launch the clicked app on clicking its icon

app/src/main/kotlin/com/simplemobiletools/launcher/activities/MainActivity.kt

@@ -12,6 +12,7 @@ import androidx.core.view.GestureDetectorCompat
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.launcher.BuildConfig
 import com.simplemobiletools.launcher.R
+import com.simplemobiletools.launcher.extensions.launchApp
 import com.simplemobiletools.launcher.fragments.AllAppsFragment
 import com.simplemobiletools.launcher.fragments.MyFragment
 import com.simplemobiletools.launcher.fragments.WidgetsFragment
@@ -152,7 +153,9 @@ class MainActivity : SimpleActivity(), FlingListener {
 
     fun homeScreenClicked(x: Float, y: Float) {
         if (x >= home_screen_grid.left && x <= home_screen_grid.right && y >= home_screen_grid.top && y <= home_screen_grid.bottom) {
-            home_screen_grid.gridClicked(x, y)
+            home_screen_grid.gridClicked(x, y) { packageName ->
+                launchApp(packageName)
+            }
         }
     }
 
@@ -161,9 +164,9 @@ class MainActivity : SimpleActivity(), FlingListener {
     }
 
     private class MyGestureListener(private val flingListener: FlingListener) : GestureDetector.SimpleOnGestureListener() {
-        override fun onSingleTapConfirmed(event: MotionEvent): Boolean {
+        override fun onSingleTapUp(event: MotionEvent): Boolean {
             (flingListener as MainActivity).homeScreenClicked(event.x, event.y)
-            return super.onSingleTapConfirmed(event)
+            return super.onSingleTapUp(event)
         }
 
         override fun onFling(event1: MotionEvent, event2: MotionEvent, velocityX: Float, velocityY: Float): Boolean {

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

@@ -0,0 +1,13 @@
+package com.simplemobiletools.launcher.extensions
+
+import android.app.Activity
+import com.simplemobiletools.commons.extensions.showErrorToast
+
+fun Activity.launchApp(packageName: String) {
+    val launchIntent = packageManager.getLaunchIntentForPackage(packageName)
+    try {
+        startActivity(launchIntent)
+    } catch (e: Exception) {
+        showErrorToast(e)
+    }
+}

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

@@ -18,6 +18,7 @@ import com.simplemobiletools.launcher.activities.MainActivity
 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.interfaces.AllAppsListener
 import com.simplemobiletools.launcher.models.AppLauncher
 import kotlinx.android.synthetic.main.all_apps_fragment.view.*
@@ -98,12 +99,7 @@ class AllAppsFragment(context: Context, attributeSet: AttributeSet) : MyFragment
     private fun setupAdapter(launchers: ArrayList<AppLauncher>) {
         activity?.runOnUiThread {
             LaunchersAdapter(activity!!, launchers, all_apps_fastscroller, this) {
-                val launchIntent = context.packageManager.getLaunchIntentForPackage((it as AppLauncher).packageName)
+                activity?.launchApp((it as AppLauncher).packageName)
-                try {
-                    activity!!.startActivity(launchIntent)
-                } catch (e: Exception) {
-                    activity?.showErrorToast(e)
-                }
             }.apply {
                 all_apps_grid.adapter = this
             }

app/src/main/kotlin/com/simplemobiletools/launcher/models/HomeScreenGridItem.kt

@@ -0,0 +1,5 @@
+package com.simplemobiletools.launcher.models
+
+import android.graphics.Rect
+
+data class HomeScreenGridItem(var rect: Rect, val packageName: String)

app/src/main/kotlin/com/simplemobiletools/launcher/views/HomeScreenGrid.kt

@@ -1,14 +1,17 @@
 package com.simplemobiletools.launcher.views
 
+import android.annotation.SuppressLint
 import android.content.Context
 import android.graphics.Canvas
 import android.graphics.Color
 import android.graphics.Paint
+import android.graphics.Rect
 import android.telecom.TelecomManager
 import android.util.AttributeSet
 import android.view.View
 import com.simplemobiletools.launcher.R
 import com.simplemobiletools.launcher.extensions.getDrawableForPackageName
+import com.simplemobiletools.launcher.models.HomeScreenGridItem
 
 class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : View(context, attrs, defStyle) {
     constructor(context: Context, attrs: AttributeSet) : this(context, attrs, 0)
@@ -27,6 +30,7 @@ class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : Vie
     private var rowWidth = 0
     private var rowHeight = 0
     private var iconSize = 0
+    private var gridItems = arrayListOf<HomeScreenGridItem>()
 
     init {
         textPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
@@ -35,6 +39,7 @@ class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : Vie
         }
     }
 
+    @SuppressLint("DrawAllocation")
     override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
         if (rowXCoords.isEmpty()) {
@@ -54,13 +59,24 @@ class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : Vie
             for (i in 0 until COLUMN_COUNT - 1) {
                 val drawableX = rowXCoords[i] + iconMargin
                 val drawableY = rowYCoords[COLUMN_COUNT - 1] + rowHeight - iconSize - iconMargin * 2
-                dialerDrawable!!.setBounds(drawableX, drawableY, drawableX + iconSize, drawableY + iconSize)
+                val rect = Rect(drawableX, drawableY, drawableX + rowWidth, drawableY + rowHeight)
+
+                dialerDrawable!!.setBounds(rect.left, rect.top, drawableX + iconSize, drawableY + iconSize)
                 dialerDrawable!!.draw(canvas)
+
+                val gridItem = HomeScreenGridItem(rect, defaultDialerPackage)
+                gridItems.add(gridItem)
             }
         }
     }
 
-    fun gridClicked(x: Float, y: Float) {
+    fun gridClicked(x: Float, y: Float, callback: (packageName: String) -> Unit) {
-
+        for (gridItem in gridItems) {
+            val rect = gridItem.rect
+            if (x >= rect.left && x <= rect.right && y >= rect.top && y <= rect.bottom) {
+                callback(gridItem.packageName)
+                break
+            }
+        }
     }
 }