JAVA_CODE：
public class Employee {
private int age;
private String name;
public Employee(int age, String name) {
this.age = age;
this.setName(name);
}
public int getAge() {
return this.age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
}
C结构：
typedef struct Employee_s {
int age;
char name[200];
}Employee_t;
JNI代码看：
jint
Java_com_example_cloudonlibtest_CloudOnLibTestActivity_second( JNIEnv* env,
jobject this, jobject employeeObject)
{
Employee_t em;
em.age =418;
strcpy(em.name, "TheCat");
jclass employeeClass = (*env)->GetObjectClass(env, employeeObject);
jmethodID mid = (*env)->GetMethodID(env,employeeClass , "setAge", "(I)V");
(*env)->CallVoidMethod(env,employeeObject, mid,em.age);
jmethodID st = (*env)->GetMethodID(env,employeeClass , "setName", "(Ljava/lang/String;)V");
(*env)->CallVoidMethod(env,employeeObject, st, em.name);
return 1;
}
我可以设置年龄字段，但未能将名称设置为失败。我的代码有什么问题？
It didn't work see log below
I/DEBUG ( 31): Build fingerprint: 'generic/google_sdk/generic/:2.2/FRF91/43546:eng/test-keys'
I/DEBUG ( 31): pid: 330, tid: 330 >>> com.example.jni <<<
I/DEBUG ( 31): signal 11 (SIGSEGV), fault addr deadd00d
I/DEBUG ( 31): r0 00000374 r1 0000000c r2 0000000c r3 deadd00d
I/DEBUG ( 31): r4 00000026 r5 80887fc4 r6 00000000 r7 fffe6624
I/DEBUG ( 31): r8 bed4e8e8 r9 4186bccc 10 4186bcb4 fp 00000000
I/DEBUG ( 31): ip 808881ec sp bed4e808 lr afd154c5 pc 8083b162 cpsr 20000030
I/DEBUG ( 31): #00 pc 0003b162 /system/lib/libdvm.so
I/DEBUG ( 31): #01 pc 0002cff4 /system/lib/libdvm.so
I/DEBUG ( 31): #02 pc 0002d11a /system/lib/libdvm.so
I/DEBUG ( 31): #03 pc 0002dbf0 /system/lib/libdvm.so
I/DEBUG ( 31): #04 pc 00000542 /data/data/com.example.jni/lib/libtest-lib.so
I/DEBUG ( 31): #05 pc 00013974 /system/lib/libdvm.so
I/DEBUG ( 31): #06 pc 0003de3c /system/lib/libdvm.so
I/DEBUG ( 31): #07 pc 00037216 /system/lib/libdvm.so
I/DEBUG ( 31): #08 pc 000432ec /system/lib/libdvm.so
I/DEBUG ( 31): #09 pc 00018714 /system/lib/libdvm.so
I/DEBUG ( 31): #10 pc 0001e8c4 /system/lib/libdvm.so
I/DEBUG ( 31): #11 pc 0001d790 /system/lib/libdvm.so
I/DEBUG ( 31): #12 pc 0005408e /system/lib/libdvm.so
I/DEBUG ( 31): #13 pc 0005bde2 /system/lib/libdvm.so
I/DEBUG ( 31): #14 pc 00018714 /system/lib/libdvm.so
I/DEBUG ( 31): #15 pc 0001e8c4 /system/lib/libdvm.so
I/DEBUG ( 31): #16 pc 0001d790 /system/lib/libdvm.so
I/DEBUG ( 31): #17 pc 00053eec /system/lib/libdvm.so
I/DEBUG ( 31): #18 pc 0004072c /system/lib/libdvm.so
I/DEBUG ( 31): #19 pc 00034454 /system/lib/libdvm.so
I/DEBUG ( 31): #20 pc 0002c930 /system/lib/libandroid_runtime.so
I/DEBUG ( 31): #21 pc 0002d85c /system/lib/libandroid_runtime.so
