Extending widgets

While extending the Spinner and EditText, I instinctively create the following pattern of object construction.

public MyEditText(Context context) {
    this(context, null);
}

public MyEditText(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

public MyEditText(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs);

    //My custom initialization code
}

Here, the constructor are calling each other by adding the missing argument by a default one. However, this didn't work as I was first expecting it. When running the program, the widget was simply not displayed.

Looking closer at the widget constructor, EditText for instance, I realized that the widget is actually defining the default style.

public EditText(Context context, AttributeSet attrs) {
    this(context, attrs, com.android.internal.R.attr.editTextStyle);
}

In order to respect the default styling, I modified my construction code for customized widget to the following:

public MyEditText(Context context) {
    super(context);
    initialize();
}

public MyEditText(Context context, AttributeSet attrs) {
    super(context, attrs);
    initialize();
}

public MyEditText(Context mContext, AttributeSet mAttrs, int mDefStyle) {
    super(mContext, mAttrs, mDefStyle);
    initialize();
}

private void initialize() {
    //My custom initialization code
}

This way, I minimize the amount duplicated code and fully respect the framework styling.