0. 前言
无论是多么完美的应用，总会有Crash的时候，那么收集应用的Crash信息到服务器对开发人员修补BUG来说尤为重要。
本文原创，转载请注明出处为SEU_Calvin的博客。
1. 实现原理
我们可以自定义我们的CrashHandler类，并实现UncaughtExceptionHandler的接口，然后重写uncaughtException方法，再将我们的CrashHandler类设置为默认的异常处理器，就可以完成在某个异常没有被我们catch的时候，回调我们的uncaughtException方法，并在其中完成崩溃信息的获取和上传服务器的逻辑。
2. 实现细节
public class CrashHandler implements UncaughtExceptionHandler {private static final String PATH = Environment.getExternalStorageDirectory().getPath() + "/CrashTest/log/";private static final String FILE_NAME = "crash";private static final String FILE_NAME_SUFFIX = ".trace";/**By SEU_Calvin 17/5/14*通过单例模式提供我们的CrashHandler实例*/private static CrashHandler sInstance = new CrashHandler();private CrashHandler() {}public static CrashHandler getInstance() {return sInstance;}/**By SEU_Calvin 17/05/14 *外界通过init传入上下文，*/private UncaughtExceptionHandler mDefaultCrashHandler;private Context mContext;public void init(Context context) {mDefaultCrashHandler = Thread.getDefaultUncaughtExceptionHandler();//设置默认异常处理器为thisThread.setDefaultUncaughtExceptionHandler(this);mContext = context.getApplicationContext();}@Overridepublic void uncaughtException(Thread thread, Throwable ex) {try {//导出异常信息到SD卡中dumpExceptionToSDCard(ex);//通过网络上传异常信息到服务器，逻辑略} catch (IOException e) {e.printStackTrace();}/**By SEU_Calvin 17/05/14*最后的逻辑，若系统提供了默认的异常处理器，则交给系统去结束我们的应用*否则自杀*/if (mDefaultCrashHandler != null) {mDefaultCrashHandler.uncaughtException(thread, ex);} else {Process.killProcess(Process.myPid());}}/**By SEU_Calvin 17/05/14 *该方法收集异常信息到SD卡*/private void dumpExceptionToSDCard(Throwable ex) throws IOException {if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {Log.w(TAG, "sdcard unmounted,skip dump exception");return;}File dir = new File(PATH);if (!dir.exists()) {dir.mkdirs();}long current = System.currentTimeMillis();String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(current));File file = new File(PATH + FILE_NAME + time + FILE_NAME_SUFFIX);try {PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(file)));pw.println(time);dumpPhoneInfo(pw);pw.println();ex.printStackTrace(pw);pw.close();} catch (Exception e) {Log.e(TAG, "dump crash info failed");}}/**By SEU_Calvin 17/05/14 *收集设备信息*/private void dumpPhoneInfo(PrintWriter pw) throws NameNotFoundException {PackageManager pm = mContext.getPackageManager();PackageInfo pi = pm.getPackageInfo(mContext.getPackageName(), PackageManager.GET_ACTIVITIES);pw.print("App Version: ");pw.print(pi.versionName);pw.print('_');pw.println(pi.versionCode);//android版本号pw.print("OS Version: ");pw.print(Build.VERSION.RELEASE);pw.print("_");pw.println(Build.VERSION.SDK_INT);//手机制造商pw.print("Vendor: ");pw.println(Build.MANUFACTURER);//手机型号pw.print("Model: ");pw.println(Build.MODEL);//cpu架构pw.print("CPU ABI: ");pw.println(Build.CPU_ABI);}
}
上面的代码逻辑参考注释，比较简单，这里就不赘述了，最后在使用我们的CrashHandler时，只需要在Application初始化的时候配置我们的CrashHandler即可。
public class TestApp extends Application {private static TestApp sInstance;@Overridepublic void onCreate() {super.onCreate();sInstance = this;//为应用设置我们的异常处理器CrashHandler crashHandler = CrashHandler.getInstance();crashHandler.init(this);}public static TestApp getInstance() {return sInstance;}
}