I/DEBUG ( 31): #22 pc 00008c86 /system/bin/app_process
I/DEBUG ( 31): #23 pc 0000d362 /system/lib/libc.so
I/DEBUG ( 31):
I/DEBUG ( 31): code around pc:
I/DEBUG ( 31): 8083b140 1861447c 200618a2 e878f7d8 f7d82000
I/DEBUG ( 31): 8083b150 4808e9e4 6bdb5823 d0002b00 4b064798
I/DEBUG ( 31): 8083b160 701c2426 ea5cf7d8 0004ce80 fffe4ae0
I/DEBUG ( 31): 8083b170 fffe801c 00000374 deadd00d b510b40e
I/DEBUG ( 31): 8083b180 4c0a4b09 447bb083 aa05591b 6b5bca02
I/DEBUG ( 31):
I/DEBUG ( 31): code around lr:
I/DEBUG ( 31): afd154a4 b0834a0d 589c447b 26009001 686768a5
I/DEBUG ( 31): afd154b4 220ce008 2b005eab 1c28d003 47889901
I/DEBUG ( 31): afd154c4 35544306 d5f43f01 2c006824 b003d1ee
I/DEBUG ( 31): afd154d4 bdf01c30 0002ae7c 000000d4 1c0fb5f0
I/DEBUG ( 31): afd154e4 43551c3d a904b087 1c16ac01 604d9004
I/DEBUG ( 31):
I/DEBUG ( 31): stack:
I/DEBUG ( 31): bed4e7c8 00000015
I/DEBUG ( 31): bed4e7cc afd1453b /system/lib/libc.so
I/DEBUG ( 31): bed4e7d0 afd405a0 /system/lib/libc.so
I/DEBUG ( 31): bed4e7d4 afd4054c /system/lib/libc.so
I/DEBUG ( 31): bed4e7d8 00000000
I/DEBUG ( 31): bed4e7dc afd154c5 /system/lib/libc.so
I/DEBUG ( 31): bed4e7e0 0000ccb0 [heap]
I/DEBUG ( 31): bed4e7e4 afd1450d /system/lib/libc.so
I/DEBUG ( 31): bed4e7e8 fffe6624
I/DEBUG ( 31): bed4e7ec 80887fc4 /system/lib/libdvm.so
I/DEBUG ( 31): bed4e7f0 80887fc4 /system/lib/libdvm.so
I/DEBUG ( 31): bed4e7f4 00000000
I/DEBUG ( 31): bed4e7f8 fffe6624
I/DEBUG ( 31): bed4e7fc afd1456b /system/lib/libc.so
I/DEBUG ( 31): bed4e800 df002777
I/DEBUG ( 31): bed4e804 e3a070ad
I/DEBUG ( 31): #00 bed4e808 00000001
I/DEBUG ( 31): bed4e80c 8082cff9 /system/lib/libdvm.so
I/DEBUG ( 31): #01 bed4e810 00000001
I/DEBUG ( 31): bed4e814 8082d11f /system/lib/libdvm.so
I/BootReceiver( 59): Copying /data/tombstones/tombstone_04 to DropBox (SYSTEM_TOMBSTONE)
答案 0 :(得分：5)
您需要创建并传递Java String对象(Ljava/lang/String;)，而不是本机字符串。
http://java.sun.com/docs/books/jni/html/objtypes.html#4035
答案 1 :(得分：4)
每当你看到0xdeaddood的故障地址时，你就知道VM故意中止（调用dvmAbort）：
I / DEBUG（31）：信号11（SIGSEGV），故障地址deadd00d
所以，如果你在日志中看到它，你应该看到它打印了一个原因为什么它会中止。
如果你正在编写JNI，你也应该使用CheckJNI：http://android-developers.blogspot.com/2011/07/debugging-android-jni-with-checkjni.html
答案 2 :(得分：0)
这是C上的工作方法。试试这个，如果您有疑问请问......
jclass employeeClass = (*env)->GetObjectClass(env, employeeObject);
jfieldID fid = NULL;
char* ped = "TheCat";
fid = (*env)->GetFieldID(env, employeeClass, "setName", "Ljava/lang/String;");
if( fid != NULL ) {
jstring myStr = (*env)->NewStringUTF( env, ped);
// Set "eventData".
(*env)->SetObjectField(env, enrollClassObject, fid, myStr);
}