call jnius.detach on thread stop

lib/daemon.py

@@ -220,6 +220,7 @@ class Daemon(DaemonThread):
             self.print_error("shutting down network")
             self.network.stop()
             self.network.join()
+        self.on_stop()
 
     def stop(self):
         self.print_error("stopping, removing lockfile")

lib/network.py

@@ -814,7 +814,7 @@ class Network(util.DaemonThread):
             self.process_pending_sends()
 
         self.stop_network()
-        self.print_error("stopped")
+        self.on_stop()
 
     def on_header(self, i, header):
         height = header.get('block_height')

lib/plugins.py

@@ -169,7 +169,7 @@ class Plugins(DaemonThread):
         while self.is_running():
             time.sleep(0.1)
             self.run_jobs()
-        self.print_error("stopped")
+        self.on_stop()
 
 
 hook_names = set()

lib/util.py

@@ -149,6 +149,12 @@ class DaemonThread(threading.Thread, PrintError):
         with self.running_lock:
             self.running = False
 
+    def on_stop(self):
+        if 'ANDROID_DATA' in os.environ:
+            import jnius
+            jnius.detach()
+            self.print_error("jnius detach")
+        self.print_error("stopped")
 
 
 is_verbose = False