Regarding the assets folder and environment variables on android

问题

My code reads

package com.fyp.jwi;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import edu.mit.jwi.Dictionary;
import edu.mit.jwi.IDictionary;
import edu.mit.jwi.item.IIndexWord;
import edu.mit.jwi.item.IWord;
import edu.mit.jwi.item.IWordID;
import edu.mit.jwi.item.POS;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ---->  String wnhome = "file:///android_asset/";   <----
     String path = wnhome + File.separator + " dict ";
     URL url = null;
     try{ url = new URL("file", null, path); } 
          catch(MalformedURLException e){ try {
            e.printStackTrace();
        } catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } }
          if(url == null) return;

     // construct the dictionary object and open it
     IDictionary dict = new Dictionary ( url);
     try {
        dict.open ();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

     // look up first sense of the word "dog "
     IIndexWord idxWord = dict . getIndexWord ("dog", POS. NOUN );
     IWordID wordID = idxWord . getWordIDs ().get (0) ;
     IWord word = dict . getWord ( wordID );
     System .out . println ("Id = " + wordID );
     System .out . println (" Lemma = " + word . getLemma ());
     System .out . println (" Gloss = " + word . getSynset (). getGloss ());
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

The code which I have highlighted using the '-->' was originally

String wnhome = System.getenv("WNHOME");

Where WNHOME is an environment variable that refers to the directory where certain files to help a Java wordnet api are located on your computer. This works fine when I compile the code. I need a standalone Java program on my pc.

I have attached an image to make things clearer

Now I know how to set and use environment variables on windows. How to do it on android? And am I bundling these files the right way? Is there another way to do it?

OR is there a workaround that doesn't involve setting an environment variable? Anyone familiar with this or the JWI help me out ?

来源：https://stackoverflow.com/questions/21642596/regarding-the-assets-folder-and-environment-variables-on-android

标签

java

android

wordnet

jwi