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https://github.com/everythingme/overscroll-decor
Android: iOS-like over-scrolling effect applicable over almost all scrollable Android views.
https://github.com/everythingme/overscroll-decor
android fling gridview ios listview overscroll recyclerview scrollview viewpager
Last synced: 30 days ago
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Android: iOS-like over-scrolling effect applicable over almost all scrollable Android views.
- Host: GitHub
- URL: https://github.com/everythingme/overscroll-decor
- Owner: EverythingMe
- License: bsd-2-clause
- Created: 2015-11-22T11:44:06.000Z (almost 9 years ago)
- Default Branch: master
- Last Pushed: 2021-04-22T14:49:22.000Z (over 3 years ago)
- Last Synced: 2024-04-30T02:03:19.574Z (7 months ago)
- Topics: android, fling, gridview, ios, listview, overscroll, recyclerview, scrollview, viewpager
- Language: Java
- Size: 3.22 MB
- Stars: 2,833
- Watchers: 76
- Forks: 393
- Open Issues: 44
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
> **Announcement**
>
> An update regarding Bintray's shutdown: The library has been successfuly republished onto maven central, but with a different Group ID; Please update your Gradle dependencies as follows:
>
> ```diff
> -implementation 'me.everything:overscroll-decor-android:1.1.0'
> +implementation 'io.github.everythingme:overscroll-decor-android:1.1.1'
> ```
# Over-Scroll Support For Android's RecyclerView, ListView, GridView, ScrollView ...
The library provides an iOS-like over-scrolling effect applicable over almost all Android native scrollable views. It is also built to allow for very easy adaptation to support custom views.
The core effect classes are loose-[decorators](https://en.wikipedia.org/wiki/Decorator_pattern) of Android views, and are thus decoupled from the actual view classes' implementations. That allows developers to apply the effect over views while keeping them as untampered 'black-boxes'. Namely, it allows for keeping important optimizations such as view-recycling intact.
# Gradle Dependency
Add the following to your module's `build.gradle` file:
```groovy
dependencies {
// ...
implementation 'io.github.everythingme:overscroll-decor-android:1.1.1'
}
```
# Usage
### RecyclerView
Supports both linear and staggered-grid layout managers (i.e. all native Android layouts).
Can be easily adapted to support custom layout managers.
```java
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
// Horizontal
OverScrollDecoratorHelper.setUpOverScroll(recyclerView, OverScrollDecoratorHelper.ORIENTATION_HORIZONTAL);
// Vertical
OverScrollDecoratorHelper.setUpOverScroll(recyclerView, OverScrollDecoratorHelper.ORIENTATION_VERTICAL);
```
### RecyclerView with items swiping / dragging
See _Advanced Usage_.
### ListView
```java
ListView listView = (ListView) findViewById(R.id.list_view);
OverScrollDecoratorHelper.setUpOverScroll(listView);
```
### GridView
```java
GridView gridView = (GridView) findViewById(R.id.grid_view);
OverScrollDecoratorHelper.setUpOverScroll(gridView);
```
### ViewPager
```java
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
OverScrollDecoratorHelper.setUpOverScroll(viewPager);
```
### ScrollView, HorizontalScrollView
```java
ScrollView scrollView = (ScrollView) findViewById(R.id.scroll_view);
OverScrollDecoratorHelper.setUpOverScroll(scrollView);
HorizontalScrollView horizontalScrollView = (HorizontalScrollView) findViewById(R.id.horizontal_scroll_view);
OverScrollDecoratorHelper.setUpOverScroll(horizontalScrollView);
```
### Any View - Text, Image... (Always Over-Scroll Ready)
```java
View view = findViewById(R.id.demo_view);
// Horizontal
OverScrollDecoratorHelper.setUpStaticOverScroll(view, OverScrollDecoratorHelper.ORIENTATION_HORIZONTAL);
// Vertical
OverScrollDecoratorHelper.setUpStaticOverScroll(view, OverScrollDecoratorHelper.ORIENTATION_VERTICAL);
```
# Advanced Usage
```java
// Horizontal RecyclerView
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
new HorizontalOverScrollBounceEffectDecorator(new RecyclerViewOverScrollDecorAdapter(recyclerView));
// ListView (vertical)
ListView listView = (ListView) findViewById(R.id.list_view);
new VerticalOverScrollBounceEffectDecorator(new AbsListViewOverScrollDecorAdapter(listView));
// GridView (vertical)
GridView gridView = (GridView) findViewById(R.id.grid_view);
new VerticalOverScrollBounceEffectDecorator(new AbsListViewOverScrollDecorAdapter(gridView));
// ViewPager
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
new HorizontalOverScrollBounceEffectDecorator(new ViewPagerOverScrollDecorAdapter(viewPager));
// A simple TextView - horizontal
View textView = findViewById(R.id.title);
new HorizontalOverScrollBounceEffectDecorator(new StaticOverScrollDecorAdapter(view));
```
### RecyclerView with [ItemTouchHelper](http://developer.android.com/reference/android/support/v7/widget/helper/ItemTouchHelper.html) based swiping / dragging
As of version 1.0.1, the effect can work smoothly with the RecyclerView's built-in mechanism for items swiping and dragging (based on [ItemTouchHelper](http://developer.android.com/reference/android/support/v7/widget/helper/ItemTouchHelper.html)). BUT, it requires some (very little) explicit configuration work:
```java
// Normally you would attach an ItemTouchHelper & a callback to a RecyclerView, this way:
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
ItemTouchHelper.Callback myCallback = new ItemTouchHelper.Callback() {
...
