Only import used java.io classes. Delete unused cm_strings

    <string name="default_start_title">Default view</string>

    <string name="default_start_last">Previously used view</string>

    <!-- Strings for buttons in drop down menu -->

    <string name="buttons_list_0">Day</string>

    <string name="buttons_list_1">Week</string>

    <string name="buttons_list_2">Month</string>

    <string name="buttons_list_3">Agenda</string>

    <string name="buttons_list_4">Year</string>

    <!-- Sharing calendar event -->

    <string name="cal_share_intent_title">Send event to:</string>

import android.system.OsConstants;

import com.android.calendar.CalendarEventModel;

import java.io.*;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Calendar;