在项目中，我们的应用经常会遇到崩溃的情况，如果你的项目已经发送到了应用市场上，那么应用发生的崩溃开发人员是开不到的，所以我们要想办法将异常信息传到服务器上，便于开发人员查看并作出修改。Google考虑到这一点，也提供了Thread.UncaughtExceptionHandler接口来实现这一问题。
创建Crash异常捕获很简单，主要的步骤有：
1.创建BaseApplication继承Application并实现Thread.UncaughtExceptionHandler
2.通过Thread.setDefaultUncaughtExceptionHandler(this)设置默认的异常捕获
3.最后在manifests中注册创建的BaseApplication
一、异常捕捉的简单实用
public class BaseApplication extends Application implements Thread.UncaughtExceptionHandler { @Override public void onCreate() { super.onCreate(); //设置异常捕获 CrashHandler catchHandler = CrashHandler.getInstance(); catchHandler.init(this); } }
二、CrashHandler（主要是实现uncaughtException方法）
public class CrashHandler implements UncaughtExceptionHandler { public static final String TAG = "CrashHandler"; // 系统默认的UncaughtException处理类 private Thread.UncaughtExceptionHandler mDefaultHandler; // CrashHandler实例 private static CrashHandler instance; // 程序的Context对象 private Context mContext; // 用来存储设备信息和异常信息 private Map<String, String> infos = new HashMap<String, String>(); // 用于格式化日期,作为日志文件名的一部分 private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss"); MyActivityLifecycleCallbacks mMyActivityLifecycleCallbacks = new MyActivityLifecycleCallbacks(); /** 保证只有一个CrashHandler实例 */ private CrashHandler() { } /** 获取CrashHandler实例 ,单例模式 */ public static CrashHandler getInstance() { if (instance == null) instance = new CrashHandler(); return instance; } /** * 初始化 */ public void init(SspApplication context) { mContext = context; context.registerActivityLifecycleCallbacks(mMyActivityLifecycleCallbacks); // 获取系统默认的UncaughtException处理器 mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler(); // 设置该CrashHandler为程序的默认处理器 Thread.setDefaultUncaughtExceptionHandler(this); } /** * 当UncaughtException发生时会转入该函数来处理 */ @Override public void uncaughtException(Thread thread, Throwable ex) { if (!handleException(ex) && mDefaultHandler != null) { // 如果用户没有处理则让系统默认的异常处理器来处理 mDefaultHandler.uncaughtException(thread, ex); } else { // try { // Thread.sleep(3000); // } catch (InterruptedException e) { // Log.e(TAG, "error : ", e); // } // 注意Thread.sleep(3000)和 SystemClock.sleep(3000)的区别 SystemClock.sleep(3000); // 退出程序 Log.i("=====killProcess======","=====killProcess======"); mMyActivityLifecycleCallbacks.removeAllActivities(); android.os.Process.killProcess(android.os.Process.myPid()); System.exit(0); } } /** * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成. * * @param ex * @return true:如果处理了该异常信息;否则返回false. */ private boolean handleException(Throwable ex) { Log.i("=====handleException======","=====handleException======"); if (ex == null) { return false; } // 收集设备参数信息 collectDeviceInfo(mContext); // 使用Toast来显示异常信息 new Thread() { @Override public void run() { Looper.prepare(); Toast.makeText(mContext, "哎呀，出问题了，我要暂时离开了", Toast.LENGTH_SHORT).show(); Looper.loop(); } }.start(); // 保存日志文件 saveCatchInfo2File(ex); return true; } /** * 收集设备参数信息 * * @param ctx */ public void collectDeviceInfo(Context ctx) { try { PackageManager pm = ctx.getPackageManager(); PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES); if (pi != null) { String versionName = pi.versionName == null ? "null" : pi.versionName; String versionCode = pi.versionCode + ""; infos.put("versionName", versionName); infos.put("versionCode", versionCode); } } catch (NameNotFoundException e) { Log.e(TAG, "an error occured when collect package info", e); } Field[] fields = Build.class.getDeclaredFields(); for (Field field : fields) { try { field.setAccessible(true); infos.put(field.getName(), field.get(null).toString()); Log.d(TAG, field.getName() + " : " + field.get(null)); } catch (Exception e) { Log.e(TAG, "an error occured when collect crash info", e); } } } /** * 保存错误信息到文件中 * * @param ex * @return 返回文件名称,便于将文件传送到服务器 */ private String saveCatchInfo2File(Throwable ex) { StringBuffer sb = new StringBuffer(); for (Map.Entry<String, String> entry : infos.entrySet()) { String key = entry.getKey(); String value = entry.getValue(); sb.append(key + "=" + value + "\n"); } Writer writer = new StringWriter(); PrintWriter printWriter = new PrintWriter(writer); ex.printStackTrace(printWriter); Throwable cause = ex.getCause(); while (cause != null) { cause.printStackTrace(printWriter); cause = cause.getCause(); } printWriter.close(); String result = writer.toString(); sb.append(result); try { long timestamp = System.currentTimeMillis(); String time = formatter.format(new Date()); SharedPreferences userInfo = mContext.getSharedPreferences( Constants.USER_SETTING_INFOS, 0); String loginName = userInfo.getString(Constants.USERNAME, ""); String fileName = "crash-" + time +"-"+loginName+ ".log"; if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { String path = "/mnt/sdcard/crash/"; File dir = new File(path); if (!dir.exists()) { dir.mkdirs(); } FileOutputStream fos = new FileOutputStream(path + fileName); fos.write(sb.toString().getBytes()); // 发送给开发人员 sendCrashLog2PM(path + fileName); fos.close(); } return fileName; } catch (Exception e) { Log.e(TAG, "an error occured while writing file...", e); } return null; } /** * 将捕获的导致崩溃的错误信息发送给开发人员 * * 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。 */ private void sendCrashLog2PM(final String fileName) { if (!new File(fileName).exists()) { Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show(); return; } else { new Thread(new Runnable() { @Override public void run() { Looper.prepare(); ArrayList<String> picList = new ArrayList<String>(); picList.add(fileName); SendEventPic sFile = new SendEventPic(mContext); UUIDGenerator generator = new UUIDGenerator(); String linkId = generator.generate().toString(); SharedPreferences userInfo = mContext.getSharedPreferences( Constants.USER_SETTING_INFOS, 0); String loginName = userInfo.getString(Constants.USERNAME, ""); String userId = userInfo.getString(Constants.USER_USERID_INFOS, ""); boolean isproblempic = sFile.isSendSuccess(picList, linkId, "crash_tng", "crash_tng", loginName, userId); Looper.loop(); } }).start(); } FileInputStream fis = null; BufferedReader reader = null; String s = null; try { fis = new FileInputStream(fileName); reader = new BufferedReader(new InputStreamReader(fis, "GBK")); while (true) { s = reader.readLine(); if (s == null) break; // 由于目前尚未确定以何种方式发送，所以先打出log日志。 Log.i("info", s.toString()); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { // 关闭流 try { reader.close(); fis.close(); } catch (IOException e) { e.printStackTrace(); } } } }
三、开发过程中遇到的坑
如果在activity创建的时候崩溃的话，系统有时候（目前不确定什么情况下会重启）会重启当前的activity，造成第二次的崩溃，如此循环……
所以，在应用崩溃时要完全退出应用。
public class MyActivityLifecycleCallbacks implements ActivityLifecycleCallbacks { private List<Activity> activities = new LinkedList<>(); public static int sAnimationId = 0; @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) { addActivity(activity); } @Override public void onActivityStarted(Activity activity) { } @Override public void onActivityResumed(Activity activity) { } @Override public void onActivityPaused(Activity activity) { } @Override public void onActivityStopped(Activity activity) { } @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) { } @Override public void onActivityDestroyed(Activity activity) { removeActivity(activity); } /** * 添加Activity */ public void addActivity(Activity activity) { if (activities == null) { activities = new LinkedList<>(); } if (!activities.contains(activity)) { activities.add(activity);// 把当前Activity添加到集合中 } } /** * 移除Activity */ public void removeActivity(Activity activity) { if (activities.contains(activity)) { activities.remove(activity); } if (activities.size() == 0) { activities = null; } } /** * 销毁所有activity */ public void removeAllActivities() { for (Activity activity : activities) { if (null != activity) { activity.finish(); activity.overridePendingTransition(0, sAnimationId); } } } }
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。