DexHelper.java

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package jarmos.app.io;

import jarmos.app.Const;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.content.Context;
import android.util.Log;
import dalvik.system.DexClassLoader;

public class DexHelper {

    private Context c;

    private String lastFile = null;

    public DexHelper(Context c) {
        this.c = c;
    }

    public ClassLoader getDexClassLoader(InputStream in) {
        // Create a local copy for dex optimization needs write access
        String file = "tmpdex" + System.currentTimeMillis() + ".jar";
        Log.d("DexHelper", "Using temporary dex-jarfile " + file);
        try {
            if (lastFile != null)
                c.deleteFile(lastFile);

            String[] files = c.fileList();
            System.out.println(files);
            FileOutputStream f = c.openFileOutput(file, Context.MODE_WORLD_READABLE);

            byte[] buffer = new byte[1024];
            int len1 = 0;
            while ((len1 = in.read(buffer)) > 0) {
                f.write(buffer, 0, len1);
            }
            in.close();
            Log.d("DexHelper", "Finished preparing local copy of jar-file input stream" + file);
        } catch (IOException e) {
            Log.e("DexHelper", "I/O exception while preparing local copy of jar-file input stream", e);
        }
        lastFile = file;
        return new DexClassLoader(Const.APP_DATA_DIRECTORY + "/" + file, Const.APP_DATA_DIRECTORY, null,
                c.getClassLoader());
    }

    @Override
    protected void finalize() throws Throwable {
        if (lastFile != null)
            c.deleteFile(lastFile);
        super.finalize();
    }

}