Question

我很擅长在Android上使用JNI，而且我一直在编写一个需要实现JNI_OnLoad的应用程序..我已经仔细阅读了互联网的帮助，似乎很多不同的文档在应该如何实现这个功能。不过，我选择的方法似乎可以在我的模拟器上运行，但不能在我的设备上运行。

LogCat产生以下内容：

D/dalvikvm(11317): Trying to load lib /data/app/libHelloAndroid.so 0xb6db9f50
D/dalvikvm(11317): Added shared lib /data/app/libHelloAndroid.so 0xb6db9f50
I/DEBUG   ( 1244): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG   ( 1244): Build fingerprint: 'generic/mfld_cdk/mfld_cdk:2.3.3/GRI40/eng.gerrit2.20110607.120237:eng/test-keys'
I/DEBUG   ( 1244): pid: 11317, tid: 11317  >>> com.example.helloandroid <<<
I/DEBUG   ( 1244): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000001
I/DEBUG   ( 1244):  eax 09353b90  ebx 8293910c  ecx 00000300  edx 00000001
I/DEBUG   ( 1244):  esi 094313e0  edi 84400395
I/DEBUG   ( 1244):  xcs 00000073  xds 0000007b  xes 0000007b  xfs 00000000 xss 0000007b
I/DEBUG   ( 1244):  eip 8440039d  ebp bf859e70  esp bf859e00  flags 00010206
I/DEBUG   ( 1244): #00 
I/DEBUG   ( 1244):     eip: 8440039d  /data/app/libHelloAndroid.so (JNI_OnLoad)
I/DEBUG   ( 1244): #01 
I/DEBUG   ( 1244):     eip: 828a8df9  /system/lib/libdvm.so (Dalvik_java_lang_Runtime_nativeLoad)
I/DEBUG   ( 1244): #02 
I/DEBUG   ( 1244):     eip: 82831cd9  /system/lib/libdvm.so
I/DEBUG   ( 1244): #03 
I/DEBUG   ( 1244):     eip: b680ec7c  
I/DEBUG   ( 1244): #04 
I/DEBUG   ( 1244):     eip: 0004011a  
I/DEBUG   ( 1244): #05 
I/DEBUG   ( 1244):     eip: ffffffff  
I/DEBUG   ( 1244): #06 
I/DEBUG   ( 1244):     eip: ffffffff  
I/DEBUG   ( 1244): #07 
I/DEBUG   ( 1244):     eip: ffffffff  
I/DEBUG   ( 1244): stack: 
I/DEBUG   ( 1244): #00 
I/DEBUG   ( 1244):     bf859e00  a901b083  
I/DEBUG   ( 1244):     bf859e04  8287da14  /system/lib/libdvm.so (dvmLoadNativeCode)
I/DEBUG   ( 1244):     bf859e08  09353b90  [heap] (dvmLoadNativeCode)
I/DEBUG   ( 1244):     bf859e0c  00000000   (dvmLoadNativeCode)
I/DEBUG   ( 1244):     bf859e10  8291f9bf  /system/lib/libdvm.so
I/DEBUG   ( 1244):     bf859e14  094313e0  [heap]
I/DEBUG   ( 1244):     bf859e18  b6db9f50  /dev/ashmem/dalvik-heap (deleted)
I/DEBUG   ( 1244):     bf859e1c  8293910c  /system/lib/libdvm.so
I/DEBUG   ( 1244):     bf859e20  bf859e70  [stack]
I/DEBUG   ( 1244):     bf859e24  82888b77  /system/lib/libdvm.so (dvmCreateCstrFromString)
I/DEBUG   ( 1244):     bf859e28  0000001d   (dvmCreateCstrFromString)
I/DEBUG   ( 1244):     bf859e2c  bf859ea0  [stack] (dvmCreateCstrFromString)
I/DEBUG   ( 1244):     bf859e30  b632ea84  /dev/ashmem/dalvik-LinearAlloc (deleted) (dvmCreateCstrFromString)
I/DEBUG   ( 1244):     bf859e34  00000001   (dvmCreateCstrFromString)
I/DEBUG   ( 1244):     bf859e38  00000000   (dvmCreateCstrFromString)
I/DEBUG   ( 1244):     bf859e3c  09431418  [heap] (dvmCreateCstrFromString)
I/DEBUG   ( 1244):     ......  ......  
I/DEBUG   ( 1244): #01 
I/DEBUG   ( 1244):     bf859e74  828a8df9  /system/lib/libdvm.so (Dalvik_java_lang_Runtime_nativeLoad)
I/DEBUG   ( 1244):     bf859e78  094313e0  [heap] (Dalvik_java_lang_Runtime_nativeLoad)
I/DEBUG   ( 1244):     bf859e7c  b6db9f50  /dev/ashmem/dalvik-heap (deleted) (Dalvik_java_lang_Runtime_nativeLoad)
I/DEBUG   ( 1244):     bf859e80  bf859e94  [stack] (Dalvik_java_lang_Runtime_nativeLoad)
I/DEBUG   ( 1244):     bf859e84  b55611c2  /data/dalvik-cache/data@app@com.example.helloandroid-2.apk@classes.dex (Dalvik_java_lang_Runtime_nativeLoad)
I/DEBUG   ( 1244):     bf859e88  8289ac09  /system/lib/libdvm.so (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859e8c  8293910c  /system/lib/libdvm.so (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859e90  bf859eb0  [stack] (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859e94  00000000   (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859e98  b680ec3c   (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859e9c  b680eb78   (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859ea0  094314e0  [heap] (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859ea4  00000020   (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859ea8  b5fa27fc  /data/dalvik-cache/system@framework@core.jar@classes.dex (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859eac  b680ec24   (dvmGetCaller2Class)
I/DEBUG   ( 1244):     bf859eb0  bf859f50  [stack] (dvmGetCaller2Class)
I/DEBUG   ( 1244):     ......  ......  
I/DEBUG   ( 1244): #02 
I/DEBUG   ( 1244):     bf859eb4  82831cd9  /system/lib/libdvm.so
I/DEBUG   ( 1244):     bf859eb8  b680ec04  
I/DEBUG   ( 1244):     bf859ebc  bf859f58  [stack]
I/DEBUG   ( 1244):     bf859ec0  b63f8f60  /dev/ashmem/dalvik-LinearAlloc (deleted)
I/DEBUG   ( 1244):     bf859ec4  09355e68  [heap]
I/DEBUG   ( 1244):     bf859ec8  b6dbcfa8  /dev/ashmem/dalvik-heap (deleted)
I/DEBUG   ( 1244):     bf859ecc  09355e68  [heap]
I/DEBUG   ( 1244):     bf859ed0  b680ebec  
I/DEBUG   ( 1244):     bf859ed4  09355e68  [heap]
I/DEBUG   ( 1244):     bf859ed8  bf859f4c  [stack]
I/DEBUG   ( 1244):     bf859edc  00000000  
I/DEBUG   ( 1244):     bf859ee0  82c03d68  
I/DEBUG   ( 1244):     bf859ee4  00002000  
I/DEBUG   ( 1244):     bf859ee8  bf859e14  [stack]
I/DEBUG   ( 1244):     bf859eec  bf859f50  [stack]
I/DEBUG   ( 1244):     bf859ef0  bf859f50  [stack]
I/DEBUG   ( 1244):     ......  ......  
I/DEBUG   ( 1244): #03 
I/DEBUG   ( 1244): #04 
I/DEBUG   ( 1244):     b5560980  0004011a  
I/DEBUG   ( 1244):     b5560984  00022071  
I/DEBUG   ( 1244):     b5560988  001a0010  
I/DEBUG   ( 1244):     b556098c  10710001  
I/DEBUG   ( 1244):     b5560990  00000027  
I/DEBUG   ( 1244):     b5560994  0034001a  
I/DEBUG   ( 1244):     b5560998  0035011a  
I/DEBUG   ( 1244):     b556099c  00022071  
I/DEBUG   ( 1244):     b55609a0  000e0010  
I/DEBUG   ( 1244):     b55609a4  00010002  
I/DEBUG   ( 1244):     b55609a8  00000002  
I/DEBUG   ( 1244):     b55609ac  00001358  
I/DEBUG   ( 1244):     b55609b0  0000000b  
I/DEBUG   ( 1244):     b55609b4  00001070  
I/DEBUG   ( 1244):     b55609b8  00220001  
I/DEBUG   ( 1244):     b55609bc  2070000c  
I/DEBUG   ( 1244):     ......  ......  
I/DEBUG   ( 1244): #05 
I/DEBUG   ( 1244): #06 
I/DEBUG   ( 1244): #07

