需要为某些片段禁用在 CollapsingToolbarLayout 上展开 [英] Need to disable expand on CollapsingToolbarLayout for certain fragments
问题描述
我有一个 AppCompatActivity 来控制替换许多片段.这是我的布局.
I have a AppCompatActivity that controls replacing many fragments. Here is my layout for it.
activity_main.xml
activity_main.xml
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:fitsSystemWindows="true">
<include layout="@layout/activity_main_frame"/>
<android.support.design.widget.NavigationView
android:id="@+id/navigation_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
android:background="@color/white"
app:headerLayout="@layout/drawer_header"
app:menu="@menu/drawer"/>
</android.support.v4.widget.DrawerLayout>
activity_main_frame.xml
activity_main_frame.xml
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp">
<ImageView
android:id="@+id/backdrop"
android:layout_width="match_parent"
android:layout_height="256dp"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax" />
<include layout="@layout/activity_main_items"/>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:layout_collapseMode="pin"/>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_gravity="bottom"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" >
</FrameLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
app:layout_anchor="@id/appbar"
app:layout_anchorGravity="bottom|right|end"
app:borderWidth="0dp"
android:src="@drawable/app_ic_slide_wallpaper_dark"
android:layout_margin="@dimen/big_padding"
android:clickable="true"/>
</android.support.design.widget.CoordinatorLayout>
我的主页片段最初是设置的，那是我想要展开折叠工具栏的地方，而且效果很好.但是，当我从侧边抽屉更改片段时，我想禁用扩展工具栏.
My home fragment is set initially and that is where i want the collapsing toolbar expanded and that works fine. However when i change fragments from side drawer i want to disable the expanding toolbar.
我已经想出了如何在选择抽屉项目时折叠它，但我还需要确保它不会展开，除非显示主页片段.这可能吗?
I have figured out how to collapse it when a drawer item is selected but i also need to make sure it doesn't expand unless the home fragment is displayed. is this possible?
public void collapseToolbar(){
CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) appbar.getLayoutParams();
behavior = (AppBarLayout.Behavior) params.getBehavior();
if(behavior!=null) {
behavior.onNestedFling(coordinator, appbar, null, 0, 10000, true);
}
}
推荐答案
现在，在支持库的 v23 中，您可以轻松控制应用栏的可见性.
Now, in v23 of support library you can easily control your appbar visibility.
只需获取对您的 AppBarLayout 的引用并根据您要加载的片段隐藏/显示它:
Just get a reference to your AppBarLayout and hide/show it depending on the fragment you want to load:
private AppBarLayout appBarLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
[...]
appBarLayout = (AppBarLayout) findViewById(R.id.appbar);
[...]
}
public void switchToFragment(Fragment fragment, String tag, boolean expandToolbar){
FragmentManager fragmentManager = getSupportFragmentManager();
Fragment currentFragment = fragmentManager.findFragmentByTag(currentFragmentTag);
if(currentFragment == null || !TextUtils.equals(tag, currentFragmentTag) ){
currentFragmentTag = tag;
fragmentManager
.beginTransaction()
.replace(R.id.flContent, fragment, currentFragmentTag)
.commit();
if(expandToolbar){
appBarLayout.setExpanded(true,true);
}else{
appBarLayout.setExpanded(false,true);
}
}
}
附言不要忘记在 build.gradle 中添加所需的依赖项:
P.S. don't forget to add the required dependencies in your build.gradle:
dependencies {
compile 'com.android.support:design:23.2.1'
compile 'com.android.support:appcompat-v7:23.2.1'
compile 'com.android.support:recyclerview-v7:23.2.1'
}
如果您还想在某些片段中锁定您的工具栏(除了折叠)，您必须求助于解决方法，因为直到现在(支持设计的 v23.2.1)，CollapsingToolbarLayout 才提供此功能.在这里您可以找到我提出的解决方法.
If you also want to lock your toolbar in certain fragments (apart from collapsing) you have to resort to workarounds as this feature is not provided by CollapsingToolbarLayout until now (v23.2.1 of support design). Here you can find my proposed workaround.
这篇关于需要为某些片段禁用在 CollapsingToolbarLayout 上展开的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
