Android 打印带有页面范围的 pdf 时，后台处理程序因 SIGSEGV 而崩溃
Android spooler crashes with SIGSEV while printing pdf with a page range
当我尝试打印一个 16 页的 PDF 文档时，仅选择了某些页面（即页面范围），后台处理程序因 SIGSEV 而崩溃（请参阅下面的转储）。当我尝试 'print' 到 PDF 时，也会发生同样的崩溃。打印文档的所有页面都很好。
这是 android 打印框架中的错误吗？
尝试仅打印 16 页中的第一页时的转储：
05-16 11:51:16.828 6058-6069/? I/PdfManipulationService -> PdfRenderer: closeDocument()
05-16 11:51:16.838 11898-11898/? I/MutexFileProvider: Released file: /data/user/0/com.android.printspooler/files/print_job_1fc0a791-435d-493c-8cff-7ff65c3a642e.pdf from thread: Thread[main,5,main]
05-16 11:51:16.838 11898-12249/? I/MutexFileProvider: Acquired file: /data/user/0/com.android.printspooler/files/print_job_1fc0a791-435d-493c-8cff-7ff65c3a642e.pdf by thread: Thread[AsyncTask #6,5,main]
05-16 11:51:16.838 6058-6068/? I/PdfManipulationService -> PdfEditor: openDocument()
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: removePages()
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 15/16
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 14/15
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 13/14
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 12/13
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 11/12
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 10/11
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 9/10
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 8/9
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 7/8
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 6/7
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 5/6
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 4/5
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 3/4
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 2/3
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 1/2
05-16 11:51:16.848 6058-6495/? I/PdfManipulationService -> PdfEditor: write()
05-16 11:51:17.018 6058-6495/? A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x8 in tid 6495 (Binder_4)
05-16 11:51:17.088 3144-3144/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
05-16 11:51:17.088 3144-3144/? A/DEBUG: Build fingerprint: 'samsung/heroltebmc/heroltebmc:6.0.1/MMB29K/G930W8VLU2APK3:user/release-keys'
05-16 11:51:17.088 3144-3144/? A/DEBUG: Revision: '8'
05-16 11:51:17.088 3144-3144/? A/DEBUG: ABI: 'arm64'
05-16 11:51:17.088 3144-3144/? A/DEBUG: pid: 6058, tid: 6495, name: Binder_4 >>> com.android.printspooler:renderer <<<
05-16 11:51:17.088 3144-3144/? A/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x8
05-16 11:51:17.098 3144-3144/? A/DEBUG: x0 0000000000000000 x1 0000007f7d61e700 x2 0000000000000621 x3 0000000000000000
05-16 11:51:17.098 3144-3144/? A/DEBUG: x4 0000000000000000 x5 0000007f5b03f2c8 x6 0000007f5b03f2bc x7 ffffffffffffffff
05-16 11:51:17.108 3144-3144/? A/DEBUG: x8 0000000000000000 x9 0000007f81195000 x10 0000007f81195610 x11 0000000000000018
05-16 11:51:17.108 3144-3144/? A/DEBUG: x12 0000000000000000 x13 ffffffffff000000 x14 0000000000000000 x15 0000000000000000
05-16 11:51:17.108 3144-3144/? A/DEBUG: x16 0000007f8134deb0 x17 0000007f80fb3174 x18 00000000ffffffff x19 0000000000000000
05-16 11:51:17.108 3144-3144/? A/DEBUG: x20 0000000000000000 x21 0000007f5b03f2bc x22 0000000000000621 x23 0000007f5b03f2c8
05-16 11:51:17.108 3144-3144/? A/DEBUG: x24 0000007f7d61e700 x25 0000000000000000 x26 0000000000000000 x27 0000000000000000
05-16 11:51:17.108 3144-3144/? A/DEBUG: x28 0000000000000000 x29 0000007f5b03f170 x30 0000007f80fe50b4
