Monday, September 22, 2014

Android Custom Navigation Drawer


      
You might have noticed that lot of android applications introduced a sliding panel menu to navigate between major modules of the application. Previously this kind of UI was done using some third party libraries where a list view and some swiping gestures used to achieve this. But now android itself officially introduced sliding panel menu by introducing a newer concept called Navigation Drawer.
Most of the time Sliding Menu (Navigation Drawer) will be hidden and can be shown by swiping the screen from left edge to right or tapping the app icon on the action bar.
In this tutorial we are going to learn how to use navigation drawer to add a sliding menu to your application.
          

Let’s start by creating a new project..

Starting new Project

1. Create a new project in Eclipse from File ⇒ New ⇒ Android Application Project. I had left my main activity name as MainActivity.java and gave the package name as info.androidhive.slidingmenu.
2. I prepared required string variables for List View items and icon names in strings.xml. Open your strings.xml located under res ⇒ values and add the following code.
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <string name="app_name">Slider Menu</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="drawer_open">Slider Menu Opened</string>
    <string name="drawer_close">Slider Menu Closed</string>
     
    <!-- Nav Drawer Menu Items -->
    <string-array name="nav_drawer_items">
        <item >Home</item>
        <item >Find People</item>
        <item >Photos</item>
        <item >Communities</item>
        <item >Pages</item>
        <item >What\'s Hot</item>
    </string-array>
     
    <!-- Nav Drawer List Item Icons -->
    <!-- Keep them in order as the titles are in -->
    <array name="nav_drawer_icons">
        <item>@drawable/ic_home</item>
        <item>@drawable/ic_people</item>
        <item>@drawable/ic_photos</item>
        <item>@drawable/ic_communities</item>
        <item>@drawable/ic_pages</item>
        <item>@drawable/ic_whats_hot</item>
    </array>
     
    <!-- Content Description -->
    <string name="desc_list_item_icon">Item Icon</string>
 
</resources>
3. Android introduced a newer UI element called DrawerLayout for Navigation Drawer. Open your layout file (activity_main.xml) for main activity and type the following code.
Here FrameLayout is used to replace the main content using Fragments and it should be always the first child of the layout for z-index purpose.
activity_main.xml
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <!-- Framelayout to display Fragments -->
    <FrameLayout
        android:id="@+id/frame_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
 
    <!-- Listview to display slider menu -->
    <ListView
        android:id="@+id/list_slidermenu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@color/list_divider"
        android:dividerHeight="1dp"       
        android:listSelector="@drawable/list_selector"
        android:background="@color/list_background"/>
</android.support.v4.widget.DrawerLayout>

Creating Custom List View Adapter

Creating a listview with a icon, title and a counter isn’t straight forward. We have to build a custom listview to achieve this. For this I am going to create a custom adpater class for listview which provides a custom layout for individual list item in the listview.
Before start coding the custom adapter, I am going to create required layout files for the list view.
We need the layout drawables to state the list item state when normal and pressed. It needs overall three xml files. One is for normal state, second is for pressed state and third one to combine both the layouts.
4. So create a xml file under res ⇒ drawable folder named list_item_bg_normal.xml and paste the following code. (If you don’t see drawable folder, create a new folder and name it as drawable)
list_item_bg_normal.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
  <gradient
      android:startColor="@color/list_background"
      android:endColor="@color/list_background"
      android:angle="90" />
</shape>
5. Create another xml layout under res ⇒ drawable named list_item_bg_pressed.xml with following content.
list_item_bg_pressed.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
  <gradient
      android:startColor="@color/list_background_pressed"
      android:endColor="@color/list_background_pressed"
      android:angle="90" />
</shape>
6. Create another xml file to combine both the drawable states under res ⇒ drawable named list_selector.xml
list_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 
    <item android:drawable="@drawable/list_item_bg_normal" android:state_activated="false"/>
    <item android:drawable="@drawable/list_item_bg_pressed" android:state_pressed="true"/>
    <item android:drawable="@drawable/list_item_bg_pressed" android:state_activated="true"/>
 
</selector>
7. We need one more drawable xml for rounde corner background for the counter value. So create a xml file named counter_bg.xml under res ⇒ drawable.
If you want to know how to add a rounded corner border layout, you can learn from How to add Rounded Corner borders to Android Layout
counter_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
 
    <!-- view background color -->
    <solid android:color="@color/counter_text_bg" >
    </solid>
 
    <!-- If you want to add some padding -->
    <padding
        android:right="3dp"
        android:left="3dp" >
    </padding>
 
    <!-- Here is the corner radius -->
    <corners android:radius="2dp" >
    </corners>
 
