use LiveData to store app list

app/src/main/java/de/jrpie/android/launcher/Application.kt

@@ -1,14 +1,69 @@
 package de.jrpie.android.launcher
 
 import android.content.SharedPreferences
+import android.content.pm.LauncherApps
+import android.content.pm.ShortcutInfo
+import android.os.AsyncTask
 import android.os.Build
 import android.os.Build.VERSION_CODES
+import android.os.UserHandle
+import androidx.lifecycle.MutableLiveData
 import androidx.preference.PreferenceManager
 import de.jrpie.android.launcher.actions.TorchManager
 import de.jrpie.android.launcher.apps.AppInfo
+import de.jrpie.android.launcher.apps.DetailedAppInfo
 import de.jrpie.android.launcher.preferences.LauncherPreferences
 
 class Application : android.app.Application() {
+    val apps = MutableLiveData<List<DetailedAppInfo>>()
+
+    // TODO: only update specific apps
+    private val launcherAppsCallback = object : LauncherApps.Callback() {
+        override fun onPackageRemoved(p0: String?, p1: UserHandle?) {
+            loadApps()
+        }
+
+        override fun onPackageAdded(p0: String?, p1: UserHandle?) {
+            loadApps()
+        }
+
+        override fun onPackageChanged(p0: String?, p1: UserHandle?) {
+            loadApps()
+        }
+
+        override fun onPackagesAvailable(p0: Array<out String>?, p1: UserHandle?, p2: Boolean) {
+            // TODO
+        }
+
+        override fun onPackagesSuspended(packageNames: Array<out String>?, user: UserHandle?) {
+            // TODO
+        }
+
+        override fun onPackagesUnsuspended(packageNames: Array<out String>?, user: UserHandle?) {
+            // TODO
+        }
+
+        override fun onPackagesUnavailable(p0: Array<out String>?, p1: UserHandle?, p2: Boolean) {
+            // TODO
+        }
+
+        override fun onPackageLoadingProgressChanged(
+            packageName: String,
+            user: UserHandle,
+            progress: Float
+        ) {
+            // TODO
+        }
+
+        override fun onShortcutsChanged(
+            packageName: String,
+            shortcuts: MutableList<ShortcutInfo>,
+            user: UserHandle
+        ) {
+            // TODO
+        }
+    }
+
     var torchManager: TorchManager? = null
     private var customAppNames: HashMap<AppInfo, String>? = null
     private val listener = SharedPreferences.OnSharedPreferenceChangeListener { _, pref ->
@@ -32,10 +87,20 @@ class Application : android.app.Application() {
 
         LauncherPreferences.getSharedPreferences()
             .registerOnSharedPreferenceChangeListener(listener)
+
+
+        val launcherApps = getSystemService(LAUNCHER_APPS_SERVICE) as LauncherApps
+        launcherApps.registerCallback(launcherAppsCallback)
+
+        loadApps()
     }
 
     fun getCustomAppNames(): HashMap<AppInfo, String> {
         return (customAppNames ?: LauncherPreferences.apps().customNames() ?: HashMap())
             .also { customAppNames = it }
     }
+
+    private fun loadApps() {
+        AsyncTask.execute { apps.postValue(getApps(packageManager, applicationContext)) }
+    }
 }

app/src/main/java/de/jrpie/android/launcher/Functions.kt

@@ -18,13 +18,9 @@ import de.jrpie.android.launcher.actions.Action
 import de.jrpie.android.launcher.actions.Gesture
 import de.jrpie.android.launcher.apps.AppInfo
 import de.jrpie.android.launcher.apps.DetailedAppInfo
-import de.jrpie.android.launcher.ui.list.apps.AppsRecyclerAdapter
 import de.jrpie.android.launcher.ui.tutorial.TutorialActivity
 
 
-/* Objects used by multiple activities */
-val appsList: MutableList<DetailedAppInfo> = ArrayList()
-
 /* REQUEST CODES */
 
 const val REQUEST_CHOOSE_APP = 1
@@ -84,10 +80,10 @@ fun openTutorial(context: Context) {
 
 
 /**
- * [loadApps] is used to speed up the [AppsRecyclerAdapter] loading time,
- * as it caches all the apps and allows for fast access to the data.
+ * Load all apps.
  */
-fun loadApps(packageManager: PackageManager, context: Context) {
+fun getApps(packageManager: PackageManager, context: Context): MutableList<DetailedAppInfo> {
+    val start = System.currentTimeMillis()
     val loadList = mutableListOf<DetailedAppInfo>()
 
     val launcherApps = context.getSystemService(Service.LAUNCHER_APPS_SERVICE) as LauncherApps
@@ -101,7 +97,6 @@ fun loadApps(packageManager: PackageManager, context: Context) {
         }
     }
 
