查阅了很多Unity3D开发Android应用调用串口的方法,很多资料介绍的都是用java调用serial_port库,然后编写jni供Unity3D调用。
Unity3D C#调用JNI库
void Update()
{
using (AndroidJavaClass cls_UnityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
{
using (AndroidJavaObject obj_Activity = cls_UnityPlayer.GetStatic<AndroidJavaObject>("currentActivity"))
{
AndroidJavaClass cls_CompassActivity = new AndroidJavaClass("com.LB.UnityAndroid1.CompassActivity");
cls_CompassActivity.CallStatic("openCom1", obj_Activity);
}
}
}
对于很多C#程序员来说,配置java和android开发环境都很陌生,需要折腾很久。
然而,根本不用这么麻烦,android串口库本来就是c语言写的,而C#语言直接就可以调用C语言编写的动态链接库(android的动态库扩展名是.so),所有jni是没有必要的。
Unity3D C#引用C语言动态链接库函数
#if UNITY_ANDROID
[System.Runtime.InteropServices.DllImport("libserial_port.so")]
protected static extern Int32 Serial_Open([MarshalAs(UnmanagedType.LPTStr)]String path, int baudrate, int flags);
[System.Runtime.InteropServices.DllImport("libserial_port.so")]
protected static extern void Serial_Close(Int32 port);
[System.Runtime.InteropServices.DllImport("libserial_port.so")]
protected static extern Int32 Serial_SendString(Int32 port, string str);
[System.Runtime.InteropServices.DllImport("libserial_port.so")]
protected static extern Int32 Serial_SendData(Int32 port, [MarshalAs(UnmanagedType.LPArray)]byte[] data, int size);
[System.Runtime.InteropServices.DllImport("libserial_port.so")]
protected static extern Int32 Serial_RecvData(Int32 port);
#endif
调用串口函数
Int32 port = Serial_Open(portName, 9600, 0);
byte[] buff = {
0xFA, 0xFB, 0xFC, 0xFD, 0xFF };
int n = Serial_SendData(port, buff, buff.Length);
Serial_Close(port);
将libserial_port.so放入\Assets\Plugins\Android\libs目录下,设置对应CPU目录
配置对应的平台和CPU
附github android-serialport库地址:
https://github.com/cepr/android-serialport-api/tree/master/android-serialport-api/project/libs