</shape>
8. As listview has the custom layout, we need another layout file which defines the each list row. So create a layout file under res ⇒ layout named drawer_list_item.xml. This is a relative layout which places the icon, title and counter relative to one another.
drawer_list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="48dp"
    android:background="@drawable/list_selector">
 
    <ImageView
        android:id="@+id/icon"
        android:layout_width="25dp"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="12dp"
        android:layout_marginRight="12dp"
        android:contentDescription="@string/desc_list_item_icon"
        android:src="@drawable/ic_home"
        android:layout_centerVertical="true" />
 
    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_toRightOf="@id/icon"
        android:minHeight="?android:attr/listPreferredItemHeightSmall"
        android:textAppearance="?android:attr/textAppearanceListItemSmall"
        android:textColor="@color/list_item_title"
        android:gravity="center_vertical"
        android:paddingRight="40dp"/>
     
    <TextView android:id="@+id/counter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/counter_bg"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="8dp"
        android:textColor="@color/counter_text_color"/>
 
</RelativeLayout>
As each list item contains three elements icon, title and a counter, I would like create a model to represent each list row.
9. I prefer to create a new package to keep all the model classes. So create a new package named info.androidhive.slidingmenu.model
10. Under model package create a new class named NavDrawerItem.java and paste the following code. Here isCounterVisible defines the visibility of the counter value. If you don’t want to show a counter for a particular list item you can set this to false.
NavDrawerItem.java
package info.androidhive.slidingmenu.model;
 
public class NavDrawerItem {
     
    private String title;
    private int icon;
    private String count = "0";
    // boolean to set visiblity of the counter
    private boolean isCounterVisible = false;
     
    public NavDrawerItem(){}
 
    public NavDrawerItem(String title, int icon){
        this.title = title;
        this.icon = icon;
    }
     
    public NavDrawerItem(String title, int icon, boolean isCounterVisible, String count){
        this.title = title;
        this.icon = icon;
        this.isCounterVisible = isCounterVisible;
        this.count = count;
    }
     
    public String getTitle(){
        return this.title;
    }
     
    public int getIcon(){
        return this.icon;
    }
     
    public String getCount(){
        return this.count;
    }
     
    public boolean getCounterVisibility(){
        return this.isCounterVisible;
    }
     
    public void setTitle(String title){
        this.title = title;
    }
     
    public void setIcon(int icon){
        this.icon = icon;
    }
     
    public void setCount(String count){
        this.count = count;
    }
     
    public void setCounterVisibility(boolean isCounterVisible){
        this.isCounterVisible = isCounterVisible;
    }
}
11. Also create another package to keep all the adapter classes. Create a package named info.androidhive.slidingmenu.adapter.
12. Now we have all the files required for custom list adapter. So create a class named NavDrawerListAdapter.java under adapter package.
NavDrawerListAdapter.java
package info.androidhive.slidingmenu.adapter;
 
import info.androidhive.slidingmenu.R;
import info.androidhive.slidingmenu.model.NavDrawerItem;
 
import java.util.ArrayList;
 
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
 
public class NavDrawerListAdapter extends BaseAdapter {
     
    private Context context;
    private ArrayList<NavDrawerItem> navDrawerItems;
     
    public NavDrawerListAdapter(Context context, ArrayList<NavDrawerItem> navDrawerItems){
        this.context = context;
        this.navDrawerItems = navDrawerItems;
    }
 
    @Override
    public int getCount() {
        return navDrawerItems.size();
    }
 
    @Override
    public Object getItem(int position) {      
        return navDrawerItems.get(position);
    }
 
    @Override
    public long getItemId(int position) {
        return position;
    }
 
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater mInflater = (LayoutInflater)
                    context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            convertView = mInflater.inflate(R.layout.drawer_list_item, null);
        }
          
        ImageView imgIcon = (ImageView) convertView.findViewById(R.id.icon);
        TextView txtTitle = (TextView) convertView.findViewById(R.id.title);
        TextView txtCount = (TextView) convertView.findViewById(R.id.counter);
          
        imgIcon.setImageResource(navDrawerItems.get(position).getIcon());       
        txtTitle.setText(navDrawerItems.get(position).getTitle());
         
