jni_获取应用包名、签名

java 层

屏幕快照 2016-01-17 下午1.42.36.png

native 层

key.cpp

#include 
#include "key.h"
#include 
#define   LOG_TAG    "JNI_LOG"
#define   LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define   LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
jstring Java_com_huben_key_KeyUtils_getKeyFromJni(JNIEnv *env, jobject clazz, jobject obj)
{    
//char *str = "key from jni";    
//return env->NewStringUTF(str);    
return appenString(env, getPackname(env, clazz, obj), getSignature(env, clazz, obj));
}

jstring getPackname(JNIEnv *env, jobject clazz, jobject obj)
{        
jclass native_class = env->GetObjectClass(obj);    
jmethodID mId = env->GetMethodID(native_class, "getPackageName", "()Ljava/lang/String;");    
jstring packName = static_cast(env->CallObjectMethod(obj, mId));    
return packName;
}

jstring getSignature(JNIEnv *env, jobject clazz, jobject obj)
{    
jclass native_class = env->GetObjectClass(obj);    
jmethodID pm_id = env->GetMethodID(native_class, "getPackageManager", "()Landroid/content/pm/PackageManager;");    
jobject pm_obj = env->CallObjectMethod(obj, pm_id);    
jclass pm_clazz = env->GetObjectClass(pm_obj);    
// 得到 getPackageInfo 方法的 ID    
jmethodID package_info_id = env->GetMethodID(pm_clazz, "getPackageInfo",             "(Ljava/lang/String;I)Landroid/content/pm/PackageInfo;");    jstring pkg_str = getPackname(env, clazz, obj);    
// 获得应用包的信息    
jobject pi_obj = env->CallObjectMethod(pm_obj, package_info_id, pkg_str, 64);    
// 获得 PackageInfo 类     
jclass pi_clazz = env->GetObjectClass(pi_obj);    
// 获得签名数组属性的 ID    
jfieldID signatures_fieldId = env->GetFieldID(pi_clazz, "signatures", "[Landroid/content/pm/Signature;");    
jobject signatures_obj = env->GetObjectField(pi_obj, signatures_fieldId);    
jobjectArray signaturesArray = (jobjectArray)signatures_obj;       
jsize size = env->GetArrayLength(signaturesArray);    
jobject signature_obj = env->GetObjectArrayElement(signaturesArray, 0);    
jclass signature_clazz = env->GetObjectClass(signature_obj);    
jmethodID string_id = env->GetMethodID(signature_clazz, "toCharsString", "()Ljava/lang/String;");    
jstring str = static_cast(env->CallObjectMethod(signature_obj, string_id));    
char *c_msg = (char*)env->GetStringUTFChars(str,0);    
LOGI("signsture: %s", c_msg);    
return str;   
}

jstring appenString(JNIEnv* env, jstring s1, jstring s2)
{   const char *s1x = (env)->GetStringUTFChars(s1, NULL);    
const char *s2x = (env)->GetStringUTFChars(s2, NULL);   
char *sall = new char[strlen(s1x) + strlen(s2x) + 1];   
strcpy(sall, s1x);   
strcat(sall, s2x);   
jstring retval = (env)->NewStringUTF(sall);  
(env)->ReleaseStringUTFChars(s1, s1x);   
(env)->ReleaseStringUTFChars(s2, s2x);   
free(sall);   
return retval;
}

key.h

#include #include 
#ifdef __cplusplusextern "C" 
{
jstring Java_com_huben_key_KeyUtils_getKeyFromJni(JNIEnv *, jobject, jobject);
jstring getPackname(JNIEnv *, jobject, jobject);
jstring getSignature(JNIEnv *, jobject, jobject);
jstring appenString(JNIEnv *, jstring, jstring);}
#endif

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := key
LOCAL_SRC_FILES := key.cpp key.h

include $(BUILD_SHARED_LIBRARY)

Application.mk

APP_STL := stlport_static
APP_ABI := all

build.gradle
defaultConfig下面

ndk {    
    moduleName "Key"   
    ldLibs "log"    
    abiFilters "armeabi", "armeabi-v7a", "x86"
}