我有一个包含折叠appbar布局的片段。按下此片段的按钮将会显示。我想要的是在显示片段后,appbar会以默认动画展开。
显示片段:
FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
descripnFragment = new DescripnFragment();
fragmentTransaction.add(R.id.frame_decription, descripnFragment, "descriptionFragment").commit();
getFragmentManager().executePendingTransactions();
Fragment OnCreateView:
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.description_fragment, container, false);
appBarLayout = (AppBarLayout) view.findViewById(R.id.app_bar);
appBarLayout.setExpanded(false);
return view;
}
Fragment OnResume:
@Override
public void onResume() {
appBarLayout.setExpanded(true, true);
super.onResume();
}
但它只是扩展而没有动画。我该怎么办?
更新: 这是我的片段xml:
<?xml version="1.0" encoding="utf-8"?><com.faranegar.channelapp.entity.DisableableCoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activity.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar"
android:layout_width="match_parent"
android:layout_height="@dimen/expanded_toolbar_height"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="start"
android:background="?attr/colorPrimary"
android:gravity="center"
app:layout_collapseMode="pin"/>
<com.sloydev.collapsingavatartoolbar.CollapsingAvatarToolbar
android:layout_width="wrap_content"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="start"
android:gravity="start">
<ImageView
android:id="@+id/cat_avatar"
android:layout_width="?attr/actionBarSize"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="center_vertical"
android:scaleType="centerCrop"
android:src="@drawable/logo"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:layout_marginLeft="20dp"
android:layout_marginTop="10dp"
android:layout_toRightOf="@id/cat_avatar"
android:orientation="vertical">
<TextView
android:id="@+id/cat_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="فرانگر | یک راه ساده تر"
android:textColor="#fff"
android:textDirection="rtl"
android:textSize="15sp"/>
<TextView
android:id="@+id/subtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/cat_title"
android:text=""
android:textColor="#e1e1e1"/>
</LinearLayout>
</com.sloydev.collapsingavatartoolbar.CollapsingAvatarToolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
...
</android.support.v4.widget.NestedScrollView>