小编Pan*_*anu的帖子

我试图通过根据下面的代码设置字节数组参数来通过 JNI 调用 java 方法。

extern "C"
JNIEXPORT void JNICALL
Java_test_example_test_MainActivity_testOnProgress(JNIEnv *env, jobject instance,
                                                   jobject callback) {

    //declare ref java class
    jclass jClassTestCallBack = env->GetObjectClass(callback);

    //declare java method id
    jmethodID jMethodIdOnProgress = env->GetMethodID(jClassTestCallBack,"onProgress","([B)V");

    //check null
    if(jMethodIdOnProgress == 0){
        return;
    }

    jbyteArray result = env->NewByteArray(10);
    env->CallVoidMethod(callback,jMethodIdOnProgress,result);

}

在java中。

public class MainActivity extends AppCompatActivity {

    private final String TAG = getClass().getSimpleName();

    // Used to load the 'native-lib' library on application startup.
    static {
        System.loadLibrary("native-lib");
    }

    /**
     * A native method that is …