Android navigation drawer using RecyclerView
Dependencies in the app gradle.
implementation 'com.android.support:appcompat-v7:26.1.0' implementation 'com.android.support:design:26.1.0' implementation 'com.android.support:recyclerview-v7:26.0.+'
DrawerFragment.kt, the drawer implementation in a fragment with all the ui listeners for clicking and touching events from the RecyclerView. Those events are passed back to the activity through FragmentDrawerListener, and the activity will decide what to do with these events.
import android.content.Context
import android.os.Bundle
import android.support.v4.app.Fragment
import android.support.v4.widget.DrawerLayout
import android.support.v7.app.ActionBarDrawerToggle
import android.support.v7.widget.LinearLayoutManager
import android.support.v7.widget.RecyclerView
import android.support.v7.widget.Toolbar
import android.view.GestureDetector
import android.view.LayoutInflater
import android.view.MotionEvent
import android.view.View
import android.view.ViewGroup
import com.example.androidnavigationdrawerrecyclerview.adapter.DrawerAdapter
import com.example.androidnavigationdrawerrecyclerview.data.DrawerItem
import kotlinx.android.synthetic.main.fragment_drawer.*
import java.util.ArrayList
class DrawerFragment : Fragment() {
private lateinit var adapter: DrawerAdapter
private var drawerListener: FragmentDrawerListener? = null
private var mDrawerLayout: DrawerLayout? = null
private var containerView: View? = null
override fun onAttach(context: Context?) {
super.onAttach(context)
try {
drawerListener = context as FragmentDrawerListener
} catch (e : RuntimeException) {
e.printStackTrace()
}
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_drawer, container, false)
}
override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
var titles = activity.resources.getStringArray(R.array.nav_drawer_labels)
val data = ArrayList()
for (i in titles.indices) {
val navItem = DrawerItem(title = titles[i])
data.add(navItem)
}
adapter = DrawerAdapter(data)
rv_drawer_list.adapter = adapter
rv_drawer_list.layoutManager = LinearLayoutManager(activity)
rv_drawer_list.addOnItemTouchListener(RecyclerTouchListener(activity, rv_drawer_list, object : ClickListener {
override fun onClick(view: View, position: Int) {
drawerListener?.onDrawerItemSelected(view, position)
mDrawerLayout?.closeDrawer(containerView)
}
override fun onLongClick(view: View?, position: Int) {
}
}))
}
fun init(fragmentId: Int, drawerLayout: DrawerLayout, toolbar: Toolbar) {
containerView = activity.findViewById(fragmentId)
mDrawerLayout = drawerLayout
val drawerToggle = object : ActionBarDrawerToggle(activity, drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
override fun onDrawerOpened(drawerView: View?) {
super.onDrawerOpened(drawerView)
activity.invalidateOptionsMenu()
}
override fun onDrawerClosed(drawerView: View?) {
super.onDrawerClosed(drawerView)
activity.invalidateOptionsMenu()
}
override fun onDrawerSlide(drawerView: View?, slideOffset: Float) {
super.onDrawerSlide(drawerView, slideOffset)
toolbar.alpha = 1 - slideOffset / 2
}
}
mDrawerLayout?.addDrawerListener(drawerToggle)
mDrawerLayout?.post { drawerToggle.syncState() }
}
interface ClickListener {
fun onClick(view: View, position: Int)
fun onLongClick(view: View?, position: Int)
}
internal class RecyclerTouchListener(context: Context, recyclerView: RecyclerView, private val clickListener: ClickListener?) : RecyclerView.OnItemTouchListener {
private val gestureDetector: GestureDetector
init {
gestureDetector = GestureDetector(context, object : GestureDetector.SimpleOnGestureListener() {
override fun onSingleTapUp(e: MotionEvent): Boolean {
return true
}
override fun onLongPress(e: MotionEvent) {
val child = recyclerView.findChildViewUnder(e.x, e.y)
if (child != null && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildAdapterPosition(child))
}
}
})
}
override fun onInterceptTouchEvent(rv: RecyclerView, e: MotionEvent): Boolean {
val child = rv.findChildViewUnder(e.x, e.y)
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildAdapterPosition(child))
}
return false
}
override fun onTouchEvent(rv: RecyclerView, e: MotionEvent) {}
override fun onRequestDisallowInterceptTouchEvent(disallowIntercept: Boolean) {
}
}
interface FragmentDrawerListener {
fun onDrawerItemSelected(view: View, position: Int)
}
}
MainAcitvity.kt, the activity implements the FragmentDrawerListener and receives the ui events happening from the drawer in the fragment. It process the event in the function displayView.
import android.os.Bundle
import android.support.v4.app.Fragment
import android.support.v7.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import android.view.View
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity(), DrawerFragment.FragmentDrawerListener {
private lateinit var drawerFragment: DrawerFragment
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
drawerFragment = supportFragmentManager.findFragmentById(R.id.fragment_navigation_drawer) as DrawerFragment
drawerFragment.init(R.id.fragment_navigation_drawer, drawer_layout, toolbar)
displayView(0)
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the menu; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.menu_main, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
return when (item.itemId) {
R.id.action_settings -> true
else -> super.onOptionsItemSelected(item)
}
}
override fun onBackPressed() {
if (drawer_layout.isDrawerOpen(GravityCompat.START)) {
drawer_layout.closeDrawer(GravityCompat.START)
} else {
super.onBackPressed()
}
}
override fun onDrawerItemSelected(view: View, position: Int) {
displayView(position)
}
private fun displayView(position: Int) {
var fragment: Fragment? = null
var title = getString(R.string.app_name)
when (position) {
0 -> {
fragment = AFragment()
title = getString(R.string.nav_item_one)
}
1 -> {
fragment = BFragment()
title = getString(R.string.nav_item_two)
}
2 -> {
fragment = CFragment()
title = getString(R.string.nav_item_three)
}
else -> {
}
}
if (fragment != null) {
val fragmentManager = supportFragmentManager
val fragmentTransaction = fragmentManager.beginTransaction()
fragmentTransaction.replace(R.id.main_content, fragment)
fragmentTransaction.commit()
supportActionBar?.title = title
}
}
}
AFragment.kt, one of the fragments that is being displayed by the activity.
import android.os.Bundle
import android.support.v4.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import kotlinx.android.synthetic.main.fragment_layout.*
class AFragment : Fragment() {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_layout, container, false)
}
override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
tv_label.text = "One"
}
}
activity_main.xml, the layout for the main activity. A drawerlayout with a custom implementation of the navigation draw in a fragment instead of the NavigationView provided by the design support library.
Custom navigation drawer with recyclerview only, no fragment
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