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Add FAB layout behavior: hide/show animation durning scrolling event #19

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Add FAB layout behavior: hide/show animation durning scrolling event #19

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4dde19a
Add FAB scroll hide/show behavior
suzp1984 Aug 14, 2015
7a77eaf
make FAB hide and show animation in G+'s way
suzp1984 Aug 14, 2015
c752ccc
remove unnecessary root view
suzp1984 Aug 17, 2015
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4 changes: 1 addition & 3 deletions app/build.gradle
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Original file line number Diff line number Diff line change
Expand Up @@ -16,15 +16,13 @@ android {

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])

compile "com.android.support:appcompat-v7:22.+"
compile 'com.android.support:appcompat-v7:22.+'
compile 'com.android.support:support-v13:22.+'
compile 'com.android.support:support-v4:22.+'
compile 'com.android.support:palette-v7:22.+'
compile 'com.android.support:recyclerview-v7:22.+'
compile 'com.android.support:cardview-v7:22.+'
compile 'com.android.support:design:22.2.1'

compile 'com.jakewharton:butterknife:6.1.0'
compile 'com.jakewharton.timber:timber:2.5.1'
compile 'com.facebook.rebound:rebound:0.3.6'
Expand Down
123 changes: 123 additions & 0 deletions app/src/main/java/io/github/froger/instamaterial/ui/behavior/ScrollAwareFABBehavior.java
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@@ -0,0 +1,123 @@
package io.github.froger.instamaterial.ui.behavior;

import android.content.Context;
import android.os.Build;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.ViewPropertyAnimatorListener;
import android.support.v4.view.animation.FastOutSlowInInterpolator;

import android.support.v4.view.animation.LinearOutSlowInInterpolator;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.AnticipateInterpolator;
import android.view.animation.Interpolator;

import io.github.froger.instamaterial.R;

/**
* Created by moses on 8/6/15.
*/
public class ScrollAwareFABBehavior extends FloatingActionButton.Behavior {
private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
private boolean mIsAnimatingOut = false;

public ScrollAwareFABBehavior(Context context, AttributeSet attrs) {
super();
}

@Override
public boolean onStartNestedScroll(final CoordinatorLayout coordinatorLayout,
final FloatingActionButton child,
final View directTargetChild,
final View target, final int nestedScrollAxes) {
// Ensure we react to vertical scrolling
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL
|| super.onStartNestedScroll(coordinatorLayout,
child, directTargetChild, target, nestedScrollAxes);
}

@Override
public void onNestedScroll(final CoordinatorLayout coordinatorLayout, final FloatingActionButton child,
final View target, final int dxConsumed, final int dyConsumed,
final int dxUnconsumed, final int dyUnconsumed) {

super.onNestedScroll(coordinatorLayout, child, target,
dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);

if (dyConsumed > 0 && !this.mIsAnimatingOut && child.getVisibility() == View.VISIBLE) {
// User scrolled down and the FAB is currently visible -> hide the FAB
animateOut(child);
} else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
// User scrolled up and the FAB is currently not visible -> show the FAB
animateIn(child);
}
}

// Same animation that FloatingActionButton.Behavior uses to hide the FAB when the AppBarLayout exits
private void animateOut(final FloatingActionButton button) {
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) button.getLayoutParams();
int fabBottom = lp.bottomMargin;

if (Build.VERSION.SDK_INT >= 14) {
ViewCompat.animate(button).setDuration(300L)
.translationY(button.getHeight() + fabBottom)
.setInterpolator(INTERPOLATOR)
.setListener(new ViewPropertyAnimatorListener() {
public void onAnimationStart(View view) {
ScrollAwareFABBehavior.this.mIsAnimatingOut = true;
}

public void onAnimationCancel(View view) {
ScrollAwareFABBehavior.this.mIsAnimatingOut = false;
}

public void onAnimationEnd(View view) {
ScrollAwareFABBehavior.this.mIsAnimatingOut = false;
view.setVisibility(View.GONE);
}
}).start();
} else {
Animation anim = AnimationUtils.loadAnimation(button.getContext(), R.anim.fab_out);
anim.setInterpolator(INTERPOLATOR);
anim.setDuration(300L);
anim.setAnimationListener(new Animation.AnimationListener() {
public void onAnimationStart(Animation animation) {
ScrollAwareFABBehavior.this.mIsAnimatingOut = true;
}

public void onAnimationEnd(Animation animation) {
ScrollAwareFABBehavior.this.mIsAnimatingOut = false;
button.setVisibility(View.GONE);
}

@Override
public void onAnimationRepeat(final Animation animation) {
}
});
button.startAnimation(anim);
}
}

// Same animation that FloatingActionButton.Behavior uses to show the FAB when the AppBarLayout enters
private void animateIn(FloatingActionButton button) {

button.setVisibility(View.VISIBLE);
if (Build.VERSION.SDK_INT >= 14) {
ViewCompat.animate(button).setDuration(300L).translationY(0.0F)
.scaleX(1.0F).scaleY(1.0F).alpha(1.0F)
.setInterpolator(INTERPOLATOR).withLayer().setListener(null)
.start();
} else {
Animation anim = AnimationUtils.loadAnimation(button.getContext(), R.anim.fab_in);
anim.setDuration(300L);
anim.setInterpolator(INTERPOLATOR);
button.startAnimation(anim);
}
}
}
16 changes: 6 additions & 10 deletions app/src/main/res/layout/activity_drawer.xml
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@@ -1,21 +1,18 @@
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical">

<android.support.v4.widget.DrawerLayout
<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/drawerLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">

<FrameLayout
<FrameLayout
android:id="@+id/flContentRoot"
android:layout_width="match_parent"
android:layout_height="match_parent" />

<android.support.design.widget.NavigationView
<android.support.design.widget.NavigationView
android:id="@+id/vNavigation"
android:layout_width="wrap_content"
android:layout_height="match_parent"
Expand All @@ -26,5 +23,4 @@
app:itemTextColor="#666666"
app:menu="@menu/drawer_menu" />

</android.support.v4.widget.DrawerLayout>
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
33 changes: 15 additions & 18 deletions app/src/main/res/layout/activity_main.xml
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Original file line number Diff line number Diff line change
@@ -1,35 +1,32 @@
<RelativeLayout 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/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<android.support.design.widget.CoordinatorLayout
<?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/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
android:orientation="vertical"
tools:context=".MainActivity">

<android.support.v7.widget.RecyclerView
<android.support.v7.widget.RecyclerView
android:id="@+id/rvFeed"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<android.support.design.widget.AppBarLayout
<android.support.design.widget.AppBarLayout
android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<include
<include
android:id="@+id/toolbar"
layout="@layout/view_feed_toolbar" />
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.AppBarLayout>

<android.support.design.widget.FloatingActionButton
<android.support.design.widget.FloatingActionButton
android:id="@+id/btnCreate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
Expand All @@ -39,8 +36,8 @@
android:src="@drawable/ic_instagram_white"
app:borderWidth="0dp"
app:elevation="6dp"
app:pressedTranslationZ="12dp" />
app:pressedTranslationZ="12dp"
app:layout_behavior="io.github.froger.instamaterial.ui.behavior.ScrollAwareFABBehavior"/>

</android.support.design.widget.CoordinatorLayout>
</android.support.design.widget.CoordinatorLayout>

</RelativeLayout>