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pdfview.py
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# Android *only* PDF Viewer for Kivy, *full screen only*.
#
# Swipe left or right to change page in pdf
# Back key or back gesture returns the view to the Kivy layout before PdfView()
# Rotates document if buildozer.spec orientation = all
# Document width fits screen width, vertical scroll added if necessary.
# NOTE: self.resume() must be called on_resume() if orientation = all
#
# Base Class: https://kivy.org/doc/stable/api-kivy.uix.modalview.html
# The contents of this ModalView are Android Views, not Kivy Widgets. Inside
# this ModalView Kivy does not paint the screen or get touch events from the
# screen. Painting and touch handling are done using the Android Java API via
# Pyjnius.
#
# Uses buildozer.spec:
# orientation = landscape, portrait, or all
# Argument:
# filepath : required string, path to pdf file
#
# Issues:
# no pinch/zoom/drag, so 'orientation = all' is a good choice
#
# Source https://github.com/Android-for-Python/PDFview-Example
from kivy.uix.modalview import ModalView
from kivy.clock import Clock
from kivy.core.window import Window
from android.runnable import run_on_ui_thread
from jnius import autoclass, cast, PythonJavaClass, java_method
from os.path import exists
PdfRenderer = autoclass('android.graphics.pdf.PdfRenderer')
ParcelFileDescriptor = autoclass('android.os.ParcelFileDescriptor')
Page = autoclass('android.graphics.pdf.PdfRenderer$Page')
Bitmap = autoclass('android.graphics.Bitmap')
BitmapConfig = autoclass('android.graphics.Bitmap$Config')
ImageView = autoclass('android.widget.ImageView')
ViewGroup = autoclass('android.view.ViewGroup')
ScrollView = autoclass('android.widget.ScrollView')
PythonActivity = autoclass('org.kivy.android.PythonActivity')
LayoutParams = autoclass('android.view.ViewGroup$LayoutParams')
LinearLayout = autoclass('android.widget.LinearLayout')
File = autoclass('java.io.File')
Canvas = autoclass('android.graphics.Canvas')
KeyEvent = autoclass('android.view.KeyEvent')
MotionEvent = autoclass('android.view.MotionEvent')
Gravity = autoclass('android.view.Gravity')
GestureDetector = autoclass('android.view.GestureDetector')
class GestureListener(PythonJavaClass):
__javacontext__ = 'app'
__javainterfaces__ = ['android/view/GestureDetector$OnGestureListener']
def __init__(self, callback):
super().__init__()
self.callback = callback
@java_method('(Landroid/view/MotionEvent;)Z')
def onDown(self,e):
return False
@java_method('(Landroid/view/MotionEvent;)V')
def onShowPress(self,e):
pass
@java_method('(Landroid/view/MotionEvent;)Z')
def onSingleTapUp(self,e):
return False
@java_method('(Landroid/view/MotionEvent;Landroid/view/MotionEvent;FF)Z')
def onScroll(self,e1, e2, distanceX, distanceY):
SWIPE_THRESHOLD = 100
result = False
if self.callback:
if abs(distanceY) > abs(distanceX):
if abs(distanceY) < SWIPE_THRESHOLD:
self.callback('Scroll',distanceY)
result = True
return result
@java_method('(Landroid/view/MotionEvent;)V')
def onLongPress(self,e):
pass
@java_method('(Landroid/view/MotionEvent;Landroid/view/MotionEvent;FF)Z')
def onFling(self, e1, e2, velocityX, velocityY):
SWIPE_THRESHOLD = 100
SWIPE_VELOCITY_THRESHOLD = 100
result = False
diffY = e2.getY() - e1.getY()
diffX = e2.getX() - e1.getX()
if self.callback:
if abs(diffX) > abs(diffY) and\
abs(diffX) > SWIPE_THRESHOLD and\
abs(velocityX) > SWIPE_VELOCITY_THRESHOLD:
if diffX > 0:
self.callback('SwipeRight',0)
else:
self.callback('SwipeLeft',0)
result = True
elif abs(diffY) > abs(diffX) and\
abs(diffY) > SWIPE_THRESHOLD and\
abs(velocityY) > SWIPE_VELOCITY_THRESHOLD:
self.callback('Fling',velocityY)
result = True
return result
class TouchListener(PythonJavaClass):
__javacontext__ = 'app'
__javainterfaces__ = ['android/view/View$OnTouchListener']
def __init__(self, callback):
super().__init__()
self.callback = callback
self.context = PythonActivity.mActivity.getApplicationContext()
