Logging values of variables in Android native ndk

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

#include <android/log.h>#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

You could use __android_log_print which uses a sprintf-like syntax that formats your data into a string.

__android_log_print(ANDROID_LOG_INFO, "sometag", "test int = %d", testInt);

Take advantage of the variadic log print function you have available. For my own code, I provide a LogInfo() function to make it simple. Of course there are several options available to you here.

void LogInfo(const char *sTag, const char *fmt, ...){  va_list ap;  va_start(ap, fmt);  __android_log_vprint(ANDROID_LOG_INFO, sTag, fmt, ap);  va_end(ap);}