android ndk 开发获取应用包名以及keystroe签名信息

最新推荐文章于 2024-06-06 19:52:34 发布

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最新推荐文章于 2024-06-06 19:52:34 发布

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本文介绍如何使用JNI技术从Android应用中获取应用包名及签名信息，包括定义Java类、编译JNI头文件、编写C/C++逻辑代码并最终在Java层调用的过程。

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在做此操作之前，需要保证ndk环境以配置完成，并对jni的语法有一定的了解。

1.定义native java 类

这里的InfoJni 是在app build 文件中配置的moduleName 保持一致

2.通过jni 编译成.h 文件

首先Terminal 进入到 java 文件夹下 ,然后运行命令—>: javah -encoding utf-8 -jni com.mvp.cn.jni.JNIUtil

3.将刚刚编译玩的头文件放入新建的jni文件夹下

4，在jni文件夹下创建.c 文件，引入刚才放进来的.h头文件，开始写获取自己的代码逻辑

获取包名代码如下：

jclass contextClass = (jclass)(*env)->NewGlobalRef(env,(*env)->FindClass(env,"android/content/Context"));
jmethodID getPackageNameId = (*env)->GetMethodID(env,contextClass, "getPackageName","()Ljava/lang/String;");
jstring packNameString = (jstring)(*env)->CallObjectMethod(env,contextObject, getPackageNameId);
return packNameString;

获取应用签名信息代码如下：

jclass context_class = (*env)->GetObjectClass(env,context_object);
//context.getPackageManager()
jmethodID methodId = (*env)->GetMethodID(env,context_class, "getPackageManager", "()Landroid/content/pm/PackageManager;");
jobject package_manager_object = (*env)->CallObjectMethod(env,context_object, methodId);
if (package_manager_object == NULL) {
// __android_log_print(ANDROID_LOG_INFO, "JNITag","getPackageManager() Failed!");
return NULL;
}

//context.getPackageName()
methodId = (*env)->GetMethodID(env,context_class, "getPackageName", "()Ljava/lang/String;");
jstring package_name_string = (jstring)(*env)->CallObjectMethod(env,context_object, methodId);
if (package_name_string == NULL) {
// __android_log_print(ANDROID_LOG_INFO, "JNITag","getPackageName() Failed!");
return NULL;
}

(*env)->DeleteLocalRef(env,context_class);

//PackageManager.getPackageInfo(Sting, int)
jclass pack_manager_class = (*env)->GetObjectClass(env,package_manager_object);
methodId = (*env)->GetMethodID(env,pack_manager_class, "getPackageInfo", "(Ljava/lang/String;I)Landroid/content/pm/PackageInfo;");
(*env)->DeleteLocalRef(env,pack_manager_class);
jobject package_info_object = (*env)->CallObjectMethod(env,package_manager_object, methodId, package_name_string, 64);
if (package_info_object == NULL) {
// __android_log_print(ANDROID_LOG_INFO, "JNITag","getPackageInfo() Failed!");
return NULL;
}

(*env)->DeleteLocalRef(env,package_manager_object);

//PackageInfo.signatures[0]
jclass package_info_class = (*env)->GetObjectClass(env,package_info_object);
jfieldID fieldId = (*env)->GetFieldID(env,package_info_class, "signatures", "[Landroid/content/pm/Signature;");
(*env)->DeleteLocalRef(env,package_info_class);
jobjectArray signature_object_array = (jobjectArray)(*env)->GetObjectField(env,package_info_object, fieldId);
if (signature_object_array == NULL) {
// __android_log_print(ANDROID_LOG_INFO, "JNITag","PackageInfo.signatures[] is null");
return NULL;
}
jobject signature_object = (*env)->GetObjectArrayElement(env,signature_object_array, 0);

(*env)->DeleteLocalRef(env,package_info_object);

//Signature.toCharsString()
jclass signature_class = (*env)->GetObjectClass(env,signature_object);
methodId = (*env)->GetMethodID(env,signature_class, "toCharsString", "()Ljava/lang/String;");
(*env)->DeleteLocalRef(env,signature_class);
jstring signature_string = (jstring)(*env)->CallObjectMethod(env,signature_object, methodId);
return signature_string;