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Java 如何接收kernel传过来的数组(推荐)

作者：baidu_37552881

这篇文章主要介绍了Java 如何接收kernel传过来的数组,本文给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友参考下吧

如接收float 类型数组，JNI 定义jfloatArray 类型数据 通过env->ReleaseFloatArrayElements 将float 数据拷贝成jfloatArray类型
JNI 部分：

static jfloatArray TempMlsSensorRead_native(JNIEnv* env , jobject /* clazz */,jint length){
     float * address=(float *)g_device->mlx90640_read(g_device);
           float *example =new float [768]{};
           for(int i=0;i<768;i++){
               example[i]=address[i];
           }
           jfloatArray copyArray = env->NewFloatArray(768);
           env->ReleaseFloatArrayElements(copyArray,example,0);
    return copyArray;
}
static const JNINativeMethod method_table[] = {
  { "nativeTempMlsSensorOpen", "()I", (void*)TempMlsSensorOpen_native },
  { "nativeTempMlsSensorWrite", "(I)I", (void*)TempMlsSensorWrite_native },
+ { "nativeTempMlsSensorRead", "(I)[F", (void*)TempMlsSensorRead_native },
  { "nativeTempMlsSensorReadValue", "()I", (void*)TempMlsSensorRead_native_value },
  { "nativeTempMlsSensorIoctl", "(II)I", (void*)TempMlsSensorIoctl_native },
  { "nativeTempMlsSensorClose", "()I", (void*)TempMlsSensorClose_native },

AIDL 接口添加float 数组类型

interface ITempMlsSensor {
    int TempMlsSensorOpen();
    int TempMlsSensorWrite(int value);
 +  float[] TempMlsSensorRead(int length);
    int TempMlsSensorReadValue();
    int TempMlsSensorIoctl(int cmd, int value);
    int TempMlsSensorClose();
}

JAVA 类型数组类型

    @Override
  +  public float[] TempMlsSensorRead(int length) throws android.os.RemoteException{
  +          return nativeTempMlsSensorRead(length);
  + }
    public static native int nativeTempMlsSensorOpen();
    public static native int nativeTempMlsSensorWrite(int value);
  +  public static native float [] nativeTempMlsSensorRead(int length);
    public static native int nativeTempMlsSensorReadValue();
    public static native int nativeTempMlsSensorIoctl(int cmd,int value);
    public static native int nativeTempMlsSensorClose();

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