ViewHolderArrayAdapter

A replacement of ArrayAdapter which makes use of ViewHolders from the RecyclerView API.

Dependency

allprojects {
    repositories {
        maven { url "https://jitpack.io" }
    }
}

and within your module's build.gradle

dependencies {
    implementation 'com.github.Commit451:ViewHolderArrayAdapter:insert.latest.version'
}

Usage

See the sample project for full usage. Typically, you will create a ViewHolderArrayAdapter:

val spinner = findViewById<Spinner>(R.id.spinner)
val adapter = ViewHolderArrayAdapter(
    context = this,
    objects = cheeses,
    onCreateViewHolder = { parent ->
        // create the overall view holder
        CheeseViewHolder.inflate(parent)
    },
    onCreateDropDownViewHolder = { parent ->
        // create the dropdown view holder
        CheeseDropDownViewHolder.inflate(parent)
    },
    onBindViewHolder = { viewHolder, position, item ->
        // bind the overall view holder
        viewHolder.bind(item)
    },
    onBindDropDownViewHolder = { viewHolder, position, item ->
        // bind the dropdown view holder
        viewHolder.bind(item)
    }
)
spinner.adapter = adapter

If you want to use the same ViewHolder for both the dropdown and the selected item, you can use SingleViewHolderArrayAdapter. And if you have a simple view where only the text changes, you can use TextViewHolderArrayAdapter, or SingleTextViewHolderArrayAdapter

ViewHolderArrayAdapter is not just limited to Spinners, though that is what it was originally designed for. All in all, you could use it with:

• Spinner
• AutoCompleteTextView
• ListView (please don't use ListView)

Why ViewHolder?

Many times, you might have ViewHolders defined that can be shared between Spinners and RecyclerViews. This simple library bridges the gap. Also using ViewHolder is more efficient, as it forces recycling for spinners which can otherwise be overlooked.

License

Copyright 2020 Commit 451

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.