Android 收集程序崩溃日志，保存本地

				**Android 收集程序崩溃日志，保存本地。**

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//记得动态添加sd卡读写权限

public class CrashHandler implements Thread.UncaughtExceptionHandler {
    public static final String TAG = "CrashHandler";
    String crashHead;
    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map infos = new HashMap();

    // 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");
    private String nameString = "xxcrashlog";

    /** 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);
    }

    /**
     * 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);
            }
            // 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;
        }
        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(mContext, "很抱歉,程序出现异常,正在收集日志，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
        String fileName = saveCrashInfo2File(ex);
//        restartApp();
        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);
                 crashHead = "\n************* Crash Log Head ****************" +
                        "\nDevice Manufacturer: " + Build.MANUFACTURER +// 设备厂商
                        "\nDevice Model       : " + Build.MODEL +// 设备型号
                        "\nAndroid Version    : " + Build.VERSION.RELEASE +// 系统版本
                        "\nAndroid SDK        : " + Build.VERSION.SDK_INT +// SDK版本
                        "\nApp VersionName    : " + versionName +
                        "\nApp VersionCode    : " + versionCode +
                        "\n************* Crash Log Head ****************\n\n";
            }


        } catch (PackageManager.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 saveCrashInfo2File(Throwable ex) {

        StringBuffer sb = new StringBuffer();
        sb.append(crashHead);
        for (Map.Entry 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());
            String fileName = nameString + "-" + time + "-" + timestamp
                    + ".log";
            if (Environment.getExternalStorageState().equals(
                    Environment.MEDIA_MOUNTED)) {
                String path = APP_FILE_PATH;//日志保存目录
                File dir = new File("");
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return null;
    }

    private void restartApp(){
        Intent intent = new Intent(mContext.getApplicationContext(), XiaoxiaoMainActivity.class);
        AlarmManager mAlarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
        //重启应用，得使用PendingIntent
        PendingIntent restartIntent = PendingIntent.getActivity(
                mContext.getApplicationContext(), 0, intent,
                Intent.FLAG_ACTIVITY_NEW_TASK);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            //Android6.0以上，包含6.0
            mAlarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC, System.currentTimeMillis() + 1000, restartIntent); //解决Android6.0省电机制带来的不准时问题
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            //Android4.4到Android6.0之间，包含4.4
            mAlarmManager.setExact(AlarmManager.RTC, System.currentTimeMillis() + 1000, restartIntent); // 解决set()在api19上不准时问题
        } else {
            mAlarmManager.set(AlarmManager.RTC, System.currentTimeMillis() + 1000, restartIntent);
        }
    }
}

只需要在程序启动的时候调用即可，还需要添加日志保存的目录

 CrashHandler crashHandler = CrashHandler.getInstance();
        crashHandler.init(this);