GodBlessYou

项目地址: github.com/ximsfei/God…

GBU尝试在运行时修复Android应用的崩溃问题，在使部分功能失效的前提下，让应用继续运行。使用GBU以后，应用将不再会出现"X 已停止运行"的对话框。

你可以下载demo apk来体验一下.

内容

• 实现原理
  • 修复Activity中的Crash
  • 修复Service中的Crash
  • 修复BroadcastReceiver中的Crash
  • 修复其他Crash

实现原理

修复Activity中的Crash

Android framework 通过Instrumentation来调用Activity的所有生命周期方法，GBU 通过反射ActivityThread的成员变量mInstrumentation来尝试修复Activity生命周期回调中的崩溃。

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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修复Service和BroadcastReceiver中的Crash

Android framework 在调用四大组件生命周期的时候，如果出现了异常，会回调Instrumentation.onException方法。GBU 通过Instrumentation的方法onException返回true来尝试修复Service和BroadcastReceiver生命周期回调中的崩溃。同时手动执行framework未完成的代码，防止生命周期不完整引起的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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修复其他Crash

参照网上的一些资料实现其他崩溃的捕获，同时保证主线程不会因为崩溃而退出。

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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