JNI调用java方法

调用java静态方法

jclass led = env->GetObjectClass(jclassled);

//  获取id
jmethodID getLedId = env->GetStaticMethodID(led, "getLedId", "()I");
LOGE("#######getLedId 
");
if (getLedId == NULL)
{
    LOGE("#######error getLedId
");
    return -1; /* method not found */
}
jint id = env->CallIntMethod(led, getLedId);
 LOGE("#######CallIntMethod 
");
//  获取color
jmethodID getColor = env->GetStaticMethodID(led, "getColor", "()[I");
if (getColor == NULL) 
{
    LOGE("#######error getColor
");
    return -1; /* method not found */
}
jint color[3] = {0}; 
jobjectArray resultArray = (jobjectArray) env->CallObjectMethod(led, getColor);
for (int i = 0; i < env->GetArrayLength(resultArray); i++) 
{
    color[i] = (jint) env->GetObjectArrayElement(resultArray, i);
}

LOGE("#######id = %d, r=%d, g=%d, b=%d
", id, color[0], color[1], color[2]);
//  设置led
set_led(id, color[0], color[1], color[2]);

调用java实例方法

jclass led = env->FindClass("com/deptech/common/base/utils/commonUtils/Led");
if (led == NULL)
{
    LOGE("#######not found class.
");
    return -1;
}

// 构造方法
jmethodID mid_construct = env->GetMethodID(led, "<init>","()V");
if (mid_construct == NULL) 
{
    LOGE("#######not found construct func.
");
    return -1;
}

// 获取getLedId方法
jmethodID getLedId = env->GetMethodID(led, "getLedId", "()I");
if (getLedId == NULL)
{    
    LOGE("#######not found getLedId func.
");
    return -1;
}

jmethodID getColorR = env->GetMethodID(led, "getColorR", "()I");
if (getColorR == NULL)
{
    LOGE("#######not found getColorR func.
");
    return -1;
}
jmethodID getColorG = env->GetMethodID(led, "getColorG", "()I");
if (getColorG == NULL)
{
    LOGE("#######not found getColorG func.
");
    return -1;
}
jmethodID getColorB = env->GetMethodID(led, "getColorB", "()I");
if (getColorB == NULL)
{
    LOGE("#######not found getColorB func.
");
    return -1;
}

//  使用构造方法实例化
jobject ledObj = env->NewObject(led, mid_construct);
if (ledObj == NULL) {
    LOGE("#######error NewObject.
");
    return -1;
}

// 调用实例方法
// 获取id
jint id = env->CallIntMethod(ledObj, getLedId);
LOGE("#######CallIntMethod %d.
", id);

//  获取color
jint r, g, b;
r = env->CallIntMethod(ledObj, getColorR);
g = env->CallIntMethod(ledObj, getColorG);
b = env->CallIntMethod(ledObj, getColorB);


jobjectArray resultArray = (jobjectArray) env->CallObjectMethod(ledObj, getColor);
if (resultArray == NULL)
{
    LOGE("#######error resultArray is null.
");
    return -1;
}
for (int i = 0; i < env->GetArrayLength(resultArray); i++) 
{
    color[i] = (long)env->GetObjectArrayElement(resultArray, i);
}

LOGE("#######CallObjectMethod.
");

//  设置led
LOGE("#######id = %d, r=%d, g=%d, b=%d
", id, r, g, b);
set_led(id, r, g, b);

// 释放
env->DeleteLocalRef(led);
env->DeleteLocalRef(ledObj);
//env->DeleteLocalRef(resultArray);