Android Open Source - appsensor Utils

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License

The source code is released under:

GNU General Public License

Java Source Code

package de.dfki.appsensor.utils;
//from  w w w . ja v a  2  s.c  o m
import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Calendar;
import java.util.List;

import android.content.Context;
import android.util.Log;

/**
 * This class provides some technical utilities, e.g. for logging, as well as
 * constants, e.g. for setting defaults.
 * 
 * @author Matthias Boehmer, matthias.boehmer@dfki.de
 */
public class Utils {

  /** tag for logging output */
  public static final String TAG = "appsensor";

  /** names of the settings **/
  public static final String PREFS_NAME = "user_conditions";
  public static final String DISCLAIMER_ACK = "disclaimer_acknowledge";
  public static final String SETTINGS_INSTALLATIONID_NAME = "settings_id";
  public static final String SETTINGS_DEVICEID_NAME = "settings_deviceid";
  public static final String SETTINGS_settings_sensorsactive = "settings_sensorsactive";
  public static final String SETTINGS_settings_sensorsamplingrate = "settings_sensorsamplingrate";
  public static final String SETTINGS_settings_serverip = "settings_serverip";
  public static final String SETTINGS_settings_serverport = "settings_serverport";
  public static final String SETTINGS_settings_syncwifionly = "settings_syncwifionly";
  public static final String SETTINGS_settings_syncrate = "settings_syncrate";
  public static final int SETTINGS_settings_syncrate_default = 360;
  public static final int SETTINGS_settings_sensorsamplingrate_default = 500;
  public static final boolean SETTINGS_settings_syncwifionly_default = false;
  public static final boolean SETTINGS_settings_sensorsactive_default = true;

  /**
   * debugging output, e.g. to enable on-screen debug notifications and
   * logging output
   */
  public static final boolean D = false;

  /** charset for communication with the server */
  public static final String CHARSET = "UTF-8";

  /**
   * this is the default value of the old style ID if we cannot get it from
   * the API
   */
  public static final String DEFAULT_DEVICE_ID = "unknownDeviceID";

  /**
   * returns timestamp in UTC milliseconds
   * 
   * @return
   */
  public static long getCurrentTime() {
    return System.currentTimeMillis();
  }

  private static int offsetUTC = 0;
  private static boolean offsetUTCset = false;

  /**
   * get offset to UTC in seconds
   * 
   * @return
   */
  public synchronized static int utcOFF() {
    if (offsetUTCset) {
      return offsetUTC;
    } else {
      offsetUTC = Calendar.getInstance().getTimeZone().getRawOffset()
          / (1000 * 3600);
      offsetUTCset = true;
      return offsetUTC;
    }
  }

  public static void d(Object o, String msg) {
    if (Utils.D) {
      if (o != null) {
        Log.d(o.getClass().getSimpleName(), msg);
      } else {
        Log.d(TAG, "NULL : " + msg);
      }
    }
  }

  public static void e(Object o, String msg) {
    if (Utils.D)
      Log.d(TAG, o.getClass().getSimpleName() + ": " + msg);
  }

  /**
   * @param o
   * @param msg
   */
  public static void d2(Object o, String msg) {
    if (Utils.D) {
      Log.d(TAG, o.getClass().getSimpleName() + ": " + msg);
    }
  }

  /**
   * prints debug output to log as well as toasting it
   * 
   * @param o
   * @param msg
   */
  public static void dToast(Context o, String msg) {
    if (Utils.D) {
      UIUtils.shortToast(o, msg);
      Log.e(TAG, "___TOAST___" + o.getClass().getSimpleName() + ": "
          + msg);
    }
  }

  public static void dToast(String msg) {
    if (Utils.D) {
      dToast(App.getAppContext(), msg);
    }
  }

  public static Object getLastOfList(List<?> l) {
    final int s = l.size();
    if (s == 0)
      return null;
    return l.get(s - 1);
  }

  public static Object getNLastOfList(List<?> l, int n) {
    final int s = l.size();
    if (s == 0)
      return null;
    return l.get(s - n - 1);
  }

  /**
   * Generates a md5 Hash of the string that's given
   * 
   * @param s
   *            string to hash
   * @return md5 Hash or if error null
   */
  public static String md5(String s) {
    if (s == null) {
      e(null, "s == null");
      return null;
    }
    try {
      MessageDigest digest = MessageDigest.getInstance("MD5");
      digest.update(s.getBytes());
      byte messageDigest[] = digest.digest();

      StringBuffer hexString = new StringBuffer();
      for (int i = 0; i < messageDigest.length; i++) {
        hexString.append(Integer.toHexString(0xFF & messageDigest[i]));
      }
      return hexString.toString();
    } catch (NoSuchAlgorithmException e) {
      e(null, "md5 NoSuchAlgorithmException: " + e.getMessage());
    } catch (NullPointerException e) {
      e(null, " md5 NullPointerException: " + e.getMessage());
    }
    e(null, " md5 sthg wrong...");

    return null;
  }

  public static void copyStream(InputStream is, OutputStream os) {
    final int buffer_size = 1024;
    Utils.d(Utils.class, "copying stream from is to os");
    try {
      byte[] bytes = new byte[buffer_size];
      for (;;) {
        int count = is.read(bytes, 0, buffer_size);
        if (count == -1)
          break;
        os.write(bytes, 0, count);
      }
    } catch (Exception ex) {
      Utils.e(Utils.class, ex.getLocalizedMessage());
    }
  }
}

Java Source Code List

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