05-16 11:51:17.108 3144-3144/? A/DEBUG: sp 0000007f5b03f150 pc 0000007f80fb3174 pstate 0000000060000000
05-16 11:51:17.108 3144-3144/? A/DEBUG: backtrace:
05-16 11:51:17.108 3144-3144/? A/DEBUG: #00 pc 00000000000b9174 /system/lib64/libpdfium.so (_ZN14CPDF_ModuleMgr14GetFlateModuleEv)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #01 pc 00000000000eb0b0 /system/lib64/libpdfium.so (_Z24FPDFAPI_FlateOrLZWDecodeiPKhjP15CPDF_DictionaryjRPhRj+364)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #02 pc 00000000000eb440 /system/lib64/libpdfium.so (_Z14PDF_DataDecodePKhjPK15CPDF_DictionaryRPhRjR14CFX_ByteStringRPS1_ji+844)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #03 pc 00000000000f3980 /system/lib64/libpdfium.so (_ZN14CPDF_StreamAcc11LoadAllDataEPK11CPDF_Streamiji+436)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #04 pc 00000000000f621c /system/lib64/libpdfium.so (_ZN11CPDF_Parser15GetObjectStreamEj+156)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #05 pc 00000000000f7a20 /system/lib64/libpdfium.so (_ZN11CPDF_Parser17GetIndirectBinaryEjRPhRj+244)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #06 pc 00000000000be7ec /system/lib64/libpdfium.so (_ZN12CPDF_Creator22WriteOldIndirectObjectEj+500)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #07 pc 00000000000beb04 /system/lib64/libpdfium.so (_ZN12CPDF_Creator12WriteOldObjsEP9IFX_Pause+84)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #08 pc 00000000000c015c /system/lib64/libpdfium.so (_ZN12CPDF_Creator15WriteDoc_Stage2EP9IFX_Pause+136)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #09 pc 00000000000c1f90 /system/lib64/libpdfium.so (_ZN12CPDF_Creator8ContinueEP9IFX_Pause+172)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #10 pc 00000000000c2598 /system/lib64/libpdfium.so (_ZN12CPDF_Creator6CreateEj+288)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #11 pc 000000000008dfd0 /system/lib64/libpdfium.so (_Z14_FPDF_Doc_SavePvP15FPDF_FILEWRITE_mii+120)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #12 pc 000000000010891c /system/lib64/libandroid_runtime.so
05-16 11:51:17.108 3144-3144/? A/DEBUG: #13 pc 0000000003314208 /system/framework/arm64/boot.oat (offset 0x2f5b000)
05-16 11:51:17.288 3144-3144/? A/DEBUG: Tombstone written to: /data/tombstones/tombstone_06
05-16 11:51:17.288 3144-3144/? E/DEBUG: AM write failed: Broken pipe
[ 05-16 11:51:17.288 3144: 3144 E/ ]
ro.product_ship = true
[ 05-16 11:51:17.288 3144: 3144 E/ ]
ro.debug_level = 0x4f4c
[ 05-16 11:51:17.288 3144: 3144 E/ ]
sys.mobilecare.preload = false
05-16 11:51:17.288 5284-5284/? E/audit: type=1701 msg=audit(1494944477.288:292): auid=4294967295 uid=99011 gid=99011 ses=4294967295 subj=u:r:isolated_app:s0:c512,c768 pid=6495 comm="Binder_4" exe="/system/bin/app_process64" sig=11
05-16 11:51:17.288 3480-3588/? I/BootReceiver: Copying /data/tombstones/tombstone_06 to DropBox (SYSTEM_TOMBSTONE)
05-16 11:51:17.298 3480-3572/? W/ResourcesManager: getTopLevelResources: /system/app/SPrintSpooler6/SPrintSpooler6.apk / 1.0 running in null rsrc of package com.android.printspooler
05-16 11:51:17.328 3167-3167/? I/Zygote: Process 6058 exited due to signal (11)
05-16 11:51:17.328 11898-12249/? E/PrintActivity: Error dropping pages
android.os.DeadObjectException
at android.os.BinderProxy.transactNative(Native Method)
at android.os.BinderProxy.transact(Binder.java:503)
at com.android.printspooler.renderer.IPdfEditor$Stub$Proxy.write(IPdfEditor.java:198)
