pyjnius and flet

[yasseenalhusammin]

Question

The following code currently works fine on Windows, how can I get it to work on Android using pyjnius and flet?

Code sample

import os
import subprocess
import sys
import cv2
import numpy as np
import time
import threading
from queue import Queue

class BarcodeTester:
    def __init__(self):
        self.setup_environment()
        self.reader = None
        self.barcode_types = None
        self.hints = None
        self.init_zxing()
        self.frame_queue = Queue(maxsize=2)
        self.processing = False
        self.found = False
        self.cap = None  # إضافة مرجع لكاميرا الفيديو

    def setup_environment(self):
        java_home = "C:\\Program Files\\Java\\jdk-21"
        os.environ['JAVA_HOME'] = java_home
        os.environ['PATH'] = f"{java_home}\\bin;{java_home}\\bin\\server;" + os.environ['PATH']

    def check_java(self):
        try:
            subprocess.run(['java', '-version'], stderr=subprocess.PIPE, check=True)
            return True
        except subprocess.CalledProcessError:
            return False

    def init_zxing(self):
        try:
            os.environ['CLASSPATH'] = os.pathsep.join([
                os.path.abspath('zxing-core-3.5.2.jar'),
                os.path.abspath('zxing-javase-3.5.2.jar')
            ])

            from jnius import autoclass

            self.reader = autoclass('com.google.zxing.MultiFormatReader')()
            self.barcode_types = autoclass('com.google.zxing.BarcodeFormat')
            DecodeHintType = autoclass('com.google.zxing.DecodeHintType')

            HashMap = autoclass('java.util.HashMap')
            self.hints = HashMap()

            self.hints.put(DecodeHintType.TRY_HARDER, True)
            self.hints.put(DecodeHintType.ALSO_INVERTED, True)
            self.hints.put(DecodeHintType.PURE_BARCODE, True)

            ArrayList = autoclass('java.util.ArrayList')
            formats_list = ArrayList()
            for fmt in [
                self.barcode_types.CODE_128,
                self.barcode_types.EAN_13,
                self.barcode_types.UPC_A
            ]:
                formats_list.add(fmt)

            self.hints.put(DecodeHintType.POSSIBLE_FORMATS, formats_list)
        except Exception as e:
            raise RuntimeError(f"فشل في تهيئة ZXing: {str(e)}")

    def process_frame(self, frame: np.ndarray):
        if self.processing or self.frame_queue.full() or self.found:
            return

        self.processing = True
        try:
            gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
            clahe = cv2.createCLAHE(clipLimit=2.0, tileGridSize=(8, 8))
            enhanced = clahe.apply(gray)
            processed = cv2.medianBlur(enhanced, 3)

            rotations = [0, cv2.ROTATE_90_CLOCKWISE, cv2.ROTATE_180, cv2.ROTATE_90_COUNTERCLOCKWISE]
            for rotate_code in rotations:
                if self.found:
                    break
                rotated = cv2.rotate(processed, rotate_code) if rotate_code != 0 else processed
                result = self.read_barcode(rotated)
                if result:
                    print(result[0])  # طباعة الباركود فقط
                    self.found = True
                    self.clean_exit()  # الانتقال إلى الإغلاق الفوري
        finally:
            self.processing = False

    def read_barcode(self, image: np.ndarray):
        try:
            from jnius import autoclass

            height, width = image.shape
            BufferedImage = autoclass('java.awt.image.BufferedImage')
            buffered_image = BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY)

            raster = buffered_image.getRaster()
            data = image.flatten().tolist()
            raster.setPixels(0, 0, width, height, data)

            LuminanceSource = autoclass('com.google.zxing.client.j2se.BufferedImageLuminanceSource')
            HybridBinarizer = autoclass('com.google.zxing.common.HybridBinarizer')
            BinaryBitmap = autoclass('com.google.zxing.BinaryBitmap')

            luminance_source = LuminanceSource(buffered_image)
            binary_bitmap = BinaryBitmap(HybridBinarizer(luminance_source))

            result = self.reader.decode(binary_bitmap, self.hints)
            return (result.getText(), str(result.getBarcodeFormat())) if result else None
        except Exception:
            return None

    def video_capture_thread(self, camera_index: int = 0):
        self.cap = cv2.VideoCapture(camera_index, cv2.CAP_DSHOW)  # حفظ المرجع
        self.cap.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
        self.cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)
        self.cap.set(cv2.CAP_PROP_FPS, 30)

        try:
            while not self.found:
                ret, frame = self.cap.read()
                if not ret or self.found:
                    break

                if self.frame_queue.qsize() < 2:
                    self.frame_queue.put(frame.copy())

                if not self.frame_queue.empty() and not self.processing:
                    threading.Thread(target=self.process_frame, args=(self.frame_queue.get(),)).start()
        finally:
            if self.cap.isOpened():
                self.cap.release()

    def clean_exit(self):
        # تنظيف جميع الموارد بشكل متسلسل
        if self.cap and self.cap.isOpened():
            self.cap.release()
        cv2.destroyAllWindows()
        os._exit(0)  # إغلاق فوري لجميع المؤشرات الترابطية

    def process_video_stream(self, camera_index: int = 0, timeout: int = 30):
        display_thread = threading.Thread(target=self.video_capture_thread, args=(camera_index,))
        display_thread.daemon = True
        display_thread.start()

        start_time = time.time()
        try:
            while (time.time() - start_time) < timeout and not self.found:
                if not self.frame_queue.empty():
                    frame = self.frame_queue.get()
                    cv2.imshow('', frame)
                if cv2.waitKey(1) == 27:
                    break
        finally:
            self.clean_exit()

if __name__ == "__main__":
    tester = BarcodeTester()
    if tester.check_java():
        tester.process_video_stream(timeout=60)
    else:
        sys.exit("❌ يرجى تثبيت Java بشكل صحيح")

Error message

There's no error, but I need help modifying the following lines to make the code work on Android:
def setup_environment(self):
java_home = "C:\Program Files\Java\jdk-21"
os.environ['JAVA_HOME'] = java_home
os.environ['PATH'] = f"{java_home}\bin;{java_home}\bin\server;" + os.environ['PATH']

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• I have searched for answers to my question both in the issues and in previous discussions.