ui: add shortcut for adding quick settings tile

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/QuickTileService.kt

@@ -75,6 +75,7 @@ class QuickTileService : TileService() {
     }
 
     override fun onCreate() {
+        isAdded = true
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
             iconOn = Icon.createWithResource(this, R.drawable.ic_tile)
             iconOff = iconOn
@@ -98,6 +99,11 @@ class QuickTileService : TileService() {
         iconOff = Icon.createWithBitmap(b)
     }
 
+    override fun onDestroy() {
+        super.onDestroy()
+        isAdded = false
+    }
+
     override fun onStartListening() {
         Application.getTunnelManager().addOnPropertyChangedCallback(onTunnelChangedCallback)
         if (tunnel != null) tunnel!!.addOnPropertyChangedCallback(onStateChangedCallback)
@@ -109,6 +115,14 @@ class QuickTileService : TileService() {
         Application.getTunnelManager().removeOnPropertyChangedCallback(onTunnelChangedCallback)
     }
 
+    override fun onTileAdded() {
+        isAdded = true
+    }
+
+    override fun onTileRemoved() {
+        isAdded = false
+    }
+
     private fun updateTile() {
         // Update the tunnel.
         val newTunnel = Application.getTunnelManager().lastUsedTunnel
@@ -157,5 +171,7 @@ class QuickTileService : TileService() {
 
     companion object {
         private const val TAG = "WireGuard/QuickTileService"
+        var isAdded: Boolean = false
+            private set
     }
 }

ui/src/main/java/com/wireguard/android/activity/SettingsActivity.kt

@@ -4,9 +4,11 @@
  */
 package com.wireguard.android.activity
 
+import android.content.ComponentName
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
+import android.service.quicksettings.TileService
 import android.view.MenuItem
 import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.commit
@@ -14,6 +16,7 @@ import androidx.lifecycle.lifecycleScope
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import com.wireguard.android.Application
+import com.wireguard.android.QuickTileService
 import com.wireguard.android.R
 import com.wireguard.android.backend.WgQuickBackend
 import com.wireguard.android.preference.PreferencesPreferenceDataStore
@@ -47,7 +50,13 @@ class SettingsActivity : AppCompatActivity() {
         override fun onCreatePreferences(savedInstanceState: Bundle?, key: String?) {
             preferenceManager.preferenceDataStore = PreferencesPreferenceDataStore(lifecycleScope, Application.getPreferencesDataStore())
             addPreferencesFromResource(R.xml.preferences)
-            preferenceScreen.initialExpandedChildrenCount = 4
+            preferenceScreen.initialExpandedChildrenCount = 5
+
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU || QuickTileService.isAdded) {
+                val quickTile = preferenceManager.findPreference<Preference>("quick_tile")
+                quickTile?.parent?.removePreference(quickTile)
+                --preferenceScreen.initialExpandedChildrenCount
+            }
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                 val darkTheme = preferenceManager.findPreference<Preference>("dark_theme")
                 darkTheme?.parent?.removePreference(darkTheme)

ui/src/main/java/com/wireguard/android/preference/QuickTilePreference.kt

@@ -0,0 +1,50 @@
+/*
+ * Copyright © 2017-2023 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.wireguard.android.preference
+
+import android.app.StatusBarManager
+import android.content.ComponentName
+import android.content.Context
+import android.graphics.drawable.Icon
+import android.os.Build
+import android.util.AttributeSet
+import android.widget.Toast
+import androidx.annotation.RequiresApi
+import androidx.preference.Preference
+import com.wireguard.android.QuickTileService
+import com.wireguard.android.R
+
+@RequiresApi(Build.VERSION_CODES.TIRAMISU)
+class QuickTilePreference(context: Context, attrs: AttributeSet?) : Preference(context, attrs) {
+    override fun getSummary() = context.getString(R.string.quick_settings_tile_add_summary)
+
+    override fun getTitle() = context.getString(R.string.quick_settings_tile_add_title)
+
+    override fun onClick() {
+        val statusBarManager = context.getSystemService(StatusBarManager::class.java)
+        statusBarManager.requestAddTileService(
+            ComponentName(context, QuickTileService::class.java),
+            context.getString(R.string.quick_settings_tile_action),
+            Icon.createWithResource(context, R.drawable.ic_tile),
+            context.mainExecutor
+        ) {
+            when (it) {
+                StatusBarManager.TILE_ADD_REQUEST_RESULT_TILE_ALREADY_ADDED,
+                StatusBarManager.TILE_ADD_REQUEST_RESULT_TILE_ADDED -> {
+                    parent?.removePreference(this)
+                    --preferenceManager.preferenceScreen.initialExpandedChildrenCount
+                }
+                StatusBarManager.TILE_ADD_REQUEST_ERROR_MISMATCHED_PACKAGE,
+                StatusBarManager.TILE_ADD_REQUEST_ERROR_REQUEST_IN_PROGRESS,
+                StatusBarManager.TILE_ADD_REQUEST_ERROR_BAD_COMPONENT,
+                StatusBarManager.TILE_ADD_REQUEST_ERROR_NOT_CURRENT_USER,
+                StatusBarManager.TILE_ADD_REQUEST_ERROR_APP_NOT_IN_FOREGROUND,
+                StatusBarManager.TILE_ADD_REQUEST_ERROR_NO_STATUS_BAR_SERVICE ->
+                    Toast.makeText(context, context.getString(R.string.quick_settings_tile_add_failure, it), Toast.LENGTH_SHORT).show()
+            }
+        }
+    }
+}

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

@@ -185,6 +185,10 @@
     <string name="private_key">Private key</string>
     <string name="public_key">Public key</string>
     <string name="qr_code_hint">Tip: generate with `qrencode -t ansiutf8 &lt; tunnel.conf`.</string>
+    <string name="quick_settings_tile_add_title">Add tile to quick settings panel</string>
+    <string name="quick_settings_tile_add_summary">The shortcut tile toggles the most recent tunnel</string>
+    <string name="quick_settings_tile_add_failure">Unable to add shortcut tile: error %d</string>
+    <string name="quick_settings_tile_action">Toggle tunnel</string>
     <string name="restore_on_boot_summary_off">Will not bring up enabled tunnels at boot</string>
     <string name="restore_on_boot_summary_on">Will bring up enabled tunnels at boot</string>
     <string name="restore_on_boot_title">Restore on boot</string>

ui/src/main/res/xml/preferences.xml

@@ -12,6 +12,7 @@
         android:summaryOn="@string/restore_on_boot_summary_on"
         android:title="@string/restore_on_boot_title" />
     <com.wireguard.android.preference.ZipExporterPreference android:key="zip_exporter" />
+    <com.wireguard.android.preference.QuickTilePreference android:key="quick_tile" />
     <Preference
         android:key="log_viewer"
         android:singleLineTitle="false"