From 7efe05011fb43839e1cb3e5d8307bb0faf398631 Mon Sep 17 00:00:00 2001
From: Josia Pietsch <git@jrpie.de>
Date: Sun, 3 Nov 2024 19:33:21 +0100
Subject: [PATCH] action: torch

---
 .../de/jrpie/android/launcher/Application.kt  | 10 +-
 .../launcher/actions/LauncherAction.kt        | 26 +++++-
 .../android/launcher/actions/TorchManager.kt  | 91 +++++++++++++++++++
 .../drawable/baseline_flashlight_on_24.xml    | 16 ++++
 app/src/main/res/values/strings.xml           |  3 +
 5 files changed, 144 insertions(+), 2 deletions(-)
 create mode 100644 app/src/main/java/de/jrpie/android/launcher/actions/TorchManager.kt
 create mode 100644 app/src/main/res/drawable/baseline_flashlight_on_24.xml

diff --git a/app/src/main/java/de/jrpie/android/launcher/Application.kt b/app/src/main/java/de/jrpie/android/launcher/Application.kt
index 88a0fb3..0a1c0e8 100644
--- a/app/src/main/java/de/jrpie/android/launcher/Application.kt
+++ b/app/src/main/java/de/jrpie/android/launcher/Application.kt
@@ -1,14 +1,22 @@
 package de.jrpie.android.launcher
 
+import android.os.Build
+import android.os.Build.VERSION_CODES
 import androidx.preference.PreferenceManager
+import de.jrpie.android.launcher.actions.TorchManager
 import de.jrpie.android.launcher.preferences.LauncherPreferences
 
 class Application : android.app.Application() {
+    var torchManager: TorchManager? = null
     override fun onCreate() {
         super.onCreate()
 
+        if (Build.VERSION.SDK_INT >= VERSION_CODES.M) {
+            torchManager = TorchManager(this)
+        }
+
         val preferences = PreferenceManager.getDefaultSharedPreferences(this)
         LauncherPreferences.init(preferences, this.resources)
 
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/de/jrpie/android/launcher/actions/LauncherAction.kt b/app/src/main/java/de/jrpie/android/launcher/actions/LauncherAction.kt
index 562ce44..05f8a13 100644
--- a/app/src/main/java/de/jrpie/android/launcher/actions/LauncherAction.kt
+++ b/app/src/main/java/de/jrpie/android/launcher/actions/LauncherAction.kt
@@ -5,10 +5,15 @@ import android.content.Intent
 import android.content.SharedPreferences.Editor
 import android.graphics.Rect
 import android.graphics.drawable.Drawable
+import android.hardware.camera2.CameraAccessException
+import android.hardware.camera2.CameraCharacteristics
+import android.hardware.camera2.CameraManager
 import android.media.AudioManager
+import android.os.Build
 import android.os.SystemClock
 import android.view.KeyEvent
 import android.widget.Toast
+import de.jrpie.android.launcher.Application
 import de.jrpie.android.launcher.R
 import de.jrpie.android.launcher.apps.AppFilter
 import de.jrpie.android.launcher.apps.AppInfo.Companion.INVALID_USER
@@ -37,7 +42,7 @@ enum class LauncherAction(
         "launcher:chooseFromFavorites",
         R.string.list_other_list_favorites,
         R.drawable.baseline_favorite_24,
-        { context -> openAppsList(context, true)}
+        { context -> openAppsList(context, true) }
     ),
     VOLUME_UP(
         "launcher:volumeUp",
@@ -77,6 +82,12 @@ enum class LauncherAction(
         R.drawable.baseline_lock_24px,
         LauncherDeviceAdmin::lockScreen
     ),
+    TORCH(
+        "launcher:toggleTorch",
+        R.string.list_other_torch,
+        R.drawable.baseline_flashlight_on_24,
+        ::toggleTorch
+    ),
     NOP("launcher:nop", R.string.list_other_nop, R.drawable.baseline_not_interested_24, {});
 
     override fun invoke(context: Context, rect: Rect?): Boolean {
@@ -171,6 +182,19 @@ private fun audioVolumeDown(context: Context) {
 }
 /* End media player actions */
 
