在android ndk中向C发送一个值并获得示例（if）响应

Question

i write this code in my android Activity to send a request to C in android ndk:

Toast.makeText(getApplicationContext(),Calculate("1")+"",Toast.LENGTH_SHORT).show();

public native String Calculate(String j_key_name);

and in ndk side in C file i write this code:

JNIEXPORT jstring JNICALL
Java_org_sample_aguar_NActivity_Calculate(JNIEnv *env, jobject thiz, jstring j_key_name) {

    if (j_key_name == "1") {
        return (*env)->NewStringUTF(env, " its 1 ");
    } else{
        return (*env)->NewStringUTF(env, " it's not 1 ");
    }
}

i don't have any error But That's always run else part and when i send "1" in response i get (it's not 1 ).

Answer 1

I have written simple if-else program in c. I use String.h library in it and working correctly.

#include<string.h>
char j_key_name[] ="1";

int check = strcmp(j_key_name, "1");
if (check == 0) {
    printf("if");
} else{
    printf("else");
}

Let's try above code. Hopefully solve your issue. Thanks in advance.