adding an initial implementation of the home screen grid

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

@@ -7,6 +7,7 @@ import android.os.Bundle
 import android.view.*
 import android.view.animation.DecelerateInterpolator
 import android.widget.PopupMenu
+import android.widget.RelativeLayout
 import androidx.core.view.GestureDetectorCompat
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.launcher.BuildConfig
@@ -42,6 +43,11 @@ class MainActivity : SimpleActivity(), FlingListener {
             fragment.y = mScreenHeight.toFloat()
             fragment.beVisible()
         }
+
+        (home_screen_grid.layoutParams as RelativeLayout.LayoutParams).apply {
+            topMargin = statusBarHeight
+            bottomMargin = navigationBarHeight
+        }
     }
 
     override fun onResume() {

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

@@ -1,6 +1,9 @@
 package com.simplemobiletools.launcher.extensions
 
 import android.content.Context
+import android.content.pm.LauncherApps
+import android.graphics.drawable.Drawable
+import android.os.Process
 import com.simplemobiletools.commons.extensions.portrait
 import com.simplemobiletools.launcher.R
 import com.simplemobiletools.launcher.helpers.Config
@@ -14,3 +17,25 @@ fun Context.getColumnCount(): Int {
         resources.getInteger(R.integer.landscape_column_count)
     }
 }
+
+fun Context.getDrawableForPackageName(packageName: String): Drawable? {
+    var drawable: Drawable? = null
+    try {
+        // try getting the properly colored launcher icons
+        val launcher = getSystemService(Context.LAUNCHER_APPS_SERVICE) as LauncherApps
+        val activityList = launcher.getActivityList(packageName, Process.myUserHandle())[0]
+        drawable = activityList.getBadgedIcon(0)
+    } catch (e: Exception) {
+    } catch (e: Error) {
+    }
+
+    if (drawable == null) {
+        drawable = try {
+            packageManager.getApplicationIcon(packageName)
+        } catch (ignored: Exception) {
+            null
+        }
+    }
+
+    return drawable
+}

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

@@ -3,11 +3,8 @@ package com.simplemobiletools.launcher.fragments
 import android.annotation.SuppressLint
 import android.content.Context
 import android.content.Intent
-import android.content.pm.LauncherApps
 import android.content.pm.PackageManager
-import android.graphics.drawable.Drawable
 import android.net.Uri
-import android.os.Process
 import android.provider.Settings
 import android.util.AttributeSet
 import android.view.*
@@ -20,6 +17,7 @@ import com.simplemobiletools.launcher.R
 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.interfaces.AllAppsListener
 import com.simplemobiletools.launcher.models.AppLauncher
 import kotlinx.android.synthetic.main.all_apps_fragment.view.*
@@ -82,24 +80,7 @@ class AllAppsFragment(context: Context, attributeSet: AttributeSet) : MyFragment
                 val componentInfo = info.activityInfo.applicationInfo
                 val label = componentInfo.loadLabel(context.packageManager).toString()
                 val packageName = componentInfo.packageName
-
+                val drawable = context.getDrawableForPackageName(packageName) ?: continue
-                var drawable: Drawable? = null
-                try {
-                    // try getting the properly colored launcher icons
-                    val launcher = context.getSystemService(Context.LAUNCHER_APPS_SERVICE) as LauncherApps
-                    val activityList = launcher.getActivityList(packageName, Process.myUserHandle())[0]
-                    drawable = activityList.getBadgedIcon(0)
-                } catch (e: Exception) {
-                } catch (e: Error) {
-                }
-
-                if (drawable == null) {
-                    drawable = try {
-                        context.packageManager.getApplicationIcon(packageName)
-                    } catch (ignored: Exception) {
-                        continue
-                    }
-                }
 
                 allPackageNames.add(packageName)
                 allApps.add(AppLauncher(0, label, packageName, 0, drawable))

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

@@ -0,0 +1,62 @@
+package com.simplemobiletools.launcher.views
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.telecom.TelecomManager
+import android.util.AttributeSet
+import android.view.View
+import com.simplemobiletools.launcher.R
+import com.simplemobiletools.launcher.extensions.getDrawableForPackageName
+
+class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : View(context, attrs, defStyle) {
+    constructor(context: Context, attrs: AttributeSet) : this(context, attrs, 0)
+
+    private val ROW_COUNT = 6
+    private val COLUMN_COUNT = 6
+
+    private var iconMargin = context.resources.getDimension(R.dimen.icon_side_margin).toInt()
+    private var textPaint: Paint
+    private var defaultDialerPackage = (context.getSystemService(Context.TELECOM_SERVICE) as TelecomManager).defaultDialerPackage
+    private var dialerDrawable = context.getDrawableForPackageName(defaultDialerPackage)
+
+    // let's use a 5x5 grid for now with 1 special row at the bottom, prefilled with default apps
+    private var rowXCoords = ArrayList<Int>(COLUMN_COUNT)
+    private var rowYCoords = ArrayList<Int>(ROW_COUNT)
+    private var rowWidth = 0
+    private var rowHeight = 0
+    private var iconSize = 0
+
+    init {
+        textPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+            color = Color.WHITE
+            textSize = context.resources.getDimension(R.dimen.normal_text_size)
+        }
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+        if (rowXCoords.isEmpty()) {
+            rowWidth = width / (COLUMN_COUNT - 1)
+            rowHeight = height / ROW_COUNT
+            iconSize = rowWidth - 2 * iconMargin
+            for (i in 0 until COLUMN_COUNT - 1) {
+                rowXCoords.add(i, i * rowWidth)
+            }
+
+            for (i in 0 until ROW_COUNT) {
+                rowYCoords.add(i, i * rowHeight)
+            }
+        }
+
+        if (dialerDrawable != null) {
+            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)
+                dialerDrawable!!.draw(canvas)
+            }
+        }
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -4,6 +4,13 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <com.simplemobiletools.launcher.views.HomeScreenGrid
+        android:id="@+id/home_screen_grid"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginStart="@dimen/icon_side_margin"
+        android:layout_marginEnd="@dimen/icon_side_margin" />
+
     <include
         android:id="@+id/all_apps_fragment"
         layout="@layout/all_apps_fragment"

app/src/main/res/values/dimens.xml

@@ -2,4 +2,5 @@
     <dimen name="launcher_icon_size">55dp</dimen>
     <dimen name="long_press_anchor_offset_y">70dp</dimen>
     <dimen name="widget_preview_size">140dp</dimen>
+    <dimen name="icon_side_margin">10dp</dimen>
 </resources>