Kotlin 并没有想的那么好

kotlin 越来越火，但使用的越多发现不顺手的地方也越多。

最近发现了崩溃:

11-17 00:54:07.355 266-266/? A/DEBUG: signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
11-17 00:54:07.359 266-266/? A/DEBUG: Abort message: 'art/runtime/art_method.cc:219] Failed to find Dex offset for PC offset 0xa4e(PC 0xe032e5ba, entry_point=0xe032db6c current entry_point=0xe032db6c) in java.lang.String com.adikia.Origin.print(java.lang.String)'
        eax 00000000  ebx 00003578  ecx 00003578  edx 00000006
        esi f7795c50  edi 00000000
        xcs 00000023  xds 0000002b  xes 0000002b  xfs 00000007  xss 0000002b
        eip f73406c6  ebp 00003578  esp ff8b85f0  flags 00200206
11-17 00:54:07.361 266-266/? A/DEBUG: backtrace:
        #00 pc 000836c6  /system/lib/libc.so (tgkill+22)
        #01 pc 00081728  /system/lib/libc.so (pthread_kill+70)
        #02 pc 00027255  /system/lib/libc.so (raise+36)
        #03 pc 00020a34  /system/lib/libc.so (abort+80)
        #04 pc 0051b2bb  /system/lib/libart.so (art::Runtime::Abort()+377)
        #05 pc 00151759  /system/lib/libart.so (art::LogMessage::~LogMessage()+1383)
        #06 pc 0014bc66  /system/lib/libart.so (art::Barrier::~Barrier()+966)
        #07 pc 00564aff  /system/lib/libart.so (art::ThreadList::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)+271)
        #08 pc 0051b438  /system/lib/libart.so (art::Runtime::Abort()+758)
        #09 pc 00151759  /system/lib/libart.so (art::LogMessage::~LogMessage()+1383)
        #10 pc 001484f6  /system/lib/libart.so (art::ArtMethod::ToDexPc(unsigned int, bool)+2662)
        #11 pc 0052b6ca  /system/lib/libart.so (art::StackVisitor::GetDexPc(bool) const+68)
        #12 pc 00541a01  /system/lib/libart.so (art::BuildInternalStackTraceVisitor<false>::VisitFrame()+131)
        #13 pc 0052eef3  /system/lib/libart.so (art::StackVisitor::WalkStack(bool)+243)
        #14 pc 0055277b  /system/lib/libart.so (_jobject* art::Thread::CreateInternalStackTrace<false>(art::ScopedObjectAccessAlreadyRunnable const&) const+329)
        #15 pc 00483da1  /system/lib/libart.so (art::Throwable_nativeFillInStackTrace(_JNIEnv*, _jclass*)+52)
        #16 pc 730496be  /data/dalvik-cache/x86/system@[email protected] (offset 0x1ef8000)

这是什么鬼，完全看不到原因，后来发现这是由书写不规范而与项目本身的一系列连锁反应引起的。

首先我写了一个java的类:

public class CallbackTest {

    public Object callback(){
        return null;
    }
}

然后再kotlin中复写调用:

             object :CallbackTest(){
                 override fun callback(): Any {
                     Log.v("XPC","origin_method");
                     return super.callback()
                 }
             }.callback()

这样就会报下面的错误

11-17 02:36:01.446 18132-18132/com.adikia E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.adikia, PID: 18132
    java.lang.IllegalStateException: super.callback() must not be null
        at com.adikia.MainActivity$onClick$2.callback(MainActivity.kt:49)
        at com.adikia.MainActivity.onClick(MainActivity.kt:51)
        at android.view.View.performClick(View.java:5198)
        at android.view.View$PerformClick.run(View.java:21147)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5417)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
        at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:107)

其实这个错误很简单，就是返回值不能是null,如果是null我们需要指定:Any?,下面的写法是正确的

             object :CallbackTest(){
                 override fun callback(): Any? {
                     return super.callback()
                 }
             }.callback()

但问题就在于自动生成重载方法的时候，并没有自动加?这就导致类经常会忘记添加，而真正的项目中情况复杂，一旦发生连锁反应，将会很难排查。

Kotlin 并没有想的那么好

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