android/app/src/main/java/uprrp/tania/fragments/ConsentFragment.java

package uprrp.tania.fragments;

import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Environment;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

import com.github.barteksc.pdfviewer.PDFView;
import com.github.barteksc.pdfviewer.listener.OnDrawListener;
import com.github.barteksc.pdfviewer.listener.OnPageChangeListener;
import com.github.barteksc.pdfviewer.listener.OnPageErrorListener;
import com.github.barteksc.pdfviewer.listener.OnRenderListener;
import com.github.barteksc.pdfviewer.listener.OnTapListener;


import java.io.File;

import uprrp.tania.R;

public class ConsentFragment extends Fragment {

    private static final String TAG = "ConsentFragment";
    private PDFView pdfView;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_consent, container, false);

        this.pdfView = view.findViewById(R.id.pdf_viewer);
        File consentFile = new File(Environment.getExternalStorageDirectory().getPath() + getString(R.string.consentFileName));
        this.pdfView.fromFile(consentFile)
                .password(null)
                .defaultPage(0)
                .enableSwipe(true)
                .swipeHorizontal(false)
                .enableDoubletap(true)
                .onDraw(new OnDrawListener() {
                    @Override
                    public void onLayerDrawn(Canvas canvas, float pageWidth, float pageHeight, int displayedPage) {
                        //Code here if you want to do something
                    }
                })
                .onDrawAll(new OnDrawListener() {
                    @Override
                    public void onLayerDrawn(Canvas canvas, float pageWidth, float pageHeight, int displayedPage) {
                        //Code here if you want to do something
                    }
                })
                .onPageError(new OnPageErrorListener() {
                    @Override
                    public void onPageError(int page, Throwable t) {
                        Toast.makeText(getContext(), "Error opening page " + page, Toast.LENGTH_LONG).show();
                    }
                })
                .onPageChange(new OnPageChangeListener() {
                    @Override
                    public void onPageChanged(int page, int pageCount) {
                        //Code here
                    }
                })
                .onTap(new OnTapListener() {
                    @Override
                    public boolean onTap(MotionEvent e) {
                        return true;
                    }
                })
                .onRender(new OnRenderListener() {
                    @Override
                    public void onInitiallyRendered(int nbPages, float pageWidth, float pageHeight) {
                        pdfView.fitToWidth();
                    }
                })
                .enableAnnotationRendering(true)
                .invalidPageColor(Color.WHITE)
                .load();

        return view;
    }

}