...

app/src/main/java/com/base/scanqrclear/ui/exportpdf/ExportPdfActivity.kt

 package com.base.scanqrclear.ui.exportpdf
 
 import android.annotation.SuppressLint
+import android.content.Intent
+import android.graphics.Bitmap
+import android.net.Uri
 import android.view.Gravity
 import android.widget.LinearLayout
 import androidx.activity.addCallback
@@ -12,9 +15,14 @@ import com.base.scanqrclear.bean.FunctionUIBean.Companion.KEY_PRODUCT
 import com.base.scanqrclear.bean.FunctionUIBean.Companion.KEY_TEXT
 import com.base.scanqrclear.databinding.ActivityExportPdfBinding
 import com.base.scanqrclear.utils.BarUtils
+import com.base.scanqrclear.utils.ExportPdf.generatePdfWithTextAndImage
+import com.base.scanqrclear.utils.LogEx
 import com.base.scanqrclear.utils.QRCodeUtils
 import com.base.scanqrclear.utils.QRCodeUtils.generateQRCode
+import com.base.scanqrclear.utils.ToastUtils.toast
 import com.gyf.immersionbar.ktx.immersionBar
+import java.io.File
+import java.io.FileInputStream
 
 
 class ExportPdfActivity : BaseActivity<ActivityExportPdfBinding>(ActivityExportPdfBinding::inflate) {
@@ -22,6 +30,9 @@ class ExportPdfActivity : BaseActivity<ActivityExportPdfBinding>(ActivityExportP
     private var qrType: String = KEY_TEXT
     private var qrString: String = ""
 
+    private var pdfQrName: String = ""
+    private var pdfTempFile: File? = null
+
     @SuppressLint("SetTextI18n")
     override fun initView() {
         super.initView()
@@ -35,12 +46,14 @@ class ExportPdfActivity : BaseActivity<ActivityExportPdfBinding>(ActivityExportP
 
         when (qrType) {
             KEY_TEXT -> {
+                pdfQrName = "QR_TEXT"
                 binding.tvQrType.text = "QR_TEXT"
                 binding.tvQr.text = qrString
                 generateQRCode()
             }
 
             KEY_PRODUCT -> {
+                pdfQrName = "QR_PRODUCT"
                 binding.tvQrType.text = "QR_PRODUCT"
                 binding.tvQr.text = qrString
 
@@ -59,6 +72,8 @@ class ExportPdfActivity : BaseActivity<ActivityExportPdfBinding>(ActivityExportP
         Thread {
             val bitmap = generateQRCode(qrString, 735, 735, 5)
             runOnUiThread { binding.ivQr.setImageBitmap(bitmap) }
+
+            bitmap?.let { generatePdfFile(it, 0.5f, 30f) }
         }.start()
     }
 
@@ -66,9 +81,30 @@ class ExportPdfActivity : BaseActivity<ActivityExportPdfBinding>(ActivityExportP
         Thread {
             val bitmap = QRCodeUtils.generateEAN13Barcode(qrString, 648, 255)
             runOnUiThread { binding.ivQr.setImageBitmap(bitmap) }
+
+            bitmap?.let { generatePdfFile(it, 0.5f, 50f) }
         }.start()
     }
 
