public class MainActivity extends Activity {
 
    private static String[] DEX_FILES = {"dexter.dex"};
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        try {
            for (String dex : DEX_FILES)
                Dexter.loadFromAssets(this, dex);
        } catch (Exception e) {
            throw new RuntimeException("Unable to load DEX files", e);
        }
 
        try {
            startActivity(new Intent(MainActivity.this, getClassLoader().loadClass("the real activity")));
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("Unable to start application", e);
        }
    }
}