Java Question JNI

    static {
        System.loadLibrary("Curl");
        System.loadLibrary("MP4");
        System.loadLibrary("mXML");
        System.loadLibrary("NDPlayer");
        System.loadLibrary("NDRender");
        System.loadLibrary("NetDEVSDK");
        System.loadLibrary("RM_Module");
        System.loadLibrary("ezsdk3.0");
    }

package com.uniview.smb.ezsdk.wrapper;

import android.util.Log;
import android.view.Surface;

import com.uniview.smb.ezsdk.demo.ChannelInfo;
import com.uniview.smb.ezsdk.demo.DeviceInfo;

import java.util.ArrayList;

public class DeviceWrapper {
    private static String TAG = "WRAP";
    public native int sdkInit();
    public native int sdkLogin(String deviceIP, int port, String userName, String userPass);
    public native int sdkLogout(int userID);
    public native int sdkGetVersion();
    public native int sdkGetLastError();
    public native ArrayList<ChannelInfo> sdkGetChlList(int userID);
    public native int sdkStartLive(int userID, int channel);
    public native int sdkStopLive(int handle);
    public native int sdkCapture(int handle, String fileName);
    public static native void setRenderSurface(Surface view);

    public static boolean sdkInited = false;
    public DeviceWrapper() {
        if (DeviceWrapper.sdkInited)
            return;

        DeviceWrapper.sdkInited = true;
        sdkInit();

        Log.i(TAG, "SDK initialized, version " + sdkGetVersion());
    }

    public int GetLastError()
    {
        return sdkGetLastError();
    }

    public int Login(DeviceInfo deviceInfo)
    {
        return sdkLogin(deviceInfo.deviceIP, deviceInfo.devicePort, deviceInfo.userName, deviceInfo.userPass);
    }

    public int Logout(int userID)
    {
        return sdkLogout(userID);
    }

    public ArrayList<ChannelInfo> GetChlList(int userID)
    {
        return sdkGetChlList(userID);
    }

    public int StartLive(int userID, int channel) {
        return sdkStartLive(userID, channel);
    }

    public int StopLive(int handle) {
        return sdkStopLive(handle);
    }

    public int CapturePic(int handle, String fileName) {
        return sdkCapture(handle, fileName);
    }
}