我有一个JNI方法,其中我试图调用Java方法。这是我的JNI代码:
void DummySink::afterGettingFrame(unsigned frameSize, unsigned numTruncatedBytes,
struct timeval presentationTime, unsigned /*durationInMicroseconds*/) {
__android_log_print(ANDROID_LOG_VERBOSE, "RTSP", "Frame: %c", propRec->sPropBytes);
jmethodID mid;
jclass handlerClass = env9->FindClass("ob/android/Stream");
if (handlerClass == NULL) {
__android_log_print(ANDROID_LOG_VERBOSE, "RTSP-Error", "Class");
}
mid = env9->GetMethodID(handlerClass, "onResponse", "([B)V");
if (mid == NULL) {
__android_log_print(ANDROID_LOG_VERBOSE, "RTSP-Error", "Method");
}
jbyteArray jbArray = env9->NewByteArray((int)propRec->sPropLength);
env9->SetByteArrayRegion(jbArray, 0, (int)propRec->sPropLength, (jbyte*)propRec->sPropBytes);
//jobject theClass = env9->FindClass("ob/android/Stream");
env9->CallVoidMethod(handlerClass, mid, jbArray);
}
这是我的Java代码:
public void onResponse(byte[] str)
{
Log.v("Response", "Java");
}
我遇到了以下的崩溃问题:
03-08 16:01:05.915: W/dalvikvm(17552): JNI WARNING: can't call Lob/android/Stream;.onResponse on instance of Ljava/lang/Class;
03-08 16:01:05.915: W/dalvikvm(17552): in Lob/android/Stream;.stream:()V (CallVoidMethodV)
应用Mah的答案后,我收到了以下异常。
03-08 16:40:20.646: W/dalvikvm(4076): JNI WARNING: JNI method called with exception pending
03-08 16:40:20.646: W/dalvikvm(4076): in Lob/android/Stream;.stream:()V (NewByteArray)
03-08 16:40:20.646: W/dalvikvm(4076): Pending exception is:
03-08 16:40:20.646: I/dalvikvm(4076): java.lang.NoSuchMethodError: no method with name='onResponse' signature='([B)V' in class Lob/android/Stream;
03-08 16:40:20.646: I/dalvikvm(4076): at ob.android.Stream.stream(Native Method)
03-08 16:40:20.646: I/dalvikvm(4076): at ob.android.Stream.<init>(Stream.java:28)
03-08 16:40:20.654: I/dalvikvm(4076): at ob.android.MainActivity.startRecording(MainActivity.java:203)
现在onResponse方法是静态的。
CallVoidMethod
是一个典型的例子。请参阅http://developer.android.com/training/articles/perf-jni.html#exceptions。 - fadden