我试图在我的应用程序中打印 Brother SDK 中的图像。
这是我的代码：
`myPrinterInfo = myPrinter.getPrinterInfo();
myPrinterInfo.printerModel = PrinterInfo.Model.QL_810W;
myPrinterInfo.port = PrinterInfo.Port.NET;
myPrinterInfo.printMode = PrinterInfo.PrintMode.FIT_TO_PAGE;
myPrinterInfo.paperSize = PrinterInfo.PaperSize.CUSTOM;
myPrinterInfo.labelNameIndex = 5;
myPrinterInfo.isAutoCut = false;
myPrinterInfo.isCutAtEnd = false;
myPrinterInfo.orientation = PrinterInfo.Orientation.PORTRAIT;
myPrinterInfo.valign = PrinterInfo.VAlign.TOP;
myPrinterInfo.align = PrinterInfo.Align.LEFT;
myPrinterInfo.halftone = PrinterInfo.Halftone.THRESHOLD;
myPrinterInfo.ipAddress = "192.168.1.146";
myPrinterInfo.thresholdingValue = 127;
myPrinterInfo.pjCarbon = false;
myPrinterInfo.pjDensity = 5;
myPrinterInfo.pjFeedMode = PrinterInfo.PjFeedMode.PJ_FEED_MODE_FIXEDPAGE;
myPrinterInfo.pjPaperKind = PJ_CUT_PAPER;
myPrinterInfo.rollPrinterCase = PrinterInfo.PjRollCase.PJ_ROLLCASE_OFF;
myPrinterInfo.paperPosition = PrinterInfo.Align.CENTER;
myPrinterInfo.numberOfCopies = 1;
我使用 62mmx100mm 纸卷，我收到了这个错误信息：
JNI 检测到应用程序错误：GetStringUTFChars 收到 NULL jstring 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art：调用 GetStringUTFChars 08-10 17:33:18.882 31333-31584/br .com.squarebits.brothertest E/art: from boolean com.brother.ptouch.sdk.JNIWrapper.writeByteInFile(int[], int, java.lang.String, boolean) 08-10 17:33:18.882 31333-31584/ br.com.squarebits.brothertest E/art: "AsyncTask #1" prio=5 tid=10 Runnable 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: | group="main" sCount=0 dsCount=0 obj=0x12c99460 self=0xe9594500 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: | sysTid=31584 nice=10 cgrp=bg_non_interactive sched=0/0 句柄=0xe0b65930 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: | state=R schedstat=(80462688 29252686 258) utm=5 stm=3 core=2 HZ=100 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: | 堆栈=0xe0a63000-0xe0a65000 堆栈大小=1038KB 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/艺术：| 持有互斥锁=“mutator lock”（共享持有）08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art：native:#00 pc 0035adcf /system/lib/libart.so (_ZN3art15DumpNativeStackERNSt3__113basic_ostreamIcNS0_11char_traitsIcEEEEi +126) 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #01 pc 0033bdeb /system/lib/libart.so (_ZNK3art6Thread4DumpERNSt3__113basic_ostreamIcNS1_11char_traitsIcEEEE+138) 08-10 33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #02 pc 0024ef71 /system/lib/libart.so ( 33:18.882 31333-31584/br.com.squarebits.brothertest E/艺术：| 堆栈=0xe0a63000-0xe0a65000 堆栈大小=1038KB 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/艺术：| 持有互斥锁=“mutator lock”（共享持有）08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art：native:#00 pc 0035adcf /system/lib/libart.so (_ZN3art15DumpNativeStackERNSt3__113basic_ostreamIcNS0_11char_traitsIcEEEEi +126) 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #01 pc 0033bdeb /system/lib/libart.so (_ZNK3art6Thread4DumpERNSt3__113basic_ostreamIcNS1_11char_traitsIcEEEE+138) 08-10 33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #02 pc 0024ef71 /system/lib/libart.so ( 33:18.882 31333-31584/br.com.squarebits.brothertest E/艺术：| 堆栈=0xe0a63000-0xe0a65000 堆栈大小=1038KB 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/艺术：| 持有互斥锁=“mutator lock”（共享持有）08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art：native:#00 pc 0035adcf /system/lib/libart.so (_ZN3art15DumpNativeStackERNSt3__113basic_ostreamIcNS0_11char_traitsIcEEEEi +126) 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #01 pc 0033bdeb /system/lib/libart.so (_ZNK3art6Thread4DumpERNSt3__113basic_ostreamIcNS1_11char_traitsIcEEEE+138) 08-10 33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #02 pc 0024ef71 /system/lib/libart.so ( | 堆栈=0xe0a63000-0xe0a65000 堆栈大小=1038KB 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/艺术：| 持有互斥锁=“mutator lock”（共享持有）08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art：native:#00 pc 0035adcf /system/lib/libart.so (_ZN3art15DumpNativeStackERNSt3__113basic_ostreamIcNS0_11char_traitsIcEEEEi +126) 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #01 pc 0033bdeb /system/lib/libart.so (_ZNK3art6Thread4DumpERNSt3__113basic_ostreamIcNS1_11char_traitsIcEEEE+138) 08-10 33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #02 pc 0024ef71 /system/lib/libart.so ( | 堆栈=0xe0a63000-0xe0a65000 堆栈大小=1038KB 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/艺术：| 持有互斥锁=“mutator lock”（共享持有）08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art：native:#00 pc 0035adcf /system/lib/libart.so (_ZN3art15DumpNativeStackERNSt3__113basic_ostreamIcNS0_11char_traitsIcEEEEi +126) 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #01 pc 0033bdeb /system/lib/libart.so (_ZNK3art6Thread4DumpERNSt3__113basic_ostreamIcNS1_11char_traitsIcEEEE+138) 08-10 33:18.882 31333-31584/br.com.squarebits.brothertest E/art: 本机: #02 pc 0024ef71 /system/lib/libart.so (ZN3art9JavaVMExt8JniAbortEPKcS2 +900) 08-10 17:33:18.882 31333-31584/br.com.squarebits.brothertest E/art: native: #03 pc 0024f607 /system/lib/libart.so (_ZN3art9JavaVMExt9JniAbortVEPKcS2_St910__va_list)08-St910_va_list :33:18.882 31333-31584/br.com.squarebits.brothertest E/art: native: #04 pc 000fbe5d /system/lib/libart.so (_ZN3art11ScopedCheck6AbortFEPKcz+28) 08-10 17:33:18.882 31333-31584/ br.com.squarebits.brothertest E/art: native: #05 pc 001003b9 /system/lib/libart.so (_ZN3art11ScopedCheck5CheckERNS_18ScopedObjectAccessEbPKcPNS_12JniValueTypeE.constprop.95+2676) 08-10 17:33:18.883 31333-31584/br.com。 squarebits.brothertest E/art: native: #06 pc 00108cd5 /system/lib/libart.so (_ZN3art8CheckJNI17GetStringUTFCharsEP7_JNIEnvP8_jstringPh+376)
如果有人知道如何解决它，请帮助我:(