Audio and video development inevitably requires Android NDK debugging, and logging is a frequent need. Here is a summary of how to log elegantly in Android NDK development:
Header File
#include <android/log.h>
Log Levels
/** For internal use only. */
ANDROID_LOG_UNKNOWN = 0,
/** The default priority, for internal use only. */
ANDROID_LOG_DEFAULT, /* only for SetMinPriority() */
/** Verbose logging. Should typically be disabled for a release apk. */
ANDROID_LOG_VERBOSE,
/** Debug logging. Should typically be disabled for a release apk. */
ANDROID_LOG_DEBUG,
/** Informational logging. Should typically be disabled for a release apk. */
ANDROID_LOG_INFO,
/** Warning logging. For use with recoverable failures. */
ANDROID_LOG_WARN,
/** Error logging. For use with unrecoverable failures. */
ANDROID_LOG_ERROR,
/** Fatal logging. For use when aborting. */
ANDROID_LOG_FATAL,
/** For internal use only. */
ANDROID_LOG_SILENT, /* only for SetMinPriority(); must be last */
Usage
Basic usage:
#include <android/log.h>
__android_log_print(ANDROID_LOG_INFO, "log_tag", "this is log:%d", val);
A more elegant approach: macro wrappers:
#include <android/log.h>
#define TAG "Your Log Tag"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,TAG ,__VA_ARGS__) // 定义LOGD类型
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,TAG ,__VA_ARGS__) // 定义LOGI类型
#define LOGW(...) __android_log_print(ANDROID_LOG_WARN,TAG ,__VA_ARGS__) // 定义LOGW类型
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,TAG ,__VA_ARGS__) // 定义LOGE类型
#define LOGF(...) __android_log_print(ANDROID_LOG_FATAL,TAG ,__VA_ARGS__) // 定义LOGF类型
Usage:
LOGI("This is info log!");
LOGD("This is debug log!");
LOGW("This is warn log!");
LOGE("This is error log!");
References
@See https://developer.android.com/ndk/reference/group/logging