at com.android.printspooler.ui.PrintActivity$DocumentTransformer.doTransform(PrintActivity.java:3052)
at com.android.printspooler.ui.PrintActivity$DocumentTransformer.access00(PrintActivity.java:2947)
at com.android.printspooler.ui.PrintActivity$DocumentTransformer.doInBackground(PrintActivity.java:2998)
at com.android.printspooler.ui.PrintActivity$DocumentTransformer.doInBackground(PrintActivity.java:2991)
at android.os.AsyncTask.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
很难说清楚为什么会发生这种情况，post 只是崩溃而没有导致崩溃的代码（SIGSEV 意味着无效的内存引用导致崩溃）并不是太聪明。 .. 因此我只能提供一个例子，但不能说出是什么导致了无效的引用。
PrintManager printManager = (PrintManager) this.getSystemService(Context.PRINT_SERVICE);
String jobName = this.getString(R.string.app_name) + " Document";
printManager.print(jobName, pda, null);
PrintDocumentAdapter pda = new PrintDocumentAdapter(){
@Override
public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback){
InputStream input = null;
OutputStream output = null;
try {
input = new FileInputStream(file to print);
output = new FileOutputStream(destination.getFileDescriptor());
byte[] buf = new byte[1024];
int bytesRead;
while ((bytesRead = input.read(buf)) > 0) {
output.write(buf, 0, bytesRead);
}
callback.onWriteFinished(new PageRange[]{PageRange.ALL_PAGES});
} catch (FileNotFoundException ee){
} catch (Exception e) {
} finally {
try {
input.close();
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras){
if (cancellationSignal.isCanceled()) {
callback.onLayoutCancelled();
return;
}
PrintDocumentInfo pdi = new PrintDocumentInfo.Builder("Name of file").setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build();
callback.onLayoutFinished(pdi, true);
}
};
Android 的最新更新解决了这个问题。我实际上遇到了错误修复参考，但目前没有 link。
当我尝试打印一个 16 页的 PDF 文档时，仅选择了某些页面（即页面范围），后台处理程序因 SIGSEV 而崩溃（请参阅下面的转储）。当我尝试 'print' 到 PDF 时，也会发生同样的崩溃。打印文档的所有页面都很好。
这是 android 打印框架中的错误吗？
尝试仅打印 16 页中的第一页时的转储：
05-16 11:51:16.828 6058-6069/? I/PdfManipulationService -> PdfRenderer: closeDocument()
05-16 11:51:16.838 11898-11898/? I/MutexFileProvider: Released file: /data/user/0/com.android.printspooler/files/print_job_1fc0a791-435d-493c-8cff-7ff65c3a642e.pdf from thread: Thread[main,5,main]
05-16 11:51:16.838 11898-12249/? I/MutexFileProvider: Acquired file: /data/user/0/com.android.printspooler/files/print_job_1fc0a791-435d-493c-8cff-7ff65c3a642e.pdf by thread: Thread[AsyncTask #6,5,main]
05-16 11:51:16.838 6058-6068/? I/PdfManipulationService -> PdfEditor: openDocument()
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: removePages()
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 15/16
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 14/15
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 13/14
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 12/13
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 11/12
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 10/11
05-16 11:51:16.838 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 9/10
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 8/9
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 7/8
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 6/7
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 5/6
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 4/5
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 3/4
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 2/3
05-16 11:51:16.848 6058-6494/? I/PdfManipulationService -> PdfEditor: trying to remove page 1/2
