Somehow I came across Reddit app, and wondered how their Scrolling mechanism works. As you can see from the gif, there is a Menubar (Up/Downvote-comment-share bar) that always locates within the screen and can’t be scrolled out of the screen when scrolled up/down. When scrolling up, it will be located underneath the Toolbar (the grey bar at the top). When scrolling down, it will be located above the EditTextView (the Add-a-comment bar at the bottom).
Relative layout
|-->Toolbar (android:id="#+id/toolbar")
|-->ScrollView (android:layout_below="#id/toolbar")
|-->Child (This child is located underneath the Toolbar when scrolling up)
|-->Child
|-->Child
If I wanted to write this page, what dependencies, widgets or concepts
would I need to use or look into?
Note: You can give me snippets of codes if you prefer :)
you can use the CoordinatorLayout layout to realize that function. the layout like that. for details, you can see this blog in the medium.
<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/behavior_demo_coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways|snap"
android:background="?attr/colorPrimary" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/behavior_demo_swipe_refresh"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/behavior_demo_recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</android.support.v4.widget.SwipeRefreshLayout>
</android.support.design.widget.CoordinatorLayout>
The toolbar (containing the menu) is outside of the ScrollView in the XML.
Or it may not even be a ScrollView at all.
It may just be view recycling- but even so the toolbar is outside of that XML layout used for displaying the content.
For hiding the TopBar and bottomBar (comment box) I recommend you use Animation
Simply call animation like
//on scrollUp
topLayout.animate().translationY(-300).alpha(0.0f).setDuration(300);
// this will make the layout go up and fade to invisible
//on scrollDown
topLayout.animate().translationY(0).alpha(1.0f).setDuration(300);
// this will make the layout come down and fade to be visible
Implement this will both Views using addOnScrollListener() or I suggest you to have a look at this answer for implementing scroll Up/Down using CoordinateLayout
Hope this will help!
When I set something visible in my recycler view "visibility = VISIBLE" it goes offscreen if its close to bottom or top, I wanted to know if is there any way to make the recyclerview focus in it when VISIBLE is called.
Another problem I have is with move to "(ctx as MainActivity).moveTo(id.toInt() + 7)" << for those who asked moveTo jumps to target item in the recycler view.
I am having a hard time to make it look good and jump to the right spot, I think the toolbar with "app:layout_scrollFlags="scroll|enterAlways"" might be messing with it.
I tried adding numbers to the move-to and I managed to make the keyboard move things up when opened to keep focus on edit text but couldn't solve the other problems.
The toolbar
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:layout_weight="1"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
app:title="Gerenciador de Prioridades"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways">
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
On top of that I get some null error first time I try to use moveto so I made an if to avoid it and +7 to make sure it goes down, dont know if it's the best approach.
if (id != 1.toLong()) {
(ctx as MainActivity).moveTo(id.toInt() + 7)
}
I really appreciate any help or suggestions you can provide.
Edit :
When this item is too close to the botom and with visibility GONE it goes offscreen when I click it for visibility = VISIBLE , so im wondering if there is anyway to make it go up or something to keep it inside the scroll view but visible for the user.
Use include to place you view in the app bar layout
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:layout_weight="1"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
app:title="Gerenciador de Prioridades"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways">
</androidx.appcompat.widget.Toolbar>
<include layout="#layout/content_main" />
</com.google.android.material.appbar.AppBarLayout>
Then add your views to the content main layout , this should fix the issue
This post says:
When you add a FloatingActionButton as a child of your
CoordinatorLayout and then pass that CoordinatorLayout to your
Snackbar.make() call - instead of the snackbar displaying over the
floating action button, the FloatingActionButton ... automatically
move upward as the snackbar animates in and returns to its position
when the snackbar animates out
I've made exactly as described there but FAB does not move upward. (Snackbar can be swiped out, it means that CoordinatorLayout knows about it.)
