android - viewflipper add view not showing -

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this code works in project.setcontentview(a viewgroup).this view group addview(mainview),i think thats problem,but dont know how slove it

mainview = mlinflater.inflate(r.layout.playsong, null);  mflipper = (myflipper) mainview.findviewbyid(r.id.viewflipper);      protected void onpostexecute(void result) {     super.onpostexecute(result);    mflipper.removeallviews();      for(int i=0;i<listbitmap.size();i++)     {         mflipper.addview(addimageview(listbitmap.get(i)));     }      mflipper.invalidate();       mflipper.shownext(); } private view addimageview(bitmap bitmap) {      imageview imageview = new imageview(playingsongactivity.this);     imageview.setimagebitmap(bitmap);     imageview.setscaletype(imageview.scaletype.center);     return imageview; }  <cn.duole.util.myflipper    android:layout_width="fill_parent"    android:layout_height="200dip"    android:background="@android:color/white"   android:id="@+id/viewflipper"   android:layout_margintop="40dip"   android:padding="20dip"   android:layout_gravity="center_horizontal"    />

after code, viewflipper not showing @ all.please me,i dont know whats problem.addimageview(listbitmap.get(i)) right.i wonder if problem viewflipper not refreshed


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