add uxl app with button

examples/accelerometer.py

@@ -0,0 +1,100 @@
+from kivy.app import App
+from kivy.clock import Clock
+from kivy.uxl import UxlBuilder
+from threading import Thread
+from collections import deque
+from subprocess import Popen, PIPE
+
+content = '''
+Widget:
+    canvas:
+        Color:
+            rgb: (1, 0, 1)
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+        Rectangle:
+            pos: self.pos
+'''
+
+class AcceleratorApp(App):
+    def build(self):
+        root = UxlBuilder(content=content).root
+        self.queue = deque()
+        self.thread = Thread(target=self.read_accelerometer, args=(self.queue, ))
+        self.thread.daemon = True
+        self.thread.start()
+        Clock.schedule_interval(self.pop_deque, 0)
+        return root
+
+    def pop_deque(self, *largs):
+        print '=========+++++FPS+++++=============', Clock.get_fps()
+        try:
+            while True:
+                axis, value = self.queue.pop()
+                if axis == 'X':
+                    self.root.x = value
+                if axis == 'Y':
+                    self.root.y = value
+        except IndexError:
+            return
+
+    def read_accelerometer(self, q):
+        process = Popen('sudo evtest /dev/input/event7', shell=True,
+                       stdout=PIPE)
+        while True:
+            line = process.stdout.readline()
+            line = line.split(' ')
+            if len(line) != 11:
+                continue
+            if line[0] != 'Event:':
+                continue
+            axis = line[8]
+            value = int(line[10].strip('\n'))
+            q.appendleft((axis[1], value))
+
+
+AcceleratorApp().run()