};
ItemTouchHelper myHelper = new ItemTouchHelper(myCallback);
myHelper.attachToRecyclerView(recyclerView);
// INSTEAD of attaching the helper yourself, simply use the dedicated adapter c'tor, e.g.:
new VerticalOverScrollBounceEffectDecorator(new RecyclerViewOverScrollDecorAdapter(recyclerView, myCallback));
```
For more info on the swiping / dragging mechanism, try [this useful tutorial](https://medium.com/@ipaulpro/drag-and-swipe-with-recyclerview-b9456d2b1aaf).
### Over-Scroll Listeners
As of version 1.0.2, the effect provides a means for registering listeners of over-scroll related events. There are two types of listeners, as follows.
#### State-Change Listener
The over-scroll manager dispatches events onto a state-change listener denoting transitions in the effect's state:
```java
// Note: over-scroll is set-up using the helper method.
IOverScrollDecor decor = OverScrollDecoratorHelper.setUpOverScroll(recyclerView, OverScrollDecoratorHelper.ORIENTATION_HORIZONTAL);
decor.setOverScrollStateListener(new IOverScrollStateListener() {
@Override
public void onOverScrollStateChange(IOverScrollDecor decor, int oldState, int newState) {
switch (newState) {
case STATE_IDLE:
// No over-scroll is in effect.
break;
case STATE_DRAG_START_SIDE:
// Dragging started at the left-end.
break;
case STATE_DRAG_END_SIDE:
// Dragging started at the right-end.
break;
case STATE_BOUNCE_BACK:
if (oldState == STATE_DRAG_START_SIDE) {
// Dragging stopped -- view is starting to bounce back from the *left-end* onto natural position.
} else { // i.e. (oldState == STATE_DRAG_END_SIDE)
// View is starting to bounce back from the *right-end*.
}
break;
}
}
}
```
#### Real-time Updates Listener
The over-scroll manager can also dispatch *real-time*, as-it-happens over-scroll events denoting the current offset resulting due to an over-scroll being in-effect (the offset thus denotes the current 'intensity').
```java
// Note: over-scroll is set-up by explicity instantiating a decorator rather than using the helper; The two methods can be used interchangeably for registering listeners.
VerticalOverScrollBounceEffectDecorator decor = new VerticalOverScrollBounceEffectDecorator(new RecyclerViewOverScrollDecorAdapter(recyclerView, itemTouchHelperCallback));
decor.setOverScrollUpdateListener(new IOverScrollUpdateListener() {
@Override
public void onOverScrollUpdate(IOverScrollDecor decor, int state, float offset) {
final View view = decor.getView();
if (offset > 0) {
// 'view' is currently being over-scrolled from the top.
} else if (offset < 0) {
// 'view' is currently being over-scrolled from the bottom.
} else {
// No over-scroll is in-effect.
// This is synonymous with having (state == STATE_IDLE).
}
}
});
```
The two type of listeners can be used either separately or in conjunction, depending on your needs. Refer to the demo project's RecyclerView-demo section for actual concrete usage.
### Custom Views
```java
public class CustomView extends View {
// ...
}
final CustomView view = (CustomView) findViewById(R.id.custom_view);
new VerticalOverScrollBounceEffectDecorator(new IOverScrollDecoratorAdapter() {
@Override
public View getView() {
return view;
}
@Override
public boolean isInAbsoluteStart() {
// canScrollUp() is an example of a method you must implement
return !view.canScrollUp();
}
@Override
public boolean isInAbsoluteEnd() {
// canScrollDown() is an example of a method you must implement
return !view.canScrollDown();
}
});
```
### Effect Behavior Configuration
```java
/// Make over-scroll applied over a list-view feel more 'stiff'
new VerticalOverScrollBounceEffectDecorator(new AbsListViewOverScrollDecorAdapter(view),
5f, // Default is 3
VerticalOverScrollBounceEffectDecorator.DEFAULT_TOUCH_DRAG_MOVE_RATIO_BCK,
VerticalOverScrollBounceEffectDecorator.DEFAULT_DECELERATE_FACTOR);
// Make over-scroll applied over a list-view bounce-back more softly
new VerticalOverScrollBounceEffectDecorator(new AbsListViewOverScrollDecorAdapter(view),
VerticalOverScrollBounceEffectDecorator.DEFAULT_TOUCH_DRAG_MOVE_RATIO_FWD,
VerticalOverScrollBounceEffectDecorator.DEFAULT_TOUCH_DRAG_MOVE_RATIO_BCK,
-1f // Default is -2
);
```
### Dynamic Effect Disabling
As of version 1.0.4, the effect can be dynamically disabled (detached) and reenabled (attached) at runtime:
```java
IOverScrollDecor decor = OverScrollDecoratorHelper.setUpOverScroll(view);
// Detach. You are strongly encouraged to only call this when overscroll isn't
// in-effect: Either add getCurrentState()==STATE_IDLE as a precondition,
// or use a state-change listener.
decor.detach();
// Attach.
decor.attach();
```
`attach()` and `detach()` can be used repeatedly - as necessary, as can be seen in the demo project (refer to action-bar menu in recycler-view demo).
## Credits
App icons by P.J. Onori,
Timothy Miller,
Icons4Android,
Icons8.com