GodBlessYou

專案地址: github.com/ximsfei/God…

GBU嘗試在執行時修復Android應用的崩潰問題，在使部分功能失效的前提下，讓應用繼續執行。使用GBU以後，應用將不再會出現”X 已停止執行”的對話方塊。

你可以下載demo apk來體驗一下.

內容

• 實現原理
  • 修復Activity中的Crash
  • 修復Service中的Crash
  • 修復BroadcastReceiver中的Crash
  • 修復其他Crash

實現原理

修復Activity中的Crash

Android framework 通過Instrumentation來呼叫Activity的所有生命週期方法，GBU 通過反射ActivityThread的成員變數mInstrumentation來嘗試修復Activity生命週期回撥中的崩潰。

GbuInstrumentationImpl.kt

override fun callActivityOnCreate(activity: Activity?, icicle: Bundle?) {
    try {
        super.callActivityOnCreate(activity, icicle)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnCreate(activity: Activity?, icicle: Bundle?, persistentState: PersistableBundle?) {
    try {
        super.callActivityOnCreate(activity, icicle, persistentState)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnNewIntent(activity: Activity?, intent: Intent?) {
    try {
        super.callActivityOnNewIntent(activity, intent)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnRestart(activity: Activity?) {
    try {
        super.callActivityOnRestart(activity)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnStart(activity: Activity?) {
    try {
        super.callActivityOnStart(activity)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnResume(activity: Activity?) {
    try {
        super.callActivityOnResume(activity)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnPause(activity: Activity?) {
    try {
        super.callActivityOnPause(activity)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnStop(activity: Activity?) {
    try {
        super.callActivityOnStop(activity)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnDestroy(activity: Activity?) {
    try {
        super.callActivityOnDestroy(activity)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnPostCreate(activity: Activity?, icicle: Bundle?) {
    try {
        super.callActivityOnPostCreate(activity, icicle)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnPostCreate(activity: Activity?, icicle: Bundle?, persistentState: PersistableBundle?) {
    try {
        super.callActivityOnPostCreate(activity, icicle, persistentState)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnSaveInstanceState(activity: Activity?, outState: Bundle?) {
    try {
        super.callActivityOnSaveInstanceState(activity, outState)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnSaveInstanceState(activity: Activity?, outState: Bundle?, outPersistentState: PersistableBundle?) {
    try {
        super.callActivityOnSaveInstanceState(activity, outState, outPersistentState)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnRestoreInstanceState(activity: Activity?, savedInstanceState: Bundle?) {
    try {
        super.callActivityOnRestoreInstanceState(activity, savedInstanceState)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

override fun callActivityOnRestoreInstanceState(activity: Activity?, savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
    try {
        super.callActivityOnRestoreInstanceState(activity, savedInstanceState, persistentState)
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}
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修復Service和BroadcastReceiver中的Crash

Android framework 在呼叫四大元件生命週期的時候，如果出現了異常，會回撥Instrumentation.onException方法。GBU 通過Instrumentation的方法onException返回true來嘗試修復Service和BroadcastReceiver生命週期回撥中的崩潰。同時手動執行framework未完成的程式碼，防止生命週期不完整引起的anr。

GbuInstrumentationImpl.kt

class GbuInstrumentationImpl(base: Instrumentation) : GbuInstrumentationWrapper(base) {

    override fun onException(obj: Any?, e: Throwable?): Boolean {
        GbuActivityThread.handleException(obj)
        return true
    }
}
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GbuActivityThread.kt

object GbuActivityThread {
    fun handleException(obj: Any?) {
        if (Gbu.debug) {
            GbuLog.d(codeToString(mMsg?.what!!))
        }
        if (obj is Service) {
            when (mMsg?.what) {
                CREATE_SERVICE -> handleCreateService(obj)
                SERVICE_ARGS -> handleServiceArgs(obj)
                STOP_SERVICE -> handleStopService(obj)
                BIND_SERVICE -> handleBindService(obj)
                UNBIND_SERVICE -> handleUnbindService(obj)
            }
        } else if (obj is BroadcastReceiver) {
            GbuBroadcastReceiver.setPendingResult(obj, null)
        }
    }
}
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修復其他Crash

參照網上的一些資料實現其他崩潰的捕獲，同時保證主執行緒不會因為崩潰而退出。

object Gbu {
    init {
        Handler(Looper.getMainLooper()).post {
            while (true) {
                try {
                    Looper.loop()
                } catch (e: Throwable) {
                    e.printStackTrace()
                }
            }
        }
        Thread.setDefaultUncaughtExceptionHandler { _: Thread, throwable: Throwable ->
            throwable.printStackTrace()
        }
    }
}
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