UvcCamera:https://github.com/saki4510t/UVCCamera

stopPreview() ,屏幕最后一帧黑屏

UVCPreview.cpp -> clearDisplay(); 控制最后一帧屏幕清除. 屏蔽即可

int UVCPreview::stopPreview() {
    ENTER();
    bool b = isRunning();
    if (LIKELY(b)) {
        mIsRunning = false;
        pthread_cond_signal(&preview_sync);
        pthread_cond_signal(&capture_sync);
        if (pthread_join(capture_thread, NULL) != EXIT_SUCCESS) {
            LOGW("UVCPreview::terminate capture thread: pthread_join failed");
        }
        if (pthread_join(preview_thread, NULL) != EXIT_SUCCESS) {
            LOGW("UVCPreview::terminate preview thread: pthread_join failed");
        }
        clearDisplay();
    }
    clearPreviewFrame();
    clearCaptureFrame();
    pthread_mutex_lock(&preview_mutex);
    if (mPreviewWindow) {
        ANativeWindow_release(mPreviewWindow);
        mPreviewWindow = NULL;
    }
    pthread_mutex_unlock(&preview_mutex);
    pthread_mutex_lock(&capture_mutex);
    if (mCaptureWindow) {
        ANativeWindow_release(mCaptureWindow);
        mCaptureWindow = NULL;
    }
    pthread_mutex_unlock(&capture_mutex);
    RETURN(0, int);
}