Android Open Source - rfcx-guardian-android Device Guid

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Back to project page rfcx-guardian-android.

License

The source code is released under:

Apache License

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Java Source Code

package org.rfcx.guardian.utility;
/* w  w w. ja  v  a 2s.c  om*/
import android.content.Context;
import android.content.SharedPreferences;
import android.text.TextUtils;
import android.util.Log;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

public class DeviceGuid {
  
  private static final String TAG = DeviceGuid.class.getSimpleName();
  private static final String NULL_EXC = "Exception thrown, but exception itself is null.";
  protected static final String PREFS_DEVICE_GUID = "device_guid";
    protected static String deviceGuid;

    public DeviceGuid(Context context, SharedPreferences prefs) {
        if (deviceGuid == null) {
            synchronized (DeviceGuid.class) {
                if (deviceGuid == null) {
                  final String prefsDeviceGuid = prefs.getString(PREFS_DEVICE_GUID,null);
                    if ((prefsDeviceGuid != null) && (prefsDeviceGuid.length() > 10)) {
                        deviceGuid = prefsDeviceGuid;
                    } else{
                      deviceGuid = getExistingGuidFromUpdaterApp(context);
                      if (deviceGuid == null) { 
                        String randomUuid = (UUID.randomUUID()).toString();
                        deviceGuid = randomUuid.substring(1+randomUuid.lastIndexOf("-"));
                      }
                      prefs.edit().putString(PREFS_DEVICE_GUID, deviceGuid).commit();
                    }
                }
            }
        }
    }


    public String getDeviceId() {
        return deviceGuid;
    }
    
    private static String getExistingGuidFromUpdaterApp(Context context) {
      try {
        String mainAppPath = context.getFilesDir().getAbsolutePath();
        Log.d(TAG,mainAppPath.substring(0,mainAppPath.lastIndexOf("/files"))+".updater/files/device_guid.txt;");
        File guidFile = new File(mainAppPath.substring(0,mainAppPath.lastIndexOf("/files"))+".updater/files","device_guid.txt");
        if (guidFile.exists()) {
        FileInputStream input = new FileInputStream(guidFile);
        StringBuffer fileContent = new StringBuffer("");
        byte[] buffer = new byte[12];
        while (input.read(buffer) != -1) {
            fileContent.append(new String(buffer));
        }
          String guidString = fileContent.toString();
          input.close();
          Log.d(TAG, "Fetched GUID from RfcxGuardianUpdater: "+guidString);
          return guidString;
        } else {
          Log.e(TAG, "No previous GUID saved by RfcxGuardianUpdater...");
        }
      } catch (FileNotFoundException e) {
        Log.e(TAG,(e!=null) ? (e.getMessage() +" ||| "+ TextUtils.join(" | ", e.getStackTrace())) : NULL_EXC);
      } catch (IOException e) {
        Log.e(TAG,(e!=null) ? (e.getMessage() +" ||| "+ TextUtils.join(" | ", e.getStackTrace())) : NULL_EXC);
    }
      return null;
    }
}

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