Shows and hides keyboard when scrolling the app drawer

app/src/main/AndroidManifest.xml

@@ -26,6 +26,7 @@
             android:screenOrientation="portrait"
             android:stateNotNeeded="true"
             tools:ignore="LockedOrientationActivity"
+            android:windowSoftInputMode="adjustNothing"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/com/sduduzog/slimlauncher/ui/main/HomeFragment.kt

@@ -5,11 +5,14 @@ import android.content.*
 import android.content.pm.LauncherApps
 import android.net.Uri
 import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
 import android.os.UserManager
 import android.provider.AlarmClock
 import android.provider.CalendarContract
 import android.provider.MediaStore
 import android.provider.Settings
+import android.util.Log
 import android.view.LayoutInflater
 import android.view.MenuItem
 import android.view.View
@@ -20,6 +23,9 @@ import android.widget.PopupMenu
 import android.widget.Toast
 import androidx.constraintlayout.motion.widget.MotionLayout
 import androidx.constraintlayout.motion.widget.MotionLayout.TransitionListener
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsAnimationCompat
+import androidx.core.view.WindowInsetsCompat
 import androidx.fragment.app.viewModels
 import androidx.lifecycle.lifecycleScope
 import androidx.navigation.Navigation
@@ -34,8 +40,11 @@ import com.sduduzog.slimlauncher.datasource.quickbuttonprefs.QuickButtonPreferen
 import com.sduduzog.slimlauncher.models.HomeApp
 import com.sduduzog.slimlauncher.models.MainViewModel
 import com.sduduzog.slimlauncher.ui.dialogs.RenameAppDisplayNameDialog
+import com.sduduzog.slimlauncher.utils.AppDrawerScrollListener
 import com.sduduzog.slimlauncher.utils.BaseFragment
 import com.sduduzog.slimlauncher.utils.OnLaunchAppListener
+import com.sduduzog.slimlauncher.utils.isKeyboardOpen
+import com.sduduzog.slimlauncher.utils.shouldOpenKeyboard
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.android.synthetic.main.home_fragment_default.*
 import kotlinx.android.synthetic.main.home_fragment_content.*
@@ -55,6 +64,12 @@ class HomeFragment : BaseFragment(), OnLaunchAppListener {
 
     private lateinit var receiver: BroadcastReceiver
     private lateinit var appDrawerAdapter: AppDrawerAdapter
+    private lateinit var inputMethodManager: InputMethodManager
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        inputMethodManager = requireContext().getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
+    }
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
         val coreRepository = unlauncherDataSource.corePreferencesRepo
@@ -221,9 +236,8 @@ class HomeFragment : BaseFragment(), OnLaunchAppListener {
             }
 
         home_fragment.setTransitionListener(object : TransitionListener {
+            val handler = Handler(Looper.getMainLooper())
             override fun onTransitionCompleted(motionLayout: MotionLayout?, currentId: Int) {
-                val inputMethodManager = requireContext().getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
-
                 when (currentId) {
                     motionLayout?.startState -> {
                         // hide the keyboard and remove focus from the EditText when swiping back up
@@ -237,14 +251,17 @@ class HomeFragment : BaseFragment(), OnLaunchAppListener {
                         val activateKeyboard = repository.get().activateKeyboardInDrawer
 
                         // Check for preferences to open the keyboard
-                        // only if the search field is shown
-                        if (showSearchField && activateKeyboard) {
-                            app_drawer_edit_text.requestFocus()
-                            // show the keyboard and set focus to the EditText when swiping down
-                            inputMethodManager.showSoftInput(
-                                app_drawer_edit_text,
-                                InputMethodManager.SHOW_IMPLICIT
-                            )
+                        if (shouldOpenKeyboard(unlauncherDataSource)) {
+                            // in order to avoid UI Jank, we add the focus and showing the keyboard
+                            // in the back of the queue
+                            handler.post {
+                                app_drawer_edit_text.requestFocus()
+                                // show the keyboard and set focus to the EditText when swiping down
+                                inputMethodManager.showSoftInput(
+                                    app_drawer_edit_text,
+                                    InputMethodManager.SHOW_IMPLICIT
+                                )
+                            }
                         }
                     }
                 }
@@ -262,6 +279,25 @@ class HomeFragment : BaseFragment(), OnLaunchAppListener {
                 // do nothing
             }
         })
+
+        app_drawer_fragment_list.addOnScrollListener(object: AppDrawerScrollListener() {
+            override fun onScrolledUp() {
+                if (shouldOpenKeyboard(unlauncherDataSource) && !isKeyboardOpen(app_drawer_edit_text)) {
+                    // show the keyboard again when user is scrolling up
+                    inputMethodManager.showSoftInput(
+                        app_drawer_edit_text,
+                        InputMethodManager.SHOW_IMPLICIT
+                    )
+                }
+            }
+
+            override fun onScrolledDown() {
+                if (shouldOpenKeyboard(unlauncherDataSource) && isKeyboardOpen(app_drawer_edit_text)) {
+                    // hide the keyboard again when scrolling down
+                    inputMethodManager.hideSoftInputFromWindow(requireView().windowToken, 0)
+                }
+            }
+        })
     }
 
     fun updateClock() {

app/src/main/java/com/sduduzog/slimlauncher/utils/AppDrawerScrollListener.kt

@@ -0,0 +1,30 @@
+package com.sduduzog.slimlauncher.utils
+
+import androidx.recyclerview.widget.RecyclerView
+
+abstract class AppDrawerScrollListener : RecyclerView.OnScrollListener() {
+
+    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
+        if (recyclerView.scrollState == RecyclerView.SCROLL_STATE_DRAGGING) {
+            if (dy > 0) {
+                // finger moves upwards
+                onScrolledDown()
+            } else if (dy < 0) {
+                // finger moves downwards
+                onScrolledUp()
+            }
+        }
+    }
+
+    /**
+     * Called when user is scrolling upward the [RecyclerView]
+     */
+    abstract fun onScrolledUp()
+
+    /**
+     * * Called when user is scrolling downward the [RecyclerView]
+     */
+    abstract fun onScrolledDown()
+
+
+}

app/src/main/java/com/sduduzog/slimlauncher/utils/Utils.kt

@@ -11,7 +11,12 @@ import android.text.SpannableStringBuilder
 import android.text.Spanned
 import android.text.style.TextAppearanceSpan
 import android.util.DisplayMetrics
+import android.util.Log
+import android.view.View
 import android.view.WindowInsets
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import com.sduduzog.slimlauncher.datasource.UnlauncherDataSource
 import androidx.annotation.StringRes
 import com.sduduzog.slimlauncher.R
 
@@ -77,6 +82,18 @@ fun getScreenHeight(activity: Activity): Int {
     }
 }
 
+fun shouldOpenKeyboard(unlauncherDataSource: UnlauncherDataSource) : Boolean =
+        unlauncherDataSource.corePreferencesRepo.get().activateKeyboardInDrawer
+
+/**
+ * @return [true] when the keyboard is displayed.
+ * Works for android API [20] and higher
+ */
+fun isKeyboardOpen(view: View) : Boolean {
+    val insets = ViewCompat.getRootWindowInsets(view)
+    return insets?.isVisible(WindowInsetsCompat.Type.ime()) ?: false
+}
+
 fun createTitleAndSubtitleText(context: Context, @StringRes titleRes: Int, @StringRes subtitleRes: Int) : CharSequence
     = createTitleAndSubtitleText(context, context.getString(titleRes), context.getString(subtitleRes))