View extending EditText loses Styles and is not focusable

Question

I try to subclass EditText for convenience reasons (NumberEdit) using kotlin but the rendered View loses most of the EditText properties. The look is that of a TextView and it is not focusable with the mouse (in the emulator). When I click into the activity I can then edit the first of the NumberEdit widgets and can cycle to the next one with the tab key.

I added two emulator screenshots to illustrate the difference.

An EditText looks like this

The new NumberEdit looks like this

The extended class looks like this:

import android.content.Context
import android.text.InputType
import android.util.AttributeSet
import android.widget.EditText


class EditNumber(context: Context, attributeSet: AttributeSet?, defStyleAttr: Int, defStyleRes: Int)
    : EditText(context, attributeSet, defStyleAttr, defStyleRes) {

    constructor(context: Context) : this(context, null, 0, 0)
    constructor(context: Context, attributeSet: AttributeSet?) : this(context, attributeSet, 0, 0)
    constructor(context: Context, attributeSet: AttributeSet?, defStyleAttr: Int)
        : this(context, attributeSet, defStyleAttr, 0)

    init {
        inputType = InputType.TYPE_CLASS_NUMBER + InputType.TYPE_NUMBER_FLAG_DECIMAL
    }
}

Does anyone have a clue what I am doing wrong? Do I have to reference some attributes explicitly?

Answer 1

I'm not a kotlin expert but if you look at the java source code for edittext you have following:

public class EditText extends TextView {
    public EditText(Context context) {
        this(context, null);
    }
    public EditText(Context context, AttributeSet attrs) {
        this(context, attrs, com.android.internal.R.attr.editTextStyle);
    }
    public EditText(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }
    public EditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

It doesn't look like you pass the right parameters to the constructor... You pass a lot of 0s and nulls...