Update
I want to accomplish the same behavior that google maps has with Support Library 23.x.+ and without ANY 3rd library
NOTE: this in not a duplicated question because:
I have already the Official bottomSheet working (even inside a tab and view pager).
What is making me going crazy is how to achieve the image behavior that come up from the BottomSheet when sliding up using official bottomSheet?.
I have tried using anchor like FAB with no success.
I read something about using a scroll listener but ppl said its not smooth and faster like google maps.
My XML (I don't think its going to help but anyway):
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.MasterActivity">
<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"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay"
app:layout_scrollFlags="scroll|enterAlways|snap">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="?android:attr/borderlessButtonStyle"
android:text="Departure"
android:layout_gravity="center"
android:id="@+id/buttonToolBar"
/>
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="@android:color/white"
app:tabTextColor="@color/colorAccent"
app:tabSelectedTextColor="@color/colorAccent"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<android.support.v4.widget.NestedScrollView
android:id="@+id/asdf"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:behavior_peekHeight="100dp"
android:fitsSystemWindows="true"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
<LinearLayout
android:id="@+id/qwert"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="16dp"
android:background="@android:color/white"
android:padding="15dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="BOOTOMSHEET TITLE"
android:textAppearance="@style/TextAppearance.AppCompat.Title" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button1"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="text 2"
android:layout_margin="10dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="text 3"
android:layout_margin="10dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="text 4"
android:layout_margin="10dp"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="320dp"
android:background="@color/colorAccent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Your remaining content here"
android:textColor="@android:color/white" />
</FrameLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.FloatingActionButton
android:layout_height="wrap_content"
android:layout_width="wrap_content"
app:layout_anchor="@id/asdf"
app:layout_anchorGravity="top|right|end"
android:src="@drawable/abc_ic_search_api_mtrl_alpha_copy"
android:layout_margin="@dimen/fab_margin"
android:clickable="true"/>
</android.support.design.widget.CoordinatorLayout>
If you want to achieve it using Support Library 23.4.0.+ I will tell you how I got it and how its works.
As far I can see that activity/fragment has the followings behaviors:
note2: This answer talk about 6 things not about 1 or 2 like other question, can you see the difference now?
Ok, now let's check one bye one:
ToolBars
When you open that view in google maps u can see a toolbar in where you can search, it's the only one that I'm not doing equals like google maps, because I wanted to do it more generic. Anyway that ToolBar
is inside an AppBarLayout
and it got hidden when you start dragging the BottomSheet and it appears again when the BottomSheet reach the COLLAPSED
state.
To achieve it you need:
Behavior
and extend it from AppBarLayout.ScrollingViewBehavior
layoutDependsOn
and onDependentViewChanged
methods. Doing it you will listen for bottomSheet movements.This is how I did it for first toolbar or ActionBar:
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
return dependency instanceof NestedScrollView;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child,
View dependency) {
if (mChild == null) {
initValues(child, dependency);
return false;
}
float dVerticalScroll = dependency.getY() - mPreviousY;
mPreviousY = dependency.getY();
//going up
if (dVerticalScroll <= 0 && !hidden) {
dismissAppBar(child);
return true;
}
return false;
}
private void initValues(final View child, View dependency) {
mChild = child;
mInitialY = child.getY();
BottomSheetBehaviorGoogleMapsLike bottomSheetBehavior = BottomSheetBehaviorGoogleMapsLike.from(dependency);
bottomSheetBehavior.addBottomSheetCallback(new BottomSheetBehaviorGoogleMapsLike.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, @BottomSheetBehaviorGoogleMapsLike.State int newState) {
