Logging values of variables in Android native ndk

Question

I set up logging with C++ in Android NDK.

I can print a message to logcat like this:

__android_log_write(ANDROID_LOG_INFO, \"tag here\", \"mess         


        

Answer 1

Here's the most concise way I've seen:

#include 

#define  LOG_TAG    "someTag"

#define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
#define  LOGW(...)  __android_log_print(ANDROID_LOG_WARN,LOG_TAG,__VA_ARGS__)
#define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
#define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)

...

// Now you can log very simply like this:
int foo = 42;
LOGD( "This is a number from JNI: %d", foo );

Also, make sure you link to the log library in your Android.mk:

LOCAL_LDLIBS    := -llog