Android import package error
<p>I was trying to import some android packages, 
for example:</p>

<pre><code> import android.os.Tools; 

 import android.os.SystemProperties;
</code></pre>

<p>I found errors occured because these packages have to be built up with the entire system.</p>

<p>However, can anyone tell me how to do it and correct me if my understanding is incorrect.</p>

<p>Thanks</p>
