adding an initial implementation of launcher displaying

app/src/main/AndroidManifest.xml

@@ -4,6 +4,10 @@
     package="com.simplemobiletools.launcher"
     android:installLocation="auto">
 
+    <uses-permission
+        android:name="android.permission.QUERY_ALL_PACKAGES"
+        tools:ignore="QueryAllPackagesPermission" />
+
     <uses-permission
         android:name="android.permission.USE_FINGERPRINT"
         tools:node="remove" />

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

@@ -1,12 +1,19 @@
 package com.simplemobiletools.launcher.activities
 
+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.os.Bundle
-import com.simplemobiletools.commons.extensions.appLaunched
-import com.simplemobiletools.commons.extensions.hideKeyboard
+import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.models.FAQItem
+import com.simplemobiletools.commons.views.MyGridLayoutManager
 import com.simplemobiletools.launcher.BuildConfig
 import com.simplemobiletools.launcher.R
+import com.simplemobiletools.launcher.adapters.LaunchersAdapter
+import com.simplemobiletools.launcher.models.AppLauncher
 import kotlinx.android.synthetic.main.activity_main.*
 
 class MainActivity : SimpleActivity() {
@@ -15,11 +22,14 @@ class MainActivity : SimpleActivity() {
         setContentView(R.layout.activity_main)
         appLaunched(BuildConfig.APPLICATION_ID)
         setupOptionsMenu()
+        getLaunchers()
     }
 
     override fun onResume() {
         super.onResume()
         setupToolbar(main_toolbar)
+        updateTextColors(main_coordinator)
+        launchers_fastscroller.updateColors(getProperPrimaryColor())
     }
 
     private fun setupOptionsMenu() {
@@ -33,6 +43,62 @@ class MainActivity : SimpleActivity() {
         }
     }
 
+    @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)
+
+        val list = packageManager.queryIntentActivities(intent, PackageManager.PERMISSION_GRANTED)
+        for (info in list) {
+            val componentInfo = info.activityInfo.applicationInfo
+            val label = componentInfo.loadLabel(packageManager).toString()
+            val packageName = componentInfo.packageName
+
+            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, android.os.Process.myUserHandle())[0]
+                drawable = activityList.getBadgedIcon(0)
+            } catch (e: Exception) {
+            } catch (e: Error) {
+            }
+
+            if (drawable == null) {
+                drawable = try {
+                    packageManager.getApplicationIcon(packageName)
+                } catch (ignored: Exception) {
+                    continue
+                }
+            }
+
+            allPackageNames.add(packageName)
+            allApps.add(AppLauncher(0, label, packageName, 0, drawable))
+        }
+
+        val launchers = allApps.distinctBy { it.packageName } as ArrayList<AppLauncher>
+        launchers.sortBy { it.title.toLowerCase() }
+
+        val layoutManager = launchers_grid.layoutManager as MyGridLayoutManager
+        layoutManager.spanCount = if (portrait) {
+            resources.getInteger(R.integer.portrait_column_count)
+        } else {
+            resources.getInteger(R.integer.landscape_column_count)
+        }
+
+        setupAdapter(launchers)
+    }
+
+    private fun setupAdapter(launchers: ArrayList<AppLauncher>) {
+        LaunchersAdapter(this, launchers) {
+
+        }.apply {
+            launchers_grid.adapter = this
+        }
+    }
+
     private fun launchSettings() {
         hideKeyboard()
         startActivity(Intent(applicationContext, SettingsActivity::class.java))

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

@@ -0,0 +1,62 @@
+package com.simplemobiletools.launcher.adapters
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import com.simplemobiletools.commons.extensions.getProperTextColor
+import com.simplemobiletools.commons.extensions.portrait
+import com.simplemobiletools.commons.extensions.realScreenSize
+import com.simplemobiletools.launcher.R
+import com.simplemobiletools.launcher.activities.SimpleActivity
+import com.simplemobiletools.launcher.models.AppLauncher
+import kotlinx.android.synthetic.main.item_launcher_label.view.*
+
+class LaunchersAdapter(
+    val activity: SimpleActivity,
+    val launchers: ArrayList<AppLauncher>,
+    val itemClick: (Any) -> Unit
+) : RecyclerView.Adapter<LaunchersAdapter.ViewHolder>() {
+    private var textColor = activity.getProperTextColor()
+    private var iconPadding = 0
+
+    init {
+        calculateIconWidth()
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_launcher_label, parent, false)
+        return ViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        holder.bindView(launchers[position])
+    }
+
+    override fun getItemCount() = launchers.size
+
+    private fun calculateIconWidth() {
+        val currentColumnCount = if (activity.portrait) {
+            activity.resources.getInteger(R.integer.portrait_column_count)
+        } else {
+            activity.resources.getInteger(R.integer.landscape_column_count)
+        }
+
+        val iconWidth = activity.realScreenSize.x / currentColumnCount
+        iconPadding = (iconWidth * 0.1f).toInt()
+    }
+
+    inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        fun bindView(launcher: AppLauncher): View {
+            itemView.apply {
+                launcher_label.text = launcher.title
+                launcher_label.setTextColor(textColor)
+                launcher_icon.setImageDrawable(launcher.drawable!!)
+                launcher_icon.setPadding(iconPadding, iconPadding, iconPadding, 0)
+                setOnClickListener { itemClick(launcher) }
+            }
+
+            return itemView
+        }
+    }
+}

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

@@ -0,0 +1,38 @@
+package com.simplemobiletools.launcher.models
+
+import android.graphics.drawable.Drawable
+import com.simplemobiletools.commons.helpers.SORT_BY_TITLE
+import com.simplemobiletools.commons.helpers.SORT_DESCENDING
+
+data class AppLauncher(val id: Int, var title: String, val packageName: String, var order: Int, val drawable: Drawable? = null) : Comparable<AppLauncher> {
+    companion object {
+        var sorting = 0
+    }
+
+    override fun equals(other: Any?) = packageName.equals((other as AppLauncher).packageName, true)
+
+    fun getBubbleText() = title
+
+    override fun compareTo(other: AppLauncher): Int {
+        var result = when {
+            sorting and SORT_BY_TITLE != 0 -> title.toLowerCase().compareTo(other.title.toLowerCase())
+            else -> {
+                if (order > 0 && other.order == 0) {
+                    -1
+                } else if (order == 0 && other.order > 0) {
+                    1
+                } else if (order > 0 && other.order > 0) {
+                    order.compareTo(other.order)
+                } else {
+                    title.toLowerCase().compareTo(other.title.toLowerCase())
+                }
+            }
+        }
+
+        if (sorting and SORT_DESCENDING != 0) {
+            result *= -1
+        }
+
+        return result
+    }
+}

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

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/main_coordinator"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
@@ -25,6 +26,49 @@
         android:id="@+id/main_holder"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
+        app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+        <androidx.coordinatorlayout.widget.CoordinatorLayout
+            android:id="@+id/coordinator_layout"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent">
+
+            <RelativeLayout
+                android:id="@+id/launchers_holder"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content">
+
+                <com.simplemobiletools.commons.views.MyTextView
+                    android:id="@+id/no_items_placeholder"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_centerHorizontal="true"
+                    android:alpha="0.8"
+                    android:gravity="center"
+                    android:paddingStart="@dimen/activity_margin"
+                    android:paddingTop="@dimen/activity_margin"
+                    android:paddingEnd="@dimen/activity_margin"
+                    android:text="@string/no_items_found"
+                    android:textSize="@dimen/bigger_text_size"
+                    android:textStyle="italic"
+                    android:visibility="gone"
+                    tools:visibility="visible" />
+
+                <com.qtalk.recyclerviewfastscroller.RecyclerViewFastScroller
+                    android:id="@+id/launchers_fastscroller"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content">
+
+                    <com.simplemobiletools.commons.views.MyRecyclerView
+                        android:id="@+id/launchers_grid"
+                        android:layout_width="match_parent"
+                        android:layout_height="match_parent"
+                        android:clipToPadding="false"
+                        app:layoutManager="com.simplemobiletools.commons.views.MyGridLayoutManager"
+                        app:spanCount="@integer/portrait_column_count" />
+
+                </com.qtalk.recyclerviewfastscroller.RecyclerViewFastScroller>
+            </RelativeLayout>
+        </androidx.coordinatorlayout.widget.CoordinatorLayout>
+    </RelativeLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/launcher_holder"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:background="?attr/selectableItemBackground"
+    android:clickable="true"
+    android:focusable="true"
+    android:paddingStart="@dimen/small_margin"
+    android:paddingTop="@dimen/medium_margin"
+    android:paddingEnd="@dimen/small_margin"
+    android:paddingBottom="@dimen/small_margin">
+
+    <com.simplemobiletools.commons.views.MySquareImageView
+        android:id="@+id/launcher_icon"
+        android:layout_width="match_parent"
+        android:layout_height="@dimen/launcher_icon_size"
+        android:layout_gravity="center_horizontal|bottom" />
+
+    <TextView
+        android:id="@+id/launcher_label"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/launcher_icon"
+        android:ellipsize="end"
+        android:gravity="center_horizontal|top"
+        android:maxLines="2"
+        android:textSize="@dimen/smaller_text_size" />
+
+</RelativeLayout>

app/src/main/res/values-w600dp/integers.xml

@@ -0,0 +1,4 @@
+<resources>
+    <integer name="portrait_column_count">6</integer>
+    <integer name="landscape_column_count">10</integer>
+</resources>

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

@@ -1,3 +1,3 @@
 <resources>
-
-</resources>
+    <dimen name="launcher_icon_size">55dp</dimen>
+</resources>

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

@@ -0,0 +1,4 @@
+<resources>
+    <integer name="portrait_column_count">5</integer>
+    <integer name="landscape_column_count">8</integer>
+</resources>