ghost
commented
6 years ago I made a minimal reproduction case.
- Write this into your
main.pyfile:#!/usr/bin/env python3
def apply_hack(): import ctypes.util orig_func = ctypes.util.find_library def android_find_library_hack(*args): import os name = args[0]
# Truncate ending for easier comparison:
if name.find(".so.") >= 0:
name = name.partition(".so.")[0]
if name.endswith(".so"):
name = name[:-len(".so")]
if not name.endswith("."):
name += "."
# Helper function to check lib name:
def check_name(lib_name, search_name):
if filename.endswith('.so') and (
filename.startswith("lib" + search_name) or
filename.startswith(search_name)):
return True
if search_name.endswith("-2.0."): # PySDL2 hack
search_name = search_name[:-len("-2.0.")] + "."
return check_name(lib_name, search_name)
return False
# Check the user app lib dir and system dir:
app_root = os.path.normpath(os.path.abspath(os.path.join(
os.path.dirname(__file__), '..', '..', 'lib')))
sys_dir = "/system/lib"
for lib_search in [app_root, sys_dir]:
if not os.path.exists(lib_search):
continue
for filename in os.listdir(lib_search):
if check_name(filename, name):
return os.path.join(lib_search, filename)
return orig_func(*args)
import ctypes.util
ctypes.util.find_library = android_find_library_hackapply_hack()
import ctypes import sdl2 as sdl import sys import time import traceback
window = None renderer = None
def test_app(): global window, renderer print("Creating window (app launch)...") sdl.SDL_Init(sdl.SDL_INIT_EVERYTHING) window = sdl.SDL_CreateWindow( "This is a test.".encode("utf-8", "replace"), sdl.SDL_WINDOWPOS_CENTERED, sdl.SDL_WINDOWPOS_CENTERED, 640, 480, sdl.SDL_WINDOW_SHOWN | sdl.SDL_WINDOW_RESIZABLE) renderer = sdl.SDL_CreateRenderer(window, -1, 0)
# Main event loop:
while True:
time.sleep(0.01)
# Fetch events:
events = []
while True:
ev = sdl.SDL_Event()
result = sdl.SDL_PollEvent(ctypes.byref(ev))
if result == 1:
events.append(ev)
continue
break
for event in events:
handle_event(event)def handle_event(event): global window, renderer
if event.type == sdl.SDL_QUIT or \
event.type == sdl.SDL_APP_TERMINATING:
print("Terminating (app termination event).")
if renderer != None:
sdl.SDL_DestroyRenderer(renderer)
renderer = None
if window != None:
sdl.SDL_DestroyWindow(window)
window = None
sys.exit(0)
elif event.type == sdl.SDL_WINDOWEVENT:
if event.window.event == \
sdl.SDL_WINDOWEVENT_CLOSE:
# Throw away renderer:
if renderer != None:
sdl.SDL_DestroyRenderer(renderer)
renderer = None
print("Renderer destroyed (window closed).")
# Close window:
if window != None:
sdl.SDL_DestroyWindow(window)
window = None
print("Window destroyed (window closed).")
# Terminate if not on android:
if sdl.SDL_GetPlatform().decode("utf-8").\
lower() != "android":
print("Terminating app since on desktop OS, " +
"and last window was closed.")
sys.exit(0)
if (event.window.event ==
sdl.SDL_WINDOWEVENT_RESTORED or
event.window.event ==
sdl.SDL_WINDOWEVENT_EXPOSED or
event.window.event ==
sdl.SDL_WINDOWEVENT_MAXIMIZED):
# Re-create renderer if necessary:
if renderer == None:
print("Renderer re-created (got window focus).")
renderer = sdl.SDL_CreateRenderer(window, -1, 0)
elif (event.type == sdl.SDL_APP_DIDENTERBACKGROUND):
print("Entered background.")
# Wipe renderer:
if renderer != None:
sdl.SDL_DestroyRenderer(renderer)
renderer = None
print("Renderer destroyed (entered background).")
elif (event.type == sdl.SDL_APP_WILLENTERFOREGROUND):
print("Entering foreground.")
# Re-create window if necessary:
if window == None:
window = sdl.SDL_CreateWindow(
"This is a test.".encode("utf-8", "replace"),
sdl.SDL_WINDOWPOS_CENTERED, sdl.SDL_WINDOWPOS_CENTERED,
640, 480, sdl.SDL_WINDOW_SHOWN |
sdl.SDL_WINDOW_RESIZABLE)
if renderer != None:
sdl.SDL_DestroyRenderer(renderer)
renderer = None
print("Renderer destroyed (new window).")
# Re-create renderer if necessary:
if renderer == None:
renderer = sdl.SDL_CreateRenderer(window, -1, 0)
print("Renderer re-created (entering foreground).")test_app()
2. Compile with `p4a apk --debug --private /path/to/folder/with/main.py/in/it/ --orientation user --window --package=org.example.myapp --name "My application" --version 0.1 --bootstrap=sdl2 --requirements=python3crystax,sdl2,pysdl2,pyjnius --arch=armeabi-v7a` (or equivalent command line)
3. Install the `.apk` on your phone
4. Open app, wait a bit to make sure extraction is complete (check `extracting` messages in logcat) - the loading screen won't ever go away because the app never redraws or does anything useful
5. Press home button to leave app
6. Return to app -> instant crash
This app works perfectly fine on the desktop, and I don't see why it shouldn't on Android - so I suggest with the reproduction case as a starting point, it would be worth investigating why `python-for-android` crashes with this.
inclement
KeyWeeUsr
I am using python-for-android & PySDL2 (no kivy) and I am running into an unavoidable crash when pressing the home button and leaving the app, and then returning to it.
I tried a couple of strategies:
If I destroy the SDL_Window & SDL_Renderer when I get the background event (
SDL_APP_DIDENTERBACKGROUND), the app crashes right away (SIGSEGV in SDL2) before it's even fully in the background.If I destroy the SDL_Renderer (
SDL_DestroyRenderer) but keep the window around, as soon as the app gains focus again, it crashes (SIGSEGV IN SDL2) - this is before I get to process any single event in my code after the resumption, so it's not like I've been drawing or accessing anything. It seems to be a problem in the wrapper during the resume process.If I keep window & renderer both around, it similarly crashes on resume. (That one isn't too surprising, since I imagine the renderer probably needs to be re-created - I just tested it for completeness)
So first of all, what am I even supposed to do? And since I'm pretty sure it's one of those 3 things, it seems the wrapper is simply broken.