app崩溃抓取

未处理异常定义：没有被try...catch 住的异常(这里说的异常包括Exception和Error)
Java层默认未处理异常的Handler，都是调用Thread.setDefaultUncaughtExceptionHandler，注册一个UncaughtExceptionHandler来实现的。可以抓到所有线程的未处理异常

final Thread.UncaughtExceptionHandler oldHandler = Thread.getDefaultUncaughtExceptionHandler();Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {@Overridepublic void uncaughtException(Thread thread, Throwable throwable) {// 编写崩溃前的处理逻辑// ...// 此回调既可以收到Exception, 也可以收到Error


                                /*调用默认处理，杀死进程*/oldHandler.uncaughtException(thread, throwable);}});

 

当然也可以注册针对指定线程的未处理异常的Handler，如：

Thread.currentThread().setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {@Overridepublic void uncaughtException(Thread thread, Throwable throwable) {// 编写崩溃前的处理逻辑// ...// 此回调既可以收到Exception, 也可以收到Errorif( /*这是一个致命错误*/ ) {//调用默认处理，杀死进程Thread.getDefaultUncaughtExceptionHandler().uncaughtException(thread, throwable);} else {// 什么也不处理的话， 当前线程被终止，但是整个进程可以继续运行}}});

 

二、native层异常

native异常是通过信号来通知的。所以要想抓到native异常，需要注册信号回调。
注册方法：

static struct sigaction g_oldCSSigAction[8] = {0};void CrashSaver_handleSignal(int sig, siginfo_t* info, void* context);// 注册信号函数void CrashSaver_install(){    // 保存信号的默认行为对象    memset(g_oldCSSigAction, 0, sizeof(g_oldCSSigAction));    sigaction(SIGTRAP, NULL, &g_oldCSSigAction[0]);    sigaction(SIGABRT, NULL, &g_oldCSSigAction[1]);    sigaction(SIGILL, NULL, &g_oldCSSigAction[2]);    sigaction(SIGSEGV, NULL, &g_oldCSSigAction[3]);    sigaction(SIGFPE, NULL, &g_oldCSSigAction[4]);    sigaction(SIGBUS, NULL, &g_oldCSSigAction[5]);    sigaction(SIGPIPE, NULL, &g_oldCSSigAction[6]);    sigaction(SIGSYS, NULL, &g_oldCSSigAction[7]);        // 创建 信号行为对象    struct sigaction newSigAction;           sigemptyset(&newSigAction.sa_mask);    newSigAction.sa_flags = SA_SIGINFO;    /*设置信号处理函数*/    newSigAction.sa_sigaction = CrashSaver_handleSignal;        // 注册信号新的行为对象    sigaction(SIGTRAP, &newSigAction, NULL);    sigaction(SIGABRT, &newSigAction, NULL);    sigaction(SIGILL, &newSigAction, NULL);    sigaction(SIGSEGV, &newSigAction, NULL);    sigaction(SIGFPE, &newSigAction, NULL);    sigaction(SIGBUS, &newSigAction, NULL);    sigaction(SIGPIPE, &newSigAction, NULL);    sigaction(SIGSYS, &newSigAction, NULL);}

编写回调处理函数：

void CrashSaver_handleSignal(int sig, siginfo_t* info, void* context){// sig  触发的信号ID   如 SIGABRT、SIGSEGV等    // info  对此信号的描述信息    // context 信号发生的上下文。比如各种寄存器信息。此结构和具体的CPU平台有关        // 此处增加处理逻辑        CrashSaver_uninstall(); /*反注册*/    raise(signum); /*调用系统默认信号处理*/}

 反注册函数：

void CrashSaver_uninstall(){    sigaction(SIGTRAP, &g_oldCSSigAction[0], NULL);    sigaction(SIGABRT, &g_oldCSSigAction[1], NULL);    sigaction(SIGILL , &g_oldCSSigAction[2], NULL);    sigaction(SIGSEGV, &g_oldCSSigAction[3], NULL);    sigaction(SIGFPE, &g_oldCSSigAction[4], NULL);    sigaction(SIGBUS, &g_oldCSSigAction[5], NULL);    sigaction(SIGPIPE, &g_oldCSSigAction[6], NULL);    sigaction(SIGSYS, &g_oldCSSigAction[7], NULL);    memset(g_oldCSSigAction, 0, sizeof(g_oldCSSigAction));}