android-ndk

问题 I am developing an application for One Plus 6. This applications is using a shared library(lib.so) to perform some task. For the task it needs to open dev/diag first and then send some commands through code. Below is the code to open dev/diag: fd = open("/dev/diag", O_RDWR|O_LARGEFILE|O_NONBLOCK); if (fd < 0) { perror("open diag dev"); return -8002; } I am able to build a executable with include $(BUILD_EXECUTABLE) written in Android.mk and with ndk-build command. I am able to run open the

问题 I have recently encountered a really weird problem while debugging C/C++ application in Android Studio. I am using Android Studio 3.0 Here is my JNI Call JNIEXPORT jshortArray JNICALL Java_net_crosp_android_library_ecgaudioprocessor_EcgSignalProcessorDemodulator_demodulate( JNIEnv *env, jobject instance, jshortArray readBuffer_) { /* get size of the array */ jsize len = env->GetArrayLength(readBuffer_); int sample_rate = 44100; int kd = 12; SignalConfiguration signal_cfg = {sample_rate, kd,

问题 My objective is to send a signal from kernel to a Android service running in the userspace.On receiving this signal, the service should make an IOCTL call back to the kernel. After it gets data from the kernel through this ioctl call,it has to display to the user. For this, i call a native method from my Java Service, which registers the sigaction structure, which includes the handler function for this signal. This handler function will make the IOCTL call and call a Java Function to pass the

问题 I'm new in NDK development and I'm currently facing a problem, when I try to invoke the ndk build tool from cygwin terminal: Android NDK: WARNING: There are no modules to build in this project! I’m under windows (x64) and I use the r10d (64-bit) NDK. I try to invoke it from the root of my project that contains a jni folder with a simple .c file and an Android.mk: LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) # Here we give our module name and source file(s) LOCAL_MODULE := mycfile LOCAL

问题 I have been modifying and playing around with this project: source code : https://bitbucket.org/viet0904163136/gba-android/src It's a gameboy advance emulator licensed under GPLv2. Every thing works ok until i change the packagename in the android manifest file. Without the package name changed the app works without a problem. But when the package name is changed the SDLactivity quits with this message: (i renamed it to com.gba.emu) 09-01 12:23:16.409: I/SDL(884): SDL_Android_Init() 09-01 12

问题 Here is the console log: (no debugging symbols found) D:\ws\test\MyProject\obj\local\armeabi\gdb2.setup:4: Error in sourced command file: :5039: No connection could be made because the target machine actively refused it. localhost:5039: No connection could be made because the target machine actively refused it. Following debug steps for eclipse plugin sequoyah: http://www.eclipse.org/sequoyah/documentation/native_debug.php I'm almost at the end trying to connect the C++ Debugging. My Android

问题 I wrote some video streamer ( C++ ) on PC and now I try to to implement the same cross platform section on Android. I "played" enough with NDK and know a bit about how to compile and integrate C code with Android (aka JNI). The problem is that sometimes my application crashes and as you know Android doesn't point me where code failed (in C/C++ part). Video Streamer code have a lot of libraries and, lets say, open source parts I used so to leave logs - not good idea. I use Eclipse, how can I

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . I've been looking around for solution at least 2 days unsuccesfully so as my last hope I decided to ask it here. Here at work we have a C++ code base using OpenCV that we want to run both on iOS and Android. It turned out that the whole thing runs slower on Android and I can't

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . I've been looking around for solution at least 2 days unsuccesfully so as my last hope I decided to ask it here. Here at work we have a C++ code base using OpenCV that we want to run both on iOS and Android. It turned out that the whole thing runs slower on Android and I can't

问题 I've been developing Android apps with C++ code by just executing ndk-build . I've always used OpenCV, so in my Android.mk there was: include $(CLEAR_VARS) OPENCV_LIB_TYPE:=SHARED OPENCV_CAMERA_MODULES:=off OPENCV_INSTALL_MODULES:=on include /Users/rafaelruizmunoz/Desktop/Android_Tools/OpenCV-2.4.9-android-sdk/sdk/native/jni/OpenCV.mk include $(OPENCV_PATH) and it's been working good. Now I want to debug the C++ code with Android Studio, and I had to do some modifications in the gradle. The