java - Flipping to next screen shows black color in background -


in vertical flip effect,when flip next screen background shows black color happens in gt_n7100 mobile...how fix problem???can please me...

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@android:color/white" android:orientation="vertical"

>

<imageview     android:id="@+id/bar"     android:layout_width="480dp"     android:layout_height="1dp"     android:layout_margintop="36dp"     android:scaletype="fitxy"     android:src="@drawable/line" />  <textview     android:id="@+id/title"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_below="@+id/bar"     android:layout_margin="5dp"     android:textappearance="@android:style/textappearance.medium"     android:textcolor="@android:color/black"     android:textsize="20sp"     android:textstyle="bold"     />  <imageview     android:id="@+id/photo"     android:layout_width="fill_parent"     android:layout_height="330dp"     android:layout_below="@+id/title"     android:layout_gravity="center_horizontal"     android:layout_margin="5dp"     android:layout_margintop="5dp"      android:scaletype="centercrop" />

if performing heavy task on main thread in oncreate() method, might block oncreate() ui; avoid issue can run separate thread task. 

   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_splace_layout);     mcontext = this;     thread th = new thread(new runnable() {         @override         public void run() {             // todo auto-generated method stub             try {                 mtask();             } catch (exception e) {                 // todo: handle exception             }         }     });     th.start(); }

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