blank PDF after app returns from background mode.

[tomerlevi444]

When app switches to background mode, PDFView.onDetachedFromWindow might be called which causes the pdf to recycle and clear all of its contents.
Then, when app returns to foreground, the pdf appears blank.

This happens when pdf is located inside a Dialog, for example.

[vahidarr]

It happens for me too

[vahidarr]

this work in Activity but not work in Dialog.this is dialog Code:

public class PdfViewerModal extends Dialog {
    public PdfViewerModal(@NonNull Context context) {
        super(context);
        View mainView = LayoutInflater.from(context).inflate(R.layout.modal_pdf_viewer, null);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        addContentView(mainView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));

        PDFView pdfView = mainView.findViewById(R.id.pdfView);

        pdfView.fromAsset("asan.pdf").load();
    }
}