android: add quick setting tile support

Fixes tailscale/tailscale#516

Signed-off-by: Elias Naur <mail@eliasnaur.com>

android/src/main/AndroidManifest.xml

@@ -10,7 +10,7 @@
 	<application android:label="Tailscale" android:icon="@mipmap/ic_launcher" android:roundIcon="@mipmap/ic_launcher_round"
 		android:name=".App">
 		<activity android:name="org.gioui.GioActivity"
-			android:label="Tailscale"
+			android:label="@string/app_name"
 			android:theme="@style/Theme.GioApp"
 			android:configChanges="orientation|screenSize|screenLayout|smallestScreenSize|keyboardHidden"
 			android:windowSoftInputMode="adjustResize"
@@ -19,6 +19,9 @@
 				<action android:name="android.intent.action.MAIN" />
 				<category android:name="android.intent.category.LAUNCHER" />
 			</intent-filter>
+			<intent-filter>
+				<action android:name="android.service.quicksettings.action.QS_TILE_PREFERENCES" />
+			</intent-filter>
 		</activity>
 		<service android:name=".IPNService"
 			android:permission="android.permission.BIND_VPN_SERVICE">
@@ -26,6 +29,18 @@
 				<action android:name="android.net.VpnService"/>
 			</intent-filter>
 		</service>
+		<service
+			android:name=".QuickToggleService"
+			android:icon="@drawable/ic_tile"
+			android:label="@string/tile_name"
+			android:permission="android.permission.BIND_QUICK_SETTINGS_TILE">
+		<intent-filter>
+			<action android:name="android.service.quicksettings.action.QS_TILE"/>
+		</intent-filter>
+		<meta-data
+			android:name="android.service.quicksettings.ACTIVE_TILE"
+			android:value="true"/>
+	</service>
 	</application>
 </manifest>
 

android/src/main/java/com/tailscale/ipn/App.java

@@ -83,6 +83,10 @@ public class App extends Application {
 		);
 	}
 
+	void setTileStatus(boolean wantRunning) {
+		QuickToggleService.setStatus(this, wantRunning);
+	}
+
 	String getHostname() {
 		String userConfiguredDeviceName = getUserConfiguredDeviceName();
 		if (!isEmpty(userConfiguredDeviceName)) return userConfiguredDeviceName;

android/src/main/java/com/tailscale/ipn/QuickToggleService.java

@@ -0,0 +1,31 @@
+// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package com.tailscale.ipn;
+
+import android.content.Context;
+import android.content.ComponentName;
+import android.service.quicksettings.Tile;
+import android.service.quicksettings.TileService;
+
+public class QuickToggleService extends TileService {
+	private static boolean active;
+
+	@Override public void onStartListening() {
+		Tile t = getQsTile();
+		t.setState(active ? Tile.STATE_ACTIVE : Tile.STATE_INACTIVE);
+		t.updateTile();
+	}
+
+	@Override public void onClick() {
+		onTileClick();
+	}
+
+	static void setStatus(Context ctx, boolean wantRunning) {
+		active = wantRunning;
+		requestListeningState(ctx, new ComponentName(ctx, QuickToggleService.class));
+	}
+
+	private static native void onTileClick();
+}

android/src/main/res/drawable/ic_tile.xml

@@ -0,0 +1,35 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="60"
+    android:viewportHeight="60">
+  <group>
+    <path
+        android:pathData="M15,30.0002m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#FFFDFA"/>
+    <path
+        android:pathData="M30,30.0002m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#FFFDFA"/>
+    <path
+        android:pathData="M15,45.0002m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#54514D"/>
+    <path
+        android:pathData="M45,45.0002m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#54514D"/>
+    <path
+        android:pathData="M30,45.0002m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#FFFDFA"/>
+    <path
+        android:pathData="M45,30.0002m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#FFFDFA"/>
+    <path
+        android:pathData="M15,15.0002m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#54514D"/>
+    <path
+        android:pathData="M30,14.9999m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#54514D"/>
+    <path
+        android:pathData="M45,14.9999m-5,0a5,5 0,1 1,10 0a5,5 0,1 1,-10 0"
+        android:fillColor="#54514D"/>
+  </group>
+</vector>

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

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Tailscale</string>
+    <string name="tile_name">Tailscale</string>
+</resources>

cmd/tailscale/callbacks.go

@@ -94,3 +94,8 @@ func Java_com_tailscale_ipn_App_onConnectivityChanged(env *C.JNIEnv, cls C.jclas
 	default:
 	}
 }
+
+//export Java_com_tailscale_ipn_QuickToggleService_onTileClick
+func Java_com_tailscale_ipn_QuickToggleService_onTileClick(env *C.JNIEnv, cls C.jclass) {
+	requestBackend(ToggleEvent{})
+}

cmd/tailscale/main.go

@@ -40,7 +40,7 @@ type App struct {
 
 	// backend is the channel for events from the frontend to the
 	// backend.
-	backend chan UIEvent
+	backendEvents chan UIEvent
 
