Add PDF printing support

Author: kylecorry31

build.gradle.kts

@@ -1,7 +1,7 @@
 buildscript {
     extra.apply {
         set("groupId", "com.kylecorry.andromeda")
-        set("versionName", "10.2.0")
+        set("versionName", "10.3.0")
         set("targetVersion", 35)
         set("compileVersion", 35)
     }

print/src/main/java/com/kylecorry/andromeda/print/PdfDocumentAdapter.kt

@@ -0,0 +1,71 @@
+package com.kylecorry.andromeda.print
+
+import android.net.Uri
+import android.os.Bundle
+import android.os.CancellationSignal
+import android.os.ParcelFileDescriptor
+import android.print.PageRange
+import android.print.PrintAttributes
+import android.print.PrintDocumentAdapter
+import android.print.PrintDocumentInfo
+import androidx.print.PrintHelper
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.util.UUID
+
+internal class PdfDocumentAdapter(private val uri: Uri, private val callback: PrintHelper.OnPrintFinishCallback) :
+    PrintDocumentAdapter() {
+
+    override fun onLayout(
+        oldAttributes: PrintAttributes?,
+        newAttributes: PrintAttributes,
+        cancellationSignal: CancellationSignal?,
+        callback: LayoutResultCallback,
+        bundle: Bundle
+    ) {
+        if (cancellationSignal?.isCanceled == true) {
+            callback.onLayoutCancelled()
+            return
+        } else {
+            val builder =
+                PrintDocumentInfo.Builder(
+                    uri.lastPathSegment ?: "${UUID.randomUUID()}.pdf"
+                )
+            builder.setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT)
+                .setPageCount(PrintDocumentInfo.PAGE_COUNT_UNKNOWN)
+                .build()
+
+            callback.onLayoutFinished(builder.build(), newAttributes == oldAttributes)
+        }
+    }
+
+    override fun onWrite(
+        pageRanges: Array<out PageRange>,
+        destination: ParcelFileDescriptor,
+        cancellationSignal: CancellationSignal?,
+        callback: WriteResultCallback
+    ) {
+        try {
+            // copy file from the input stream to the output stream
+            FileInputStream(uri.path).use { inStream ->
+                FileOutputStream(destination.fileDescriptor).use { outStream ->
+                    inStream.copyTo(outStream)
+                }
+            }
+
+            if (cancellationSignal?.isCanceled == true) {
+                callback.onWriteCancelled()
+            } else {
+                callback.onWriteFinished(arrayOf(PageRange.ALL_PAGES))
+            }
+
+        } catch (e: Exception) {
+            callback.onWriteFailed(e.message)
+        }
+    }
+
+    override fun onFinish() {
+        super.onFinish()
+        callback.onFinish()
+    }
+}

print/src/main/java/com/kylecorry/andromeda/print/Printer.kt

@@ -3,6 +3,9 @@ package com.kylecorry.andromeda.print
 import android.content.Context
 import android.graphics.Bitmap
 import android.net.Uri
+import android.print.PrintAttributes
+import android.print.PrintManager
+import androidx.core.content.getSystemService
 import androidx.print.PrintHelper
 import kotlinx.coroutines.suspendCancellableCoroutine
 import java.util.UUID
@@ -11,6 +14,8 @@ import kotlin.coroutines.resume
 class Printer(context: Context) {
 
     private val helper = PrintHelper(context)
+    private val printManager = context.getSystemService<PrintManager>()
+    private val attributesBuilder = PrintAttributes.Builder()
 
     fun setScaleMode(scaleMode: ScaleMode) {
         helper.scaleMode = when (scaleMode) {
@@ -24,13 +29,25 @@ class Printer(context: Context) {
             ColorMode.Color -> PrintHelper.COLOR_MODE_COLOR
             ColorMode.Monochrome -> PrintHelper.COLOR_MODE_MONOCHROME
         }
+        attributesBuilder.setColorMode(
+            when (colorMode) {
+                ColorMode.Color -> PrintAttributes.COLOR_MODE_COLOR
+                ColorMode.Monochrome -> PrintAttributes.COLOR_MODE_MONOCHROME
+            }
+        )
     }
 
     fun setOrientation(orientation: Orientation) {
         helper.orientation = when (orientation) {
             Orientation.Portrait -> PrintHelper.ORIENTATION_PORTRAIT
             Orientation.Landscape -> PrintHelper.ORIENTATION_LANDSCAPE
         }
+        attributesBuilder.setMediaSize(
+            when (orientation) {
+                Orientation.Portrait -> PrintAttributes.MediaSize.UNKNOWN_PORTRAIT
+                Orientation.Landscape -> PrintAttributes.MediaSize.UNKNOWN_LANDSCAPE
+            }
+        )
     }
 
     fun print(bitmap: Bitmap, onFinished: (String) -> Unit = {}): String {
@@ -41,7 +58,16 @@ class Printer(context: Context) {
 
     fun print(uri: Uri, onFinished: (String) -> Unit = {}): String {
         val jobName = createJobName()
-        helper.printBitmap(jobName, uri) { onFinished(jobName) }
+        // If it is a PDF, print it using the print manager
+        if (uri.toString().endsWith(".pdf", true)) {
+            printManager?.print(
+                jobName,
+                PdfDocumentAdapter(uri) { onFinished(jobName) },
+                attributesBuilder.build()
+            )
+        } else {
+            helper.printBitmap(jobName, uri) { onFinished(jobName) }
+        }
         return jobName
     }