Add WiFi toggle for Android via WifiManager with root fallback

Expose isWifiEnabled() and setWifiEnabled() to Lua via JNI. setWifiEnabled()
tries WifiManager.setWifiEnabled() first; if blocked (OEM restriction or
Android 10+), falls back to `su -c "svc wifi enable/disable"`.

Requires ACCESS_WIFI_STATE and CHANGE_WIFI_STATE permissions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: backcountrymountains

app/src/main/AndroidManifest.xml

@@ -11,6 +11,8 @@
     <!-- common android permissions -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
         android:maxSdkVersion="29" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"

app/src/main/java/org/koreader/launcher/LuaInterface.kt

@@ -65,7 +65,9 @@ interface LuaInterface {
     fun isWarmthDevice(): Boolean
     fun needsWakelocks(): Boolean
     fun openLink(url: String): Boolean
+    fun isWifiEnabled(): Boolean
     fun openWifiSettings()
+    fun setWifiEnabled(enable: Boolean): Boolean
     fun performHapticFeedback(constant: Int, force: Int)
     fun requestIgnoreBatteryOptimizations(rationale: String, okButton: String, cancelButton: String)
     fun requestWriteSystemSettings(rationale: String, okButton: String, cancelButton: String)

app/src/main/java/org/koreader/launcher/MainActivity.kt

@@ -640,10 +640,18 @@ class MainActivity : NativeActivity(), LuaInterface,
         }
     }
 
+    override fun isWifiEnabled(): Boolean {
+        return wifiEnabled()
+    }
+
     override fun openWifiSettings() {
         openWifi()
     }
 
+    override fun setWifiEnabled(enable: Boolean): Boolean {
+        return setWifiRadio(enable)
+    }
+
     override fun performHapticFeedback(constant: Int, force: Int) {
         val rootView = view ?: window.decorView.findViewById<View>(android.R.id.content)
         hapticFeedback(constant, force > 0, rootView)

app/src/main/java/org/koreader/launcher/extensions/ActivityExtensions.kt

@@ -9,6 +9,7 @@ import android.content.pm.PackageManager
 import android.graphics.Point
 import android.graphics.Rect
 import android.net.ConnectivityManager
+import android.net.wifi.WifiManager
 import android.net.NetworkCapabilities
 import android.os.Build
 import android.os.Environment
@@ -191,6 +192,25 @@ fun Activity.openWifi() {
     startActivityCompat(this, openWifiIntent)
 }
 
+fun Activity.wifiEnabled(): Boolean {
+    val wifi = applicationContext.getSystemService(Context.WIFI_SERVICE) as? WifiManager ?: return false
+    return wifi.isWifiEnabled
+}
+
+@Suppress("DEPRECATION")
+fun Activity.setWifiRadio(enable: Boolean): Boolean {
+    val wifi = applicationContext.getSystemService(Context.WIFI_SERVICE) as? WifiManager ?: return false
+    if (wifi.setWifiEnabled(enable)) return true
+    // WifiManager.setWifiEnabled() is blocked on many devices (restricted by OEM or Android 10+).
+    // Fall back to root shell command.
+    val cmd = if (enable) "svc wifi enable" else "svc wifi disable"
+    return try {
+        Runtime.getRuntime().exec(arrayOf("su", "-c", cmd)).waitFor() == 0
+    } catch (e: Exception) {
+        false
+    }
+}
+
 fun Activity.pruneCacheDir() {
     try {
         getExternalFilesDir(null)?.let {

assets/android.lua

@@ -2478,6 +2478,27 @@ local function run(android_app_state)
         end)
     end
 
+    android.isWifiEnabled = function()
+        return JNI:context(android.app.activity.vm, function(jni)
+            return jni:callBooleanMethod(
+                android.app.activity.clazz,
+                "isWifiEnabled",
+                "()Z"
+            )
+        end)
+    end
+
+    android.setWifiEnabled = function(enable)
+        return JNI:context(android.app.activity.vm, function(jni)
+            return jni:callBooleanMethod(
+                android.app.activity.clazz,
+                "setWifiEnabled",
+                "(Z)Z",
+                ffi.new("bool", enable)
+            )
+        end)
+    end
+
     android.download = function(url, name)
         return JNI:context(android.app.activity.vm, function(jni)
             local uri_string = jni.env[0].NewStringUTF(jni.env, url)