Android 本地预览Excel,Word,PPT,PDF [ 解决Android asposed转Excel乱码问题 ]

Posted 2022-01-27 RedWolfChao

android 本地预览Excel,Word,PPT,PDF

解决Android asposed转Excel乱码问题

近期获得一个需求, 要求做一个类似WPS的功能, 不过只需要预览不需要编辑

Android本身没有提供预览Office的组件, 百度后发现腾讯TBS可以做到这一点,试了下,效果不尽人意;

• 附腾讯TBS链接 : https://x5.tencent.com/tbs/index.html

我采用的方案是首先通过aspose将excel,word,ppt转为pdf, 然后用PdfViewer打开;

• aspose链接 : https://www.aspose.com/

• PdfViewer链接 : https://github.com/barteksc/AndroidPdfViewer

• 需要引入cells , slides ,words 三个Jar包, 分别对应 Excel , PPT , Word ;

Jar包连带源码都下最后附上链接, jar包也可以直接用aspose官网下载;

https://download.csdn.net/download/RedWolfChao/18805327

运行效果实例

部分代码实例 :

选择文件【调用系统的文件管理】

/**
 * 选择文件【调用系统的文件管理】
 */
private fun chooseFile() 
    startActivityForResult(Intent().apply 
        action = Intent.ACTION_GET_CONTENT
        type = "*/*"
        addCategory(Intent.CATEGORY_OPENABLE)
    , REQUEST_CHOOSE_FILE)

onActivityResult

//  选择文件返回
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) 
        super.onActivityResult(requestCode, resultCode, data)
        if (resultCode == RESULT_OK) 
            if (requestCode == REQUEST_CHOOSE_FILE) 
                data?.let 
                    val uri = it.data
                    val path = FileChooseUtil.getInstance(this).getChooseFileResultPath(uri)
                    openFile(path)
                
            
        
    

openFile

private fun openFile(path: String) 
    loading.visibility = View.VISIBLE
    GlobalScope.launch 
        val realPath = getRealPath(path)
        runOnUiThread 
            loading.visibility = View.INVISIBLE
            if (TextUtils.isEmpty(realPath)) 
                ToastUtils.showShort("格式不支持")
                return@runOnUiThread
            
            pdfView.fromFile(File(realPath))
                .pages(0, 2, 1, 3, 3, 3) // all pages are displayed by default
                .enableSwipe(true) // allows to block changing pages using swipe
                .swipeHorizontal(false)
                .enableDoubletap(true)
                .defaultPage(0)
                .onError 
                    ToastUtils.showLong("onError: $it.message ")
                
                .onTap  false 
                .enableAnnotationRendering(false) // render annotations (such as comments, colors or forms)
                .password(null)
                .scrollHandle(null)
                .enableAntialiasing(true) // improve rendering a little bit on low-res screens
                // spacing between pages in dp. To define spacing color, set view background
                .spacing(0)
                .autoSpacing(false) // add dynamic spacing to fit each page on its own on the screen
                .linkHandler 
                .pageFitPolicy(FitPolicy.WIDTH) // mode to fit pages in the view
                .fitEachPage(false) // fit each page to the view, else smaller pages are scaled relative to largest page.
                .pageSnap(false) // snap pages to screen boundaries
                .pageFling(false) // make a fling change only a single page like ViewPager
                .nightMode(false) // toggle night mode
                .load()
        
    

getRealPath

/**
 * 获取PDF路径
 */
private fun getRealPath(path: String): String 
    //  首先需要判断 原始类型是否为PDF
    val type = getFileType(path)
    val fileName = getFileName(path)
    //  如果是PDF 直接返回
    if (type == "pdf") 
        return path
    
    val realPath = tempDir + File.separator + fileName + type + ".pdf"
    //  如果已存在 直接返回
    if (File(realPath).exists()) 
        return realPath
    
    //  Word
    if (type == "doc" || type == "docx") 
        try 
            val document = Document(path)
            document.save(realPath, SaveFormat.PDF)
            return realPath
         catch (e: Exception) 
            e.printStackTrace()
        
        //  Excel
     else if (type == "xlsx" || type == "xls") 
        try 
            AsposedUtils.excel2pdf(path, realPath)
            return realPath
         catch (e: Exception) 
            e.printStackTrace()
        
        //  PPT
     else if (type == "ppt" || type == "pptx") 
        try 
            AsposedUtils.ppt2pdf(path, realPath)
            return realPath
         catch (e: Exception) 
            e.printStackTrace()
        
    
    return ""

解决aspose excel转换后中文乱码问题

• 复制中文字体[随便选一个, 我选的微软雅黑]到assets中
• 将assets中的字体拷贝到储存中
• 转换Excel时, 将字体传给Workbook
• tempDir 下有微软雅黑字体

fun excel2pdf(sourceFilePath: String, desFilePath: String) 
    try 
        //  中文乱码处理  主要是设置微软雅黑字体
        val configs = IndividualFontConfigs()
        configs.setFontFolder(tempDir, true)
        val loadOptions = LoadOptions()
        loadOptions.fontConfigs = configs
        //  loadOptions.languageCode = CountryCode.CHINA
        val pdfSaveOptions = PdfSaveOptions()
        pdfSaveOptions.onePagePerSheet = true
        //  原始excel路径
        val wb = Workbook(sourceFilePath, loadOptions)
        val fileOS = FileOutputStream(desFilePath)
        //  数组为几就展示几页
        val showSheets = intArrayOf(wb.worksheets.count)
        //  隐藏workbook中不需要的sheet页。
        //  printSheetPage(wb, showSheets)
        wb.save(fileOS, pdfSaveOptions)
        fileOS.flush()
        fileOS.close()
        println("完毕")
     catch (e: Exception) 
        e.printStackTrace()