In Android native C/C++ development (AOSP HALs, AudioFlinger, or NDK libraries), ALOGV() (Verbose Log Macro) statements are stripped out by default in production builds to optimize CPU cycles and keep Logcat clean. Enabling these verbose logs is required when debugging low-level hardware abstraction layers.

Method 1: Source Code Macro Override (#define LOG_NDEBUG 0)

At the very top of your C/C++ source file (before including <log/log.h>), explicitly define LOG_NDEBUG 0 to enable ALOGV macro expansion:

my_native_hal.cppcpp
// Enable ALOGV macros ONLY for this file (Must precede log/log.h!)
#define LOG_NDEBUG 0
#define LOG_TAG "MyCustomHAL"
 
#include <log/log.h>
 
void process_audio_buffer(void *buffer, size_t bytes) {
    // ALOGV will now print to Logcat in debug builds!
    ALOGV("process_audio_buffer: Received %zu bytes at memory address %p", bytes, buffer);
}

Method 2: Runtime System Property Toggle (setprop)

ADB Terminal Commandsbash
# Dynamically enable VERBOSE logging level for a specific LOG_TAG
adb root
adb shell setprop log.tag.MyCustomHAL VERBOSE
 
# View live native verbose log output
adb logcat -s MyCustomHAL:V