InstantAutoComplete.kt

import android.content.Context
import android.util.AttributeSet
import android.view.MotionEvent
import androidx.appcompat.widget.AppCompatAutoCompleteTextView

/**
 * Created by Chayan Mistry on 21/04/2023
 * Always Visible AutoComplete Dropdown
 */
class InstantAutoComplete @JvmOverloads
/**
 * Constructor
 * @param context Context
 * @param attrs Attribute Set for view
 */
constructor(context: Context, attrs: AttributeSet? = null) : AppCompatAutoCompleteTextView(context, attrs) {

    /**
     * Get android default attributes
     * https://stackoverflow.com/a/70577844/5280371
     */
    private val sInputType = attrs?.getAttributeIntValue(
        "http://schemas.android.com/apk/res/android",
        "inputType", -1
    ) ?: 0

    init {
        inputType = sInputType
    }

    override fun enoughToFilter(): Boolean {
        return true
    }

    override fun onTouchEvent(event: MotionEvent): Boolean {
        if (event.action == MotionEvent.ACTION_DOWN) {
            performClick()
        }
        return super.onTouchEvent(event)
    }

    override fun performClick(): Boolean {
        if (!isPopupShowing) {
            performFiltering(null, 0)
            showDropDown()
        }
        return super.performClick()
    }
}