-
     // fallback option
     if (loadList.isEmpty()) {
         Log.w(LOG_TAG, "using fallback option to load packages")
@@ -119,8 +114,11 @@ fun loadApps(packageManager: PackageManager, context: Context) {
         }
     }
     loadList.sortBy { it.getCustomLabel(context).toString() }
-    appsList.clear()
-    appsList.addAll(loadList)
+
+    val end = System.currentTimeMillis()
+    Log.i(LOG_TAG, "${loadList.size} apps loaded (${end - start}ms)")
+
+    return loadList
 }
 
 

app/src/main/java/de/jrpie/android/launcher/ui/HomeActivity.kt

@@ -20,7 +20,6 @@ import de.jrpie.android.launcher.actions.Action
 import de.jrpie.android.launcher.actions.Gesture
 import de.jrpie.android.launcher.actions.LauncherAction
 import de.jrpie.android.launcher.databinding.HomeBinding
-import de.jrpie.android.launcher.loadApps
 import de.jrpie.android.launcher.openTutorial
 import de.jrpie.android.launcher.preferences.LauncherPreferences
 import de.jrpie.android.launcher.preferences.migratePreferencesToNewVersion
@@ -88,9 +87,6 @@ class HomeActivity : UIObject, AppCompatActivity(),
             openTutorial(this)
         }
 
-        // Preload apps to speed up the Apps Recycler
-        AsyncTask.execute { loadApps(packageManager, applicationContext) }
-
         // Initialise layout
         binding = HomeBinding.inflate(layoutInflater)
         setContentView(binding.root)

app/src/main/java/de/jrpie/android/launcher/ui/list/apps/AppsRecyclerAdapter.kt

@@ -4,7 +4,6 @@ import android.annotation.SuppressLint
 import android.app.Activity
 import android.content.Intent
 import android.graphics.Rect
-import android.os.AsyncTask
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -12,16 +11,16 @@ import android.view.inputmethod.InputMethodManager
 import android.widget.ImageView
 import android.widget.PopupMenu
 import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.RecyclerView
+import de.jrpie.android.launcher.Application
 import de.jrpie.android.launcher.R
 import de.jrpie.android.launcher.REQUEST_CHOOSE_APP
 import de.jrpie.android.launcher.actions.AppAction
 import de.jrpie.android.launcher.apps.AppFilter
 import de.jrpie.android.launcher.apps.AppInfo
 import de.jrpie.android.launcher.apps.DetailedAppInfo
-import de.jrpie.android.launcher.appsList
 import de.jrpie.android.launcher.getUserFromId
-import de.jrpie.android.launcher.loadApps
 import de.jrpie.android.launcher.preferences.LauncherPreferences
 import de.jrpie.android.launcher.preferences.ListLayout
 import de.jrpie.android.launcher.ui.list.ListActivity
@@ -47,8 +46,16 @@ class AppsRecyclerAdapter(
 ) :
     RecyclerView.Adapter<AppsRecyclerAdapter.ViewHolder>() {
 
+    private val apps = (activity.applicationContext as Application).apps
     private val appsListDisplayed: MutableList<DetailedAppInfo> = mutableListOf()
 
+    init {
+        apps.observe(this.activity as AppCompatActivity) {
+            updateAppsList()
+        }
+        updateAppsList()
+    }
+
 
     inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView),
         View.OnClickListener {
@@ -171,18 +178,6 @@ class AppsRecyclerAdapter(
         return viewHolder
     }
 
-    init {
-        // Load the apps
-        if (appsList.size == 0)
-            loadApps(activity.packageManager, activity)
-        else {
-            AsyncTask.execute { loadApps(activity.packageManager, activity) }
-            notifyDataSetChanged()
-        }
-        updateAppsList()
-
-    }
-
     fun selectItem(pos: Int, rect: Rect = Rect()) {
         if (pos >= appsListDisplayed.size) {
             return
@@ -205,7 +200,7 @@ class AppsRecyclerAdapter(
 
     fun updateAppsList(triggerAutoLaunch: Boolean = false) {
         appsListDisplayed.clear()
-        appsListDisplayed.addAll(appFilter(appsList))
+        apps.value?.let { appsListDisplayed.addAll(appFilter(it)) }
 
         if (triggerAutoLaunch &&
             appsListDisplayed.size == 1