title: remove white background in dialogfragment
body: <p>Here's how I called my DialogFragment:</p>
  
  <pre><code>DialogSelectAccount myDiag=new DialogSelectAccount();
  myDiag.show(ft,"Diag" );
  </code></pre>
  
  <p>Here's how (partially) my DialogFragment is created: </p>
  
  <pre><code>public class DialogSelectAccount extends DialogFragment {
  public DialogSelectAccount() {
  
      }
  
  @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setRetainInstance(true);
   }
  
  @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
          View rootView = inflater.inflate(R.layout.dialog_select_account, container, false);
  tvMessage = (TextView) rootView.findViewById(R.id.tvMessage);
          btnAccountPublic = (Button) rootView.findViewById(R.id.btnAccountPublic);
          btnAccountEnterprise = (Button) rootView.findViewById(R.id.btnAccountEnterprise);
          tvMessage.setText(message);
          btnAccountPublic.setOnClickListener(new View.OnClickListener() {
  
              @Override
              public void onClick(View v) {
                  Login.setAccountType = 2;
                  dismiss();
              }
          });
          btnAccountEnterprise.setOnClickListener(new View.OnClickListener() {
  
              @Override
              public void onClick(View v) {
                  Login.setAccountType = 1;
                  dismiss();
              }
          });
          return rootView;
      }
  </code></pre>
  
  <p>and here's the xml for my DialogSelectAccount</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:background="#ff26b4e9"
      android:orientation="vertical" &gt;
  
      &lt;TextView
          android:id="@+id/tvMessage"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="center"
          android:layout_margin="10dp"
          android:textColor="@android:color/black"
          android:textSize="15dp"
          android:textAlignment="center"
          android:gravity="center_horizontal"
          android:background="#ff26b4e9"
          android:autoText="true"&gt;
      &lt;/TextView&gt;
  
      &lt;LinearLayout
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="center"
          android:background="#ff26b4e9"
          android:orientation="horizontal" &gt;
  
          &lt;Button
              android:id="@+id/btnAccountPublic"
              android:layout_width="150dp"
              android:layout_height="wrap_content"
              android:clickable="true"
              android:text="@string/accountPub"
              android:textColor="#ffffffff"
              android:background = "@drawable/roundedbutton" /&gt;
  
          &lt;Button
              android:id="@+id/btnAccountEnterprise"
              android:layout_width="150dp"
              android:layout_height="wrap_content"
              android:layout_marginLeft="5dp"
              android:clickable="true"
              android:text="@string/accountEnt"
              android:textColor="#ffffffff"
              android:background = "@drawable/roundedbutton" /&gt;
      &lt;/LinearLayout&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>the problem is there's always an innoying white background displayed, as shown below. How do I remove it?</p>
  
  <p><img src="https://i.stack.imgur.com/gfo3j.png" alt="enter image description here"></p>