11.使用google官方提供的breakpad
地址：Android 捕获native异常
https://github.com/google/breakpad
2.编译breakpad的so文件
2.1设置需要编译的架构
3.编译完，在build\intermediates\cmake\debug\obj目录下获取对应架构的so包
4.编译一个错误的so包，模拟native报错
4.1 创建一个native c++项目
4.2CMakeLists.txt设置和native-lib.cpp代码
4.2.1CMakeLists.txt
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html# Sets the minimum version of CMake required to build the native library.cmake_minimum_required(VERSION 3.18.1)# Declares and names the project.project("myapplication")# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.add_library( # Sets the name of the library.myapplication# Sets the library as a shared library.SHARED# Provides a relative path to your source file(s).native-lib.cpp)# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.find_library( # Sets the name of the path variable.log-lib# Specifies the name of the NDK library that# you want CMake to locate.log)# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.target_link_libraries( # Specifies the target library.myapplication# Links the target library to the log library# included in the NDK.${log-lib})set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32") #设置为生成 32 位,个人demo设置
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")#指示 C++ 编译器生成 32 位so包
set_target_properties(myapplication PROPERTIES OUTPUT_NAME "test") #设置生成so包名称
4.2.2native-lib.cpp代码
#include <jni.h>
#include <string>extern "C" JNIEXPORT jstring JNICALL
Java_com_myapplication_MainActivity_stringFromJNI(JNIEnv* env,jobject /* this */) {// 人为引发一个错误int* ptr = nullptr;*ptr = 12; // 这里会导致空指针异常std::string hello = "Hello Word";return env->NewStringUTF(hello.c_str());
}
4.3设置架构
4.4编译，在\build\intermediates\cmake\debug\obj\目录下获取so库
5.测试出现native错误
5.1，将libbreakpad-core.so（google捕获native错误）和libtest.so（出现c++错误）集成到要运行的项目里
5.2初始化Breakpad
BreakpadInit.initBreakpad(File(instance.getExternalFilesDir(null), "CrashFiles").absolutePath)
public class BreakpadInit {static {System.loadLibrary("breakpad-core");}public static void initBreakpad(String path){initBreakpadNative(path);}private static native void initBreakpadNative(String path);
}
5.3加载错误代码
init {System.loadLibrary("test");
}external fun stringFromJNI(): String?Log.d("stringFromJNI","stringFromJNI="+stringFromJNI())
5.4在logcat，输入DEBUG可以知道具体错误
6.获取/storage/emulated/0/Android/data/包名/files/crashFiles下的dmp文件
7.解析dmp文件，在breakpad源码下Breakpad-master\tools\mac获取minidump_stackwalk工具
7.1切换到Breakpad-master\tools\mac目录下，运行命令minidump_stackwalk C:\Users\86138\Desktop\apk\crashFiles\d09869f4-cdaf-4f03-85f57d8e-e4fd512b.dmp >carsh.txt
会生成carsh.txt， 0 libtest.so + 0x125b8 发生的so库和寄存器信息
8.符号反解
8.1在Android SDK目录下，找到addr2line工具
8.2我测试的so库是32位的，选择是D:\android-ndk-r10e\toolchains\arm-linux-androideabi-4.8\prebuilt\windows-x86_64\bin下的addr2line工具
8.3 根据前面的位置和寄存器信息，反解
arm-linux-androideabi-addr2line.exe -f -C -e C:\Users\86138\Desktop\apk\crashFiles\libtest.so 0x125b8得到具体的代码位置
