我创建了一个Android Invoice应用程序。生成的发票是带有嵌套视图的标准Android布局。我正在寻找一个可用于将此视图转换为pdf文档的库。
令我感到惊讶的是,我的搜索中没有直接的选项,或者我最后做的第一件事。或者也许我正在寻找的是不可能的。
请有人帮我指点一个工具,它可以帮助我从Android视图转换或生成PDF。我愿意接受免费且适度的付费选择。或者让我知道,如果我正在寻找的是不可能的。
我创建了一个Android Invoice应用程序。生成的发票是带有嵌套视图的标准Android布局。我正在寻找一个可用于将此视图转换为pdf文档的库。
令我感到惊讶的是,我的搜索中没有直接的选项,或者我最后做的第一件事。或者也许我正在寻找的是不可能的。
请有人帮我指点一个工具,它可以帮助我从Android视图转换或生成PDF。我愿意接受免费且适度的付费选择。或者让我知道,如果我正在寻找的是不可能的。
在您的设备屏幕上:
Bitmap screen;
View v1 = MyView.getRootView();
v1.setDrawingCacheEnabled(true);
screen= Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
如果你有 ScrollView
作为根视图然后:
LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
RelativeLayout root = (RelativeLayout) inflater.inflate(R.layout.activity_main, null); //RelativeLayout is root view of my UI(xml) file.
root.setDrawingCacheEnabled(true);
Bitmap screen= getBitmapFromView(this.getWindow().findViewById(R.id.relativelayout)); // here give id of our root layout (here its my RelativeLayout's id)
这里是 getBitmapFromView()
方法:
public static Bitmap getBitmapFromView(View view) {
//Define a bitmap with the same size as the view
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
//Bind a canvas to it
Canvas canvas = new Canvas(returnedBitmap);
//Get the view's background
Drawable bgDrawable =view.getBackground();
if (bgDrawable!=null)
//has background drawable, then draw it on the canvas
bgDrawable.draw(canvas);
else
//does not have background drawable, then draw white background on the canvas
canvas.drawColor(Color.WHITE);
// draw the view on the canvas
view.draw(canvas);
//return the bitmap
return returnedBitmap;
}
它将显示整个屏幕,包括隐藏在您的内容中 ScrollView
。
现在我们有了位图屏幕,让我们将其保存为pdf(你必须下载 itextpdf-5.3.2.jar 文件并附加在你的项目..)
private static String FILE = "mnt/sdcard/invoice.pdf"; // add permission in your manifest...
try
{
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(FILE));
document.open();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
screen.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
addImage(document,byteArray);
document.close();
}
catch (Exception e)
{
e.printStackTrace();
}
private static void addImage(Document document,byte[] byteArray)
{
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();
}
}
在您的设备屏幕上:
Bitmap screen;
View v1 = MyView.getRootView();
v1.setDrawingCacheEnabled(true);
screen= Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
如果你有 ScrollView
作为根视图然后:
LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
RelativeLayout root = (RelativeLayout) inflater.inflate(R.layout.activity_main, null); //RelativeLayout is root view of my UI(xml) file.
root.setDrawingCacheEnabled(true);
Bitmap screen= getBitmapFromView(this.getWindow().findViewById(R.id.relativelayout)); // here give id of our root layout (here its my RelativeLayout's id)
这里是 getBitmapFromView()
方法:
public static Bitmap getBitmapFromView(View view) {
//Define a bitmap with the same size as the view
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
//Bind a canvas to it
Canvas canvas = new Canvas(returnedBitmap);
//Get the view's background
Drawable bgDrawable =view.getBackground();
if (bgDrawable!=null)
//has background drawable, then draw it on the canvas
bgDrawable.draw(canvas);
else
//does not have background drawable, then draw white background on the canvas
canvas.drawColor(Color.WHITE);
// draw the view on the canvas
view.draw(canvas);
//return the bitmap
return returnedBitmap;
}
它将显示整个屏幕,包括隐藏在您的内容中 ScrollView
。
现在我们有了位图屏幕,让我们将其保存为pdf(你必须下载 itextpdf-5.3.2.jar 文件并附加在你的项目..)
private static String FILE = "mnt/sdcard/invoice.pdf"; // add permission in your manifest...
try
{
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(FILE));
document.open();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
screen.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
addImage(document,byteArray);
document.close();
}
catch (Exception e)
{
e.printStackTrace();
}
private static void addImage(Document document,byte[] byteArray)
{
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();
}
}
您可以使用自定义库,例如 https://github.com/HendrixString/Android-PdfMyXml。我比其他任何方法都更喜欢这个库。只是通过这些。
但还有另一种方法 - 如何将Android视图转换为PDF - 生成包含布局位图的pdf