Upd
Layout:
<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.v4.widget.DrawerLayout
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.Toolbar
android:id="#+id/action_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:theme="#style/ThemeOverlay.ActionBar"/>
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/action_toolbar"/>
</RelativeLayout>
<ListView
android:id="#+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:layout_marginTop="?attr/actionBarSize"
android:background="#color/theme_primary_darker_color"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp"/>
</android.support.v4.widget.DrawerLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/toolbar_action_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_navigation_white_24dp"
android:layout_margin="16dp"
android:visibility="gone"
app:borderWidth="0dp"
app:elevation="6dp"
app:layout_anchor="#id/action_toolbar"
app:layout_anchorGravity="bottom|right|end"
app:pressedTranslationZ="12dp"/>
</android.support.design.widget.CoordinatorLayout>
Code:
mCoordinatorLayout = (CoordinatorLayout) findViewById(R.id.main_content);
...
Snackbar.make(mCoordinatorLayout, R.string.waypoint_deleted, Snackbar.LENGTH_LONG).show();
I've written sample project based on the code you posted and I had to change three things to make FloatingActionButton aware of the Snackbar.
Set 'minifyEnabled' property of my build to false - looks like Proguard strips out some annotations (e.g. Behaviours) which are necessary to coordinate FloatingActionButton. You'll need to add some Proguard rules in your release build where Proguard is enabled.
Pass the FloatingActionButton as a first argument of Snackbar.make(), not the CoordinatorLayout itself as mentioned here.
Remove app:layout_anchor="#id/action_toolbar" and replace app:layout_anchorGravity="bottom|right|end" with the app:layout_gravity="bottom|right|end" from the layout (not sure if it's suitable for you).
If it doesn't work for you, you can try to write your own Behavior class as described in the article mentioned above.
I had a similar problem where my fab button wouldn't move down. Took me a while but it was because I had animations off in the developers option. Hope you got it working even though I know this post is a bit dated.
I was having the issue where the fab would not return to its original location after the snackbar disappeared. Make sure Animator duration scale is turned on. A good default is 1x.
The setting can be found in:
Settings app --> Developer Options
Dev Settings app (on emulators)
This setting along with other animation settings were turned off on one of my emulators. Turning it back on got the fab working correctly.
Overview
I am trying to implement one of the Scrolling Techniques, Flexible space with overlapping content, described in Material Design.
Flexible space with overlapping content
Content can overlap the app bar.
Behavior:
The app bar’s starting position should be located behind the content.
Upon upward scroll, the app bar should scroll faster than the content,
until the content no longer overlaps it. Once anchored in place, the
app bar lifts up to allow content to scroll underneath.
https://www.google.co.in/design/spec/patterns/scrolling-techniques.html#scrolling-techniques-scrolling
Problem
However, the problem is,
the title in my AppBar scrolls down when expanded and hides below the overlapping content.
Here, my toolbar is hidden below the overlapping CardView.
When the appbar is collapsed, the toolbar and hence the Title slides up from below.
Code
Here's my Code:
activity-main.xml
<android.support.design.widget.CoordinatorLayout
...
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="200dp"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
...
android:layout_width="match_parent"
android:layout_height="match_parent"
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="top"
android:background="?attr/colorPrimary"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
...
I have also added these in my MainActivity's onCreate function
setSupportActionBar(toolbar);
collapsingToolbarLayout.setTitle("App Name");
I want the toolbar(with the tile and the other contents, which I will add later) to stay at the top irrespective of the appbar being expanded or collapsed.
I have read the documentations, gone through many posts and tutorials, watched a lot of videos but failed to find a working solution or any related solutions at all.
If anyone has some idea on how to fix this, please suggest. Thanks for helping.
I was looking for a solution myself when I found the answer in the comments on a similar issue report.
Basically you call setTitleEnabled() on your CollapsingToolbarLayout like this:
CollapsingToolbarLayout.setTitleEnabled(false);
You can do this in xml as well, by adding this to your CollapsingToolbarLayout:
app:titleEnabled="false"
By setting it to false, you'll get the desired behaviour. The title stays fixed to the top of the screen.
The Toolbar itself was actually already at the top, but this makes the title stay there as well, instead of translating between the bottom of the CollapsingToolbarLayout and the Toolbar.
I have acheived this by adding below code inside Toolbar tag.
app:layout_collapseMode="pin"
In my case I needed to add app:titleEnabled="false" to the CollapsingToolbarLayout AND app:layout_collapseMode="pin" to the android.support.v7.widget.Toolbar
Now the toolbar stays pinned to the top of the screen, irrespective of whether the user scrolls up or down.
To keep title at top, simple put this attribute to your CollapsingToolbarLayout:
app:expandedTitleGravity="top"
I'm updating an app to use the new Toolbar instead of the regular ActionBar.
