Loading view popup in Android

layoutandresources.xml

<!-- layout file for loading view : indeterminate_progress.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:background="@color/progress_popup_background" >

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

<!-- colors.xml -->
<resources>
    <!-- first two numbers are alpha channel to make the popup slightly transparent -->
    <color name="progress_popup_background">#80eeeeee</color>
</resources>

SomeActivity.java

public class SomeActivity extends Activity {
  // make it a field so we can dismiss it when the activity pauses.
  // otherwise the window will leak and cause and exception when the activity no longer exists
  private PopupWindow mPopup;

  public void showPopup() {
    View popupView = ((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.indeterminate_progress, null);
    Display display = getWindowManager().getDefaultDisplay();
    // getWidth() and getHeight() are deprecated and we should use getSize() but it's available on API level 13 and up
    mPopup = new PopupWindow(popupView, display.getWidth(), display.getHeight());
    // rootView here is the root view of the activity's layout
    mPopup.showAtLocation(findViewById(R.id.rootView), Gravity.CENTER, 0, 0);
  }
}