05-16 11:51:16.848 6058-6495/? I/PdfManipulationService -> PdfEditor: write()
05-16 11:51:17.018 6058-6495/? A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x8 in tid 6495 (Binder_4)
05-16 11:51:17.088 3144-3144/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
05-16 11:51:17.088 3144-3144/? A/DEBUG: Build fingerprint: 'samsung/heroltebmc/heroltebmc:6.0.1/MMB29K/G930W8VLU2APK3:user/release-keys'
05-16 11:51:17.088 3144-3144/? A/DEBUG: Revision: '8'
05-16 11:51:17.088 3144-3144/? A/DEBUG: ABI: 'arm64'
05-16 11:51:17.088 3144-3144/? A/DEBUG: pid: 6058, tid: 6495, name: Binder_4 >>> com.android.printspooler:renderer <<<
05-16 11:51:17.088 3144-3144/? A/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x8
05-16 11:51:17.098 3144-3144/? A/DEBUG: x0 0000000000000000 x1 0000007f7d61e700 x2 0000000000000621 x3 0000000000000000
05-16 11:51:17.098 3144-3144/? A/DEBUG: x4 0000000000000000 x5 0000007f5b03f2c8 x6 0000007f5b03f2bc x7 ffffffffffffffff
05-16 11:51:17.108 3144-3144/? A/DEBUG: x8 0000000000000000 x9 0000007f81195000 x10 0000007f81195610 x11 0000000000000018
05-16 11:51:17.108 3144-3144/? A/DEBUG: x12 0000000000000000 x13 ffffffffff000000 x14 0000000000000000 x15 0000000000000000
05-16 11:51:17.108 3144-3144/? A/DEBUG: x16 0000007f8134deb0 x17 0000007f80fb3174 x18 00000000ffffffff x19 0000000000000000
05-16 11:51:17.108 3144-3144/? A/DEBUG: x20 0000000000000000 x21 0000007f5b03f2bc x22 0000000000000621 x23 0000007f5b03f2c8
05-16 11:51:17.108 3144-3144/? A/DEBUG: x24 0000007f7d61e700 x25 0000000000000000 x26 0000000000000000 x27 0000000000000000
05-16 11:51:17.108 3144-3144/? A/DEBUG: x28 0000000000000000 x29 0000007f5b03f170 x30 0000007f80fe50b4
05-16 11:51:17.108 3144-3144/? A/DEBUG: sp 0000007f5b03f150 pc 0000007f80fb3174 pstate 0000000060000000
05-16 11:51:17.108 3144-3144/? A/DEBUG: backtrace:
05-16 11:51:17.108 3144-3144/? A/DEBUG: #00 pc 00000000000b9174 /system/lib64/libpdfium.so (_ZN14CPDF_ModuleMgr14GetFlateModuleEv)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #01 pc 00000000000eb0b0 /system/lib64/libpdfium.so (_Z24FPDFAPI_FlateOrLZWDecodeiPKhjP15CPDF_DictionaryjRPhRj+364)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #02 pc 00000000000eb440 /system/lib64/libpdfium.so (_Z14PDF_DataDecodePKhjPK15CPDF_DictionaryRPhRjR14CFX_ByteStringRPS1_ji+844)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #03 pc 00000000000f3980 /system/lib64/libpdfium.so (_ZN14CPDF_StreamAcc11LoadAllDataEPK11CPDF_Streamiji+436)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #04 pc 00000000000f621c /system/lib64/libpdfium.so (_ZN11CPDF_Parser15GetObjectStreamEj+156)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #05 pc 00000000000f7a20 /system/lib64/libpdfium.so (_ZN11CPDF_Parser17GetIndirectBinaryEjRPhRj+244)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #06 pc 00000000000be7ec /system/lib64/libpdfium.so (_ZN12CPDF_Creator22WriteOldIndirectObjectEj+500)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #07 pc 00000000000beb04 /system/lib64/libpdfium.so (_ZN12CPDF_Creator12WriteOldObjsEP9IFX_Pause+84)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #08 pc 00000000000c015c /system/lib64/libpdfium.so (_ZN12CPDF_Creator15WriteDoc_Stage2EP9IFX_Pause+136)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #09 pc 00000000000c1f90 /system/lib64/libpdfium.so (_ZN12CPDF_Creator8ContinueEP9IFX_Pause+172)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #10 pc 00000000000c2598 /system/lib64/libpdfium.so (_ZN12CPDF_Creator6CreateEj+288)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #11 pc 000000000008dfd0 /system/lib64/libpdfium.so (_Z14_FPDF_Doc_SavePvP15FPDF_FILEWRITE_mii+120)