        // displaying count
        // check whether it set visible or not
        if(navDrawerItems.get(position).getCounterVisibility()){
            txtCount.setText(navDrawerItems.get(position).getCount());
        }else{
            // hide the counter view
            txtCount.setVisibility(View.GONE);
        }
         
        return convertView;
    }
 
}
Until now we are done creating all the required layouts, model and adapter class for navigation drawer. It’s time to move on to our MainActivity.java and start implementing the navigation drawer.
Following are the major steps we need take care of in the main activity.
> Creating a NavDrawerListAdapter instance and adding list items.
> Assigning the adapter to Navigation Drawer ListView
> Creating click event listener for list items
> Creating and displaying fragment activities on selecting list item.
13. So open your MainActivity.java and add the following code. In the following code, we declared required variables, loaded the list items titles and icons from strings.xml, created an adapter and added each list item. Finally we added a navigation drawer listener.
invalidateOptionsMenu() is called in onDrawerOpened() and onDrawerClosed() to hide and show the action bar icons on navigation drawer opened and closed.
MainActivity.java
public class MainActivity extends Activity {
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;
 
    // nav drawer title
    private CharSequence mDrawerTitle;
 
    // used to store app title
    private CharSequence mTitle;
 
    // slide menu items
    private String[] navMenuTitles;
    private TypedArray navMenuIcons;
 
    private ArrayList<NavDrawerItem> navDrawerItems;
    private NavDrawerListAdapter adapter;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        mTitle = mDrawerTitle = getTitle();
 
        // load slide menu items
        navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
 
        // nav drawer icons from resources
        navMenuIcons = getResources()
                .obtainTypedArray(R.array.nav_drawer_icons);
 
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
 
        navDrawerItems = new ArrayList<NavDrawerItem>();
 
        // adding nav drawer items to array
        // Home
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
        // Find People
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
        // Photos
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
        // Communities, Will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
        // What's hot, We  will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
         
 
        // Recycle the typed array
        navMenuIcons.recycle();
 
        // setting the nav drawer list adapter
        adapter = new NavDrawerListAdapter(getApplicationContext(),
                navDrawerItems);
        mDrawerList.setAdapter(adapter);
 
        // enabling action bar app icon and behaving it as toggle button
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);
 
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, //nav menu toggle icon
                R.string.app_name, // nav drawer open - description for accessibility
                R.string.app_name // nav drawer close - description for accessibility
        ){
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                // calling onPrepareOptionsMenu() to show action bar icons
                invalidateOptionsMenu();
            }
 
            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(mDrawerTitle);
                // calling onPrepareOptionsMenu() to hide action bar icons
                invalidateOptionsMenu();
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);
 
        if (savedInstanceState == null) {
            // on first time display view for first nav item
            displayView(0);
        }
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // toggle nav drawer on selecting action bar app icon/title
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle action bar actions click
        switch (item.getItemId()) {
        case R.id.action_settings:
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }
 
    /***
     * Called when invalidateOptionsMenu() is triggered
     */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // if nav drawer is opened, hide the action items
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }
 
    @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);
    }
Now if you run your project you can see the navigation drawer with a listview. You can open the navigation drawer either clicking on action bar app icon or swiping the screen left edge to right. But you can notice that the click event for list item not working as it is not enabled yet.

Creating Fragment Views for individual List Item

You can see we have Home, Find People, Photos, Communities, Pages and What’s Hot in the list view. Here each list item represents a view where each view needs a Fragment class and a xml layout file.
14. So create a class file named HomeFragment.java and a layout file named fragment_home.xml with following content. For demo purpose I have created very simple layout for this view. You can customize this view depending on your app design.
HomeFragment.java
package info.androidhive.slidingmenu;
 
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
 
public class HomeFragment extends Fragment {
     
    public HomeFragment(){}
     
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
  
        View rootView = inflater.inflate(R.layout.fragment_home, container, false);
          
        return rootView;
    }
}
fragment_home.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
     
    <TextView
        android:id="@+id/txtLabel"
         android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textSize="16dp"
        android:text="Home View"/>
     
    <ImageView android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/txtLabel"
        android:src="@drawable/ic_home"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"/>
     
 
</RelativeLayout>
Also you need to create remaining fragment classes and layout files for other list items.

Handling Navigation Drawer List Item Click Event

When user selects a list item from navigation drawer, we need to display respected view in the main view. This can be done by adding a list item click listener and loading respected fragment view in the call back event.
15. Open the MainActivity.java and add the following code. Here we added a click listener and loaded the related fragment view.
MainActivity.java
public class MainActivity extends Activity {
..
..
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    ..
    mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
    }
 
    /**
     * Slide menu item click listener
     * */
    private class SlideMenuClickListener implements
            ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            // display view for selected nav drawer item
            displayView(position);
        }
    }
 
