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javah -jni -d ../jni com.example.jnidemo.MainActivity 

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set classpath=C:/Users/asura/source/repos/Android_JNI/02_JNI_register/Jnidemo/src 

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#include "com_example_jnidemo_MainActivity.h"  JNIEXPORT jstring JNICALL Java_com_example_jnidemo_MainActivity_Hello   (JNIEnv * env, jobject obj) {     return env->NewStringUTF("Hello JNI"); } 

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LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_ARM_MODE := arm LOCAL_MODULE    := hello                                    #模块名称 LOCAL_SRC_FILES := com_example_jnidemo_MainActivity.cpp     #源文件名 include $(BUILD_SHARED_LIBRARY)                             #编译为so库文件 

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APP_ABI := x86 armeabi-v7a 

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ndk-build 

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package com.example.jnidemo;  import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.Toast;  public class MainActivity extends Activity {      static {         System.loadLibrary("hello"); //加载hello模块     }      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         Toast.makeText(this,MainActivity.this.Hello(), 1).show(); //调用jni内方法     }      @Override     public boolean onCreateOptionsMenu(Menu menu) {         // Inflate the menu; this adds items to the action bar if it is present.         getMenuInflater().inflate(R.menu.main, menu);         return true;     }      private native String Hello(); }