添加移除密码对话框。

app/src/main/java/com/all/pdfreader/pro/app/model/FileActionEvent.kt

@@ -12,4 +12,8 @@ sealed class FileActionEvent {
     data class SetPassword(val status: Status, val success: Boolean? = null) : FileActionEvent() {
         enum class Status { START, COMPLETE }
     }
+
+    data class RemovePassword(val status: Status, val success: Boolean? = null) : FileActionEvent() {
+        enum class Status { START, COMPLETE }
+    }
 }

app/src/main/java/com/all/pdfreader/pro/app/ui/act/MainActivity.kt

@@ -123,6 +123,25 @@ class MainActivity : BaseActivity(), PermissionDialogFragment.PermissionCallback
                         }
                     }
                 }
+
+                is FileActionEvent.RemovePassword -> {
+                    when (event.status) {
+                        FileActionEvent.RemovePassword.Status.START -> {
+                            progressDialog = ProgressDialogFragment()
+                            progressDialog?.show(supportFragmentManager, "progressDialog")
+                        }
+
+                        FileActionEvent.RemovePassword.Status.COMPLETE -> {
+                            progressDialog?.dismiss()
+                            progressDialog = null
+                            if (event.success == true) {
+                                showToast(getString(R.string.remove_password_successfully))
+                            } else {
+                                showToast(getString(R.string.remove_password_failed))
+                            }
+                        }
+                    }
+                }
             }
         }
     }

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

@@ -110,7 +110,7 @@ class ListMoreDialogFragment(val filePath: String) : BottomSheetDialogFragment()
         }
         binding.setPasswordBtn.setOnClickListener {
             if (pdfDocument.isPassword) {
-
+                PdfRemovePasswordDialog().show(parentFragmentManager, "PdfRemovePasswordDialog")
             } else {
                 PdfSetPasswordDialog().show(parentFragmentManager, "PdfSetPasswordDialog")
             }

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

@@ -0,0 +1,81 @@
+package com.all.pdfreader.pro.app.ui.dialog
+
+import android.graphics.Color
+import android.os.Bundle
+import android.text.Editable
+import android.text.TextWatcher
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Toast
+import androidx.core.graphics.drawable.toDrawable
+import androidx.fragment.app.DialogFragment
+import androidx.fragment.app.activityViewModels
+import com.all.pdfreader.pro.app.R
+import com.all.pdfreader.pro.app.databinding.DialogPdfRemovePasswordBinding
+import com.all.pdfreader.pro.app.databinding.DialogPdfSetPasswordBinding
+import com.all.pdfreader.pro.app.room.entity.PdfDocumentEntity
+import com.all.pdfreader.pro.app.util.AppUtils.showKeyboard
+import com.all.pdfreader.pro.app.util.PdfSecurityUtils
+import com.all.pdfreader.pro.app.viewmodel.PdfViewModel
+import kotlin.getValue
+
+class PdfRemovePasswordDialog() : DialogFragment(
+
+) {
+    private lateinit var binding: DialogPdfRemovePasswordBinding
+    private val viewModel: PdfViewModel by activityViewModels()
+    private lateinit var pdfDocument: PdfDocumentEntity
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
+    ): View? {
+        binding = DialogPdfRemovePasswordBinding.inflate(layoutInflater)
+        return binding.root
+    }
+
+    override fun onStart() {
+        super.onStart()
+        isCancelable = false
+        dialog?.window?.apply {
+            // 去掉系统默认的背景 padding
+            setBackgroundDrawable(Color.TRANSPARENT.toDrawable())
+            // 设置宽度为全屏减去 16dp
+            val margin = resources.getDimensionPixelSize(R.dimen.dialog_margin) // 16dp
+            val width = resources.displayMetrics.widthPixels - margin * 2
+            setLayout(width, ViewGroup.LayoutParams.WRAP_CONTENT)
+        }
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        viewModel.pdfDocument.value?.let {
+            pdfDocument = it
+            binding.etPassword.showKeyboard()
+            setupListeners()
+        } ?: run {
+            showToast(getString(R.string.file_not))
+            dismiss()
+        }
+    }
+
+    private fun setupListeners() {
+        binding.tvCancel.setOnClickListener {
+            dismiss()
+        }
+
+        binding.tvConfirm.setOnClickListener {
+            val password = binding.etPassword.text.toString()
+            if (PdfSecurityUtils.isPdfPasswordCorrect(pdfDocument.filePath, password)) {
+                viewModel.removePassword(pdfDocument.filePath, password)
+                dismiss()
+            } else {
+                binding.tilPassword.error = getString(R.string.incorrect_password)
+            }
+        }
+    }
+
+    private fun showToast(message: String) {
+        Toast.makeText(requireActivity(), message, Toast.LENGTH_SHORT).show()
+    }
+}

