Vibrate on widget touch

Fixes #443

README.md

@@ -191,6 +191,7 @@ Permissions
 * RECEIVE_BOOT_COMPLETED ('*Run at startup*'): to start the firewall when booting the device
 * WAKE_LOCK ('*Prevent device from sleeping*'): to reliably reload rules in the background on connectivity changes
 * READ/WRITE_EXTERNAL_STORAGE ('*Photos/Media/Files*'): to export/import settings on Android versions before 5.0 (Lollipop) (there is no need to grant this permission on later Android versions)
+* VIBRATE: to give feedback on widget tap
 * com.android.vending.BILLING: to use in-app billing
 
 Support

app/src/main/AndroidManifest.xml

@@ -10,6 +10,7 @@
     <uses-permission android:name="com.android.vending.BILLING" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.VIBRATE" />
     <!-- http://developer.android.com/guide/topics/security/permissions.html#normal-dangerous -->
 
     <uses-feature

app/src/main/java/eu/faircode/netguard/Widget.java

@@ -29,6 +29,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.VpnService;
 import android.os.Build;
+import android.os.Vibrator;
 import android.preference.PreferenceManager;
 import android.util.Log;
 import android.widget.RemoteViews;
@@ -60,6 +61,11 @@ public class Widget extends AppWidgetProvider {
         PendingIntent pi = PendingIntent.getBroadcast(context, 0, new Intent(INTENT_ON), PendingIntent.FLAG_UPDATE_CURRENT);
         am.cancel(pi);
 
+        // Vibrate
+        Vibrator vs = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
+        if (vs.hasVibrator())
+            vs.vibrate(50);
+
         if (INTENT_OFF.equals(intent.getAction())) {
             prefs.edit().putBoolean("enabled", false).apply();
             ServiceSinkhole.stop("widget", context);