+    fun generatePdfFile(bitmap: Bitmap, scale: Float = 0.5f, margin: Float = 50f) {
+        val tempPdf = File(this.cacheDir, "${pdfQrName}_${System.currentTimeMillis()}.pdf")
+        this.cacheDir.mkdirs()
+        tempPdf.createNewFile()
+
+        val scaledBitmap = Bitmap.createScaledBitmap(
+            bitmap,
+            (bitmap.width * scale).toInt(),
+            (bitmap.height * scale).toInt(),
+            true
+        )
+
+        val flag = generatePdfWithTextAndImage(tempPdf, scaledBitmap, qrType, qrString, margin)
+        if (flag) {
+            LogEx.logDebug(TAG, "${tempPdf.absoluteFile}")
+            pdfTempFile = tempPdf
+        }
+    }
+
     override fun initListener() {
         super.initListener()
         onBackPressedDispatcher.addCallback {
@@ -78,10 +114,44 @@ class ExportPdfActivity : BaseActivity<ActivityExportPdfBinding>(ActivityExportP
             onBackPressedDispatcher.onBackPressed()
         }
         binding.tvSave.setOnClickListener {
-
+            pdfTempFile ?: return@setOnClickListener
+            launcher.launch(
+                Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
+                    addCategory(Intent.CATEGORY_OPENABLE)
+                    setType("application/pdf")
+                    putExtra(Intent.EXTRA_TITLE, pdfTempFile?.name)
+                }
+            ) { result ->
+                val uri: Uri? = result.data?.data
+                uri ?: return@launch
+                pdfTempFile?.let { writePdfContent(it, uri) }
+            }
         }
     }
 
+    private fun writePdfContent(file: File, uri: Uri) = Thread {
+
+        try {
+            val ips = FileInputStream(file)
+            val ops = contentResolver.openOutputStream(uri)
+
+            // 缓冲区大小
+            val buffer = ByteArray(1024)
+            var length: Int
+            while ((ips.read(buffer).also { length = it }) > 0) {
+                ops?.write(buffer, 0, length)
+            }
+            ips.close()
+            ops?.close()
+            runOnUiThread {
+                toast("save pdf success", true)
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+
+    }.start()
+
     override fun configSystemBar() {
         immersionBar {
             statusBarColor("#FFFFFFFF")

app/src/main/java/com/base/scanqrclear/utils/ExportPdf.kt

+package com.base.scanqrclear.utils
+
+import android.graphics.Bitmap
+import android.graphics.Color
+import android.graphics.Paint
+import android.graphics.pdf.PdfDocument
+import java.io.File
+import java.io.FileOutputStream
+
+object ExportPdf {
+
+
+    fun generatePdfWithTextAndImage(
+        file: File,
+        bitmap: Bitmap,
+        qrType: String,
+        qrString: String,
+        marginVertical: Float = 50f
+    ): Boolean {
+        // A4纸张大小（单位：点，1英寸=72点）
+        val pageWidth = 595
+        val pageHeight = 842
+
+        val pdfDocument = PdfDocument()
+        val pageInfo = PdfDocument.PageInfo.Builder(pageWidth, pageHeight, 1).create()
+        val page = pdfDocument.startPage(pageInfo)
+        val canvas = page.canvas
+
+        val imageWidth = bitmap.width
+        val imageHeight = bitmap.height
+
+        // 计算图片的绘制位置（水平和垂直居中）
+        val imageX = (pageWidth - imageWidth) / 2f
+        val imageY = (pageHeight - imageHeight) / 2f
+
+        // 绘制图片
+        canvas.drawBitmap(bitmap, imageX, imageY, null)
+
+
+        // 绘制文本和图片
+        val paint = Paint()
+        paint.color = Color.BLACK
+        paint.textSize = 25f // 设置文本大小
+        paint.textAlign = Paint.Align.CENTER // 文本居中对齐
+
+
+        // 计算顶部文本的绘制位置
+        val textTopY = imageY - marginVertical - paint.descent() // 图片上方50点
+        canvas.drawText(qrType, pageWidth / 2f, textTopY, paint)
+
+        // 计算底部文本的绘制位置
+        val textBottomY = imageY + imageHeight + marginVertical - paint.descent() // 图片下方50点
+        canvas.drawText(qrString, pageWidth / 2f, textBottomY + 25f, paint)
+
+        // 完成页面绘制
+        pdfDocument.finishPage(page)
+
+        try {
+            val outputStream = FileOutputStream(file)
+            pdfDocument.writeTo(outputStream)
+            pdfDocument.close()
+            outputStream.close()
+
+            return true
+        } catch (e: Exception) {
+
+        }
+
+        return false
+
+    }
+}
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