Collapsing toolbar android github

Collapsing toolbar android github

collapsing toolbar android material design

garis besar turorial

1. tambahkan support design library pada gradle project

1. buat layout structure seperti berikut:

• Coordinator Layout
  A powerful FrameLayout that specifies behavior for child views for various interactions. It also allows anchoring of floating views in your layout.
• AppBarLayout
  It is a special kind of vertical LinearLayout. It helps respond to its children’s scroll events (scroll gestures). Additionally, it’s responsible for implementing many features of Material Design’s AppBarLayout.
• CollapsingToolbarLayout
  It is a Toolbar wrapper which makes the ‘Flexible Space’ pattern possible. It collapses the image header while decreasing the expanded title to a Toolbar title.

1. Detail XML collapsing toolbar

1. gunakan Scrim agar text pada collapsing toolbar. Scrim adalah semi transparent gradient yang diperlukan sebagai gradasi pada sisi atas dan sisi bawah ImageView agar text pada collapsing toolbar menjadi lebih jelas.

1. tempatkan FAB(FloatingActionButton) di pojok-kanan-bawah pada AppBarLayout:

1. buat hidden action add agar FAB add pada collapsing button, pada saat ditutup(collapsed) tetap bisa diakses, tambahkan menu add pada options menu. Untuk melakukannya kita perlu listener berikut: OffsetChangedListener.

• implementasi OffsetChangedListener:

• update toolbar menu pertama-tama tambahkan menu default ke dalam toolbar dengan mengimplementasikan onCreateOptionsMenu()

kemudian tambahkan menu add pada toolbar ketika collapsing toolbar tertutup.

1. warna dinamis dengan ColorPalette API ketika collapsing toolbar tertutup, maka warna toolbar seharusnya mengikuti warna yang paling dominan dari gambar. Untuk melakukannya kita perlu menggunkan ColorPalette API dari android support library. Tambahkan dulu dependency ke dalam file build.gradle.

kemudian untuk menggunakannya seperti berikut:

ada beberapa pilihan warna variant palette seperti berikut:

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Collapsing toolbar android github

multiline-collapsingtoolbar

multiline-collapsingtoolbar is a replacement for CollapsingToolbarLayout from the Android Design Support Library which can deal with multiline titles (with a customizable maximum number of lines) in the expanded state. When collapsing the toolbar, the lower lines of the title fade away to leave only the top line visible.

Information about compatibility with AndroidX

We are currently not planning to update this library for support of the Android Support Library version 28 or the new AndroidX libraries, as has been discussed in #62 and other places. Instead, we are trying to get our modifications merged into the official Material Components Android library. Please see the PR for more details.

Here you can see the library in action in the included demo app:

If you are using Gradle and the JCenter Maven Repository, installing the library is as simple as adding a new dependency statement.

The current version 27.1.1 of the library is based on the code and tested with the Design Support Library version 27.1.1. We’ll try to keep up to date with new support library versions as soon as possible, but please do not expect this library to run with support versions other than that.

The library’s public API is nearly identical to the version from the support library, so you can use it as a drop-in replacement. We only added a maxLines attribute and corresponding getter and setter functions to the CollapsingToolbarLayout to make it possible to change the maximum number of lines, which is set to 3 by default.

As the Design Support Library, it should be compatible with API 14 (Android 4.0) and above.

XML layout example:

You can find a simple demo application in the demo module.

Most of the code is copied from the original Support Library classes, the only changes (apart from the package name, imports and automatic code reformatting) are in the CollapsingTextHelper and CollapsingToolbarLayout classes. The changes there are marked with comments.

This library is probably not complete and might contain bugs that only occur in constellations we did not yet test. Please do not hesitate to create an issue on GitHub for any problems that cross your way. Please understand that we cannot afford to spend time fixing problems that do not affect our products, but we’ll be happy to merge pull requests if you or someone else is able to improve this library.

If you get stuck anywhere in the process, please do not hestitate to ask us anytime at info@opacapp.de.

Please note that we have a Code of Conduct in place that applies to all project-related communication.

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Collapsing toolbar android github

A simple implementation of CollapsingToolbarLayout for Jetpack Compose

You should add mavenCentral() repository before installation. Then add the following line to the dependencies block in your app level build.gradle:

An example can be found here.

CollapsingToolbarScaffold is a container to help you place composables and move them as a user dispatches scroll. It provides two holes where you can place you components. To use CollapsingToolbarScaffold you will need CollapsingToolbarScaffoldState which could be retrieved using rememberCollapsingToolbarScaffoldState() .

The toolbar will collapse until it gets as small as the smallest child, and will expand as large as the largest child.

Also note that the content should be scrollable for the CollapsingToolbarScaffold to consume nested scroll. For LazyColumn , you don’t have to care of anything because it is scrollable by default. Column, however, is not scrollable by default so you can provide Modifier.verticalScroll() to make a content dispatch nested scroll.

