閱讀PDF時出現OutOfMemoryError（Android）

Question

我有一個〜5 MB的文件，我想用IText來閱讀。我的目標是將此PDF中的許多頁面疊加到另一PDF上。

這是我的代碼：

try {    
    AssetManager assetManager = getActivity().getAssets(); 
    InputStream istr = null; 
    PdfReader reader = null; 
    istr =(InputStream) assetManager.open("chem.pdf"); 
    reader=new PdfReader(istr); 
    Document document = new Document(); 
    PdfWriter writer= PdfWriter.getInstance(document, new FileOutputStream(Environment.getExternalStorageDirectory()+ "/pdfpdfpdfpdfpdf.pdf")); 
    document.open(); 
    document.add(new Paragraph("               Generated By Harshvardhan Gupta")); 
    document.newPage(); 
    PdfContentByte canvas = writer.getDirectContent(); 
    PdfImportedPage page; 
    //Rectangle r=document.getPageSize(); 
    float pos=720; 
    float CurPsize=0; 
    float counter=0; 
    float oldc=0; 
    //r.getBottom(); 
    for(int m=1;m<35;m++,counter++) { 
     page = writer.getImportedPage(reader, m); 
     Rectangle r=reader.getPageSize(m); 
     CurPsize= (r.getTop()-r.getBottom()); 
     pos=pos-CurPsize; 
     Rectangle q=reader.getPageSize(m+1); 
     int mq=(int) (q.getTop()-q.getBottom()); 
     if(pos<mq+counter*25+50){ 
      document.newPage(); 
      pos=720; 
      counter=0; 
     } 
     canvas.setTextRenderingMode(PdfContentByte.TEXT_RENDER_MODE_FILL); 
     canvas.addTemplate(page, 1f, 0, 0, 1,100,pos-70-counter*25); 
     BaseFont bf= BaseFont.createFont(); 
     canvas.setTextRenderingMode(PdfContentByte.TEXT_RENDER_MODE_FILL_STROKE); 
     canvas.beginText(); 
     canvas.setFontAndSize(bf,14); 
     canvas.setTextMatrix(75, (float) ((float) (pos-70-counter*25)-10+CurPsize)); 
     canvas.setLineWidth(0.5f); 
     canvas.showText(m+"."+" "); 
     canvas.endText(); 
    } 
    document.close(); 
    writer.freeReader(reader); 
    writer.close(); 
    reader.close(); 
    //spinner.setVisibility(View.INVISIBLE); 
    Log.d("OK", "done"); 
} catch (FileNotFoundException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
} catch (IOException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
} catch (DocumentException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
} 
//spinner.setVisibility(View.INVISIBLE); 

有東西要去一個公平的數額，但我認爲從資產閱讀PDF甚至在一個OutOfMemoryError被拋出。

這是完全錯誤日誌：

06-21 19:39:12.090: E/AndroidRuntime(6844): FATAL EXCEPTION: main 
06-21 19:39:12.090: E/AndroidRuntime(6844): java.lang.OutOfMemoryError 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at java.io.ByteArrayOutputStream.expand(ByteArrayOutputStream.java:91) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:201) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.FlateDecode(PdfReader.java:2004) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.FlateDecode(PdfReader.java:1859) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.FilterHandlers$Filter_FLATEDECODE.decode(FilterHandlers.java:107) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.decodeBytes(PdfReader.java:2409) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.decodeBytes(PdfReader.java:2357) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.getStreamBytes(PdfReader.java:2422) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.readObjStm(PdfReader.java:1363) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.readDocObj(PdfReader.java:1305) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.readPdf(PdfReader.java:649) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:187) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:328) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:349) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.mainpackage.FragmentOne$1.onClick(FragmentOne.java:88) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at android.view.View.performClick(View.java:3511) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at android.view.View$PerformClick.run(View.java:14105) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at android.os.Handler.handleCallback(Handler.java:605) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at android.os.Handler.dispatchMessage(Handler.java:92) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at android.os.Looper.loop(Looper.java:137) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at java.lang.reflect.Method.invoke(Method.java:511) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:592) 
06-21 19:39:12.090: E/AndroidRuntime(6844):  at dalvik.system.NativeStart.main(Native Method) 

請注意，我用一個更小的文件（200KB）試圖和它的作品。這是否意味着我無法使用iText在Android上閱讀這樣一個大文件？

Answer 1

我的pdf有很多使用鋼筆工具的註釋。這是造成這個問題的原因。 我刪除了筆標記，PDF加載正常。