이미지를 pdf로 저장하기

참고

https://www.baeldung.com/java-pdf-creation 

itext 를 이용하는 방법

라이센스 문제가 있다. 상업적 이용은 라이센스를 구매하거나, 구매하지 않는다면  내 소스코드를 공개해야한다.  (AGPL)

    implementation 'com.itextpdf:itextg:5.5.10' // images to pdf
	// or     implementation 'com.itextpdf:itextpdf:5.5.13.4' // images to pdf

import com.itextpdf.text.Document
import com.itextpdf.text.Image
import com.itextpdf.text.PageSize
import com.itextpdf.text.pdf.PdfWriter

import java.io.ByteArrayOutputStream
import java.io.FileInputStream

// itextpdf
    fun writeImagesForItext(uriStrList: List<String>, outputUri: Uri): Int {
        var count: Int = 0
        try {
            val document = Document(PageSize.A4, 15f, 15f, 15f, 15f)
            val pdfWriter = PdfWriter.getInstance(document, contentResolver.openOutputStream(outputUri))
            document.open()
            val stream = ByteArrayOutputStream()
            for (uriStr in uriStrList) {
                try {
                    stream.reset() // for reuse
                    val uri = Uri.parse(uriStr)
                    val bitmap: Bitmap = if (uri.scheme != "content") {
                        BitmapFactory.decodeStream(FileInputStream(uriStr))
                    } else {
                        contentResolver.openInputStream(uri).use {
                            BitmapFactory.decodeStream(it)
                        }
                    }

                    var quality = Settings.writePdfImageQuality.value
                    if (quality < 5) quality = 5
                    if (quality > 100) quality = 100
                    bitmap.compress(Bitmap.CompressFormat.JPEG, quality, stream)
                    if (true) {
                        val image = Image.getInstance(stream.toByteArray())
                        document.setPageSize(image)
                        document.newPage()
                        image.setAbsolutePosition(0f, 0f)
                        document.add(image)
                    }
                    bitmap.recycle()
                    count++
                } catch (ex: Exception) {
                    if (BuildConfig.DEBUG) {
                        DUtils.alert(ex.toString())
                    }
                }
            }

            // close
            document.close()
            pdfWriter?.close()
        } catch (ex: Exception) {
            if (BuildConfig.DEBUG) {
                DUtils.alert(ex.toString())
            }
        }
        return count
    }

 

Apache pdfbox를 이용하는 방법

https://pdfbox.apache.org/download.html 를 이용할 수 있지만  Android에서는 바로 사용할 수 없다. Android으로 랩핑한 라이브러리를 이용한다. https://github.com/TomRoush/PdfBox-Android 

implementation 'com.tom-roush:pdfbox-android:2.0.27.0'

import com.tom_roush.pdfbox.pdmodel.PDDocument
import com.tom_roush.pdfbox.pdmodel.PDPage
import com.tom_roush.pdfbox.pdmodel.PDPageContentStream
import com.tom_roush.pdfbox.pdmodel.common.PDRectangle
import com.tom_roush.pdfbox.pdmodel.graphics.image.PDImageXObject



// apache pdfbox
    fun writeImagesForPdfBox(uriStrList: List<String>, outputUri: Uri): Int {
        var count: Int = 0
        try {
            val document = PDDocument()
            val stream = ByteArrayOutputStream()
            for (uriStr in uriStrList) {
                try {
                    stream.reset() // for reuse
                    val uri = Uri.parse(uriStr)
                    val bitmap: Bitmap = if (uri.scheme != "content") {
                        BitmapFactory.decodeStream(FileInputStream(uriStr))
                    } else {
                        contentResolver.openInputStream(uri).use {
                            BitmapFactory.decodeStream(it)
                        }
                    }

                    var quality = Settings.writePdfImageQuality.value
                    if (quality < 5) quality = 5
                    if (quality > 100) quality = 100
                    bitmap.compress(Bitmap.CompressFormat.JPEG, quality, stream)
                    if (true) {
                        val page = PDPage(PDRectangle(bitmap.width.toFloat(), bitmap.height.toFloat()))
                        document.addPage(page)
                        val img = PDImageXObject.createFromByteArray(document, stream.toByteArray(), "test")
                        val contentStream = PDPageContentStream(document, page)
                        contentStream.drawImage(img, 0f, 0f)
                        contentStream.close()
                    }
                    bitmap.recycle()
                    count++
                } catch (ex: Exception) {
                    if (BuildConfig.DEBUG) {
                        DUtils.alert(ex.toString())
                    }
                }
            }

            document.save(contentResolver.openOutputStream(outputUri));
            document.close();
        } catch (ex: Exception) {
            if (BuildConfig.DEBUG) {
                DUtils.alert(ex.toString())
            }
        }
        return count
    }