can't call String.isEmpty() in android
<p>In my android application I can't use <strong><em>String.isEmpty()</em></strong> function which is situated in JDK 1.6. Android 2.1 lib doesn't have this function in java.lang.String class</p>

<p>I tried to input JRE System library to my project, because it has this function, but there was no effects.</p>

<p>How can I solve this problem and allow my application to use this function?</p>
