java - Android itext pdf库OutOfMemoryError

Question

我正在使用 itext 库来创建图像和文本的 pdf。以下代码在四分之三的设备上运行良好，但在第四台设备上我收到 OutOfMemoryException。该代码在 AsyncTask doinbackground 方法内运行，它使用 bimtmap 对象检查每个 jpg 文件(sdcard 中的文件目录)的旋转，测量宽度与高度，并在必要时将 itext Image 对象旋转 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: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:278) at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) at java.util.concurrent.FutureTask.setException(FutureTask.java:124) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) at java.util.concurrent.FutureTask.run(FutureTask.java:137) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) at java.lang.Thread.run(Thread.java:856) Caused by: java.lang.OutOfMemoryError at android.graphics.BitmapFactory.nativeDecodeStream(Native Method) at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:493) at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:299) at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:324) at com.wake.snapshot.CreateDocumentActivity$CreateAndSendPdf.doInBackground(CreateDocumentActivity.java:315) at com.wake.up.your.wealth.snapshot.CreateDocumentActivity$CreateAndSendPdf.doInBackground(CreateDocumentActivity.java:1) at android.os.AsyncTask$2.call(AsyncTask.java:264) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) ... 5 more

Answer 1

由于您只需要位图的大小，请使用 BitmapFactory 和 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 outHeight 和 outWidth 中获得大小