android全局异常日志记录

在很多时候在自己调试环境中很容易定位BUG找到问题，但是上线后产品出了问题没有环境是很烦恼的，所用添加异常日志记录就大大的方便了自己，这里是一个简单的异常日志记录可定时删除。最后DEMO附上

首先我们要用到两个类和一个调用页面

第一个类：当程序发生Uncaught异常的时候，该类来接管程序，并且记录错误的日志

public class CrashHandler implements UncaughtExceptionHandler {public static String TAG = "MyCrash";// 系统默认的UncaughtException处理类private Thread.UncaughtExceptionHandler mDefaultHandler;private static CrashHandler instance = new CrashHandler();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");/** 保证只有一个CrashHandler实例 */private CrashHandler() {}/** 获取CrashHandler实例 ,单例模式 */public static CrashHandler getInstance() {return instance;}/*** 初始化* * @param context*/public void init(Context context) {mContext = context;// 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);autoClear(5);}/*** 当UncaughtException发生时会转入该函数来处理*/@Overridepublic 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 {SystemClock.sleep(3000);// 退出程序android.os.Process.killProcess(android.os.Process.myPid());System.exit(1);}}/*** 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) {if (ex == null)return false;try {// 使用Toast来显示异常信息new Thread() {@Overridepublic void run() {Looper.prepare();Toast.makeText(mContext, "很抱歉,程序出现异常,即将重启.",Toast.LENGTH_LONG).show();Looper.loop();}}.start();// 收集设备参数信息collectDeviceInfo(mContext);// 保存日志文件saveCrashInfoFile(ex);// 重启应用（按需要添加是否重启应用）// Intent intent = mContext.getPackageManager().getLaunchIntentForPackage(mContext.getPackageName()); // intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // mContext.startActivity(intent);SystemClock.sleep(3000);} catch (Exception e) {e.printStackTrace();}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 + "";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());} 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* @throws Exception*/private String saveCrashInfoFile(Throwable ex) throws Exception {StringBuffer sb = new StringBuffer();try {SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String date = sDateFormat.format(new java.util.Date());sb.append("\r\n" + date + "\n");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.flush();printWriter.close();String result = writer.toString();sb.append(result);String fileName = writeFile(sb.toString());return fileName;} catch (Exception e) {Log.e(TAG, "an error occured while writing file...", e);sb.append("an error occured while writing file...\r\n");writeFile(sb.toString());}return null;}private String writeFile(String sb) throws Exception {String time = formatter.format(new Date());String fileName = "crash-" + time + ".log";if (FileUtil.hasSdcard()) {String path = getGlobalpath();File dir = new File(path);if (!dir.exists())dir.mkdirs();FileOutputStream fos = new FileOutputStream(path + fileName, true);fos.write(sb.getBytes());fos.flush();fos.close();}return fileName;}public static String getGlobalpath() {return Environment.getExternalStorageDirectory().getAbsolutePath()+ File.separator + "crash" + File.separator;}public static void setTag(String tag) {TAG = tag;}/*** 文件删除* @param day 文件保存天数*/public void autoClear(final int autoClearDay) {FileUtil.delete(getGlobalpath(), new FilenameFilter() {@Overridepublic boolean accept(File file, String filename) {String s = FileUtil.getFileNameWithoutExtension(filename);int day = autoClearDay < 0 ? autoClearDay : -1 * autoClearDay;String date = "crash-" + DateUtil.getOtherDay(day);return pareTo(s) >= 0;}});}

第二个类就是我们的Application

public class MyAppcation extends Application{@Overridepublic void onCreate() {super.onCreate();CrashHandler.getInstance().init(this);//这里做初始化动作}}

主要代码就是这么多，

在注册清单中也需要加代码

就是红框中这一句不能少

最后就是主页面我们模拟一个未实例化的文本控件

public class MainActivity extends Activity {private TextView tv;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);findViewById(R.id.ex_btn).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {tv.setText("我没初始化哦");}});}

当触发按钮后，异常产生，3秒后自动退出程序。

然后找到日志文件查看日志信息

这样就查看到了异常信息

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