05-16 11:51:17.108 3144-3144/? A/DEBUG: #12 pc 000000000010891c /system/lib64/libandroid_runtime.so
05-16 11:51:17.108 3144-3144/? A/DEBUG: #13 pc 0000000003314208 /system/framework/arm64/boot.oat (offset 0x2f5b000)
05-16 11:51:17.288 3144-3144/? A/DEBUG: Tombstone written to: /data/tombstones/tombstone_06
05-16 11:51:17.288 3144-3144/? E/DEBUG: AM write failed: Broken pipe
[ 05-16 11:51:17.288 3144: 3144 E/ ]
ro.product_ship = true
[ 05-16 11:51:17.288 3144: 3144 E/ ]
ro.debug_level = 0x4f4c
[ 05-16 11:51:17.288 3144: 3144 E/ ]
sys.mobilecare.preload = false
05-16 11:51:17.288 5284-5284/? E/audit: type=1701 msg=audit(1494944477.288:292): auid=4294967295 uid=99011 gid=99011 ses=4294967295 subj=u:r:isolated_app:s0:c512,c768 pid=6495 comm="Binder_4" exe="/system/bin/app_process64" sig=11
05-16 11:51:17.288 3480-3588/? I/BootReceiver: Copying /data/tombstones/tombstone_06 to DropBox (SYSTEM_TOMBSTONE)
05-16 11:51:17.298 3480-3572/? W/ResourcesManager: getTopLevelResources: /system/app/SPrintSpooler6/SPrintSpooler6.apk / 1.0 running in null rsrc of package com.android.printspooler
05-16 11:51:17.328 3167-3167/? I/Zygote: Process 6058 exited due to signal (11)
05-16 11:51:17.328 11898-12249/? E/PrintActivity: Error dropping pages
android.os.DeadObjectException
at android.os.BinderProxy.transactNative(Native Method)
at android.os.BinderProxy.transact(Binder.java:503)
at com.android.printspooler.renderer.IPdfEditor$Stub$Proxy.write(IPdfEditor.java:198)
at com.android.printspooler.ui.PrintActivity$DocumentTransformer.doTransform(PrintActivity.java:3052)
at com.android.printspooler.ui.PrintActivity$DocumentTransformer.access00(PrintActivity.java:2947)
at com.android.printspooler.ui.PrintActivity$DocumentTransformer.doInBackground(PrintActivity.java:2998)
at com.android.printspooler.ui.PrintActivity$DocumentTransformer.doInBackground(PrintActivity.java:2991)
at android.os.AsyncTask.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
很难说清楚为什么会发生这种情况，post 只是崩溃而没有导致崩溃的代码（SIGSEV 意味着无效的内存引用导致崩溃）并不是太聪明。 .. 因此我只能提供一个例子，但不能说出是什么导致了无效的引用。
PrintManager printManager = (PrintManager) this.getSystemService(Context.PRINT_SERVICE);
String jobName = this.getString(R.string.app_name) + " Document";
printManager.print(jobName, pda, null);
PrintDocumentAdapter pda = new PrintDocumentAdapter(){
@Override
public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback){
InputStream input = null;
OutputStream output = null;
try {
input = new FileInputStream(file to print);
output = new FileOutputStream(destination.getFileDescriptor());
byte[] buf = new byte[1024];
int bytesRead;
while ((bytesRead = input.read(buf)) > 0) {
output.write(buf, 0, bytesRead);
}
callback.onWriteFinished(new PageRange[]{PageRange.ALL_PAGES});
} catch (FileNotFoundException ee){
} catch (Exception e) {
} finally {
try {
input.close();
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras){
if (cancellationSignal.isCanceled()) {
callback.onLayoutCancelled();
return;
}
PrintDocumentInfo pdi = new PrintDocumentInfo.Builder("Name of file").setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build();
callback.onLayoutFinished(pdi, true);
}
};
Android 的最新更新解决了这个问题。我实际上遇到了错误修复参考，但目前没有 link。