if (newState == BottomSheetBehaviorGoogleMapsLike.STATE_COLLAPSED ||
newState == BottomSheetBehaviorGoogleMapsLike.STATE_HIDDEN)
showAppBar(child);
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
}
});
}
private void dismissAppBar(View child){
hidden = true;
AppBarLayout appBarLayout = (AppBarLayout)child;
mToolbarAnimation = appBarLayout.animate().setDuration(mContext.getResources().getInteger(android.R.integer.config_shortAnimTime));
mToolbarAnimation.y(-(mChild.getHeight()+25)).start();
}
private void showAppBar(View child) {
hidden = false;
AppBarLayout appBarLayout = (AppBarLayout)child;
mToolbarAnimation = appBarLayout.animate().setDuration(mContext.getResources().getInteger(android.R.integer.config_mediumAnimTime));
mToolbarAnimation.y(mInitialY).start();
}
the complete file if you need it
The second Toolbar or "Modal" toolbar:
You have to override same methods but in this one you have to take care about more behaviors:
The code for this one is a little extensive so I will let the link
The FAB
This is a Custom Behavior too but extends from FloatingActionButton.Behavior
. In onDependentViewChanged
you have to look when it reach the "offSet" or point in where you want to hide it. In my case I want hide it when its near to the second toolbar, so I dig into FAB parent (a CoordiantorLayout) looking for the AppBarLayout that contains the ToolBar, then I use the ToolBar position like OffSet
:
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton child, View dependency) {
if (offset == 0)
setOffsetValue(parent);
if (dependency.getY() <=0)
return false;
if (child.getY() <= (offset + child.getHeight()) && child.getVisibility() == View.VISIBLE)
child.hide();
else if (child.getY() > offset && child.getVisibility() != View.VISIBLE)
child.show();
return false;
}
Complete Custom FAB Behavior link
The Image behind the BottomSheet with parallax effect:
Like the others its a custom behavior, the only "complicated" thing in this one is the little algorithm that keeps the Image anchored to the BottomSheet and avoid the image collapse like default parallax effect:
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child,
View dependency) {
if (mYmultiplier == 0) {
initValues(child, dependency);
return true;
}
float dVerticalScroll = dependency.getY() - mPreviousY;
mPreviousY = dependency.getY();
//going up
if (dVerticalScroll <= 0 && child.getY() <= 0) {
child.setY(0);
return true;
}
//going down
if (dVerticalScroll >= 0 && dependency.getY() <= mImageHeight)
return false;
child.setY( (int)(child.getY() + (dVerticalScroll * mYmultiplier) ) );
return true;
}
complete file for backdrop Image with parallax effect
Now for the end: The Custom BottomSheet Behavior
To achieve the 3 steps first you need to understant that default BottomSheetBehavior has 5 states: STATE_DRAGGING, STATE_SETTLING, STATE_EXPANDED, STATE_COLLAPSED, STATE_HIDDEN
and for the Google Maps behavior you need to add a middle state between collapsed and expanded: STATE_ANCHOR_POINT
.
I tried extends the default bottomSheetBehavior with no success, so I just copy paste all code and modified what I need.
To achieve what I'm talking about follow the next steps:
CoordinatorLayout.Behavior<V>
BottomSheetBehavior
file to your new one.Modify the method clampViewPositionVertical
with the following code:
@Override
public int clampViewPositionVertical(View child, int top, int dy) {
return constrain(top, mMinOffset, mHideable ? mParentHeight : mMaxOffset);
}
int constrain(int amount, int low, int high) {
return amount < low ? low : (amount > high ? high : amount);
}
Add a new state
public static final int STATE_ANCHOR_POINT = X;
Modify the next methods: onLayoutChild
, onStopNestedScroll
, BottomSheetBehavior<V> from(V view)
and setState
(optional)
public boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) {
// First let the parent lay it out
if (mState != STATE_DRAGGING && mState != STATE_SETTLING) {
if (ViewCompat.getFitsSystemWindows(parent) &&
!ViewCompat.getFitsSystemWindows(child)) {
ViewCompat.setFitsSystemWindows(child, true);
}
parent.onLayoutChild(child, layoutDirection);
}
// Offset the bottom sheet
mParentHeight = parent.getHeight();
mMinOffset = Math.max(0, mParentHeight - child.getHeight());
mMaxOffset = Math.max(mParentHeight - mPeekHeight, mMinOffset);
//if (mState == STATE_EXPANDED) {
// ViewCompat.offsetTopAndBottom(child, mMinOffset);
//} else if (mHideable && mState == STATE_HIDDEN...
