网站建设百度搜不到,做问卷哪个网站好,建筑工程公司名字,电子商城官方网站官网介绍如下#xff1a;Thread.UncaughtExceptionHandler (Java Platform SE 8 ) 用于线程因未捕获异常而突然终止时调用的处理程序接口。当线程由于未捕获异常而即将终止时#xff0c;Java虚拟机将使用thread . getuncaughtexceptionhandler()查询该线程的UncaughtExceptio… 官网介绍如下Thread.UncaughtExceptionHandler (Java Platform SE 8 ) 用于线程因未捕获异常而突然终止时调用的处理程序接口。当线程由于未捕获异常而即将终止时Java虚拟机将使用thread . getuncaughtexceptionhandler()查询该线程的UncaughtExceptionHandler并调用该处理程序的uncaughtException方法将线程和异常作为参数传递。 如果一个线程没有显式设置它的UncaughtExceptionHandler那么它的ThreadGroup对象充当它的UncaughtExceptionHandler。如果ThreadGroup对象对处理异常没有特殊要求它可以将调用转发给默认的未捕获异常处理程序。 基于此点我们可以将其应用为整个app出现异常后没有在此处添加异常处理的时候捕获异常并进行通用处理。
1、首先实现 Thread.UncaughtExceptionHandler 接口并创建一个单例
class CrashHandler : Thread.UncaughtExceptionHandler {companion object {private const val TAG CrashHandler//外部存储目录private val INNER_PATH Environment.getExternalStorageDirectory().path//自定义文件夹private const val SELF_FILE /lichang///文件名称private const val CRASH_FILE crash_error.logSuppressLint(SimpleDateFormat)private val formatter: DateFormat SimpleDateFormat(yyyy-MM-dd HH:mm:ss.SSS)val sInstance by lazy(LazyThreadSafetyMode.SYNCHRONIZED) {CrashHandler()}}
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2、添加初始化方法 private var infos mutableMapOfString, String()private var mContext: Context? nullprivate var mDefaultHandler: Thread.UncaughtExceptionHandler? null//初始化fun init(context: Context) {this.mContext contextthis.mDefaultHandler Thread.getDefaultUncaughtExceptionHandler()Thread.setDefaultUncaughtExceptionHandler(this)}
3、重写 uncaughtException() 方法 override fun uncaughtException(thread: Thread, throwable: Throwable) {if ((!handleException(throwable)) (this.mDefaultHandler ! null)) {//如果代码中没有处理交给系统处理this.mDefaultHandler!!.uncaughtException(thread, throwable);return;}//延时3秒杀死进程Log.e(TAG, Process will be killed in 2 seconds!);try {Thread.sleep(2000)} catch (e: InterruptedException) {Log.e(TAG, error : , e)}android.os.Process.killProcess(android.os.Process.myPid())exitProcess(1)}/*** 处理异常信息* param throwable* return*/private fun handleException(throwable: Throwable?): Boolean {if (throwable null) {return false}object : Thread() {override fun run() {Looper.prepare()//在此处处理出现异常的情况throwable.printStackTrace()Log.e(TAG, 出现了未捕获异常)Looper.loop()}}.start()this.mContext?.let { collectDeviceInfo(it) }saveCrashInfo2File(throwable)return true}/*** 收集设备信息* param context*/private fun collectDeviceInfo(context: Context) {val packageInfo: PackageInfo?try {packageInfo context.packageManager.getPackageInfo(context.packageName,PackageManager.GET_ACTIVITIES)if (packageInfo ! null) {val versionName if (packageInfo.versionName null) null else packageInfo.versionNameval versionCode packageInfo.versionCode.toString() this.infos[versionName] versionNamethis.infos[versionCode] versionCode}} catch (e: PackageManager.NameNotFoundException) {Log.e(TAG, an error occured when collect package info, e)}//获取Build信息val declaredFields: ArrayField Build::class.java.declaredFieldsval length declaredFields.sizevar i 0while (i length) {val declaredField: Field declaredFields[i]try {declaredField.setAccessible(true)this.infos[declaredField.getName()] declaredField.get(null).toString()} catch (e: Exception) {Log.e(TAG, an error occured when collect crash info, e)}i 1}}/*** 保存crash信息到文件* param throwable* return*/private fun saveCrashInfo2File(throwable: Throwable): String? {var throwable: Throwable? throwableval crashInfos StringBuffer()//添加分隔行crashInfos.append(\r\n)//添加crash时间crashInfos.append(Crash Time)crashInfos.append()crashInfos.append(formatter.format(Date(System.currentTimeMillis())))crashInfos.append(\r\n)val iterator: IteratorMap.EntryString, String infos.entries.iterator()var next: Map.EntryString, String? nullwhile (iterator.hasNext()) {next iterator.next()crashInfos.append(next.key)crashInfos.append()crashInfos.append(next.value)crashInfos.append(\r\n)}val exceptionInfo StringWriter()val printWriter PrintWriter(exceptionInfo)throwable!!.printStackTrace(printWriter)//循环获取throwable的栈信息throwable throwable.causewhile (throwable ! null) {throwable.printStackTrace(printWriter)throwable throwable.cause}printWriter.close()crashInfos.append(exceptionInfo.toString())try {System.currentTimeMillis()if (Environment.getExternalStorageState() Environment.MEDIA_MOUNTED) {val file File($INNER_PATH$SELF_FILE)if (!file.exists()) {file.mkdirs()}val fos FileOutputStream($INNER_PATH$SELF_FILE$CRASH_FILE, true)fos.write(crashInfos.toString().toByteArray())fos.close()}return CRASH_FILE} catch (e: Exception) {Log.e(TAG, an error occured while writing file..., e)}return null}
