Sample projects crash after selecting UVC camera

[saki4510t]

Sample projects crash after selecting UVC camera

[nmcdonaldd]

Having the same issue just running the debug apk file. Crashing after selecting a camera on Android 4.4.2 Samsung Galaxy Tab 8.1 Pro

[nmcdonaldd]

Seems to be failing here. Says: java.lang.NoClassDefFoundError: com/serenegiant/usb/UVCCamera. But the other libraries load fine and I am not sure why if this one is going to fail. I'll keep researching.

[nmcdonaldd]

Figured it out. This line and this line need to be changed to the correct directory path of your files. So for instance, I changed line 231 to com/thd/usbcameratest/usb/UVCCamera since that is my project structure, and it works fine then (and I did something similar for line 223). Would be nice to use some dependence injection principles here instead of having to hard code in the project structure. I might fork this and make this change.

[saki4510t]

Hi, I'm sorry answer is delay.

If you want to change class name or package name of UVCCamera.java, you also need to change native side as nmcdonaldd said. Additionally need to add proguard settings in proguard-project.txt for release build.

Currently it is like this.

-keepclassmembers public class com.serenegiant.usb.UVCCamera {
    public *;
    protected *;
    private *;
}

saki

[chungithub]

hi,saik!
how to fix this issues? follow nmcdonaldd,line 231,line 223 no path setting can find.

static jint nativeSetFrameCallback(JNIEnv *env, jobject thiz,
ID_TYPE id_camera, jobject jIFrameCallback, jint pixel_format) {

jint result = JNI_ERR;
ENTER();                                                         //line 223
UVCCamera *camera = reinterpret_cast<UVCCamera *>(id_camera);
if (LIKELY(camera)) {
    jobject frame_callback_obj = env->NewGlobalRef(jIFrameCallback);
    result = camera->setFrameCallback(env, frame_callback_obj, pixel_format);
}
RETURN(result, jint);

}
//line 231

[saki4510t]

Hi,

Di you see any error message on log cat? I assume you would forget to change line 846 of serenegiant_usb_UVCCamera.cpp to your FQN(fully qualified name).

As you can see on USBCameraTest5 project, nativeSetFrameCallback function(and it's dependency; UVCCamera#setFrameCallback and UVCPreview#setFrameCallback) does not depend on what class actually implements the IFrameCallback(but needs to keep existing the instance).

Although I'm not sure why you want to change FQN...you usually don't change FQN of any classes on Android SDK, Java libraries etc. don't you? I think in most case it is just increase useless trouble...

with best regards,
saki