CollapsingToolbarScaffoldState is a holder of the scaffold state, such as the value of y offset and how much the toolbar has expanded. The field is public so you may use it as you need. Note that the CollapsingToolbarScaffoldState is stable, which means that a change on a value of the state triggers a recomposition.

parallax, pin, road

You can tell children of CollapsingToolbar how to deal with a collapse/expansion. This works almost the same way to the collapseMode in the CollapsingToolbarLayout except for the road modifier.

The road() modifier allows you to place a child relatively to the toolbar. It receives two arguments: whenCollapsed and whenExpanded . As the name suggests, these describe how to place a child when the toolbar is collapsed or expanded, respectively. This can be used to display a title text on the toolbar which is moving as the scroll is fed.

The above code orders the title Text to be placed at the CenterStart position when the toolbar is collapsed and BottomEnd position when it is expanded.

ScrollStrategy defines how CollapsingToolbar consumes scroll. You can set your desired behavior by providing scrollStrategy to CollapsingToolbarScaffold :

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Collapsing toolbar android github

Although the new design support library allows us to do some cool stuff, the available sample code does not cover the potential that it has been built for. Most of the samples that I came across, including the cheese square example by Chris Banes, create the application so that minimum code has to be written.

But what if I want a different layout and implementation? My main requirement was that I did NOT require a Toolbar for my design. When going through the AOSP code for CollapsibleTollbarLayout in the design support library, I realized that it has a tight integration with the Toolbar. So, Initially, I decided to work around that. There are a very few blogs out there that actually go deep into the actual potential of the CollapsibleToolbarLayout.

Few of them are listed below:

In a nutshell, it all boils down to a few things:

Coordinator Layout controls the «behavior» of its children which implement CoordinatoLayout.Behavior Check out NestedScrollView «Behavior» or AppBarLayout «Behavior» or FAB «Behavior» for implementations

AppBarLayout calls on a OnOffsetChangedListener implementation when it scrolls,
which can be used to do stuff. Check out OnOffsetChangedListener in CollapsingToolbarLayout

Well, that was my premise of creating the CollapsibleToolbarHelper. It of course is derived heavily from the AOSP code, but with a few modifications. It supports the following collapse modes: — MOVE_ON_SCROLL = The children move when the collapsible toolbar collapses to hit the bottom of that view — PARALLAX_ON_SCROLL = THe usual parallax, move and then hide when the Toolbar collapses — PIN_ON_SCROLL = Stays at the position where it is laid out originally — HIDE_ON_COLLAPSE = Stays at its location and hides when the toolbar is collapsed — SHOW_ON_COLLAPSE = Is hidden at the location that it is supposed to and appears after the Toolbar has collapsed Note that it has to be used as a direct child of AppBarLayout since it depends on the OffsetChangedListener of the AppBarLayout to collapse and expand.

Since I was designing the CollapsibleToolbar, I required a CollapsibleText as well. But the default CollapsibleTextHelper is coupled too tightly with the CollapsingToolbarLayout and not public to be modified. So, taking inspirations from AOSP, Chris banes’ Philm and Nick Butchers Plaid, I wrote my own CollapsingTextlayout.

I know that there is a lot of room for improvement and that there are obvious optimizations and feature enhancements, but the main objective of re-writing these widgets was learning. I have collected all the ideas from the given references and tried to simplify the implementation as much as possible. The code is commented and should be self explanatory.

Interested? Well go ahead, download and use the widgets.

The MIT License (MIT)

Copyright (c) 2016 Melvin Lobo

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the «Software»), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED «AS IS», WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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A combination of custom CollapsibleToolbar and Collapsing Text to give you the same effect as App Bar Layout and Collapsing Toolbar from the Design support library sans the Toolbar

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Collapsing toolbar android github

Standard CollapsingToolbarLayout with subtitle support.

• Just like the title, subtitle text will have to be 1 line.
• When collapsed, a subtitle would still appear as Toolbar’s.
• Separate configuration for title and subtitle: text color, gravity, etc.

Since it uses a lot of CollapsingToolbarLayout resources and API, there are a few:

• Only safe to use with the same version of material components.
• Deceptive package name.

It is detabable if we even need this library. If the material guidelines says it’s ok to have a multiline text in toolbar layout, then they surely would’ve already implemented such feature. If it doesn’t say anything about subtitle (which is odds because Toolbar has it), then we probably shouldn’t use it out of respect to the guidelines.

Snapshots of the development version are available in Sonatype’s snapshots repository.

Treat SubtitleCollapsingToolbarLayout just like a regular CollapsingToolbarLayout .

SubtitleCollapsingToolbarLayout has all the attributes of CollapsingToolbarLayout , and a few extras.

Attribute	Description	Default value/behavior
subtitle	subtitle text	disabled
collapsedSubtitleTextAppearance	text appearance of subtitle when collapsed	TextAppearance.AppCompat.Widget.ActionBar.Subtitle
expandedSubtitleTextAppearance	text appearance of subtitle when expanded	TextAppearance.AppCompat.Headline

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Standard CollapsingToolbarLayout with subtitle support

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