4、在 BaseApplication 里实现activity 里也行但毕竟 application 生命周期更长可以更好的捕获异常位置。
CrashHandler.sInstance.init(this)
5、验证手动抛出一个error“ throw Exception(error)”
logcat 输出内容如下
10:48:38.287 AndroidRuntime D Shutting down VM
10:48:38.293 AndroidRuntime E FATAL EXCEPTION: mainProcess: com.lichang.source, PID: 29787java.lang.RuntimeException: java.lang.reflect.InvocationTargetExceptionat com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:563)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)Caused by: java.lang.reflect.InvocationTargetExceptionat java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:553)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003) Caused by: java.lang.Exception: errorat com.lichang.source.MainActivity.onCreate$lambda$0(MainActivity.kt:23)at com.lichang.source.MainActivity.$r8$lambda$1d06GL5SsQcwKha8s7cR5MexWzU(Unknown Source:0)at com.lichang.source.MainActivity$$ExternalSyntheticLambda0.onClick(Unknown Source:0)at android.view.View.performClick(View.java:7448)at android.view.View.performClickInternal(View.java:7421)at android.view.View.access$3700(View.java:838)at android.view.View$PerformClick.run(View.java:28870)at android.os.Handler.handleCallback(Handler.java:938)at android.os.Handler.dispatchMessage(Handler.java:99)at android.os.Looper.loopOnce(Looper.java:201)at android.os.Looper.loop(Looper.java:288)at android.app.ActivityThread.main(ActivityThread.java:7941)at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:553) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
10:48:38.299 System.err W java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
10:48:38.299 System.err W at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:563)
10:48:38.299 System.err W at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
10:48:38.300 System.err W Caused by: java.lang.reflect.InvocationTargetException
10:48:38.300 System.err W at java.lang.reflect.Method.invoke(Native Method)
10:48:38.300 System.err W at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:553)
10:48:38.300 System.err W ... 1 more
10:48:38.300 System.err W Caused by: java.lang.Exception: error
10:48:38.301 System.err W at com.lichang.source.MainActivity.onCreate$lambda$0(MainActivity.kt:23)
10:48:38.301 System.err W at com.lichang.source.MainActivity.$r8$lambda$1d06GL5SsQcwKha8s7cR5MexWzU(Unknown Source:0)
10:48:38.301 System.err W at com.lichang.source.MainActivity$$ExternalSyntheticLambda0.onClick(Unknown Source:0)
10:48:38.301 System.err W at android.view.View.performClick(View.java:7448)
10:48:38.302 System.err W at android.view.View.performClickInternal(View.java:7421)
10:48:38.302 System.err W at android.view.View.access$3700(View.java:838)
10:48:38.302 System.err W at android.view.View$PerformClick.run(View.java:28870)
10:48:38.302 System.err W at android.os.Handler.handleCallback(Handler.java:938)
10:48:38.302 System.err W at android.os.Handler.dispatchMessage(Handler.java:99)
10:48:38.303 System.err W at android.os.Looper.loopOnce(Looper.java:201)
10:48:38.303 System.err W at android.os.Looper.loop(Looper.java:288)
10:48:38.303 System.err W at android.app.ActivityThread.main(ActivityThread.java:7941)
10:48:38.303 System.err W ... 3 more
10:48:38.303 CrashHandler E 出现了未捕获异常
10:48:38.472 CrashHandler E Process will be killed in 2 seconds!
---------------------------- PROCESS ENDED (29787) for package com.lichang.source ----------------------------
10:48:40.473 Process I Sending signal. PID: 29787 SIG: 9记录如下
