I'm trying to move from one TextView to the Toolbar when it collapse when scrolling.
Let's say I have a Toolbar and just below of it I have a View, when I scroll up and it starts to not be visible at all I want to update the toolbar with this text, here's an example.
First Scenario
Second Scenario
I've been reading with the CollapsingToolbar but I can figure it out when the view is not that visible and if I have to create like a custom Toolbar with a text at the right where I can set, because it's not the title, it's an extra value of the title.
CodePudding user response：
where I can set, because it's not the title, it's an extra value of the title.
You can use the title for a customized Toolbar as supportActionBar; but adjust the scrolling flags appropriately to the toolbar & the layout behaviour to the main layout.
if I have to create like a custom Toolbar with a text at the right
To set the title to the right; there are 2 properties, one for the collapsed text, and the other for the expanded, you need to align them to the end/right:
app:collapsedTitleGravity="end"
app:expandedTitleGravity="end"
Here is a demo:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="@ id/appbarlayout"
android:layout_width="match_parent"
android:layout_height="100dp"
android:paddingEnd="8dp"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="@ id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:collapsedTitleGravity="end"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleGravity="end"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:title="Hi">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_collapseMode="parallax" />
<androidx.appcompat.widget.Toolbar
android:id="@ id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:title="Hi"
app:titleTextColor="#fff" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<!-- Main Layout -->
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="@ id/appbarlayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/long_text" />
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Make sure to use a NoActionBar theme, and set the custom Toolbar as the supportActionBar:
val toolbar = findViewById<Toolbar>(R.id.toolbar)
setSupportActionBar(toolbar)
Update:
perhaps I missexplained the issue, the thing is, I have a Toolbar and just below, I have like a LinearLayout with Text, and when I scroll and this LinearLayout is going to hide I want to show the text it was in the LinearLayout. So the idea is, Something like you did, but instead of having this "Hi" in the Toolbar, have it in a view just below the Toolbar and when I scroll and it starts to get invisible / non readable just put this "Hi" text in the Toolbar.
You can do this with a customized TextView & the title of the CollapsingToolBar.. and programmatically toggle the visibility on both with the OnOffsetChangedListener
First, create the below styles fol collapsed & expanded states:
<style name="Title.Collapsed" parent="android:TextAppearance">
<item name="android:textColor">@android:color/white</item>
<item name="android:textSize">18sp</item>
</style>
<style name="Title.Expanded" parent="android:TextAppearance">
<item name="android:textColor">@android:color/white</item>
<item name="android:textSize">28sp</item>
</style>
These styles will be applied to app:collapsedTitleTextAppearance & app:expandedTitleTextAppearance on the CollapsingToolbarLayout respectively.
layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="@ id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:fitsSystemWindows="true"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="@ id/collapsingToolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:collapsedTitleGravity="end"
app:collapsedTitleTextAppearance="@style/Title.Collapsed"
app:expandedTitleGravity="end"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:expandedTitleTextAppearance="@style/Title.Expanded"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="40dp"
android:background="@android:color/transparent"
android:gravity="end"
android:orientation="vertical"
android:padding="10dp"
app:layout_collapseMode="parallax">
<TextView
android:id="@ id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hi"
android:textSize="28sp" />
</LinearLayout>
<androidx.appcompat.widget.Toolbar
android:id="@ id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/design_default_color_primary"
app:layout_collapseMode="pin"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="@ id/appBarlayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/long_text" />
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
The detect the appBarLayout scrolling change in addOnOffsetChangedListener:
val collapsingToolbar = findViewById<CollapsingToolbarLayout>(R.id.collapsingToolbar)
collapsingToolbar.title = ""
title = ""
val appBarLayout = findViewById<AppBarLayout>(R.id.appBarLayout)
appBarLayout.addOnOffsetChangedListener(object : OnOffsetChangedListener {
var isShow = false
var scrollRange = -1
override fun onOffsetChanged(appBarLayout: AppBarLayout, verticalOffset: Int) {
if (scrollRange == -1) {
scrollRange = appBarLayout.totalScrollRange
}
if (scrollRange verticalOffset == 0) {
//when collapsingToolbar at that time display actionbar title
collapsingToolbar.title = "Hi"
isShow = true
} else if (isShow) {
collapsingToolbar.title = ""
isShow = false
}
}
})