self.gesture_listener = GestureListener(self.callback)
self.gesture_detector = GestureDetector(self.context,
self.gesture_listener)
@java_method('(Landroid/view/View;Landroid/view/MotionEvent;)Z')
def onTouch(self, v, event):
# onTouch() returns False when events consumed !!! wrong
# onTouchEvent() returns True when matched
return not self.gesture_detector.onTouchEvent(event)
class KeyListener(PythonJavaClass):
__javacontext__ = 'app'
__javainterfaces__ = ['android/view/View$OnKeyListener']
def __init__(self, on_dismiss):
super().__init__()
self.on_dismiss = on_dismiss
@java_method('(Landroid/view/View;ILandroid/view/KeyEvent;)Z')
def onKey(self, v, key_code, event):
if event.getAction() == KeyEvent.ACTION_DOWN and\
key_code == KeyEvent.KEYCODE_BACK:
self.on_dismiss()
return True
return False
class PdfView(ModalView):
# https://developer.android.com/reference/android/graphics/pdf/PdfRenderer.html
def __init__(self, filepath, **kwargs):
super().__init__(**kwargs)
self.enable_dismiss = True
self.filepath = filepath
self.layout = None
self.imgview = None
self.bitmap = None
self.render = None
self.page = 0
if exists(filepath):
self.open()
else:
print('PdfView: '+filepath+' does not exist.')
self.dismiss()
def on_open(self):
self._build_layout()
self._display_current_page()
self._instantiate()
def on_dismiss(self):
if self.enable_dismiss:
self.enable_dismiss = False
self._destroy_render()
self._destroy_layout()
def on_size(self, instance, size):
self._display_current_page()
def resume(self):
# In case the device is rotated between pause and resume
self._display_current_page()
def _create_render(self):
pfd = ParcelFileDescriptor.open(File(self.filepath),
ParcelFileDescriptor.MODE_READ_ONLY)
self.render = PdfRenderer(pfd)
def _destroy_render(self):
if self.render:
self.render.close()
def _display_current_page(self):
if not self.render:
self._create_render()
tmp = self.bitmap
page = self.render.openPage(self.page)
height = int(Window.width * page.getHeight() / page.getWidth())
bitmap = Bitmap.createBitmap(Window.width, height,
BitmapConfig.ARGB_8888)
mutable = bitmap.copy(BitmapConfig.ARGB_8888,True)
del bitmap
canvas = Canvas(mutable)
canvas.drawARGB(255, 255, 255, 255)
page.render(mutable, None, None, Page.RENDER_MODE_FOR_DISPLAY)
page.close()
self.bitmap = mutable
self._set_image_bitmap()
if tmp:
del tmp
def _touch_action(self,action,param):
if action == 'SwipeRight':
self.page = max(self.page-1,0)
self._display_current_page()
elif action == 'SwipeLeft':
self.page = min(self.page+1,self.render.getPageCount()-1)
self._display_current_page()
elif action == 'Fling':
self._fling(-param)
elif action == 'Scroll':
self._scroll(param)
@run_on_ui_thread
def _build_layout(self):
mActivity = PythonActivity.mActivity
context = mActivity.getApplicationContext()
imgview = ImageView(context)
scrollview = ScrollView(context)
scrollview.addView(imgview)
layout = LinearLayout(mActivity)
layout.setOrientation(LinearLayout.VERTICAL)
layout.setVerticalGravity(Gravity.CENTER_VERTICAL)
layout.addView(scrollview)
self.layout = layout
self.imgview = imgview
self.scrollview = scrollview
@run_on_ui_thread
def _instantiate(self):
mActivity = PythonActivity.mActivity
mActivity.addContentView(self.layout, LayoutParams(-1,-1))
self.key_listener = KeyListener(self.dismiss)
self.touch_listener = TouchListener(self._touch_action)
self.imgview.setOnKeyListener(self.key_listener)
self.scrollview.setOnTouchListener(self.touch_listener)
@run_on_ui_thread
def _destroy_layout(self):
if self.layout:
parent = cast(ViewGroup, self.layout.getParent())
if parent is not None: parent.removeView(self.layout)
@run_on_ui_thread
def _fling(self,velocityY):
if self.scrollview:
self.scrollview.fling(velocityY)
@run_on_ui_thread
def _scroll(self,distanceY):
if self.scrollview:
self.scrollview.smoothScrollBy(0,distanceY)
@run_on_ui_thread
def _set_image_bitmap(self):
if self.imgview:
self.imgview.setImageBitmap(self.bitmap)