can't import android.os.SystemProperties in Camera app
<p>In camera.java, I need to get property in system. However, I can't import android.os.SystemProperties, compile camera always complains:</p>

<pre><code>packages/apps/Camera/src/com/android/camera/Camera.java:53: cannot find symbol
symbol  : class SystemProperties
location: package android.os
import android.os.SystemProperties;
</code></pre>

<p>In the beginning of camera.java, I included:</p>

<pre><code>import android.os.Message;
import android.os.MessageQueue;
import android.os.SystemClock;
import android.os.SystemProperties; /* (this is in line 53)*/
</code></pre>

<p>It seems SystemProperties is not in android.os package, but I have checked the frameworks source code, it's indeed in it.</p>

<p>This happen in camera app. I found many apps under packages/app dir using SystemProperties in this manner. It's really strange. </p>
