Android中调用c函数来打印log---(JNI)

c语言打印log输出，hello.c文件中需要有下面几行关键代码：

#include <android/log.h>#define LOG_TAG "System.out"#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)

1.MainActivity.java

package com.itheima.ccalljava;import android.app.Activity;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity {static{System.loadLibrary("hello");}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}public void click(View v){helloC();}public native void helloC();}

2.hello.c

#include <jni.h>#include <android/log.h>#define LOG_TAG "System.out"#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)JNIEXPORT void JNICALL Java_com_itheima_ccalljava_MainActivity_helloC  (JNIEnv * env, jobject obj){//打印log输出LOGD("hello xiaodou");LOGI("hello xiaoxia");}