cache launchers in a db

app/src/main/kotlin/com/simplemobiletools/launcher/adapters/LaunchersAdapter.kt

@@ -1,5 +1,6 @@
 package com.simplemobiletools.launcher.adapters
 
+import android.graphics.drawable.ColorDrawable
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -59,8 +60,12 @@ class LaunchersAdapter(
             itemView.apply {
                 launcher_label.text = launcher.title
                 launcher_label.setTextColor(textColor)
-                launcher_icon.setImageDrawable(launcher.drawable!!)
                 launcher_icon.setPadding(iconPadding, iconPadding, iconPadding, 0)
+
+                if (launcher.drawable != null) {
+                    launcher_icon.setImageDrawable(launcher.drawable!!)
+                }
+
                 setOnClickListener { itemClick(launcher) }
                 setOnLongClickListener { view ->
                     allAppsListener.onIconLongPressed(view.x, view.y, launcher.packageName)

app/src/main/kotlin/com/simplemobiletools/launcher/databases/AppsDatabase.kt

@@ -4,11 +4,14 @@ import android.content.Context
 import androidx.room.Database
 import androidx.room.Room
 import androidx.room.RoomDatabase
+import com.simplemobiletools.launcher.interfaces.AppLaunchersDao
 import com.simplemobiletools.launcher.models.AppLauncher
 
 @Database(entities = [AppLauncher::class], version = 1)
 abstract class AppsDatabase : RoomDatabase() {
 
+    abstract fun AppLaunchersDao(): AppLaunchersDao
+
     companion object {
         private var db: AppsDatabase? = null
 

app/src/main/kotlin/com/simplemobiletools/launcher/extensions/Context.kt

@@ -6,10 +6,14 @@ import android.graphics.drawable.Drawable
 import android.os.Process
 import com.simplemobiletools.commons.extensions.portrait
 import com.simplemobiletools.launcher.R
+import com.simplemobiletools.launcher.databases.AppsDatabase
 import com.simplemobiletools.launcher.helpers.Config
+import com.simplemobiletools.launcher.interfaces.AppLaunchersDao
 
 val Context.config: Config get() = Config.newInstance(applicationContext)
 
+val Context.launchersDB: AppLaunchersDao get() = AppsDatabase.getInstance(applicationContext).AppLaunchersDao()
+
 fun Context.getColumnCount(): Int {
     return if (portrait) {
         resources.getInteger(R.integer.portrait_column_count)

app/src/main/kotlin/com/simplemobiletools/launcher/fragments/AllAppsFragment.kt

@@ -22,6 +22,7 @@ import com.simplemobiletools.launcher.adapters.LaunchersAdapter
 import com.simplemobiletools.launcher.extensions.getColumnCount
 import com.simplemobiletools.launcher.extensions.getDrawableForPackageName
 import com.simplemobiletools.launcher.extensions.launchApp
+import com.simplemobiletools.launcher.extensions.launchersDB
 import com.simplemobiletools.launcher.interfaces.AllAppsListener
 import com.simplemobiletools.launcher.models.AppLauncher
 import kotlinx.android.synthetic.main.all_apps_fragment.view.*
@@ -73,12 +74,15 @@ class AllAppsFragment(context: Context, attributeSet: AttributeSet) : MyFragment
 
     @SuppressLint("WrongConstant")
     private fun getLaunchers() {
-        val allApps = ArrayList<AppLauncher>()
-        val allPackageNames = ArrayList<String>()
-        val intent = Intent(Intent.ACTION_MAIN, null)
-        intent.addCategory(Intent.CATEGORY_LAUNCHER)
-
         ensureBackgroundThread {
+            val cachedLaunchers = context.launchersDB.getAppLaunchers() as ArrayList<AppLauncher>
+            gotLaunchers(cachedLaunchers)
+
+            val allApps = ArrayList<AppLauncher>()
+            val allPackageNames = ArrayList<String>()
+            val intent = Intent(Intent.ACTION_MAIN, null)
+            intent.addCategory(Intent.CATEGORY_LAUNCHER)
+
             val list = context.packageManager.queryIntentActivities(intent, PackageManager.PERMISSION_GRANTED)
             for (info in list) {
                 val componentInfo = info.activityInfo.applicationInfo
@@ -88,20 +92,25 @@ class AllAppsFragment(context: Context, attributeSet: AttributeSet) : MyFragment
                 val placeholderColor = calculateAverageColor(drawable.toBitmap())
 
                 allPackageNames.add(packageName)
-                allApps.add(AppLauncher(0, label, packageName, 0, placeholderColor, drawable))
+                allApps.add(AppLauncher(null, label, packageName, 0, placeholderColor, drawable))
             }
 
             val launchers = allApps.distinctBy { it.packageName } as ArrayList<AppLauncher>
-            launchers.sortBy { it.title.normalizeString().lowercase() }
-
-            val layoutManager = all_apps_grid.layoutManager as MyGridLayoutManager
-            layoutManager.spanCount = context.getColumnCount()
-            setupAdapter(launchers)
+            context.launchersDB.insertAll(launchers)
+            gotLaunchers(launchers)
         }
     }
 
+    private fun gotLaunchers(appLaunchers: ArrayList<AppLauncher>) {
+        val sorted = appLaunchers.sortedBy { it.title.normalizeString().lowercase() }.toList() as ArrayList<AppLauncher>
+        setupAdapter(sorted)
+    }
+
     private fun setupAdapter(launchers: ArrayList<AppLauncher>) {
         activity?.runOnUiThread {
+            val layoutManager = all_apps_grid.layoutManager as MyGridLayoutManager
+            layoutManager.spanCount = context.getColumnCount()
+
             LaunchersAdapter(activity!!, launchers, all_apps_fastscroller, this) {
                 activity?.launchApp((it as AppLauncher).packageName)
             }.apply {

app/src/main/kotlin/com/simplemobiletools/launcher/interfaces/AppLaunchersDao.kt

@@ -0,0 +1,16 @@
+package com.simplemobiletools.launcher.interfaces
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import com.simplemobiletools.launcher.models.AppLauncher
+
+@Dao
+interface AppLaunchersDao {
+    @Query("SELECT * FROM apps")
+    fun getAppLaunchers(): List<AppLauncher>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    fun insertAll(appLaunchers: List<AppLauncher>)
+}