你好，朋友们好吗.....我在这里是因为我想从 android listview 创建多页 pdf 我已经成功地将所有 listview 项目转换为 pdf，即使它们不是全部使用 itextg 可见的，我面临的问题是如果列表视图中的项目或列表视图的捕获图像超过了 pdf 中页面的长度，它会剪切其余的项目......所以我想要的是创建一个多页 pdf 如果第一页已满然后在第二幅图像中写入图像的其余部分......我希望我能尽快做出响应............这些是通过捕获所有列表视图项来创建 pdf 的代码...... .
//method wich generate pdf of the attendance data
private void save_as_pdf() {
//First Check if the external storage is writable
String state = Environment.getExternalStorageState();
if (!Environment.MEDIA_MOUNTED.equals(state)) {
// Toast.makeText(context,"")
}
//Create a directory for your PDF
final File pdfDir = new File(Environment.getExternalStorageDirectory() + "/Documents", "attendance_report");
if (!pdfDir.exists()) {
pdfDir.mkdir();
}
//take screen shoot of the entire listview of the attendance report
ListView listview = studentlist;
ListAdapter adapter = listview.getAdapter();
int itemscount = adapter.getCount();
int allitemsheight = 0;
List<Bitmap> bmps = new ArrayList<Bitmap>();
for (int i = 0; i < itemscount; i++) {
View childView = adapter.getView(i, null, listview);
childView.measure(
View.MeasureSpec.makeMeasureSpec(listview.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());
childView.setDrawingCacheEnabled(true);
childView.buildDrawingCache();
bmps.add(childView.getDrawingCache());
allitemsheight += childView.getMeasuredHeight();
}
Bitmap bigbitmap = Bitmap.createBitmap(listview.getMeasuredWidth(), allitemsheight,
Bitmap.Config.ARGB_8888);
Canvas bigcanvas = new Canvas(bigbitmap);
bigcanvas.drawColor(getResources().getColor(R.color.white));
Paint paint = new Paint();
int iHeight = 0;
for (int i = 0; i < bmps.size(); i++) {
Bitmap bmp = bmps.get(i);
bigcanvas.drawBitmap(bmp, 0, iHeight, paint);
iHeight += bmp.getHeight();
bmp.recycle();
bmp = null;
}
//Now create the name of your PDF file that you will generate
File pdfFile = new File(pdfDir, "report_for( " + course + "," + semister + section + "," + date + ").pdf");
try {
com.itextpdf.text.Document document = new com.itextpdf.text.Document();
PdfWriter.getInstance(document, new FileOutputStream(pdfFile));
document.addTitle("Attendance Report Generated For course:" + course + " Semester:" + semister + " Section:" + section + " Date:" + date);
document.addHeader("Header", "Department Of Information Science");
document.addCreator("Department Of Information Science");
document.addCreationDate();
document.bottomMargin();
document.setPageCount(3);
document.open();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bigbitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
addImage(document, byteArray);
document.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private void addImage(com.itextpdf.text.Document document, byte[] byteArray) {
Image image = null;
try {
image = Image.getInstance(byteArray);
} catch (BadElementException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// image.scaleAbsolute(150f, 150f);
try {
document.add(image);
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}