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

@@ -41,4 +41,16 @@ object PdfSecurityUtils {
             false // 返回解密失败的标志
         }
     }
+
+    fun isPdfPasswordCorrect(filePath: String, password: String): Boolean {
+        return try {
+            // 只尝试打开 PDF，不读取页面内容
+            PDDocument.load(File(filePath), password).use { document ->
+                // 如果能成功打开且不抛异常，则密码正确
+                true
+            }
+        } catch (e: Exception) {
+            false
+        }
+    }
 }

app/src/main/java/com/all/pdfreader/pro/app/viewmodel/PdfViewModel.kt

@@ -151,4 +151,25 @@ class PdfViewModel : ViewModel() {
             )
         }
     }
+
+    fun removePassword(filePath: String, password: String) {
+        viewModelScope.launch {
+            _fileActionEvent.postValue(FileActionEvent.RemovePassword(FileActionEvent.RemovePassword.Status.START))
+
+            val success = withContext(Dispatchers.IO) {
+                PdfSecurityUtils.removePasswordFromPdf(filePath, password).also {
+                    if (it) {
+                        pdfRepository.updateIsPassword(filePath, false)
+                    }
+                }
+            }
+
+            _fileActionEvent.postValue(
+                FileActionEvent.SetPassword(
+                    FileActionEvent.SetPassword.Status.COMPLETE,
+                    success
+                )
+            )
+        }
+    }
 }

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

@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="@drawable/dr_rounded_corner_12_bg_white"
+    android:orientation="vertical"
+    android:padding="24dp">
+
+    <TextView
+        android:id="@+id/tvTitle"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:fontFamily="@font/poppins_semibold"
+        android:text="@string/remove_password"
+        android:textColor="@color/black"
+        android:textSize="20sp" />
+
+    <TextView
+        android:id="@+id/tvMessage"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:fontFamily="@font/poppins_regular"
+        android:text="@string/remove_password_dialog_desc"
+        android:textColor="@color/black_60"
+        android:textSize="14sp" />
+
+    <RelativeLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp">
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:id="@+id/tilPassword"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="@string/enter_password"
+            app:endIconDrawable="@drawable/dr_password_state"
+            app:endIconMode="password_toggle"
+            app:passwordToggleEnabled="true">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/etPassword"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:fontFamily="@font/poppins_regular"
+                android:inputType="textPassword"
+                android:textSize="16sp" />
+
+        </com.google.android.material.textfield.TextInputLayout>
+
+    </RelativeLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="end"
+        android:orientation="horizontal">
+
+        <TextView
+            android:id="@+id/tvCancel"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="8dp"
+            android:fontFamily="@font/poppins_regular"
+            android:padding="12dp"
+            android:text="@string/cancel"
+            android:textColor="@color/black_80"
+            android:textSize="16sp" />
+
+        <TextView
+            android:id="@+id/tvConfirm"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:fontFamily="@font/poppins_medium"
+            android:padding="12dp"
+            android:text="@string/ok"
+            android:textColor="@color/black"
+            android:textSize="16sp" />
+
+    </LinearLayout>
+
+</LinearLayout>

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

@@ -52,6 +52,7 @@
     <string name="set_password_successfully">Set Password successfully</string>
     <string name="set_password_failed">Set Password failed</string>
     <string name="remove_password">Remove Password</string>
+    <string name="remove_password_dialog_desc">This file will no longer be password protected.</string>
     <string name="remove_password_successfully">Remove Password successfully</string>
     <string name="remove_password_failed">Remove Password failed</string>
     <string name="duplicate_file">Duplicate File</string>