Allow enabling Wi-Fi for Wi-Fi direct

mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt

@@ -10,6 +10,7 @@ import android.net.wifi.p2p.*
 import android.os.Build
 import android.os.Handler
 import android.os.Looper
+import android.provider.Settings
 import androidx.annotation.RequiresApi
 import androidx.annotation.StringRes
 import androidx.core.content.edit
@@ -287,7 +288,8 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
     private fun doStart() {
         val listener = object : WifiP2pManager.ActionListener {
             override fun onFailure(reason: Int) {
-                startFailure(formatReason(R.string.repeater_create_group_failure, reason))
+                startFailure(formatReason(R.string.repeater_create_group_failure, reason),
+                        showWifiEnable = reason == WifiP2pManager.BUSY)
             }
             override fun onSuccess() { }    // wait for WIFI_P2P_CONNECTION_CHANGED_ACTION to fire to go to step 3
         }
@@ -368,8 +370,13 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
         status = Status.ACTIVE
         showNotification(group)
     }
-    private fun startFailure(msg: CharSequence, group: WifiP2pGroup? = null) {
+    private fun startFailure(msg: CharSequence, group: WifiP2pGroup? = null, showWifiEnable: Boolean = false) {
-        SmartSnackbar.make(msg).show()
+        SmartSnackbar.make(msg).apply {
+            if (showWifiEnable) action(R.string.repeater_p2p_unavailable_enable) {
+                if (Build.VERSION.SDK_INT >= 29) it.context.startActivity(Intent(Settings.Panel.ACTION_WIFI))
+                else @Suppress("DEPRECATION") app.wifi.isWifiEnabled = true
+            }
+        }.show()
         showNotification()
         if (group != null) removeGroup() else cleanLocked()
     }

mobile/src/main/java/be/mygod/vpnhotspot/widget/SmartSnackbar.kt

@@ -46,11 +46,16 @@ sealed class SmartSnackbar {
     }
 
     abstract fun show()
+    open fun action(@StringRes id: Int, listener: (View) -> Unit) { }
     open fun shortToast() = this
 }
 
 private class SnackbarWrapper(private val snackbar: Snackbar) : SmartSnackbar() {
     override fun show() = snackbar.show()
+
+    override fun action(@StringRes id: Int, listener: (View) -> Unit) {
+        snackbar.setAction(id, listener)
+    }
 }
 
 private class ToastWrapper(private val toast: Toast) : SmartSnackbar() {

mobile/src/main/res/values-zh-rCN/strings.xml

@@ -17,6 +17,7 @@
     <string name="repeater_clean_pog_failure">删除多余 P2P 群组失败（原因：%s）</string>
 
     <string name="repeater_p2p_unavailable">Wi\u2011Fi 直连不可用，请打开 Wi\u2011Fi</string>
+    <string name="repeater_p2p_unavailable_enable">打开</string>
     <string name="repeater_create_group_failure">创建 P2P 群组失败（原因：%s）</string>
     <string name="repeater_remove_group_failure">关闭已有 P2P 群组失败（原因：%s）</string>
     <string name="repeater_remove_old_group_failure">关闭 P2P 群组失败（原因：%s）</string>

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

@@ -26,6 +26,7 @@
     <string name="repeater_clean_pog_failure">Failed to remove redundant P2P group (reason: %s)</string>
 
     <string name="repeater_p2p_unavailable">Wi\u2011Fi direct unavailable, please enable Wi\u2011Fi</string>
+    <string name="repeater_p2p_unavailable_enable">Enable</string>
     <string name="repeater_create_group_failure">Failed to create P2P group (reason: %s)</string>
     <string name="repeater_remove_group_failure">Failed to remove P2P group (reason: %s)</string>
     <string name="repeater_remove_old_group_failure">Failed to remove old P2P group (reason: %s)</string>