//using让 Local Ref 回收

using(AndroidJavaClass javaClazz = new AndroidJavaClass("com.ddianle.Bitmap"))

{

    int res = javaClazz.CallStatic<int>("DrawText", 'a');//调用静态方法

}

public static int DrawText(char c)

{

     return ;

}

public static byte[] DrawText(String str, byte[] b)

{

        return null;

}

IntPtr clazzPtr = AndroidJNI.FindClass("com/ddianle/Bitmap");

IntPtr methodPtr = AndroidJNI.GetStaticMethodID(clazzPtr, "DrawText", "(Ljava.lang.String;[B)[B");

//Two param

IntPtr v1 = AndroidJNI.NewStringUTF("abc");

jvalue j1 = new jvalue();

j1.l = v1;

IntPtr v2 = AndroidJNI.ToByteArray(Encoding.Default.GetBytes("abc"));

jvalue j2 = new jvalue();

j1.l = v2;

IntPtr resPtr = AndroidJNI.CallStaticObjectMethod(clazzPtr, methodPtr, new jvalue[]{j1, j2 });//调用

byte[] b = AndroidJNI.FromByteArray(resPtr);

//...

//删除Local Ref。methodPtr不需要手动删除，因为它不是一个jobject对象。   
AndroidJNI.DeleteLocalRef(clazzPtr);

AndroidJNI.DeleteLocalRef(v1);

AndroidJNI.DeleteLocalRef(v2);

AndroidJNI.DeleteLocalRef(resPtr);