title: PNG transparent backgrounds appearing black when using Android Studio
body: <p>The social icons below (for fb, twitter, mail and share) are circular PNGs with transparent backgrounds. When I use the code and exact same images in Eclipse, I get transparent background but when build and run with Android Studio,  I get black backgrounds. See details below.</p>
  
  <p>Images are the same. Code used in layout xml files:</p>
  
  <pre><code> &lt;LinearLayout
                  android:id="@+id/ll_shareBtns"
                  android:layout_width="@dimen/sharesection_width"
                  android:layout_height="@dimen/sharesection_height"
                  android:layout_gravity="center"
                  android:background="@drawable/bg_sharebox"
                  android:gravity="center"
                  android:orientation="horizontal" &gt;
  
                  &lt;Button
                      android:id="@+id/btn_facebook"
                      android:layout_width="@dimen/dimens_sharebtns"
                      android:layout_height="@dimen/dimens_sharebtns"
                      android:layout_marginLeft="@dimen/sharebtns_leftmargin"
                      android:layout_marginRight="@dimen/sharebtns_rightmargin"
                      android:background="@drawable/bg_facebookbtn"
                      android:gravity="center" /&gt;
  
                  &lt;Button
                      android:id="@+id/btn_twitter"
                      android:layout_width="@dimen/dimens_sharebtns"
                      android:layout_height="@dimen/dimens_sharebtns"
                      android:layout_marginLeft="@dimen/sharebtns_leftmargin"
                      android:layout_marginRight="@dimen/sharebtns_rightmargin"
                      android:background="@drawable/bg_twitterbtn"
                      android:gravity="center" /&gt;
  
                  &lt;Button
                      android:id="@+id/btn_email"
                      android:layout_width="@dimen/dimens_sharebtns"
                      android:layout_height="@dimen/dimens_sharebtns"
                      android:layout_marginLeft="@dimen/sharebtns_leftmargin"
                      android:layout_marginRight="@dimen/sharebtns_rightmargin"
                      android:background="@drawable/bg_emailbtn"
                      android:gravity="center" /&gt;
  
                  &lt;Button
                      android:id="@+id/btn_share"
                      android:layout_width="@dimen/dimens_sharebtns"
                      android:layout_height="@dimen/dimens_sharebtns"
                      android:layout_marginLeft="@dimen/sharebtns_leftmargin"
                      android:layout_marginRight="@dimen/sharebtns_rightmargin"
                      android:background="@drawable/bg_sharebtn"
                      android:gravity="center" /&gt;
              &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>When code compiled and run with Android Studio, I see this:
  <img src="https://i.stack.imgur.com/Jwqis.png" alt="enter image description here"></p>
  
  <p>When code is compiled and run with Eclipse, I see this:</p>
  
  <p><img src="https://i.stack.imgur.com/Bq9mD.png" alt="enter image description here"></p>
  
  <p>Quite Strange. Could difference in build tools version cause this problem too?</p>