'Is poppler installed and in PATH' - Running pdf2Image script in android

Question

I have a custom python script using pdf2Image which I am trying to run on an android phone. I have tried these two ways

1. Use an android app that can run python scripts on android.
2. Create an android app and integrate my python code (using chaquopy).

But in both the cases, I am getting

W/System.err: com.chaquo.python.PyException: PDFInfoNotInstalledError: Unable to get page count. Is poppler installed and in PATH?

My scripts are running seamlessly on ubuntu terminal (using python <scriptFileName.py>) but when I try to do it on android, it is giving me the above issue

My trouble is that I am not able to understand how can I install poppler, or add it to PATH in android.

Following is my script that converts the PDF into JPEG images (Module name = pdf2Img.py):

from pdf2image import convert_from_bytes
import sys
import os
import shutil
import io

def extractImagesFromPdf(fileContents):

    BASE_DIR = 'in_pdfs'
    EXTENSION = '.pdf'
    OUT_DIR = 'images'
    IMG_EXT = '.jpg'
    sep = "/"

    if not os.path.exists(getDirectoryPath(BASE_DIR)):
        os.mkdir(getDirectoryPath(BASE_DIR))

    pages = convert_from_bytes(fileContents)

    if os.path.exists(getDirectoryPath(OUT_DIR)):
        shutil.rmtree(getDirectoryPath(OUT_DIR))
        os.mkdir(getDirectoryPath(OUT_DIR))

    page_num = 1
    for page in pages:
        page.save(getDirectoryPath(OUT_DIR) + sep + str(page_num) + IMG_EXT, 'JPEG')
        page_num = page_num + 1

def getDirectoryPath(dir):
    base_path = os.path.dirname(__file__)
    return base_path + "/" + dir

This is how I am invoking it

public class MainActivity extends AppCompatActivity {

    private static final int PICK_PDF_FILE = 2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void selectAndUploadFile(View view) {
        Intent intent= new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("application/pdf");

        startActivityForResult(intent, PICK_PDF_FILE);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
        super.onActivityResult(requestCode, resultCode, resultData);
        if (requestCode == PICK_PDF_FILE
                && resultCode == Activity.RESULT_OK) {
            Uri inPDF = null;
            if (resultData != null) {
                inPDF = resultData.getData();
                Log.i("SelectAndUpload", "onActivityResult: " + inPDF);

                if (!Python.isStarted()) {
                    Python.start(new AndroidPlatform(MainActivity.this));
                }

                Python py = Python.getInstance();
                PyObject module = py.getModule("pdf2Img");

                try {
                    InputStream iStream =   getContentResolver().openInputStream(inPDF);
                    byte[] inputData = getBytes(iStream);
                    PyObject result = module.callAttr("extractImagesFromPDF", inputData);

                } catch (Exception e) {
                    Log.i("Ex", "Exception!!!");
                    e.printStackTrace();
                    Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
                }

            }
        }
    }

    public byte[] getBytes(InputStream inputStream) throws IOException {
        ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
        int bufferSize = 1024;
        byte[] buffer = new byte[bufferSize];

        int len = 0;
        while ((len = inputStream.read(buffer)) != -1) {
            byteBuffer.write(buffer, 0, len);
        }
        return byteBuffer.toByteArray();
    }
}

And the error is coming at line

    pages = convert_from_path(BASE_DIR + sep + fileName + EXTENSION)

Few references:

1. Chaquopy getting started documentation
2. Converting uri to byte[]
3. pdf2Image (python library) reference documentation