+private fun toggleTorch(context: Context) {
+    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
+        Toast.makeText(
+            context,
+            context.getString(R.string.alert_requires_android_m),
+            Toast.LENGTH_LONG
+        ).show()
+        return
+    }
+
+    (context.applicationContext as Application).torchManager?.toggleTorch(context)
+}
+
 private fun expandNotificationsPanel(context: Context) {
     /* https://stackoverflow.com/a/15582509 */
     try {
diff --git a/app/src/main/java/de/jrpie/android/launcher/actions/TorchManager.kt b/app/src/main/java/de/jrpie/android/launcher/actions/TorchManager.kt
new file mode 100644
index 0000000..166373c
--- /dev/null
+++ b/app/src/main/java/de/jrpie/android/launcher/actions/TorchManager.kt
@@ -0,0 +1,91 @@
+package de.jrpie.android.launcher.actions
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.hardware.camera2.CameraAccessException
+import android.hardware.camera2.CameraCharacteristics
+import android.hardware.camera2.CameraManager
+import android.os.Build
+import android.os.Build.VERSION_CODES
+import android.os.Handler
+import android.os.Looper
+import android.widget.Toast
+import androidx.annotation.RequiresApi
+import de.jrpie.android.launcher.R
+
+@RequiresApi(VERSION_CODES.M)
+class TorchManager(context: Context) {
+
+    private val camera = getCameraId(context)
+    private var torchEnabled = false
+
+    private val torchCallback = object : CameraManager.TorchCallback() {
+        override fun onTorchModeChanged(cameraId: String, enabled: Boolean) {
+            synchronized(this@TorchManager) {
+                if (cameraId == camera) {
+                    torchEnabled = enabled
+                }
+            }
+        }
+    }
+
+    init {
+        registerCallback(context)
+    }
+
+    private fun getCameraId(context: Context): String? {
+        val cameraManager =
+            context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
+
+        return cameraManager.cameraIdList.firstOrNull { c ->
+            cameraManager
+                .getCameraCharacteristics(c)
+                .get(CameraCharacteristics.FLASH_INFO_AVAILABLE) ?: false
+        }
+    }
+
+    private fun registerCallback(context: Context) {
+        val cameraManager =
+            context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
+
+        cameraManager.registerTorchCallback(
+            torchCallback,
+            Handler(Looper.getMainLooper())
+        )
+    }
+
+    fun toggleTorch(context: Context) {
+        synchronized(this) {
+            val cameraManager =
+                context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
+
+            if (camera == null) {
+                Toast.makeText(
+                    context,
+                    context.getString(R.string.alert_no_torch_found),
+                    Toast.LENGTH_LONG
+                ).show()
+                return
+            }
+
+            try {
+                if (!torchEnabled && Build.VERSION.SDK_INT >= VERSION_CODES.TIRAMISU) {
+                    cameraManager.turnOnTorchWithStrengthLevel(
+                        camera,
+                        cameraManager.getCameraCharacteristics(camera)
+                            .get(CameraCharacteristics.FLASH_INFO_STRENGTH_MAXIMUM_LEVEL) ?: 1
+                    )
+                } else {
+                    cameraManager.setTorchMode(camera, !torchEnabled)
+                }
+
+            } catch (e: CameraAccessException) {
+                Toast.makeText(
+                    context,
+                    context.getString(R.string.alert_torch_access_exception),
+                    Toast.LENGTH_LONG
+                ).show()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/drawable/baseline_flashlight_on_24.xml b/app/src/main/res/drawable/baseline_flashlight_on_24.xml
new file mode 100644
index 0000000..e1326ae
--- /dev/null
+++ b/app/src/main/res/drawable/baseline_flashlight_on_24.xml
@@ -0,0 +1,16 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <path
+        android:fillColor="?android:textColor"
+        android:pathData="M6,2h12v3h-12z" />
+
+    <path
+        android:fillColor="?android:textColor"
+        android:pathData="M6,7v1l2,3v11h8V11l2,-3V7H6zM12,15.5c-0.83,0 -1.5,-0.67 -1.5,-1.5s0.67,-1.5 1.5,-1.5s1.5,0.67 1.5,1.5S12.83,15.5 12,15.5z" />
+
+</vector>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 17bdff8..637dfd3 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -234,10 +234,13 @@
     <string name="settings">Settings</string>
     <string name="ic_menu_alt">More options</string>
     <string name="alert_cant_expand_status_bar_panel">Error: Can\'t expand status bar.\nThis action is using functionality that is not part of the published Android API. Unfortunately, it does not seem to work on your device.</string>
+    <string name="alert_requires_android_m">This functionality requires Android 6.0 or later.</string>
     <string name="snackbar_app_hidden">App hidden. You can make it visible again in settings.</string>
     <string name="undo">Undo</string>
     <string name="list_other_expand_settings_panel">Quick Settings</string>
     <string name="toast_device_admin_not_enabled">µLauncher needs to be a device admin in order to lock the screen.</string>
     <string name="device_admin_explanation">This is required for the lock screen action.</string>
     <string name="device_admin_description">Enable the lock screen action</string>
+    <string name="alert_no_torch_found">No camera with torch detected.</string>
+    <string name="alert_torch_access_exception">Error: Can\'t access torch.</string>
 </resources>