Creating a property in Java and in a C file
I am currently facing the current situation:
I would like to create a toggle for Double Tap to Wake gestures that is "on" with the following commit on the Nexus 6 PowerHAL: https://gerrit.omnirom.org/#/c/13930/1/power/power_shamu.c
I would like to achieve this using a system application (written in java) to enable or disable this feature (written to the kernel sysfs path in the above C file).
Clearly I can't just wrap it in an ifdef or whatever, but I was told that I can create a property in the application (Java file) and then inherit it in the C file.
In theory, it would function like this:- Enable / disable the feature in the application (Java sets the property on or off)
- The property is used by the C file to determine what value to write to the sysfs path.
The contents of the sysfs file will be as simple as comparing the file values between enabled and disabled, I am more interested in the logic involved.
I know very little Java, but I have a solid foundation for C ++.
I searched some google searches and couldn't find anything relevant.
Any insight would be great.
- Jake
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Android NDK has everything you need
public class MyActivity extends Activity {
static {
System.loadLibrary("library");
}
/**
* Native method implemented in C/C++
*/
public native String toggleFoo();
}
#include <string.h>
#include <jni.h>
jstring Java_com_package_MyActivity_toggleFoo(JNIEnv* env, jobject javaThis) {
return (*env)->NewStringUTF(env, "Hello from native code!");
}
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