package com.lcjian.library;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.util.UUID;
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import android.content.Context;
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public class Installation {
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private static String sID = null;
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private static final String INSTALLATION = "INSTALLATION";
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public synchronized static String id(Context context) {
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if (sID == null) {
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File installation = new File(context.getFilesDir(), INSTALLATION);
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try {
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if (!installation.exists())
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writeInstallationFile(installation);
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sID = readInstallationFile(installation);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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return sID;
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}
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private static String readInstallationFile(File installation) throws IOException {
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RandomAccessFile f = new RandomAccessFile(installation, "r");
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byte[] bytes = new byte[(int) f.length()];
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f.readFully(bytes);
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f.close();
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return new String(bytes);
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}
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private static void writeInstallationFile(File installation) throws IOException {
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FileOutputStream out = new FileOutputStream(installation);
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String id = UUID.randomUUID().toString();
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out.write(id.getBytes());
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out.close();
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}
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}
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