Android Open Source - base-android-utils App Install Util

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License

The source code is released under:

Apache License

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Java Source Code

/**   
 * @Title: Installation.java /*from ww w. j  a  va 2  s .com*/
 * @Package me.pc.mobile.helper.v14.util 
 * @Description: TODO
 * @author SilentKnight || happychinapc[at]gmail[dot]com   
 * @date 2014 2014?12?30? ????4:02:35 
 * @version V1.0.0   
 */
package me.pc.mobile.helper.v14.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.UUID;

import android.content.Context;

/**
 * @ClassName: AppInstallUtil
 * @Description: TODO
 * @author SilentKnight || happychinapc@gmail.com
 * @date 2014?12?30? ????4:02:35
 * 
 */
public final class AppInstallUtil {
  private static String sID = null;
  private static final String INSTALLATION = "app_installation_identifier";

  public synchronized static String id(Context context) {
    if (sID == null) {
      File installation = new File(context.getFilesDir(), INSTALLATION);
      try {
        if (!installation.exists()) {
          writeInstallationFile(installation);
        }
        sID = readInstallationFile(installation);
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
    return sID;
  }

  private static String readInstallationFile(File installation)
      throws IOException {
    RandomAccessFile f = new RandomAccessFile(installation, "r");
    byte[] bytes = new byte[(int) f.length()];
    f.readFully(bytes);
    f.close();
    return new String(bytes);
  }

  private static void writeInstallationFile(File installation)
      throws IOException {
    FileOutputStream out = new FileOutputStream(installation);
    String id = UUID.randomUUID().toString();
    out.write(id.getBytes());
    out.close();
  }
}

Java Source Code List