添加分享，打印，功能。

app/src/main/AndroidManifest.xml

@@ -66,6 +66,16 @@
                 <data android:scheme="content" />
             </intent-filter>
         </activity>
+
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
     </application>
 
 </manifest>

app/src/main/java/com/all/pdfreader/pro/app/ui/adapter/PrintPdfAdapter.kt

@@ -0,0 +1,61 @@
+package com.all.pdfreader.pro.app.ui.adapter
+
+import android.content.Context
+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 java.io.FileOutputStream
+import java.io.InputStream
+
+class PrintPdfAdapter(private val context: Context, private val uri: Uri) : PrintDocumentAdapter() {
+
+    override fun onLayout(
+        printAttributes: PrintAttributes?,
+        printAttributes2: PrintAttributes?,
+        cancellationSignal: CancellationSignal,
+        layoutResultCallback: LayoutResultCallback,
+        bundle: Bundle?
+    ) {
+        if (cancellationSignal.isCanceled) {
+            layoutResultCallback.onLayoutCancelled()
+        } else {
+            layoutResultCallback.onLayoutFinished(
+                PrintDocumentInfo.Builder("AllPDF")
+                    .setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build(), true
+            )
+        }
+    }
+
+    override fun onWrite(
+        pageRangeArr: Array<PageRange?>?,
+        parcelFileDescriptor: ParcelFileDescriptor,
+        cancellationSignal: CancellationSignal?,
+        writeResultCallback: WriteResultCallback
+    ) {
+        try {
+            val openInputStream: InputStream? = context.contentResolver.openInputStream(uri)
+            val fileOutputStream = FileOutputStream(parcelFileDescriptor.fileDescriptor)
+            val bArr = ByteArray(1024)
+            while (true) {
+                val read = openInputStream?.read(bArr)
+                if (read != null) {
+                    if (read > 0) {
+                        fileOutputStream.write(bArr, 0, read)
+                    } else {
+                        writeResultCallback.onWriteFinished(arrayOf(PageRange.ALL_PAGES))
+                        openInputStream.close()
+                        fileOutputStream.close()
+                        return
+                    }
+                }
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+}

app/src/main/java/com/all/pdfreader/pro/app/ui/dialog/ListMoreDialogFragment.kt

@@ -1,20 +1,19 @@
 package com.all.pdfreader.pro.app.ui.dialog
 
+import android.net.Uri
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.Toast
 import androidx.fragment.app.activityViewModels
-import androidx.lifecycle.ViewModelProvider
-import androidx.lifecycle.lifecycleScope
 import com.all.pdfreader.pro.app.R
 import com.all.pdfreader.pro.app.databinding.DialogListMoreBinding
 import com.all.pdfreader.pro.app.room.entity.PdfDocumentEntity
-import com.all.pdfreader.pro.app.room.repository.PdfRepository
 import com.all.pdfreader.pro.app.util.AppUtils.dpToPx
+import com.all.pdfreader.pro.app.util.AppUtils.printPdfFile
 import com.all.pdfreader.pro.app.util.AppUtils.setClickWithAnimation
-import com.all.pdfreader.pro.app.util.FileUtils
+import com.all.pdfreader.pro.app.util.AppUtils.shareFile
 import com.all.pdfreader.pro.app.util.FileUtils.toFormatFileSize
 import com.all.pdfreader.pro.app.util.FileUtils.toSlashDate
 import com.all.pdfreader.pro.app.viewmodel.PdfViewModel
@@ -22,7 +21,6 @@ import com.bumptech.glide.Glide
 import com.bumptech.glide.load.resource.bitmap.CenterCrop
 import com.bumptech.glide.load.resource.bitmap.RoundedCorners
 import com.google.android.material.bottomsheet.BottomSheetDialogFragment
-import kotlinx.coroutines.launch
 import java.io.File
 
 class ListMoreDialogFragment(val filePath: String) : BottomSheetDialogFragment() {
@@ -97,6 +95,14 @@ class ListMoreDialogFragment(val filePath: String) : BottomSheetDialogFragment()
             FileDetailsDialogFragment().show(parentFragmentManager, "FileDetailsDialogFragment")
             dismiss()
         }
+        binding.shareBtn.setOnClickListener {
+            shareFile(requireActivity(), File(pdfDocument.filePath))
+            dismiss()
+        }
+        binding.printBtn.setOnClickListener {
+            printPdfFile(requireActivity(), Uri.fromFile(File(pdfDocument.filePath)))
+            dismiss()
+        }
     }
 
     private fun updateCollectUi(b: Boolean) {

app/src/main/java/com/all/pdfreader/pro/app/util/AppUtils.kt

@@ -2,10 +2,38 @@ package com.all.pdfreader.pro.app.util
 
 import android.app.Activity
 import android.content.Context
+import android.content.Intent
+import android.graphics.Bitmap
+import android.graphics.pdf.PdfRenderer
+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 android.print.PrintManager
+import android.print.pdf.PrintedPdfDocument
 import android.view.View
 import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
+import android.webkit.MimeTypeMap
+import android.webkit.WebView
+import android.webkit.WebViewClient
 import android.widget.EditText
+import android.widget.Toast
+import androidx.core.content.FileProvider
+import com.all.pdfreader.pro.app.R
+import java.io.File
+import java.io.FileOutputStream
+import androidx.core.graphics.createBitmap
+import androidx.print.PrintHelper
+import com.all.pdfreader.pro.app.ui.adapter.PrintPdfAdapter
+import com.shockwave.pdfium.PdfPasswordException
+import com.shockwave.pdfium.PdfiumCore
+import com.tom_roush.pdfbox.pdmodel.common.PDPageLabelRange
+import java.io.IOException
 
