Android itext pdf库OutOfMemoryError

Question

我正在使用itext库，以便创建一个图像和文本的pdf。下面的代码在4个设备中有3个可以正常工作，但在第4个设备上，我得到了OutofMemoryException。该代码在AsyncTask doinbackground方法中运行，它使用bimtmap对象检查每个jpg文件（来自sdcard的文件目录）的旋转，测量宽度和高度，并在必要时旋转itext Image对象90度。

        try {

            Document document = new Document();
            PdfWriter.getInstance(document, new FileOutputStream(
                    Environment.getExternalStorageDirectory()
                            + "/doc" + documentID + ".pdf"));
            document.open();
            document.setMargins(0f, 0f, 0f, 0f);
            document.add(new Paragraph(documentNameEt.getText().toString()));
            document.add(new Paragraph(makeUserDeets()));
            Bitmap b = null;
            Image image = null;
            Rectangle r = document.getPageSize();
            for (String d : paths[0]) {
                Log.d("senddataobj", d);
                image = Image.getInstance(d);
                b = BitmapFactory.decodeFile(d);
                if (b.getWidth() > b.getHeight()) {
                    image.setRotationDegrees(90);
                    Log.d(d, "rotating");
                }
                b.recycle();
                image.scaleToFit(r.getWidth(), r.getHeight());
                document.add(image);                
            }

            document.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }

java.lang.runtimeException：在Android.os.asyncTask$3处执行doInBackground（）时发生错误。done(asynctask.java:278)在java.util.concurrent.futureTask$sync.innerSetException(FutureTask.java:273)在java.util.concurrent.futureTask.setException(FutureTask.java:124)在在java.util.concurrent.ThreadPoolExecutor.runworker（ThreadPoolExecutor.java:1076)在java.util.concurrent.ThreadPoolExecutor.javer.run（ThreadPoolExecutor.javer.run（ThreadPoolExecutor.java:569)在java.lang.Thread.run（ThreadPoolExecutor.javer.run（ThreadPoolExecutor.java:856)在java.lang.thread.run（ThreadPoolExecutor.javer.run.java:299)在Android.graphics.bitmapfactory.decodeFile(Bitmapfactory.java:324)在com.wake.snapshot.createdocumentactivity$createandsendpdf.doinbackground(createdocumentactivity.java:315)在com.wake.up.your.wealth.snapshot.createdocumentactivity$createandsendpdf.doinbackground(createdocumentactivity.java:1)在android.os.asynctask$2.在java.util.concurrent.futuretask$sync.innerrun(futuretask.java:305).

Answer 1

由于您只需要位图的大小，请使用BitmapFactory with inJustDecodeBounds选项http://developer.android.com/reference/android/graphics/BitmapFactory.options.html#inJustDecodeBounds...它将返回空位图，但您将在外部和外部具有大小