In my app the user must be able to select a contact from their contact list. To do so, I've added a SearchView to the menu.
The contacts are already in the list; the SearchView is used to filter the list using the ArrayAdapter.getFilter() method.
It all worked fine using the ActionBar, but the Toolbar's height gets stretched to just behind the keyboard. Using the XML inspection from Android Device Monitor I can see the ListView exists behind my keyboard.
It almost seems as if the SearchView wants to display suggestions, but I have no such thing configured. Any idea what's going wrong?
The images illustrate the problem. They show the normal, expanded and focused state of the SearchView.
This is my XML menu:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="#+id/action_forwarding_contact_search"
app:showAsAction="always"
android:title="#string/forwarding_contact_search"
app:actionViewClass="android.support.v7.widget.SearchView"
android:icon="#drawable/abc_ic_search_api_mtrl_alpha"/>
</menu>
Edit
Giving the Toolbar a fixed height doesn't solve the problem, because it will make SearchView disappear when it has focus. Changing the gravity of either item seems to have no effect on the SearchView.
I had the same problem than OP, I tried the android:fitsSystemWindows="true" solution, but it was half resolved: the searchview didn't expand anymore but the notification bar (top of screen) became totally white (like the layout background) instead of red (my app theme).
I found an alternative way and it's working like a charm, so for those who are stuck, try this:
In your manifest, just add this line in your activity section:
android:windowSoftInputMode="adjustPan"
Example:
<activity
android:name=".MainActivity"
android:windowSoftInputMode="adjustPan"
android:label="My main activity" >
</activity>
Ok, I figured it out. There was no problem with the SearchView, because the same happened with ordinary EditTexts which were placed normally inside a layout xml. The Toolbar wasn't the problem either.
I created an empty activity and played around with anything I changed in my app and finally came to my theme. On KitKat and later I had <item name="android:windowTranslucentStatus">true</item> set on the theme, so the navigation drawer would appear behind the status bar.
Disabling/removing this would resolve the issue. This reminded me of the android:fitsSystemWindows="true" property. It is set on the Toolbar, but not in the layout xml of the main activity that contains the DrawerLayout.
I guess the DrawerLayout sets itself to fit the system windows.
E.g. there's no fitSystemWindows property here:
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".DashboardActivity">
The activity where the problem occurred did not have a NavigationDrawer, it was a new activity. Setting android:fitsSystemWindows="true" on the root node of the layout of the activity made things work fine.
So, for anyone to read this: if you have <item name="android:windowTranslucentStatus">true</item> in your theme, make sure any root node containing a toolbar contains a android:fitsSystemWindows="true".
Working sample:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<include layout="#layout/toolbar" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button" />
</LinearLayout>
</LinearLayout>
I had same issue like this but did't help above answers but after lots of search found something.
may help you too.!!
after add this attribute in toolbar
android:layout_height="?attr/actionBarSize"
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
style="#style/ToolBarStyle"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/myPrimaryColor"
android:minHeight="#dimen/abc_action_bar_default_height_material" >
<TextView
android:id="#+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textColor="#color/myTextPrimaryColor"
android:layout_gravity="center" />
</android.support.v7.widget.Toolbar>
The accepted answer works fine, however I needed an alternative that would allow to view the Toolbar under translucent status bar.
The problem is that Toolbar uses paddings to cover for system components. As a result, the paddingBottom of the Toolbar is being set to soft keyboard's height whenever the keyboard appears. Solution was to reset the padding before calling super.onMeasure in my custom Toolbar class:
public class MyToolbar extends Toolbar {
(...)
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setPadding(getPaddingLeft(), getPaddingTop(), getPaddingRight(), 0);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
It seems like a old question but I want to address the real cause about this issue.
In fact, the fitsSystemWindows does not only add statusBar insets into your views padding, but also keyboard's height. So, when keyboard showed, your toolbar(which is the view who consumes window insets) will gain a bottom padding equals to your keyboard's height.
Move fitSystemWindows to root node do solve this problem, but sometimes we can't do that, for example we need toolbar's background to fill the statusbar.