 object AppUtils {
 
@@ -62,4 +90,81 @@ object AppUtils {
         }, 200)
     }
 
+    /**
+     * 分享文件（自动识别 MIME 类型）
+     * @param context 上下文
+     * @param file 要分享的文件
+     */
+    fun shareFile(context: Context, file: File) {
+        try {
+            if (!file.exists()) {
+                Toast.makeText(context, context.getString(R.string.error_file_not_exist), Toast.LENGTH_SHORT).show()
+                return
+            }
+
+            val uri: Uri = FileProvider.getUriForFile(
+                context,
+                "${context.packageName}.fileprovider",
+                file
+            )
+
+            val mimeType = getMimeType(file) ?: "*/*"
+
+            val shareIntent = Intent(Intent.ACTION_SEND).apply {
+                type = mimeType
+                putExtra(Intent.EXTRA_STREAM, uri)
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            }
+
+            context.startActivity(
+                Intent.createChooser(shareIntent, "share")
+                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            )
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
+    /**
+     * 根据文件扩展名自动获取 MIME 类型
+     */
+    private fun getMimeType(file: File): String? {
+        val extension = file.extension.lowercase()
+        return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension)
+    }
+
+    /**
+     * 打印PDF，传入uri
+     */
+    fun printPdfFile(context: Context, uri: Uri?) {
+        try {
+            PdfiumCore(context).newDocument(
+                context.contentResolver.openFileDescriptor(
+                    uri!!,
+                    PDPageLabelRange.STYLE_ROMAN_LOWER
+                )
+            )
+            if (PrintHelper.systemSupportsPrint()) {
+                val printManager =
+                    context.getSystemService(Context.PRINT_SERVICE) as PrintManager
+                val str = context.getString(R.string.app_name) + " Document"
+                printManager.print(
+                    str,
+                    PrintPdfAdapter(context, uri),
+                    null as PrintAttributes?
+                )
+                return
+            }
+            Toast.makeText(context, R.string.device_does_not_support_printing, Toast.LENGTH_LONG).show()
+        } catch (e: PdfPasswordException) {
+            Toast.makeText(context, R.string.pdf_cant_print_password_protected, Toast.LENGTH_LONG).show()
+            e.printStackTrace()
+        } catch (e2: IOException) {
+            Toast.makeText(context, R.string.cannot_print_malformed_pdf, Toast.LENGTH_LONG).show()
+            e2.printStackTrace()
+        } catch (e3: java.lang.Exception) {
+            Toast.makeText(context, R.string.pdf_cannot_print_error, Toast.LENGTH_LONG).show()
+            e3.printStackTrace()
+        }
+    }
 }

app/src/main/java/com/all/pdfreader/pro/app/util/PdfScanner.kt

@@ -274,47 +274,6 @@ class PdfScanner(
         return TimeUnit.MILLISECONDS.toHours(System.currentTimeMillis() - lastScan)
     }
 
-
-//    private fun generateFastThumbnail(context: Context, pdfFile: File): String? {
-//        return try {
-//            val fileDescriptor =
-//                ParcelFileDescriptor.open(pdfFile, ParcelFileDescriptor.MODE_READ_ONLY)
-//            val pdfRenderer = PdfRenderer(fileDescriptor)
-//
-//            if (pdfRenderer.pageCount > 0) {
-//                val page = pdfRenderer.openPage(0)
-//                // 创建 Bitmap
-//                val bitmap = createBitmap(page.width, page.height)
-//                val canvas = Canvas(bitmap)
-//                canvas.drawColor(Color.WHITE) // 填充白色背景
-//
-//                page.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY)
-//                page.close()
-//
-//                // 保存到缓存目录
-//                val cacheDir = File(context.cacheDir, "thumbnails")
-//                if (!cacheDir.exists()) cacheDir.mkdirs()
-//                val thumbFile = File(cacheDir, pdfFile.nameWithoutExtension + ".jpg")
-//
-//                FileOutputStream(thumbFile).use { out ->
-//                    bitmap.compress(Bitmap.CompressFormat.JPEG, 80, out)
-//                }
-//
-//                pdfRenderer.close()
-//                fileDescriptor.close()
-//
-//                thumbFile.absolutePath
-//            } else {
-//                pdfRenderer.close()
-//                fileDescriptor.close()
-//                null
-//            }
-//        } catch (e: Exception) {
-//            e.printStackTrace()
-//            null
-//        }
-//    }
-
     private fun generateFastThumbnail(
         context: Context,
         pdfFile: File,

app/src/main/res/layout/dialog_list_more.xml

@@ -169,6 +169,7 @@
         </LinearLayout>
 
         <LinearLayout
+            android:id="@+id/shareBtn"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
@@ -191,6 +192,7 @@
         </LinearLayout>
 
         <LinearLayout
+            android:id="@+id/printBtn"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"

app/src/main/res/values/strings.xml

@@ -84,4 +84,8 @@
     <string name="last_modified">Last Modified</string>
     <string name="last_viewed">Last Viewed</string>
     <string name="size">Size</string>
+    <string name="device_does_not_support_printing">Your device does not support printing</string>
+    <string name="pdf_cant_print_password_protected">Cannot print a password protected PDF file</string>
+    <string name="cannot_print_malformed_pdf">Cannot print a malformed PDF file</string>
+    <string name="pdf_cannot_print_error">Cannot print PDF file, Unknown error has occurred</string>
 </resources>

app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- 允许分享外部存储中的文件 -->
+    <external-path
+        name="external_files"
+        path="." />
+</paths>