我正在尝试在我的应用程序中创建一个pdf文件,将其保存在打开它的外部存储器上.保存文件对我来说不是问题,也不是打开文件,我的问题是创建文件并写入文件.所以在网上进行一些研究后,我发现了以下方法：
@H_301_2@File file = new File(directoryName,fileName);
// Creating output stream to write in the newly created file
FileOutputStream fOut = null;
try {
fOut = new FileOutputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// Creating a new document
Document document = new Document(PageSize.A4,50,50);
try {
PdfWriter.getInstance(document,fOut);
// Open the document for writing
document.open();
// Write in the document
document.add(new Paragraph("Hello world"));
document.close();
} catch(DocumentException de) {
System.err.println(de.getMessage());
}
@H_301_2@java.lang.NoClassDefFoundError: Failed resolution of: Ljava/awt/Color;
有人会知道我的代码有什么问题,或者其他确保用于创建和编写pdf文件的方法有什么问题？
谢谢 ！
解决方法
显然我使用的代码与android不兼容,因此我得到了错误.您可以在下面找到实际正常工作的正确代码(用于创建pdf文件,在其中放入一些内容,保存并打开新创建的文件)：
@H_301_2@// Method for creating a pdf file from text,saving it then opening it for display
public void createandDisplayPdf(String text) {
Document doc = new Document();
try {
String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Dir";
File dir = new File(path);
if(!dir.exists())
dir.mkdirs();
File file = new File(dir,"newFile.pdf");
FileOutputStream fOut = new FileOutputStream(file);
PdfWriter.getInstance(doc,fOut);
//open the document
doc.open();
Paragraph p1 = new Paragraph(text);
Font paraFont= new Font(Font.COURIER);
p1.setAlignment(Paragraph.ALIGN_CENTER);
p1.setFont(paraFont);
//add paragraph to document
doc.add(p1);
} catch (DocumentException de) {
Log.e("PDFCreator","DocumentException:" + de);
} catch (IOException e) {
Log.e("PDFCreator","ioException:" + e);
}
finally {
doc.close();
}
viewPdf("newFile.pdf","Dir");
}
// Method for opening a pdf file
private void viewPdf(String file,String directory) {
File pdfFile = new File(Environment.getExternalStorageDirectory() + "/" + directory + "/" + file);
Uri path = Uri.fromFile(pdfFile);
// Setting the intent for pdf reader
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path,"application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {
startActivity(pdfIntent);
} catch (ActivityNotFoundException e) {
Toast.makeText(TableActivity.this,"Can't read pdf file",Toast.LENGTH_SHORT).show();
}
}
