Re: How to access Package Name from JNI/NDK .. ?

[learner]

Pass your activity as a input parameter to the JNI native function. And then call the below APIs

 

static jboolean nativeGetPackageName(JNIEnv* env, jobject this, jobject activity)

{

jclass android_content_Context =env->GetObjectClass(activity);

jmethodID midGetPackageName = env->GetMethodID(android_content_Context,

"getPackageName", "()Ljava/lang/String;");

jstring packageName= (jstring)env->CallObjectMethod(activity, midGetPackageName);

}

 

 

On Tuesday, 26 June 2012 16:31:49 UTC+5:30, ibisum wrote:

Hi,

I would like to replace my use of hard-coded package names in findClass() method calls from within my JNI library, with non hard-coded paths .. "somehow".

The trouble is: how do I get the package name for the currently running app which is using my library, from within the JNI?

[foo64]

I don't think this will work, because with a signature like that you'd need to call JNIEnv::RegisterNatives( jclass, ... ) so it would be callable from Java. Notice the first parameter which is a class reference, which you need to get from somewhere (most likely hardcoded). If you want to avoid calling JNIEnv::RegisterNatives( ) then you'll need to declare your function like this:

JNIEXPORT jboolean JNICALL Java_com_example_package_ClassName_nativeGetPackageName(JNIEnv* env, jobject this, jobject activity)
{
    ...
}

In both cases, you need to hardcode the package and class reference.

I wish I knew a solution for this though.