With BreakPad, native crashes are no longer feared

2. Install BreakPad

1. CD Breakpad directory2. Enter./configure && make in the command windowCopy the code

SRC /processor/ minidumP_stackWalk /minidump_stackwalk /minidump_stackwalk /minidump_stackwalk

3. CMakeCompile the source code

The build configuration

apply plugin: 'com.android.library'

android {
		.....

    defaultConfig {
			....
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11"
            }
        }

        ndk {
            abiFilters "armeabi-v7a"."arm64-v8a"."x86"}}... externalNativeBuild { cmake { path"src/main/cpp/CMakeLists.txt"
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
}
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Breakpad/SRC source causing the AS in CMake configured directly after the AS/Build/make after the break – Build can generate dynamic so libraries.

Note: the downloaded source code lacks the LSS directory, you can click download to get it

4. Write initialization BreakPad

#include <stdio.h> #include <jni.h> #include <android/log.h> #include "client/linux/handler/exception_handler.h" #include "client/linux/handler/minidump_descriptor.h" #define LOG_TAG "dodoodla_crash" #define ALOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, LOG_TAG, __VA_ARGS__) #define ALOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__) #define ALOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__) #define ALOGW(...) __android_log_print(ANDROID_LOG_WARN, LOG_TAG, __VA_ARGS__) #define ALOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__) bool DumpCallback(const google_breakpad::MinidumpDescriptor &descriptor, void *context, bool succeeded) { ALOGD("===============crrrrash================"); ALOGD("Dump path: %s\n", descriptor.path()); return succeeded; } /** extern "C" JNIEXPORT void JNICALL Java_com_devyk_crash_1module_CrashUtils_initBreakpadNative(JNIEnv *env, jclass type, jstring path_) { const char *path = env->GetStringUTFChars(path_, 0); // TODO google_breakpad::MinidumpDescriptor descriptor(path); static google_breakpad::ExceptionHandler eh(descriptor, NULL, DumpCallback, NULL, true, -1); env->ReleaseStringUTFChars(path_, path); } JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) { JNIEnv *env; if (vm->GetEnv((void **) &env, JNI_VERSION_1_6) ! = JNI_OK) { return JNI_ERR; } return JNI_VERSION_1_6; }Copy the code

Generate DMP files and locate crash

1. Deliberately writing crash code in app module

/** * cause crash */
void Crash(a) {
    volatile int *a = (int *) (NULL);
    *a = 1;
}

extern "C"
JNIEXPORT void JNICALL
Java_com_devyk_ykcrash_MainActivity_testCrash(JNIEnv *env, jclass type) {

    // TODO
    Crash();
}
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2. Capture of init native crash

// Configure native crash capture
CrashUtils.initCrash(String nativeCrashPath);
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3. Create Crash and generate the xxx.dmp file

Here see the generated xxx. DMP file, the following need to DMP to TXT file a little we can see understand.

4. dmp to txt

conclusion

I had no idea breakpad was an open source library, and it was Google’s. Crash capture is necessary because of the amount of C++ code used in the project. Tencent Bugly, which I had been using before Breakpad, stopped because Bugly only supports the Internet environment. Why? Because the products developed by the company are used by the government (the government has a special network belonging to the LOCAL area network).

Finally, I recorded the compilation and use of Breakpad to provide a convenient way for future users, and packaged it into a crash_build_module that can be clicked to download.

Thank you very much

• Android Development Master Course – Zhang Shaowen (Tinker Principal)
• Google breakpad