以下是我的JNI_OnLoad实施......

JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
{

    LOGI("Executing JNI_OnLoad");


    JNIEnv *env;
    jint onLoad_err = -1;
    jclass k;
    static const char* const strClassName="com/example/helloandroid/HelloAndroid";

    cached_jvm = vm;

    // Checks JNI version
    if((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK){
        LOGE("JNI Check failure");
        return onLoad_err;
    }

    // Checks if environment is null
    if (env == NULL) {
        LOGE("Env is NULL");
        return onLoad_err;
    }

    k = (*env)->FindClass(env, strClassName);
    if(k == NULL){
        LOGE("Find Class returns NULL");
        return onLoad_err;
    }

    if ((*env)->RegisterNatives(env, k, methods, sizeof(methods)/sizeof(methods[0])) != JNI_OK){
        LOGE("Method registration failure");
        return onLoad_err;
    }

    LOGI("Successfully executed JNI_onLoad");
    return JNI_VERSION_1_4;
}

是否有某些特定的本机代码使其在模拟器上的行为与在实际设备上的行为不同？或者我是否需要在JNI_OnLoad中完成更多工作？

提前致谢！

Answer 1

在模拟器上尚未完成的设备上运行时，您无需执行任何操作。

我从您的日志中注意到您的设备是x86类型的设备。仿真器是ARM处理器......您是否尝试在设备上运行ARM代码或x86代码？

Android＆amp; JNI_OnLoad导致设备崩溃

1 个答案: