feature: set launcher as home screen

app/src/main/AndroidManifest.xml

@@ -8,6 +8,11 @@
         tools:ignore="QueryAllPackagesPermission" />
 
 
+    <queries>
+        <intent>
+            <category android:name="android.intent.category.HOME"/>
+        </intent>
+    </queries>
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
@@ -40,6 +45,7 @@
             android:screenOrientation="portrait"
             tools:ignore="LockedOrientationActivity">
         </activity>
+
     </application>
 
 </manifest>

app/src/main/java/de/jrpie/android/launcher/Functions.kt

@@ -2,10 +2,12 @@ package de.jrpie.android.launcher
 
 import android.app.Activity
 import android.app.AlertDialog
+import android.content.ComponentName
 import android.content.Context
 import android.content.Intent
 import android.content.SharedPreferences
 import android.content.pm.PackageManager
+import android.content.pm.ResolveInfo
 import android.graphics.BlendMode
 import android.graphics.BlendModeColorFilter
 import android.graphics.ColorMatrix
@@ -19,6 +21,7 @@ import android.os.Bundle
 import android.os.SystemClock
 import android.provider.Settings
 import android.util.DisplayMetrics
+import android.util.Log
 import android.view.KeyEvent
 import android.view.View
 import android.view.Window
@@ -101,6 +104,20 @@ fun getPreferences(context: Context): SharedPreferences{
     )
 }
 
+fun setDefaultHomeScreen(context: Context, checkDefault: Boolean = false) {
+    if(checkDefault) {
+        val testIntent = Intent(Intent.ACTION_MAIN)
+        testIntent.addCategory(Intent.CATEGORY_HOME)
+        val defaultHome = testIntent.resolveActivity(context.packageManager)?.packageName
+        if(defaultHome == context.packageName){
+            // Launcher is already the default home app
+            return
+        }
+    }
+    val intent = Intent(Settings.ACTION_HOME_SETTINGS)
+    context.startActivity(intent)
+}
+
 /* Activity related */
 
 fun isInstalled(uri: String, context: Context): Boolean {

app/src/main/java/de/jrpie/android/launcher/list/apps/ListFragmentApps.kt

@@ -7,9 +7,8 @@ import android.view.ViewGroup
 import androidx.fragment.app.Fragment
 import androidx.recyclerview.widget.LinearLayoutManager
 import de.jrpie.android.launcher.PREF_SEARCH_AUTO_KEYBOARD
-import de.jrpie.android.launcher.R
-import de.jrpie.android.launcher.databinding.ListAppsBinding
 import de.jrpie.android.launcher.UIObject
+import de.jrpie.android.launcher.databinding.ListAppsBinding
 import de.jrpie.android.launcher.getPreferences
 import de.jrpie.android.launcher.list.ListActivity
 import de.jrpie.android.launcher.list.forGesture

app/src/main/java/de/jrpie/android/launcher/settings/launcher/SettingsFragmentLauncher.kt

@@ -31,6 +31,7 @@ import de.jrpie.android.launcher.setWindowFlags
 import de.jrpie.android.launcher.settings.intendedSettingsPause
 import de.jrpie.android.launcher.vibrantColor
 import de.jrpie.android.launcher.databinding.SettingsLauncherBinding
+import de.jrpie.android.launcher.setDefaultHomeScreen
 
 
 /**
@@ -57,6 +58,7 @@ class SettingsFragmentLauncher : Fragment(), UIObject {
 
     override fun applyTheme() {
 
+        setButtonColor(binding.settingsLauncherButtonChooseHomescreen, vibrantColor)
         setSwitchColor(binding.settingsLauncherSwitchScreenTimeout, vibrantColor)
         setSwitchColor(binding.settingsLauncherSwitchScreenFull, vibrantColor)
         setSwitchColor(binding.settingsLauncherSwitchAutoLaunch, vibrantColor)
@@ -83,6 +85,10 @@ class SettingsFragmentLauncher : Fragment(), UIObject {
             }
         }
 
+        binding.settingsLauncherButtonChooseHomescreen.setOnClickListener {
+            setDefaultHomeScreen(requireContext(), checkDefault = false)
+        }
+
         binding.settingsLauncherButtonChooseWallpaper.setOnClickListener {
             // https://github.com/LineageOS/android_packages_apps_Trebuchet/blob/6caab89b21b2b91f0a439e1fd8c4510dcb255819/src/com/android/launcher3/views/OptionsPopupView.java#L271
             val intent = Intent(Intent.ACTION_SET_WALLPAPER)

app/src/main/java/de/jrpie/android/launcher/tutorial/tabs/TutorialFragmentFinish.kt

@@ -54,6 +54,8 @@ class TutorialFragmentFinish : Fragment(), UIObject {
                     .apply()
             }
         }
+        context?.let { setDefaultHomeScreen(it, checkDefault = true) }
+
         activity?.finish()
     }
 }

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

@@ -16,6 +16,21 @@
     android:paddingRight="32sp"
     tools:context=".settings.meta.SettingsFragmentMeta">
 
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16sp"
+        android:orientation="horizontal">
+
+        <Button
+            android:id="@+id/settings_launcher_button_choose_homescreen"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/settings_launcher_choose_homescreen"
+            android:textAllCaps="false" />
+    </LinearLayout>
+
+
     <LinearLayout
         android:id="@+id/settings_launcher_section_appearance"
         android:layout_width="match_parent"

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

@@ -102,6 +102,8 @@
     <string name="settings_launcher_choose_wallpaper">Choose a wallpaper</string>
     <string name="settings_launcher_change_wallpaper">Change wallpaper</string>
 
+    <string name="settings_launcher_choose_homescreen">Set μLauncher as home screen</string>
+
     <string name="settings_launcher_section_display">Display</string>
 
     <string name="settings_launcher_disable_timeout">Keep screen on</string>