RecyclerViewInjectorAdapter

RecyclerViewInjectorAdapter wraps your regular RecyclerView.Adapter and adds possibility to inject custom views on desired position without hassle.

Overview

Tested in production - over 1.000.000 installs in the HolidayCheck App
Works with stable IDs & non-stable ID adapters
In most cases, requires no changes to your adapter (see Caution)
Supports multiple view injections
Supports all items animations
Supports Android 15+

Demo

Add it to your Project

Include the library in your build.gradle

dependencies {
    compile 'com.holidaycheck:recyclerviewinjectoradapter:1.0.3'
}

or to your pom.xml if you are using Maven

<dependency>
    <groupId>com.holidaycheck</groupId>
    <artifactId>recyclerviewinjectoradapter</artifactId>
    <version>1.0.3</version>
    <type>aar</type>
</dependency>

Configuration

To enable injecting views you need to wrap your regular adapter with RecyclerViewInjectorAdapter and set it to RecyclerView.

Assuming that your code looks similar to this

MyAdapter adapter = new MyAdapter();

RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setAdapter(adapter)

You should change it to

MyAdapter adapter = new MyAdapter();
RecyclerViewInjectorAdapter injectorAdapter = new RecyclerViewInjectorAdapter(adapter)

RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setAdapter(injectorAdapter)

Usage

After the configuration, you can inject views

injectorAdapter.inject(new InjectedViewCreator() {
    @Override
    public View createView() {
        Button button = new Button(getApplicationContext());
        button.setText("This is injected Button on position 5");
        return button;
    }
}, 5);

Remove injected view by passing position

injectorAdapter.removeInjectedView(5);

There are some methods to control the visibility of injected views

Method	Description
`setShowInjectedViews(boolean showInjectedViews)`	Allows to hide or show all injected views
`setDisplayInjectedViewsOnEmptyChildAdapter(boolean display)`	Decides if injected views should be displayed on empty child adapter
`setDisplayInjectedViewsOnLowerPosition(boolean display)`	Decides if injected views should be displayed on lower position than desired. For example, a view is injected on position 10, but child adapter has only 5 items.

For more details take a look at the javadoc.

Caution

Every update that refers to the regular item should be dispatched to your child adapter.
getAdapterPosition() method of your RecyclerView.ViewHolder now returns position that include also injected views below that position. To get the position without injected views included, please use int realChildAdapterPosition = injectorAdapter.toChildAdapterPosition(getAdapterPosition()) or get rid of getAdapterPosition() by passing reference to your data to ViewHolder and then getting position from your underlying data structure.

Do you want to Contribute?

Feel free to add any cool and useful feature to the library, we're happy to accept Pull Requests.

License

The MIT License (MIT)

Copyright (c) 2016 HolidayCheck AG

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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