Generate Thumbnail of Pdf in Android
Using Android PDFRenderer Component
with(context) {
contentResolver.openFileDescriptor(uri, "r")?.use { parcelFileDescriptor ->
val pdfRenderer = PdfRenderer(parcelFileDescriptor).openPage(0)
val bitmap = Bitmap.createBitmap(pdfRenderer.width, pdfRenderer.height, Bitmap.Config.ARGB_8888)
pdfRenderer.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY)
pdfRenderer.close()
}
}
val file = Constant.allMediaList[position]
val filename = Environment.getExternalStoragePublicDirectory(file)
if (file != null) {
if (file.endsWith(".pdf")){
val fd :ParcelFileDescriptor= ParcelFileDescriptor.open(filename,ParcelFileDescriptor.MODE_READ_WRITE)
val pageNum: Int = 0;
val pdfiumCore: PdfiumCore = PdfiumCore(mContext);
try {
val pdfDocument: PdfDocument = pdfiumCore.newDocument(fd);
pdfiumCore.openPage(pdfDocument, pageNum);
val width: Int = pdfiumCore.getPageWidthPoint(pdfDocument, pageNum);
val height: Int = pdfiumCore.getPageHeightPoint(pdfDocument, pageNum);
// ARGB_8888 - best quality, high memory usage, higher possibility of OutOfMemoryError
// RGB_565 - little worse quality, twice less memory usage
val bitmap: Bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.RGB_565);
pdfiumCore.renderPageBitmap(pdfDocument, bitmap, pageNum, 0, 0,width, height);
//if you need to render annotations and form fields, you can use
//the same method above adding 'true' as last param
Glide.with(mContext)
.load(bitmap).into(holder.thumbnail)
pdfiumCore.closeDocument(pdfDocument); // important!
} catch(ex: IOException) {
ex.printStackTrace();
Toast.makeText(mContext,"failed",Toast.LENGTH_LONG).show()
}
}
Use PdfiumAndroid as mentioned by barteksc here.
Still working in 2021...
Sample Code for generating Pdf thumb
//PdfiumAndroid (https://github.com/barteksc/PdfiumAndroid)
//https://github.com/barteksc/AndroidPdfViewer/issues/49
void generateImageFromPdf(Uri pdfUri) {
int pageNumber = 0;
PdfiumCore pdfiumCore = new PdfiumCore(this);
try {
//http://www.programcreek.com/java-api-examples/index.php?api=android.os.ParcelFileDescriptor
ParcelFileDescriptor fd = getContentResolver().openFileDescriptor(pdfUri, "r");
PdfDocument pdfDocument = pdfiumCore.newDocument(fd);
pdfiumCore.openPage(pdfDocument, pageNumber);
int width = pdfiumCore.getPageWidthPoint(pdfDocument, pageNumber);
int height = pdfiumCore.getPageHeightPoint(pdfDocument, pageNumber);
Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
pdfiumCore.renderPageBitmap(pdfDocument, bmp, pageNumber, 0, 0, width, height);
saveImage(bmp);
pdfiumCore.closeDocument(pdfDocument); // important!
} catch(Exception e) {
//todo with exception
}
}
public final static String FOLDER = Environment.getExternalStorageDirectory() + "/PDF";
private void saveImage(Bitmap bmp) {
FileOutputStream out = null;
try {
File folder = new File(FOLDER);
if(!folder.exists())
folder.mkdirs();
File file = new File(folder, "PDF.png");
out = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance
} catch (Exception e) {
//todo with exception
} finally {
try {
if (out != null)
out.close();
} catch (Exception e) {
//todo with exception
}
}
}
Update:
Include the library in the build.gradle
implementation 'com.github.barteksc:android-pdf-viewer:3.2.0-beta.1'
For generating Image of any PDF Page:
Call the method generateImageFromPdf(uri) by passing any PDF uri that is stored in your storage.
The method will generate the PDF.png in the PDF folder of your storage.