 	// mu protects the following fields.
 	mu sync.Mutex
@@ -83,13 +83,14 @@ type SearchEvent struct {
 	Query string
 }
 
-type ReauthEvent struct{}
+// UIEvent types.
-
+type (
-type WebAuthEvent struct{}
+	ToggleEvent     struct{}
-
+	ReauthEvent     struct{}
-type GoogleAuthEvent struct{}
+	WebAuthEvent    struct{}
-
+	GoogleAuthEvent struct{}
-type LogoutEvent struct{}
+	LogoutEvent     struct{}
+)
 
 // serverOAuthID is the OAuth ID of the tailscale-android server, used
 // by GoogleSignInOptions.Builder.requestIdToken.
@@ -97,13 +98,15 @@ const serverOAuthID = "744055068597-hv4opg0h7vskq1hv37nq3u26t8c15qk0.apps.google
 
 const enabledKey = "ipn_enabled"
 
+// backendEvents receives events from the UI (Activity, Tile etc.) to the backend.
+var backendEvents = make(chan UIEvent)
+
 func main() {
 	a := &App{
 		jvm:       jni.JVMFor(app.JavaVM()),
 		appCtx:    jni.Object(app.AppContext()),
 		updates:   make(chan struct{}, 1),
 		vpnClosed: make(chan struct{}, 1),
-		backend:   make(chan UIEvent),
 	}
 	appDir, err := app.DataDir()
 	if err != nil {
@@ -232,8 +235,11 @@ func (a *App) runBackend() error {
 			if m := state.NetworkMap; m != nil && service != 0 {
 				alarm(a.notifyExpiry(service, m.Expiry))
 			}
-		case e := <-a.backend:
+		case e := <-backendEvents:
 			switch e := e.(type) {
+			case ToggleEvent:
+				prefs.WantRunning = !prefs.WantRunning
+				go b.backend.SetPrefs(prefs)
 			case WebAuthEvent:
 				if !signingIn {
 					go b.backend.StartLoginInteractive()
@@ -388,7 +394,14 @@ func (a *App) notify(state BackendState) {
 func (a *App) setPrefs(prefs *ipn.Prefs) {
 	a.mu.Lock()
 	a.prefs = prefs
+	wantRunning := jni.True
+	if !prefs.WantRunning {
+		wantRunning = jni.False
+	}
 	a.mu.Unlock()
+	if err := a.callVoidMethod(a.appCtx, "setTileStatus", "(Z)V", jni.Value(wantRunning)); err != nil {
+		fatalErr(err)
+	}
 	select {
 	case a.updates <- struct{}{}:
 	default:
@@ -418,7 +431,7 @@ func (a *App) runUI() error {
 	for {
 		select {
 		case <-a.vpnClosed:
-			a.request(ConnectEvent{Enable: false})
+			requestBackend(ConnectEvent{Enable: false})
 		case <-a.updates:
 			a.mu.Lock()
 			oldState := state.backend.State
@@ -563,9 +576,9 @@ func (a *App) updateState(javaPeer jni.Object, state *clientState) {
 	state.Peers = peers
 }
 
-func (a *App) request(e UIEvent) {
+func requestBackend(e UIEvent) {
 	go func() {
-		a.backend <- e
+		backendEvents <- e
 	}()
 }
 
@@ -578,15 +591,15 @@ func (a *App) processUIEvents(w *app.Window, events []UIEvent, peer jni.Object,
 			case loginMethodGoogle:
 				a.googleSignIn(peer)
 			default:
-				a.request(WebAuthEvent{})
+				requestBackend(WebAuthEvent{})
 			}
 		case WebAuthEvent:
 			a.store.WriteString(loginMethodPrefKey, loginMethodWeb)
-			a.request(e)
+			requestBackend(e)
 		case LogoutEvent:
-			a.request(e)
+			requestBackend(e)
 		case ConnectEvent:
-			a.request(e)
+			requestBackend(e)
 		case CopyEvent:
 			w.WriteClipboard(e.Text)
 		case GoogleAuthEvent:

jni/jni.go

@@ -40,9 +40,15 @@ type (
 	MethodID  C.jmethodID
 	String    C.jstring
 	ByteArray C.jbyteArray
+	Boolean   C.jboolean
 	Value     uint64 // All JNI types fit into 64-bits.
 )
 
+const (
+	True  Boolean = C.JNI_TRUE
+	False Boolean = C.JNI_FALSE
+)
+
 func JVMFor(jvmPtr uintptr) JVM {
 	return JVM{
 		jvm: (*C.JavaVM)(unsafe.Pointer(jvmPtr)),