if (mState == STATE_ANCHOR_POINT) {
ViewCompat.offsetTopAndBottom(child, mAnchorPoint);
} else if (mState == STATE_EXPANDED) {
ViewCompat.offsetTopAndBottom(child, mMinOffset);
} else if (mHideable && mState == STATE_HIDDEN) {
ViewCompat.offsetTopAndBottom(child, mParentHeight);
} else if (mState == STATE_COLLAPSED) {
ViewCompat.offsetTopAndBottom(child, mMaxOffset);
}
if (mViewDragHelper == null) {
mViewDragHelper = ViewDragHelper.create(parent, mDragCallback);
}
mViewRef = new WeakReference<>(child);
mNestedScrollingChildRef = new WeakReference<>(findScrollingChild(child));
return true;
}
public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, V child, View target) {
if (child.getTop() == mMinOffset) {
setStateInternal(STATE_EXPANDED);
return;
}
if (target != mNestedScrollingChildRef.get() || !mNestedScrolled) {
return;
}
int top;
int targetState;
if (mLastNestedScrollDy > 0) {
//top = mMinOffset;
//targetState = STATE_EXPANDED;
int currentTop = child.getTop();
if (currentTop > mAnchorPoint) {
top = mAnchorPoint;
targetState = STATE_ANCHOR_POINT;
}
else {
top = mMinOffset;
targetState = STATE_EXPANDED;
}
} else if (mHideable && shouldHide(child, getYVelocity())) {
top = mParentHeight;
targetState = STATE_HIDDEN;
} else if (mLastNestedScrollDy == 0) {
int currentTop = child.getTop();
if (Math.abs(currentTop - mMinOffset) < Math.abs(currentTop - mMaxOffset)) {
top = mMinOffset;
targetState = STATE_EXPANDED;
} else {
top = mMaxOffset;
targetState = STATE_COLLAPSED;
}
} else {
//top = mMaxOffset;
//targetState = STATE_COLLAPSED;
int currentTop = child.getTop();
if (currentTop > mAnchorPoint) {
top = mMaxOffset;
targetState = STATE_COLLAPSED;
}
else {
top = mAnchorPoint;
targetState = STATE_ANCHOR_POINT;
}
}
if (mViewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) {
setStateInternal(STATE_SETTLING);
ViewCompat.postOnAnimation(child, new SettleRunnable(child, targetState));
} else {
setStateInternal(targetState);
}
mNestedScrolled = false;
}
public final void setState(@State int state) {
if (state == mState) {
return;
}
if (mViewRef == null) {
// The view is not laid out yet; modify mState and let onLayoutChild handle it later
/**
* New behavior (added: state == STATE_ANCHOR_POINT ||)
*/
if (state == STATE_COLLAPSED || state == STATE_EXPANDED ||
state == STATE_ANCHOR_POINT ||
(mHideable && state == STATE_HIDDEN)) {
mState = state;
}
return;
}
V child = mViewRef.get();
if (child == null) {
return;
}
int top;
if (state == STATE_COLLAPSED) {
top = mMaxOffset;
} else if (state == STATE_ANCHOR_POINT) {
top = mAnchorPoint;
} else if (state == STATE_EXPANDED) {
top = mMinOffset;
} else if (mHideable && state == STATE_HIDDEN) {
top = mParentHeight;
} else {
throw new IllegalArgumentException("Illegal state argument: " + state);
}
setStateInternal(STATE_SETTLING);
if (mViewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) {
ViewCompat.postOnAnimation(child, new SettleRunnable(child, state));
}
}
public static <V extends View> BottomSheetBehaviorGoogleMapsLike<V> from(V view) {
ViewGroup.LayoutParams params = view.getLayoutParams();
if (!(params instanceof CoordinatorLayout.LayoutParams)) {
throw new IllegalArgumentException("The view is not a child of CoordinatorLayout");
}
CoordinatorLayout.Behavior behavior = ((CoordinatorLayout.LayoutParams) params)
.getBehavior();
if (!(behavior instanceof BottomSheetBehaviorGoogleMapsLike)) {
throw new IllegalArgumentException(
"The view is not associated with BottomSheetBehaviorGoogleMapsLike");
}
return (BottomSheetBehaviorGoogleMapsLike<V>) behavior;
}
link to the hole project in where you can see all Custom Behaviors
note3: next time add a comment asking in a polite way for change of the answer or ask why this answer has SOME equals stuff than others answer of mine about same topic BEFORE close it or mark like duplicated.
And here is how its looks like:
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