Add a basic but functional app. Needs improvement.

app/src/main/java/com/finnmglas/launcher/FontAwesome.java

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+package com.finnmglas.launcher;
+
+import android.content.Context;
+import android.graphics.Typeface;
+import android.util.AttributeSet;
+import android.widget.TextView;
+
+public class FontAwesome extends androidx.appcompat.widget.AppCompatTextView {
+
+    public FontAwesome(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init();
+    }
+
+    public FontAwesome(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public FontAwesome(Context context) {
+        super(context);
+        init();
+    }
+
+    private void init() {
+
+        //Font name should not contain "/".
+        Typeface tf = Typeface.createFromAsset(getContext().getAssets(),
+                "fonts/fa-solid-900.ttf");
+        setTypeface(tf);
+    }
+
+}

app/src/main/java/com/finnmglas/launcher/FontAwesomeBrand.java

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+package com.finnmglas.launcher;
+
+import android.content.Context;
+import android.graphics.Typeface;
+import android.util.AttributeSet;
+
+public class FontAwesomeBrand extends androidx.appcompat.widget.AppCompatTextView {
+
+    public FontAwesomeBrand(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init();
+    }
+
+    public FontAwesomeBrand(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public FontAwesomeBrand(Context context) {
+        super(context);
+        init();
+    }
+
+    private void init() {
+
+        //Font name should not contain "/".
+        Typeface tf = Typeface.createFromAsset(getContext().getAssets(),
+                "fonts/fa-brand-400.ttf");
+        setTypeface(tf);
+    }
+
+}

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

@@ -0,0 +1,157 @@
+package com.finnmglas.launcher
+
+import android.annotation.SuppressLint
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.content.pm.ResolveInfo
+import android.os.Bundle
+import android.util.DisplayMetrics
+import android.view.KeyEvent
+import android.view.MotionEvent
+import android.view.View
+import android.view.WindowManager
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.MotionEventCompat
+import kotlinx.android.synthetic.main.activity_main.*
+import java.text.SimpleDateFormat
+import java.util.*
+import kotlin.concurrent.fixedRateTimer
+
+
+class MainActivity : AppCompatActivity() {
+    // get device dimensions
+    val displayMetrics = DisplayMetrics()
+
+    private fun getIntent(packageName: String) : Intent? {
+        val pm = applicationContext.packageManager
+        val intent:Intent? = pm.getLaunchIntentForPackage(packageName)
+        intent?.addCategory(Intent.CATEGORY_LAUNCHER)
+        return intent;
+    }
+
+    private fun launchApp(packageName: String, fallback: String = "") {
+        val intent1 = getIntent(packageName);
+
+        if(intent1!=null){
+            applicationContext.startActivity(intent1)
+            overridePendingTransition(0,0);
+        } else {
+            val intent2 = getIntent(fallback);
+
+            if(intent2!=null){
+                applicationContext.startActivity(intent2)
+                overridePendingTransition(0,0);
+            } else {
+                Toast.makeText(this, "Package '$packageName' not found.", Toast.LENGTH_SHORT).show()
+            }
+        }
+    }
+
+    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") }
+
+    fun launchFinder(v: View){ launchApp("com.samsung.android.app.galaxyfinder") }
+    fun launchMail(v: View){ launchApp("com.samsung.android.email.provider") }
+    fun launchCalendar(v: View){ launchApp("com.google.android.calendar") }
+    fun launchClock(v: View){ launchApp("com.sec.android.app.clockpackage") }
+    fun launchBrowser(v: View){ launchApp("org.mozilla.firefox") }
+
+    // Overrides
+
+    var touchX : Float = 0F
+    var touchY : Float = 0F
+
+    override fun onTouchEvent(event: MotionEvent): Boolean {
+
+        return when (MotionEventCompat.getActionMasked(event)) {
+            MotionEvent.ACTION_DOWN -> {
+                touchX = event.x
+                touchY = event.y
+                true
+            }
+            MotionEvent.ACTION_MOVE -> {
+                true
+            }
+            MotionEvent.ACTION_UP -> {
+                windowManager.defaultDisplay.getMetrics(displayMetrics)
+
+                var width = displayMetrics.widthPixels
+                var height = displayMetrics.heightPixels
+
+                //swipe up
+                if (touchY - event.y > height/3) launchBrowser(container);
+                //swipe down
+                if (touchY - event.y < -height/3) launchFinder(container);
+
+                //swipe left
+                if (touchX - event.x > width/3) launchCalendar(container);
+                //swipe right
+                if (touchX - event.x < -width/3) launchMail(container);
+
+                true
+            }
+            MotionEvent.ACTION_CANCEL -> {
+                true
+            }
+            MotionEvent.ACTION_OUTSIDE -> {
+                true
+            }
+            else -> super.onTouchEvent(event)
+        }
+    }
+
+    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
+        if (keyCode == KeyEvent.KEYCODE_BACK) {
+
+        }
+        else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
+
+        }
+        else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
+            listApps()
+        }
+        return true
+    }
+
+    @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)
+
+
+        val dateFormat = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault())
+        val timeFormat = SimpleDateFormat("HH:mm:ss", Locale.getDefault())
+
+        //dateFormat.timeZone = TimeZone.getTimeZone("GMT")
+        //timeFormat.timeZone = TimeZone.getTimeZone("GMT")
+
+        fixedRateTimer("timer", false, 0L, 1000) {
+            this@MainActivity.runOnUiThread {
+                dateView.text = dateFormat.format(Date())
+                timeView.text = timeFormat.format(Date()) // not " GMT"
+            }
+        }
+
+        setContentView(R.layout.activity_main)
+
+    }
+}