Add a new activity_choose activity

app/src/main/java/com/finnmglas/launcher/ChooseActivity.kt

@@ -0,0 +1,66 @@
+package com.finnmglas.launcher
+
+import android.annotation.SuppressLint
+import android.content.Intent
+import android.content.pm.ApplicationInfo
+import android.graphics.Color
+import android.os.Bundle
+import android.view.WindowManager
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import kotlinx.android.synthetic.main.activity_choose.*
+
+
+class ChooseActivity : AppCompatActivity() {
+
+    private fun listApps() {
+        val mainIntent = Intent(Intent.ACTION_MAIN, null)
+        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER)
+
+        val pm = packageManager
+        val apps = pm.getInstalledApplications(0)
+
+        val installedApps: MutableList<ApplicationInfo> = ArrayList()
+
+        // list
+        for (app in apps) {
+
+            if (app.flags and ApplicationInfo.FLAG_UPDATED_SYSTEM_APP != 0) {
+                //checks for flags; if flagged, check if updated system app
+                installedApps.add(app);
+            } else if (app.flags and ApplicationInfo.FLAG_SYSTEM != 0) {
+                //it's a system app, not interested
+            } else {
+                //in this case, it should be a user-installed app
+                installedApps.add(app)
+            }
+        }
+
+        // ui
+        for (app in installedApps) {
+            //packageInfo.sourceDir
+            pm.getLaunchIntentForPackage(app.packageName)
+
+            // creating TextView programmatically
+            val tvdynamic = TextView(this)
+            tvdynamic.textSize = 20f
+            tvdynamic.text = app.loadLabel(pm).toString()
+            tvdynamic.setTextColor(Color.parseColor("#cccccc"));
+
+            tvdynamic.setOnClickListener { startActivity(pm.getLaunchIntentForPackage(app.packageName)) }
+
+            apps_list.addView(tvdynamic)
+        }
+    }
+
+    @SuppressLint("SetTextI18n") // I do not care
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
+        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+
+        setContentView(R.layout.activity_choose)
+        listApps()
+    }
+}

app/src/main/java/com/finnmglas/launcher/MainActivity.kt

@@ -10,6 +10,7 @@ import android.view.KeyEvent
 import android.view.MotionEvent
 import android.view.View
 import android.view.WindowManager
+import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.MotionEventCompat
@@ -48,22 +49,6 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
-    private fun listApps() {
-        val mainIntent = Intent(Intent.ACTION_MAIN, null)
-        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER)
-
-        val pm = packageManager
-        val packages =
-            pm.getInstalledApplications(PackageManager.GET_META_DATA)
-
-        for (packageInfo in packages) {
-            //packageInfo.packageName
-            //packageInfo.sourceDir
-            pm.getLaunchIntentForPackage(packageInfo.packageName)
-            startActivity(pm.getLaunchIntentForPackage(packageInfo.packageName))
-        }
-    }
-
     fun launchInstagram(v: View){ launchApp("com.instagram.android") }
     fun launchWhatsapp(v: View){ launchApp("com.whatsapp") }
 
@@ -125,7 +110,8 @@ class MainActivity : AppCompatActivity() {
 
         }
         else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
-            //listApps() // crashes
+            val intent = Intent(this, ChooseActivity::class.java);
+            startActivity(intent)
         }
         return true
     }