So, the real solution for this issue, I think, is to tell view only consume top insets. Luckily, Android do offer a method for us to do that.
private static final View.OnApplyWindowInsetsListener CONSUME_TOP_INSET_LISTENER = new View.OnApplyWindowInsetsListener() {
#RequiresApi(api = Build.VERSION_CODES.KITKAT_WATCH)
#Override
public WindowInsets onApplyWindowInsets(View v, WindowInsets insets) {
int b = v.getPaddingBottom();
int l = v.getPaddingLeft();
int r = v.getPaddingRight();
v.setPadding(l, insets.getSystemWindowInsetTop(), r, b);
int il = insets.getSystemWindowInsetLeft();
int ir = insets.getSystemWindowInsetRight();
int ib = insets.getSystemWindowInsetBottom();
return insets.replaceSystemWindowInsets(il, 0, ir, ib);
}
};
public static void makeViewConsumeTopWindowInsetsOnly(#NonNull View view) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
view.setOnApplyWindowInsetsListener(CONSUME_TOP_INSET_LISTENER);
}
}
Add above code to some place, and call this method with the view you want to consumes top insets.
I ran into a similar issue and setting showAsAction="always|collapseActionView" inside the Search Menu Item (menu.xml) solved the stretching of the toolbar for me.
I had the same issue with a SearchView on a Toolbar with a TextView and Spinner in it. Closing the SearchView (either by pressing the Toolbar back button or by switching to a different tab in the ViewPager) caused the Toolbar to stretch out to just below the top of the keyboard.
I solved it by placing an extra layout around the views in my Toolbar.
Before:
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</android.support.v7.widget.Toolbar>
After
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.v7.widget.Toolbar>
simplest solution without changing xml and keeping translucent system bar is to add:
kotlin:
toolbar.setOnApplyWindowInsetsListener { toolbar, windowInsets ->
toolbar.updatePadding(
windowInsets.systemWindowInsetLeft,
windowInsets.systemWindowInsetTop,
windowInsets.systemWindowInsetRight,
0
)
windowInsets.consumeSystemWindowInsets()
}
please check if your fitsSystemWindows=true are placed correctly.
I would like to share my experience but before that I want to dropped this comment. So far, I really find this CoordinatorLayout shenanigans buggy and not worthy of being dropped in the SDK. Its just buggy. When it behaves like this erratically, the architecture on the xml layout is not much of a help to figure out whats going on. I followed the examples religiously and none of them worked.
Having said that, I am using the build tools version v24.0.2 (The latest as of this writing) and my situation may be of different than the rest. So I am putting this answer along with other answers here.
In my case, I am using this library for NavigationDrawer
As some answers here pointed out, its the navigation drawer. I tried not using that library and still having the problem. I have CoordinatorLayout as the parent layout of my two activities and programatically inserts the NavigationDrawer as instructed by the library author. The expanding Toolbar the size of the screen when focusing on an EditText is still there. Therefore, in my case, the problem is not coming from there.
Here's what I did in my case:
I removedfitsSystemWindows from the CoordinatorLayout layout of the activity. Contrary to what other people suggested here.
I am pasting my entire activity layout here:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.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:id="#+id/coordinatorlayout_homescreen"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activity.HomeScreenActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsingtoolbarlayout_homescreen"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="64dp"
app:expandedTitleMarginEnd="48dp"
app:layout_scrollFlags="scroll|enterAlwaysCollapsed">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_homescreen"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:layout_collapseMode="pin"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<FrameLayout
android:id="#+id/framelayout_homescreen"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.NestedScrollView>
<!--
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab_homescreen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_dialog_email" />
-->
</android.support.design.widget.CoordinatorLayout>
I did this on another activity and it works as expected. I don't have the expanding Toolbar anymore. But this problem occurred. I am about to pull my hair out. The status bar became white. Phoenix Wang solution on that post fix it for me and I quote his answer:
I found the answer in this link:Status Bar Color not changing with
Relative Layout as root element
So it turns out we need remove the
<item name="android:statusBarColor">#android:color/transparent</item> in
styles.xml(v21). And it works just fine for me.
My only concern is how will this solution holds in the upcoming updates. CoordinatorLayout should not be behaving like that.
In case you are using an EditText inside Toolbar, adding "flagNoExtractUi" in imeOptions , will solve the stretching edit area.
EditText for Search Action without stretching:
android:id="#+id/toolbar_editText"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:inputType="text"
android:imeOptions="actionSearch|flagNoExtractUi"
android:singleLine="true" />