package com.test.nativeapp;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

    static {
        try {
            System.load("native/libkdu_jni.so");
        } catch (UnsatisfiedLinkError e) {
          System.err.println("Native code library failed to load.\n" + e);
          System.exit(1);
        }
      }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

LogCat错误：
2018 - 06-18 11：13：55.235：D/dalvikvm（17658）：尝试加载lib native/libkdu_jni.so 0x 421 eeb 38 06-18 11：13：55.235：E/dalvikvm（17658）：dlopen（“native/libkdu_jni.so”）失败：dlopen失败：未找到库“native/libkdu_jni.so”
2018 - 06-18 11：13：55.235：W/System.err（17658）：本机代码库加载失败。
2018 - 06-18 11：13：55.235：W/System.err（17658）：java.lang.UnsatisfiedLinkError:dlopen失败：未找到库“native/libkdu_jni.so”
我应该把这个文件夹放在哪里？