Parse Resource ID in the export Android jar

example.java

public class LibraryActivity extends Activity {

	private String msg = "hello";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(ParseResourceID.getIdByName(getApplication(), "layout", "activity_main"));
		
		TextView mTextView = (TextView) findViewById(ParseResourceID.getIdByName(getApplication(), "id", "textView1"));
		mTextView.setText(msg);
		
		Button mButton = (Button) findViewById(ParseResourceID.getIdByName(getApplication(), "id", "button1"));
		
		mButton.setText(msg);
		mButton.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(getApplication(), msg, Toast.LENGTH_SHORT).show();
			}
		});
	}

ParseResourceID.java

public class ParseResourceID {

	public static int getIdByName(Context context, String className, String name) {
		String packageName = context.getPackageName();
		Class r = null;
		int id = 0;
		try {
			r = Class.forName(packageName + ".R");

			Class[] classes = r.getClasses();
			Class desireClass = null;

			for (int i = 0; i < classes.length; ++i) {
				if (classes[i].getName().split("\\$")[1].equals(className)) {
					desireClass = classes[i];
					break;
				}
			}

			if (desireClass != null)
				id = desireClass.getField(name).getInt(desireClass);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (NoSuchFieldException e) {
			e.printStackTrace();
		}

		return id;
	}
	
	public static int[] getIdsByName(Context context, String className, String name) {
    String packageName = context.getPackageName();
    Class r = null;
    int[] ids = null;
    try {
      r = Class.forName(packageName + ".R");

      Class[] classes = r.getClasses();
      Class desireClass = null;

      for (int i = 0; i < classes.length; ++i) {
        if (classes[i].getName().split("\\$")[1].equals(className)) {
          desireClass = classes[i];
          break;
        }
      }

      if ((desireClass != null) && (desireClass.getField(name).get(desireClass) != null) && 
          (desireClass.getField(name).get(desireClass).getClass().isArray()))
        ids = (int[])desireClass.getField(name).get(desireClass);
    }
    catch (ClassNotFoundException e) {
      e.printStackTrace();
    } catch (IllegalArgumentException e) {
      e.printStackTrace();
    } catch (SecurityException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (NoSuchFieldException e) {
      e.printStackTrace();
    }
    return ids;
  }
}