[Android Pro] Call log output debug information in Android Studio JNI

Reference to:http://www.linuxidc.com/linux/2014-02/96341.htm

Android development, Java can easily use debugging information log.i, LOG.D ..., the JNI layer can use it? The answer is yes.

1 for ease of use, first macro definition:

Eben_hpc_log.h content is as follows:

#ifndef _included_hpc_log
#define _included_hpc_log
#ifdef __cplusplus
extern "C" {
#endif
#include <android/log.h>
Macros define similar Java layer definitions, different levels of log logi, LOGD, LOGW, LOGE, Logf. Yes, log.i log.d in Java.
#define LOG_TAG "HPC-Jnilog"//This is the identity of the custom LOG
#undef Log//Cancel the default log
#define Logi (...) __android_log_print (Android_log_info,log_tag, __va_args__)
#define LOGD (...) __android_log_print (Android_log_debug,log_tag, __va_args__)
#define LOGW (...) __android_log_print (Android_log_warn,log_tag, __va_args__)
#define LOGE (...) __android_log_print (Android_log_error,log_tag, __va_args__)
#define LOGF (...) __android_log_print (Android_log_fatal,log_tag, __va_args__)

#ifdef __cplusplus
}
#endif
#endif

2 Code in use:

Demo.c

#include <jni.h>
#include "Eben_hpc_log.h"

Jniexport jint jnicall java_cn_hpc_cai_jni_jnilogdemo_test (jnienv* env,jobject jobj)
{
LOGD ("Log.d This is Log:java_cn_hpc_cai_jni_jnilogdemo_test () in JNI");
Logi ("Log.i This is Log:java_cn_hpc_cai_jni_jnilogdemo_test () in JNI");

return 0;
}

3 in App/build.gradle

Defaultconfig {        NDK {            ldlibs "log"            modulename "Xal"         //generated so name            abifilters "Armeabi"  // The output specifies the so library under three ABI architectures. Currently dispensable.            //abifilters "Armeabi", "armeabi-v7a", "x86"  //outputs specify so libraries under three ABI architectures. Currently dispensable.        }    }

The next step is the Java layer invocation:

4 Java Calls

public static final String libname = "Xal";
static {
System.loadlibrary (libname);
}

{
Jnilogdemo demo = new Jnilogdemo ();
Demo.test ();
}

Complete.

[Android Pro] Call log output debug information in Android Studio JNI