Create a working SearchView for the appslist

- Add a `filter` method to `AppsRecyclerView`
- Add a `SearchView` to layout

app/src/main/java/com/finnmglas/launcher/list/apps/AppsRecyclerAdapter.kt

@@ -13,8 +13,10 @@ import android.widget.PopupMenu
 import android.widget.TextView
 import androidx.recyclerview.widget.RecyclerView
 import com.finnmglas.launcher.*
-import com.finnmglas.launcher.libraries.*
+import com.finnmglas.launcher.libraries.FontAwesome
 import com.finnmglas.launcher.list.intendedChoosePause
+import java.util.*
+import kotlin.collections.ArrayList
 
 /**
  * A [RecyclerView] (efficient scrollable list) containing all apps on the users device.
@@ -30,6 +32,7 @@ class AppsRecyclerAdapter(val activity: Activity,
     RecyclerView.Adapter<AppsRecyclerAdapter.ViewHolder>() {
 
     private val appsList: MutableList<AppInfo>
+    private val appsListDisplayed: MutableList<AppInfo>
 
     inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView),
         View.OnClickListener {
@@ -40,7 +43,7 @@ class AppsRecyclerAdapter(val activity: Activity,
         override fun onClick(v: View) {
             val pos = adapterPosition
             val context: Context = v.context
-            val appPackageName = appsList[pos].packageName.toString()
+            val appPackageName = appsListDisplayed[pos].packageName.toString()
 
             when (intention){
                 "view" -> {
@@ -62,10 +65,10 @@ class AppsRecyclerAdapter(val activity: Activity,
     }
 
     override fun onBindViewHolder(viewHolder: ViewHolder, i: Int) {
-        val appLabel = appsList[i].label.toString()
+        val appLabel = appsListDisplayed[i].label.toString()
-        val appPackageName = appsList[i].packageName.toString()
+        val appPackageName = appsListDisplayed[i].packageName.toString()
-        val appIcon = appsList[i].icon
+        val appIcon = appsListDisplayed[i].icon
-        val isSystemApp = appsList[i].isSystemApp
+        val isSystemApp = appsListDisplayed[i].isSystemApp
 
         viewHolder.textView.text = appLabel
         viewHolder.img.setImageDrawable(appIcon)
@@ -127,7 +130,7 @@ class AppsRecyclerAdapter(val activity: Activity,
         return true
     }
 
-    override fun getItemCount(): Int { return appsList.size }
+    override fun getItemCount(): Int { return appsListDisplayed.size }
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
         val inflater = LayoutInflater.from(parent.context)
@@ -136,8 +139,11 @@ class AppsRecyclerAdapter(val activity: Activity,
     }
 
     init {
-        val pm: PackageManager = activity.packageManager
         appsList = ArrayList()
+        appsListDisplayed = ArrayList()
+
+        val pm: PackageManager = activity.packageManager
+
         val i = Intent(Intent.ACTION_MAIN, null)
         i.addCategory(Intent.CATEGORY_LAUNCHER)
         val allApps = pm.queryIntentActivities(i, 0)
@@ -149,5 +155,23 @@ class AppsRecyclerAdapter(val activity: Activity,
             appsList.add(app)
         }
         appsList.sortBy { it.label.toString() }
+        appsListDisplayed.addAll(appsList)
+    }
+
+    /**
+     * The function [filter] is used to search elements within this [RecyclerView].
+     */
+    fun filter(text: String) {
+        appsListDisplayed.clear()
+        if (text.isEmpty()) {
+            appsListDisplayed.addAll(appsList)
+        } else {
+            for (item in appsList) {
+                if (item.label.toString().toLowerCase(Locale.ROOT).contains(text.toLowerCase(Locale.ROOT))) {
+                    appsListDisplayed.add(item)
+                }
+            }
+        }
+        notifyDataSetChanged()
     }
 }

app/src/main/java/com/finnmglas/launcher/list/apps/ListFragmentApps.kt

@@ -1,17 +1,19 @@
 package com.finnmglas.launcher.list.apps
 
+import android.graphics.Color
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.SearchView
+import android.widget.TextView
 import androidx.fragment.app.Fragment
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.finnmglas.launcher.R
 import com.finnmglas.launcher.UIObject
-import com.finnmglas.launcher.list.intention
-import com.finnmglas.launcher.list.forApp
 import com.finnmglas.launcher.dominantColor
-import com.finnmglas.launcher.getSavedTheme
+import com.finnmglas.launcher.list.forApp
+import com.finnmglas.launcher.list.intention
 import kotlinx.android.synthetic.main.list_apps.*
 
 
@@ -36,17 +38,38 @@ class ListFragmentApps : Fragment(), UIObject {
 
     override fun applyTheme() {
         list_apps_container.setBackgroundColor(dominantColor)
+
+        val id: Int = list_apps_searchview.context.resources
+            .getIdentifier("android:id/search_src_text", null, null)
+        list_apps_searchview.findViewById<TextView>(id).setTextColor(Color.WHITE)
     }
 
     override fun setOnClicks() { }
 
     override fun adjustLayout() {
+
+        val appsRViewAdapter = AppsRecyclerAdapter(activity!!, intention, forApp)
+
         // set up the list / recycler
         list_apps_rview.apply {
             // improve performance (since content changes don't change the layout size)
             setHasFixedSize(true)
             layoutManager = LinearLayoutManager(context)
-            adapter = AppsRecyclerAdapter(activity!!, intention, forApp)
+            adapter = appsRViewAdapter
         }
+
+        list_apps_searchview.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
+
+            override fun onQueryTextSubmit(query: String): Boolean {
+                appsRViewAdapter.filter(query);
+                return false
+            }
+
+            override fun onQueryTextChange(newText: String): Boolean {
+                appsRViewAdapter.filter(newText);
+                return false
+            }
+
+        })
     }
 }

app/src/main/res/layout/list_apps.xml

@@ -2,6 +2,7 @@
 <androidx.constraintlayout.widget.ConstraintLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/list_apps_container"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
@@ -12,6 +13,7 @@
         android:layout_height="0dp"
         android:layout_marginStart="16dp"
         android:layout_marginLeft="16dp"
+        android:layout_marginTop="32dp"
         android:layout_marginEnd="16dp"
         android:layout_marginRight="16dp"
         android:scrollbars="vertical"
@@ -20,4 +22,12 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <SearchView
+        android:id="@+id/list_apps_searchview"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>