新增：实现testHello())，生成libcomclientjni.so，供APP调用。

code/com_myjni_mynative_MyClientCmd.h

@@ -0,0 +1,21 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include "jni.h"
+/* Header for class com_myjni_mynative_MyClientCmd */
+
+#ifndef _Included_com_myjni_mynative_MyClientCmd
+#define _Included_com_myjni_mynative_MyClientCmd
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     com_myjni_mynative_MyClientCmd
+ * Method:    testHello
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_com_myjni_mynative_MyClientCmd_testHello
+  (JNIEnv *, jobject);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

code/comclientjni.cpp

@@ -0,0 +1,12 @@
+#include "com_myjni_mynative_MyClientCmd.h"
+#include <iostream>
+#include <stdio.h>
+#include <android/log.h>
+
+#define LOG_TAG "MyClientCmd"
+
+JNIEXPORT void JNICALL Java_com_myjni_mynative_MyClientCmd_testHello(JNIEnv *, jobject)
+{
+    printf("this is C++ print");
+    __android_log_print(ANDROID_LOG_INFO, LOG_TAG, "this is C++ print");
+}