[英]how to create pdf file with multiple pages from image file in android
如何從Android中的圖像文件創建多頁PDF文件? 我從圖像創建了一個 PDF 文件。 該 PDF 文件只有一頁。 那是那幅畫的一半。 在右側搜索部分被剪切成 PDF 文件。 我正在使用 itext-5.3.4.jar 來創建 PDF。
wbviewnews.loadUrl("http://developer.android.com/about/index.html");
// button for create wbpage to image than image to PDF file
Button btnclick =(Button)findViewById(R.id.btnclick);
btnclick.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Picture p = wbviewnews.capturePicture();
bitmap=null;
PictureDrawable pictureDrawable = new PictureDrawable(p);
bitmap = Bitmap.createBitmap(pictureDrawable.getIntrinsicWidth(),pictureDrawable.getIntrinsicHeight(), Config.ARGB_8888);
//Bitmap bitmap = Bitmap.createBitmap(200,200, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.drawPicture(pictureDrawable.getPicture());
ImageView imgdata=(ImageView)findViewById(R.id.imgdata);
imgdata.setImageBitmap(bitmap);
String filename = "pippo.png";
File sd = Environment.getExternalStorageDirectory();
File dest = new File(sd, filename);
String pdffilename = "pippo.pdf";
File pdffilepath = new File(sd, pdffilename);
try {
FileOutputStream out = new FileOutputStream(dest);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
Log.e("Exception", e.toString());
}
Document document=new Document();
try {
Log.e("pdffilepath", pdffilepath.toString());
PdfWriter writer = PdfWriter.getInstance(document,new FileOutputStream(pdffilepath));
document.open();
// URL url = new URL (Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+filename);
// Log.e("url", url.toString());
Image image = Image.getInstance(Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+filename) ;
document.add(image);
document.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("FileNotFoundException", e.toString());
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("DocumentException", e.toString());
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("MalformedURLException", e.toString());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("IOException", e.toString());
}
}
});
我猜你通過 StackOverflow 的搜索較少,因為我發現這些答案已經有解決方案,是的,它包含在不同的答案中,看看 Q/AI 猜測它們可以解決你的問題,如果沒有,那就繼續嘗試:)
如果您的線性布局高度非常大,請嘗試使用此代碼
https://demonuts.com/android-generate-pdf-view/
按照此鏈接,只需更改行
PdfDocument document = new PdfDocument();
PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(convertWidth, 10000, 1).create();
PdfDocument.Page page = document.startPage(pageInfo);
Canvas canvas = page.getCanvas();
Paint paint = new Paint();
paint.setColor(Color.BLUE);
canvas.drawPaint(paint);
Bitmap bitmap = Bitmap.createScaledBitmap(bitmap, convertWidth, 10000, true);
canvas.drawBitmap(bitmap, 0, 0 , null);
document.finishPage(page);`
如果要創建包含多個圖像的 pdf 文件,可以使用 Android 中的PdfDocument 。 這是一個演示:
private void createPDFWithMultipleImage(){
File file = getOutputFile();
if (file != null){
try {
FileOutputStream fileOutputStream = new FileOutputStream(file);
PdfDocument pdfDocument = new PdfDocument();
for (int i = 0; i < images.size(); i++){
Bitmap bitmap = BitmapFactory.decodeFile(images.get(i).getPath());
PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(bitmap.getWidth(), bitmap.getHeight(), (i + 1)).create();
PdfDocument.Page page = pdfDocument.startPage(pageInfo);
Canvas canvas = page.getCanvas();
Paint paint = new Paint();
paint.setColor(Color.BLUE);
canvas.drawPaint(paint);
canvas.drawBitmap(bitmap, 0f, 0f, null);
pdfDocument.finishPage(page);
bitmap.recycle();
}
pdfDocument.writeTo(fileOutputStream);
pdfDocument.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private File getOutputFile(){
File root = new File(this.getExternalFilesDir(null),"My PDF Folder");
boolean isFolderCreated = true;
if (!root.exists()){
isFolderCreated = root.mkdir();
}
if (isFolderCreated) {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(new Date());
String imageFileName = "PDF_" + timeStamp;
return new File(root, imageFileName + ".pdf");
}
else {
Toast.makeText(this, "Folder is not created", Toast.LENGTH_SHORT).show();
return null;
}
}
這里的圖像是帶有路徑的圖像的 ArrayList。
你可以像這樣設置圖像...
Bitmap bt=Bitmap.createScaledBitmap(btm, 200, 200, false);
bt.compress(Bitmap.CompressFormat.PNG,100, bos);
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