需要禁用CollapsingToolbarLayout上某些片段的扩展 [英] Need to disable expand on CollapsingToolbarLayout for certain fragments
问题描述
我有一个AppCompatActivity，用于控制替换许多片段.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>
最初设置了我的家庭片段，那是我希望折叠的工具栏扩展且可以正常工作的地方.但是，当我从侧面抽屉更改片段时，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.
我已经想通了，当选择了抽屉里的项目，但我也需要确保它不会展开，除非被显示在主片段如何将其折叠.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.
仅获取对您的AppBarLayout的引用，并根据要加载的片段隐藏/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);
}
}
}
P.S.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'
}
如果您还想将工具栏锁定在某些片段中(除了折叠之外)，则必须求助于变通方法，因为CollapsingToolbarLayout到目前为止(支持设计v23.2.1)才提供此功能. 在这里，您可以找到我建议的解决方法.
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.
这篇关于需要禁用CollapsingToolbarLayout上某些片段的扩展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！
