feat: pdf viewer
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18
module_base/src/main/java/com/lukouguoji/module_base/cache/PdfCacheModel.kt
vendored
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18
module_base/src/main/java/com/lukouguoji/module_base/cache/PdfCacheModel.kt
vendored
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package com.lukouguoji.module_base.cache
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import dev.DevUtils
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/**
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* PDF文件缓存管理
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* 负责PDF文件的下载和本地缓存
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*/
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object PdfCacheModel : FileCacheModel() {
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/**
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* PDF文件缓存目录
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* 路径: /data/data/com.lukouguoji.aerologic/files/cacheFiles/pdf/
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*/
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override fun folderPath(): String {
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return DevUtils.getContext().filesDir.toString() + "/cacheFiles/pdf/"
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}
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}
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package com.lukouguoji.module_base.ui.page.preview
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import android.annotation.SuppressLint
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import android.content.Context
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import android.content.Intent
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import android.content.pm.ActivityInfo
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import android.os.Bundle
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import android.view.View
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import androidx.lifecycle.lifecycleScope
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import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener
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import com.github.barteksc.pdfviewer.listener.OnPageChangeListener
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import com.github.barteksc.pdfviewer.listener.OnErrorListener
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import com.lukouguoji.module_base.R
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import com.lukouguoji.module_base.base.BaseBindingActivity
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import com.lukouguoji.module_base.cache.PdfCacheModel
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import com.lukouguoji.module_base.common.Constant
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import com.lukouguoji.module_base.databinding.ActivityPdfPreviewBinding
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import com.lukouguoji.module_base.impl.EmptyViewModel
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import com.lukouguoji.module_base.ktx.showToast
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import com.lukouguoji.module_base.util.MediaUtil
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import dev.utils.app.BarUtils
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.withContext
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import java.io.File
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/**
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* PDF预览界面
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* 支持在线PDF下载缓存和本地PDF文件预览
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*/
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class PdfPreviewActivity : BaseBindingActivity<ActivityPdfPreviewBinding, EmptyViewModel>() {
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// PDF文件路径 (可能是在线URL或本地路径)
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private var pdfPath: String = ""
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// 当前页码 (从0开始)
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private var currentPage = 0
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// 总页数
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private var totalPages = 0
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override fun layoutId() = R.layout.activity_pdf_preview
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override fun viewModelClass() = EmptyViewModel::class.java
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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// 强制横屏显示 (与项目其他页面保持一致)
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resources?.let {
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if (it.displayMetrics.widthPixels < it.displayMetrics.heightPixels) {
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requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
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} else {
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requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
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}
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}
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}
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@SuppressLint("SourceLockedOrientationActivity")
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override fun initOnCreate(savedInstanceState: Bundle?) {
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// 设置沉浸式状态栏
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BarUtils.transparentStatusBar(this)
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// 获取传递的PDF路径
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pdfPath = intent.getStringExtra(Constant.Key.DATA) ?: ""
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if (pdfPath.isEmpty()) {
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showToast("PDF路径为空")
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finish()
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return
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}
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// 设置关闭按钮
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binding.ivClose.setOnClickListener {
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finish()
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}
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// 加载PDF文件
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loadPdfFile()
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}
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/**
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* 加载PDF文件 (支持在线和本地)
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*/
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private fun loadPdfFile() {
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// val fullUrl = MediaUtil.fillUrl(pdfPath)
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val fullUrl = pdfPath
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// 判断是否为在线资源
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if (isOnlineResource(fullUrl)) {
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// 在线PDF: 先下载再加载
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downloadAndLoadPdf(fullUrl)
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} else {
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// 本地PDF: 直接加载
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loadLocalPdf(File(pdfPath))
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}
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}
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/**
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* 判断是否为在线资源
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*/
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private fun isOnlineResource(url: String): Boolean {
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return url.startsWith("http://") || url.startsWith("https://")
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}
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/**
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* 下载在线PDF并加载
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*/
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private fun downloadAndLoadPdf(url: String) {
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// 显示Loading
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showLoading()
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lifecycleScope.launch(Dispatchers.IO) {
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try {
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// 使用PdfCacheModel下载PDF
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PdfCacheModel.saveFile(
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url = url,
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onProgress = { progress ->
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// 更新下载进度
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lifecycleScope.launch(Dispatchers.Main) {
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binding.tvLoadingTip.text = "正在下载PDF... $progress%"
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}
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},
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onSuccess = { file ->
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// 下载成功，切换到主线程加载PDF
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lifecycleScope.launch(Dispatchers.Main) {
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hideLoading()
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loadLocalPdf(file)
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}
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},
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onError = { errorMsg ->
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// 下载失败
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lifecycleScope.launch(Dispatchers.Main) {
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hideLoading()
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showToast("PDF下载失败: $errorMsg")
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finish()
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}
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}
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)
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} catch (e: Exception) {
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withContext(Dispatchers.Main) {
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hideLoading()
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showToast("PDF下载异常: ${e.message}")
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finish()
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}
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}
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}
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}
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/**
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* 加载本地PDF文件
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*/
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private fun loadLocalPdf(file: File) {
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if (!file.exists()) {
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showToast("PDF文件不存在")
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finish()
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return
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}
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try {
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binding.pdfView.fromFile(file)
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.defaultPage(0) // 默认显示第一页
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.enableSwipe(true) // 启用滑动翻页
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.swipeHorizontal(false) // 垂直滑动
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.enableDoubletap(true) // 启用双击缩放
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.enableAnnotationRendering(false) // 禁用注释渲染(提升性能)
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.password(null) // PDF密码(如需要)
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.scrollHandle(null) // 禁用默认滚动条
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.onLoad(OnLoadCompleteListener { nbPages ->
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// PDF加载完成
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totalPages = nbPages
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updatePageIndicator()
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})
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.onPageChange(OnPageChangeListener { page, pageCount ->
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// 页面切换
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currentPage = page
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updatePageIndicator()
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})
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.onError(OnErrorListener { t ->
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// 加载错误
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showToast("PDF加载失败: ${t.message}")
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finish()
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})
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.load()
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} catch (e: Exception) {
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showToast("PDF渲染异常: ${e.message}")
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finish()
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}
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}
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/**
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* 更新页码指示器
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*/
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private fun updatePageIndicator() {
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binding.tvPageIndicator.text = "${currentPage + 1} / $totalPages"
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}
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/**
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* 显示Loading
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*/
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private fun showLoading() {
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binding.loadingLayout.visibility = View.VISIBLE
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}
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/**
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* 隐藏Loading
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*/
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private fun hideLoading() {
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binding.loadingLayout.visibility = View.GONE
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}
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companion object {
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/**
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* 启动PDF预览
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* @param context 上下文
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* @param pdfPath PDF路径 (支持在线URL或本地路径)
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*/
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@JvmStatic
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fun start(context: Context, pdfPath: String) {
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val starter = Intent(context, PdfPreviewActivity::class.java)
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.putExtra(Constant.Key.DATA, pdfPath)
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context.startActivity(starter)
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}
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}
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}
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