如何在android C++文件中打印日志？
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How to print log in android c++ file?
提问by Victor S
I added
我加了
#define LOG_NDEBUG 0
#define LOG_TAG "StagefrightMediaScanner"
#include <utils/Log.h>
in the libstagefright/StagefrightMediaScanner.cpp
在里面 libstagefright/StagefrightMediaScanner.cpp
but can not print anything using LOGV and LOGE, does any other things can I need to do?
但无法使用 LOGV 和 LOGE 打印任何内容，我还需要做其他事情吗？
回答by Usman Kurd
You can use the following code to get Log
可以使用以下代码获取Log
__android_log_print(ANDROID_LOG_ERROR, "TRACKERS", "%s", Str);
and add the following header file
并添加以下头文件
#include <android/log.h>
回答by BonderWu
You can check frameworks/av/media/libstagefright/Android.mk, whether there is
可以查看frameworks/av/media/libstagefright/Android.mk，是否有
LOCAL_SHARED_LIBRARIES += liblog
in it.
在里面。
Then, under frameworks/av/media/libstagefright/
然后，下 frameworks/av/media/libstagefright/
$ mm
$ adb push $OUT/system/lib/libstagefright.so /system/lib/
$ adb shell killall mediaserver
Then reboot your phone or am start a MEDIA_MOUNTEDintent, MediaScanner will work, and the logs you just added(either ALOGE/ALOGVor LOGE/LOGV) should be shown.
然后重新启动您的手机或开始一个MEDIA_MOUNTED意图，MediaScanner 将工作，您刚刚添加的日志（ALOGE/ALOGV或LOGE/LOGV）应该会显示出来。
回答by Tarun Chawla
No you have done right. Just check it whether you are using ALOGV() which is similar to printf(),if you want to print a integer with a log then you can write like this :" ALOGV("Integer is %d",integer);".
不，你做得对。只需检查您是否正在使用类似于 printf() 的 ALOGV()，如果您想打印一个带有日志的整数，那么您可以这样写："ALOGV("Integer is %d",integer);"。
