我已经使用MuPDF lib实现了pdf。我在谷歌搜索了一下我发现MuPDFCore.addInkAnnotation(int page, PointF[][] arcs)会将Ink注释添加到pdf后试图绘制pdf。当我调用addInkAnnotation方法时，它崩溃了。
这是我的示例代码，试图通过它查看Pdf上的注释，但运气不好。
PointF[][] p=new PointF[1][1];
PointF [] points=new PointF[2];
points[0]=new PointF(200, 200);
points[1]=new PointF(200, 200);
PointF [] points2=new PointF[2];
points2[0]=new PointF(200, 200);
points2[1]=new PointF(200, 200);
core.addInkAnnotation(2, p);
其中core是MuPDFCore对象。
错误日志。
02-17 20:22:24.610: W/dalvikvm(25082): JNI WARNING: illegal class name 'android.graphics.PointF' (FindClass)
02-17 20:22:24.610: W/dalvikvm(25082): (should be formed like 'dalvik/system/DexFile')
02-17 20:22:24.610: W/dalvikvm(25082): or '[Ldalvik/system/DexFile;' or '[[B')
02-17 20:22:24.610: I/dalvikvm(25082): "main" prio=5 tid=1 NATIVE
02-17 20:22:24.610: I/dalvikvm(25082): | group="main" sCount=0 dsCount=0 obj=0x411af508 self=0x41194208
02-17 20:22:24.610: I/dalvikvm(25082): | sysTid=25082 nice=0 sched=0/0 cgrp=apps handle=1075171120
02-17 20:22:24.610: I/dalvikvm(25082): | schedstat=( 2908935486 1958496146 7720 ) utm=232 stm=57 core=1
02-17 20:22:24.626: I/dalvikvm(25082): #00 pc 00001260 /system/lib/libcorkscrew.so (unwind_backtrace_thread+27)
02-17 20:22:24.626: I/dalvikvm(25082): #01 pc 0005f944 /system/lib/libdvm.so (dvmDumpNativeStack(DebugOutputTarget const*, int)+35)
02-17 20:22:24.626: I/dalvikvm(25082): #02 pc 000537ec /system/lib/libdvm.so (dvmDumpThreadEx(DebugOutputTarget const*, Thread*, bool)+303)
02-17 20:22:24.626: I/dalvikvm(25082): #03 pc 00053886 /system/lib/libdvm.so (dvmDumpThread(Thread*, bool)+25)
02-17 20:22:24.626: I/dalvikvm(25082): #04 pc 00038e42 /system/lib/libdvm.so
02-17 20:22:24.626: I/dalvikvm(25082): #05 pc 00041b3e /system/lib/libdvm.so
02-17 20:22:24.626: I/dalvikvm(25082): #06 pc 000252f4 /data/data/com.example.pdf/lib/libmupdf.so (Java_com_artifex_mupdfdemo_MuPDFCore_addInkAnnotationInternal+355)
02-17 20:22:24.626: I/dalvikvm(25082): #07 pc 0001deb0 /system/lib/libdvm.so (dvmPlatformInvoke+112)
02-17 20:22:24.626: I/dalvikvm(25082): #08 pc 0004d102 /system/lib/libdvm.so (dvmCallJNIMethod(unsigned int const*, JValue*, Method const*, Thread*)+393)
02-17 20:22:24.626: I/dalvikvm(25082): #09 pc 0004f21c /system/lib/libdvm.so (dvmResolveNativeMethod(unsigned int const*, JValue*, Method const*, Thread*)+171)
02-17 20:22:24.626: I/dalvikvm(25082): #10 pc 000272e0 /system/lib/libdvm.so
02-17 20:22:24.626: I/dalvikvm(25082): #11 pc 0002bbe8 /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+180)
02-17 20:22:24.626: I/dalvikvm(25082): #12 pc 0005fb36 /system/lib/libdvm.so (dvmInvokeMethod(Object*, Method const*, ArrayObject*, ArrayObject*, ClassObject*, bool)+373)
02-17 20:22:24.626: I/dalvikvm(25082): #13 pc 000670e4 /system/lib/libdvm.so
02-17 20:22:24.626: I/dalvikvm(25082): #14 pc 000272e0 /system/lib/libdvm.so
02-17 20:22:24.626: I/dalvikvm(25082): #15 pc 0002bbe8 /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+180)
02-17 20:22:24.626: I/dalvikvm(25082): #16 pc 0005f870 /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+271)
02-17 20:22:24.626: I/dalvikvm(25082): #17 pc 000496f2 /system/lib/libdvm.so
02-17 20:22:24.626: I/dalvikvm(25082): #18 pc 0004857e /system/lib/libandroid_runtime.so
02-17 20:22:24.626: I/dalvikvm(25082): #19 pc 00049696 /system/lib/libandroid_runtime.so (android::AndroidRuntime::start(char const*, char const*)+389)
02-17 20:22:24.626: I/dalvikvm(25082): #20 pc 00000dce /system/bin/app_process
02-17 20:22:24.626: I/dalvikvm(25082): #21 pc 00017040 /system/lib/libc.so (__libc_init+35)
02-17 20:22:24.626: I/dalvikvm(25082): at com.artifex.mupdfdemo.MuPDFCore.addInkAnnotationInternal(Native Method)
02-17 20:22:24.626: I/dalvikvm(25082): at com.artifex.mupdfdemo.MuPDFCore.addInkAnnotation(MuPDFCore.java:296)
最佳答案
我认为应该是：
PointF[][] p=new PointF[2][];
PointF [] points=new PointF[2];
points[0]=new PointF(200, 200);
points[1]=new PointF(200, 200);
PointF [] points2=new PointF[2];
points2[0]=new PointF(200, 200);
points2[1]=new PointF(200, 200);
p[0] = points;
p[1] = points2;
core.addInkAnnotation(0, p);
第一个新字符串应仅指定外部数组的长度，而不是内部数组的长度-且其长度应为2，请参见要指定2个圆弧。
您忽略了将外部数组元素设置为内部数组。
addInkAnnotation的第一个参数是页码，因此0可能是您想要测试的。
根据您对库执行其他调用的方式，您可能需要通过AsyncTask进行addInkAnnotation调用。
关于android - 向MuPDF android添加注释，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/28564204/