NoClassDefFoundError when inserting image in Andro

问题:

I want to insert a PNG image into my Excel sheet using Apache poi.

To do that I use this code:

//add picture data to this workbook.
InputStream is = new FileInputStream("/sdcard/MYAPPFOLDER/logo_app.png");
byte[] bytes = IOUtils.toByteArray(is);
int pictureIdx = workbook.addPicture(bytes, Workbook.PICTURE_TYPE_JPEG);
is.close();

CreationHelper helper = workbook.getCreationHelper();

// Create the drawing patriarch.  This is the top level container for all shapes. 
Drawing drawing = sheet.createDrawingPatriarch();

//add a picture shape
ClientAnchor anchor = helper.createClientAnchor();
//set top-left corner of the picture,
//subsequent call of Picture#resize() will operate relative to it
anchor.setCol1(0);
anchor.setRow1(0);
Picture pict = drawing.createPicture(anchor, pictureIdx);

//auto-size picture relative to its top-left corner
pict.resize();

But in first time I have one error which I have solved by adding this library commons-codec-1.8.jar and now I have this error:

02-21 10:10:51.466: E/AndroidRuntime(31691): FATAL EXCEPTION: main
02-21 10:10:51.466: E/AndroidRuntime(31691): java.lang.NoClassDefFoundError: java.awt.Dimension
02-21 10:10:51.466: E/AndroidRuntime(31691):    at org.apache.poi.ss.util.ImageUtils.getImageDimension(ImageUtils.java:52)
02-21 10:10:51.466: E/AndroidRuntime(31691):    at org.apache.poi.hssf.usermodel.HSSFPicture.getImageDimension(HSSFPicture.java:243)
02-21 10:10:51.466: E/AndroidRuntime(31691):    at org.apache.poi.hssf.usermodel.HSSFPicture.getPreferredSize(HSSFPicture.java:163)

Which points to this line:

pict.resize();

How can I fix it?

回答1:

You can't use pure Java libraries that involve graphics routines (java.awt), because Android hasn't implemented them, as it uses it's own graphics library. Bottom line is, you can't use the library you want with Android, although I'm sure there's other ways to do the task you want to do.

Android uses a few base types, namely Views, Canvas, and Drawables. Take a look at those, and see if they meet your needs.

回答2:

you cannot use java.awt.* package in Android, use the Android UI elements instead. See related question here