FoxInSox

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

    TextView textView = (TextView) findViewById(R.id.textView);

    File sdCard = Environment.getExternalStorageDirectory();
    File[] list = sdCard.listFiles();

    for (File f : list) {
	    String fileAbsPath = f.getAbsolutePath().toString();
	    fileAbsPath = fileAbsPath.replaceAll("[^\\x20-\\x7e]", "");
	    textView.append(fileAbsPath);
	    textView.append("\n");
    }

    textView.append("\n");

    for (File f : list) {
	    String fileAbsPath = f.getAbsolutePath().toString();
	    textView.append(fileAbsPath);
	    textView.append("\n");
    }
}

import gnu.jel.CompilationException;
import gnu.jel.CompiledExpression;
import gnu.jel.Evaluator;
import gnu.jel.Library;

public class Main {

	private static final String EVAL_VALUE = "3243-854+6-100";

	public static void main(String[] args){
		JELSample();
	}

	private static void JELSample(){

		try {
			Class[] staticLib = new Class[1];
			staticLib[0] = Class.forName("java.lang.Math");
			Library lib = new Library(staticLib, null, null, null, null);
			CompiledExpression compiledExpression = Evaluator.compile(EVAL_VALUE, lib);
			Object result = compiledExpression.evaluate(null);
			System.out.println("JEL: " + result);
		} catch (CompilationException e) {
			e.printStackTrace();
		} catch (Throwable throwable) {
			throwable.printStackTrace();
		}
	}
}