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在我的Android打印類中,有時會在onWrite函數中遇到PageRange的參數爲null,它是一個覆蓋函數,並且該值是從Android框架傳遞的,我想找到它的原因有時是空(不是100%)?這是一個設備問題嗎?有人遇到過嗎?代碼和日誌低於:Android PrintManager PageRange爲null
class PdfFragmentPrintDocumentAdapter extends PrintDocumentAdapter{
public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback) {
........
callback.onWriteFinished(pages);
}
.........
java.lang.IllegalArgumentException: pages cannot be empty
at android.print.PrintManager$PrintDocumentAdapterDelegate$MyWriteResultCallback.onWriteFinished(PrintManager.java:961)
at com.microsoft.pdfviewer.PdfFragmentPrint$PdfFragmentPrintDocumentAdapter$2.run(PdfFragmentPrint.java:265)
at com.microsoft.pdfviewer.PdfFragmentPrint$PdfFragmentPrintDocumentAdapter.implementOnWriteInDedicatedThread(PdfFragmentPrint.java:278)
at com.microsoft.pdfviewer.PdfFragmentPrint$PdfFragmentPrintDocumentAdapter.onWrite(PdfFragmentPrint.java:213)
at android.print.PrintManager$PrintDocumentAdapterDelegate$MyHandler.handleMessage(PrintManager.java:792)
因爲onWrite接受取消信號。 – newszer
有沒有人知道如何處理onWrite取消?我調用onWriteCancelled();但它仍然會執行onWriteFinished()。 – newszer