you must call it during
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     * onPostCreate() and onConfigurationChanged()...
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     */
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    @Override
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    protected void onPostCreate(Bundle savedInstanceState) {
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        super.onPostCreate(savedInstanceState);
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        // Sync the toggle state after onRestoreInstanceState has occurred.
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        mDrawerToggle.syncState();
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    }
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    @Override
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    public void onConfigurationChanged(Configuration newConfig) {
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        super.onConfigurationChanged(newConfig);
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        // Pass any configuration change to the drawer toggls
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        mDrawerToggle.onConfigurationChanged(newConfig);
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    }
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    /**
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     * Fragment that appears in the "content_frame", shows a planet
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     */
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    public static class PlanetFragment extends Fragment {
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        public static final String ARG_PLANET_NUMBER = "planet_number";
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        public PlanetFragment() {
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            // Empty constructor required for fragment subclasses
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        }
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        public static Fragment newInstance(int position) {
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            Fragment fragment = new PlanetFragment();
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            Bundle args = new Bundle();
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            args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
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            fragment.setArguments(args);
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            return fragment;
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        }
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        @Override
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        public View onCreateView(LayoutInflater inflater, ViewGroup container,
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                                 Bundle savedInstanceState) {
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            View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
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            int i = getArguments().getInt(ARG_PLANET_NUMBER);
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            String planet = getResources().getStringArray(R.array.planets_array)[i];
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            int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
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                    "drawable", getActivity().getPackageName());
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            ImageView iv = ((ImageView) rootView.findViewById(R.id.image));
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            iv.setImageResource(imageId);
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            getActivity().setTitle(planet);
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            return rootView;
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        }
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    }
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}
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