     /**
     * Diplaying fragment view for selected nav drawer list item
     * */
    private void displayView(int position) {
        // update the main content by replacing fragments
        Fragment fragment = null;
        switch (position) {
        case 0:
            fragment = new HomeFragment();
            break;
        case 1:
            fragment = new FindPeopleFragment();
            break;
        case 2:
            fragment = new PhotosFragment();
            break;
        case 3:
            fragment = new CommunityFragment();
            break;
        case 4:
            fragment = new PagesFragment();
            break;
        case 5:
            fragment = new WhatsHotFragment();
            break;
 
        default:
            break;
        }
 
        if (fragment != null) {
            FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction()
                    .replace(R.id.frame_container, fragment).commit();
 
            // update selected item and title, then close the drawer
            mDrawerList.setItemChecked(position, true);
            mDrawerList.setSelection(position);
            setTitle(navMenuTitles[position]);
            mDrawerLayout.closeDrawer(mDrawerList);
        } else {
            // error in creating fragment
            Log.e("MainActivity", "Error in creating fragment");
        }
    }
}
Now run the project and test the listview click event. You can see respected fragment is loading on selecting the list item. Following is the screenshot of my slider menu.

Final Code

MainActivity.java
MainActivity.java
package info.androidhive.slidingmenu;
 
import info.androidhive.slidingmenu.adapter.NavDrawerListAdapter;
import info.androidhive.slidingmenu.model.NavDrawerItem;
 
import java.util.ArrayList;
 
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
 
public class MainActivity extends Activity {
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;
 
    // nav drawer title
    private CharSequence mDrawerTitle;
 
    // used to store app title
    private CharSequence mTitle;
 
    // slide menu items
    private String[] navMenuTitles;
    private TypedArray navMenuIcons;
 
    private ArrayList<NavDrawerItem> navDrawerItems;
    private NavDrawerListAdapter adapter;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        mTitle = mDrawerTitle = getTitle();
 
        // load slide menu items
        navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
 
        // nav drawer icons from resources
        navMenuIcons = getResources()
                .obtainTypedArray(R.array.nav_drawer_icons);
 
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
 
        navDrawerItems = new ArrayList<NavDrawerItem>();
 
        // adding nav drawer items to array
        // Home
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
        // Find People
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
        // Photos
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
        // Communities, Will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
        // What's hot, We  will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
         
 
        // Recycle the typed array
        navMenuIcons.recycle();
 
        mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
 
        // setting the nav drawer list adapter
        adapter = new NavDrawerListAdapter(getApplicationContext(),
                navDrawerItems);
        mDrawerList.setAdapter(adapter);
 
        // enabling action bar app icon and behaving it as toggle button
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);
 
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, //nav menu toggle icon
                R.string.app_name, // nav drawer open - description for accessibility
                R.string.app_name // nav drawer close - description for accessibility
        ) {
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                // calling onPrepareOptionsMenu() to show action bar icons
                invalidateOptionsMenu();
            }
 
            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(mDrawerTitle);
                // calling onPrepareOptionsMenu() to hide action bar icons
                invalidateOptionsMenu();
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);
 
        if (savedInstanceState == null) {
            // on first time display view for first nav item
            displayView(0);
        }
    }
 
    /**
     * Slide menu item click listener
     * */
    private class SlideMenuClickListener implements
            ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            // display view for selected nav drawer item
            displayView(position);
        }
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // toggle nav drawer on selecting action bar app icon/title
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle action bar actions click
        switch (item.getItemId()) {
        case R.id.action_settings:
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }
 
    /***
     * Called when invalidateOptionsMenu() is triggered
     */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // if nav drawer is opened, hide the action items
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }
 
    /**
     * Diplaying fragment view for selected nav drawer list item
     * */
    private void displayView(int position) {
        // update the main content by replacing fragments
        Fragment fragment = null;
        switch (position) {
        case 0:
            fragment = new HomeFragment();
            break;
        case 1:
            fragment = new FindPeopleFragment();
            break;
        case 2:
            fragment = new PhotosFragment();
            break;
        case 3:
            fragment = new CommunityFragment();
            break;
        case 4:
            fragment = new PagesFragment();
            break;
        case 5:
            fragment = new WhatsHotFragment();
            break;
 
        default:
            break;
        }
 
        if (fragment != null) {
            FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction()
                    .replace(R.id.frame_container, fragment).commit();
 
            // update selected item and title, then close the drawer
            mDrawerList.setItemChecked(position, true);
            mDrawerList.setSelection(position);
            setTitle(navMenuTitles[position]);
            mDrawerLayout.closeDrawer(mDrawerList);
        } else {
            // error in creating fragment
            Log.e("MainActivity", "Error in creating fragment");
        }
    }
 
    @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);
    }
 
}
        







Posted by at

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)