有什么简单的方法可以登录Android NDK代码吗？ |
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问题描述
I'm looking for a way to easily debug C code in an Android NDK application using Eclipse. I've read ways to debug the app using gdb or something similar but what I want is a way to push messages to Eclipse somehow. I'm looking for a solution that's as simple as using a print function in C and seeing it in the DDMS Log or anything similar. Does anyone have any experience doing this? 推荐答案You can use the Android logging facilities: #include #define APPNAME "MyApp" __android_log_print(ANDROID_LOG_VERBOSE, APPNAME, "The value of 1 + 1 is %d", 1+1);Make sure you also link against the logging library, in your Android.mk file: LOCAL_LDLIBS := -llog 其他推荐答案No one has posted info about different log levels so far. The answer is an attempt to make the logging "picture" full. #include #define TAG "MY_TAG" #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, TAG, __VA_ARGS__) #define LOGW(...) __android_log_print(ANDROID_LOG_WARN, TAG, __VA_ARGS__) #define LOGI(...) __android_log_print(ANDROID_LOG_INFO, TAG, __VA_ARGS__) #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__)Usage: char err[] = "wrong"; LOGE("Something went %s", err);Link Android log library as below. Android.mk: LOCAL_LDLIBS := -llogCMakeLists.txt: find_library( log-lib log ) target_link_libraries( ${log-lib} )Further reading: Logging 其他推荐答案The easiest way is probably to redirect printf() statements to the system log (based on the "Viewing stdout and stderr" section of the official ADB reference manual. Type these 3 commands on a command line: adb shell stop adb shell setprop log.redirect-stdio true adb shell startThen you can view the output of your "printf()" statements by looking at the "LogCat" window of Eclipse Debugger, or by typing this on a command line: adb logcatJust be aware that since the data is buffered before transferring from the emulator or device, you should definitely flush the stdout buffer, eg: printf("Hello, I am %d years old!\n", 30); fflush(stdout);You should then see a log message starting with "I/stdout:" |
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