android kotlin - Navigation drawer example

MainActivity.kt

package com.cfsuman.kotlinexamples

import android.content.Context
import android.graphics.Color
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v4.view.GravityCompat
import android.support.v7.app.ActionBarDrawerToggle
import android.view.View
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Configure action bar
        setSupportActionBar(toolbar)
        val actionBar = supportActionBar
        actionBar?.title = "Hello Toolbar"


        // Initialize the action bar drawer toggle instance
        val drawerToggle:ActionBarDrawerToggle = object : ActionBarDrawerToggle(
                this,
                drawer_layout,
                toolbar,
                R.string.drawer_open,
                R.string.drawer_close
        ){
            override fun onDrawerClosed(view:View){
                super.onDrawerClosed(view)
                //toast("Drawer closed")
            }

            override fun onDrawerOpened(drawerView: View){
                super.onDrawerOpened(drawerView)
                //toast("Drawer opened")
            }
        }


        // Configure the drawer layout to add listener and show icon on toolbar
        drawerToggle.isDrawerIndicatorEnabled = true
        drawer_layout.addDrawerListener(drawerToggle)
        drawerToggle.syncState()


        // Set navigation view navigation item selected listener
        navigation_view.setNavigationItemSelectedListener{
            when (it.itemId){
                R.id.action_cut -> toast("Cut clicked")
                R.id.action_copy -> toast("Copy clicked")
                R.id.action_paste -> toast("Paste clicked")
                R.id.action_new ->{
                    // Multiline action
                    toast("New clicked")
                    drawer_layout.setBackgroundColor(Color.RED)
                }

            }
            // Close the drawer
            drawer_layout.closeDrawer(GravityCompat.START)
            true
        }
    }



    // Extension function to show toast message easily
    private fun Context.toast(message:String){
        Toast.makeText(applicationContext,message,Toast.LENGTH_SHORT).show()
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:minHeight="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:elevation="4dp"
            android:fitsSystemWindows="true"
            />
        <TextView
            android:id="@+id/text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Hello Drawer Navigation Example!"
            android:layout_gravity="center"
            android:textSize="30sp"
            android:layout_margin="25dp"
            />
    </LinearLayout>
    <LinearLayout
        android:id="@+id/drawer_header"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_gravity="start"
        android:background="#ebe5ff"
        >
        <TextView
            android:id="@+id/drawer_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Drawer Header"
            android:padding="50dp"
            android:textSize="25sp"
            android:textStyle="bold"
            android:background="#dcfffe"
            />
        <android.support.design.widget.NavigationView
            android:id="@+id/navigation_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:menu="@menu/drawer_menu"
            />
    </LinearLayout>
</android.support.v4.widget.DrawerLayout>

res/menu/drawer_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    >
    <item
        android:id="@+id/action_cut"
        android:title="Cut"
        android:icon="@drawable/ic_action_cut"
        />
    <item
        android:id="@+id/action_copy"
        android:title="Copy"
        android:icon="@drawable/ic_action_copy"
        />
    <item
        android:id="@+id/action_paste"
        android:title="Paste"
        android:icon="@drawable/ic_action_paste"
        />
    <item
        android:id="@+id/action_new"
        android:title="New"
        android:icon="@drawable/ic_action_new"
        />
</menu>

res/values/strings.xml

<resources>
    <string name="app_name">Kotlin - Navigation Drawer Example</string>

    <string name="drawer_open">Open</string>
    <string name="drawer_close">Close</string>
</resources>

res/values/styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

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