看官_Android中Kotlin创建PDF

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一、创建 PDF 流程

首先看官网的文档&＃xff0c;下面介绍基于 SDK 怎么样来创建 PDF 文件的流程。

//先创建一个 PdfDocument 对象 document
PdfDocument document &＃61; new PdfDocument();
//创建 PageInfo 对象&＃xff0c;用于描述 PDF 中单个的页面
PageInfo pageInfo &＃61; new PageInfo.Builder(new Rect(0, 0, 100, 100), 1).create();
//开始启动内容填写
Page page &＃61; document.startPage(pageInfo);
//绘制文字。
page.canvas.drawText("PDF绘制",70.0f,200.0f, mPaint)
//停止对页面的填写
document.finishPage(page);
. . .
//将文件写入流
document.writeTo(getOutputStream());
//关闭流
document.close();

二、创建PDF实例

接下来参考创建流程进行代码的编写&＃xff0c;创建Activity。

进行一个简单的例子&＃xff0c;在一页PDF中绘制一个标题、内容及加载图片。

class PdfActivity
private val CODE_WRITE_EXTERNAL &＃61; 1
var file : File? &＃61; null
var mPaint : Paint? &＃61; null
var matrix : Matrix? &＃61; null
var screenWidth : Int &＃61; 210*28/10
var screenHeight : Int &＃61; 297*28/10
val document &＃61; PdfDocument()
var str : String &＃61; ""
public fun creatPDF(file:String)
str &＃61; "pdfFile"
mPaint &＃61; Paint()
mPaint?.isAntiAlias &＃61; true
mPaint?.strokeWidth &＃61; 10.0f
mPaint?.isFakeBoldText &＃61; true
mPaint?.color &＃61; Color.BLACK
mPaint?.textSize &＃61; 35.0f
matrix &＃61; Matrix()
matrix?.setScale(0.5f, 0.5f)
matrix?.postScale(0.15f,0.15f)
val root &＃61; Environment.getExternalStorageDirectory()
//val showBitmap : Bitmap &＃61; BitmapFactory.decodeResource(getResources(), &＃39;banlei.png&＃39;)
val showBitmap &＃61; BitmapFactory.decodeFile("/sdcard/test.png") //放到设备中的一张图片路径
var bitMapWidth : Int &＃61; showBitmap.getWidth()
var bitMapHeight : Int &＃61; showBitmap.getHeight()
val bm : Bitmap &＃61; Bitmap.createBitmap(
showBitmap, 0, 0, showBitmap.width,
showBitmap.height, matrix, true
)
val info1 &＃61; PdfDocument.PageInfo.Builder(
screenWidth, screenHeight, 1
).create()
val page1 &＃61; document.startPage(info1)
mPaint?.let page1.canvas.drawText("PDF文档报告",170.0f,130.0f, it)
mPaint?.textSize &＃61; 20.0f
mPaint?.let page1.canvas.drawText("PDF中的内容信息描述",70.0f,200.0f, it)
mPaint?.let page1.canvas.drawBitmap(bm, 350.0f, 500.0f, it)
document.finishPage(page1)
try
document.writeTo(outputStream)
catch (e: IOException)
e.printStackTrace()

//toast("生成pdf成功&＃xff0c;路径:$file")
document.close()

private val outputStream: OutputStream?
get()
val root &＃61; Environment.getExternalStorageDirectory()
val filePath &＃61; Environment.getExternalStorageDirectory().absolutePath &＃43; "/PdfPath/" &＃43;str
var file &＃61; File(filePath)
if (!file.exists())
//cleanDir(file)
//file.delete()
file.mkdirs()

var filepdf &＃61; File(file, str&＃43;".pdf")
try
val os &＃61; FileOutputStream(filepdf)
os.flush()
//强制文件系统刷新
os.getFD().sync()
return os
catch (e: FileNotFoundException)
e.printStackTrace()

return null

fun cleanDir(f: File)
val listf &＃61; f.listFiles()
for (index in 0 until listf.size)
listf[index].delete()




以上PDF中文字插入及图片加载功能基本实现