How to read android default attributes of a View in java code

Question

I want to have a custom TextView called MyTextView and i want to set a default TextSize in it's constructor only if no TextSize has been set in it's XML definition. How can i detect if a TextSize has been set in it's XML definition?

public class MyTextView extends TextView{    
    public MyTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        //How can i read TextSize from AttribureSet??
        //if no TextSize has been set then SetTextSize(defaultTextSize);
    } 
}

Can any one help me please?

This Question (and Answer) should be just the same as http://stackoverflow.com/questions/8302229/accessing-attrs-in-attributeset-for-custom-components — hata, Jan 19 '15 at 13:35

score 2 · Accepted Answer · answered Jan 19 '15 at 13:30

2

You can obtain style attributes like

public class MyTextView extends TextView{    
    public MyTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
         String size = attrs.getAttributeValue("http://schemas.android.com/apk/res/android", "textSize");
    } 
}

answered Jan 19 '15 at 13:30

Murtaza Khursheed Hussain

15,176
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Thank you, this returns exactly the string which has been set in xml definition like "12.0sp" or null or something like this. Thank you :) – Mansour Jan 20 '15 at 11:20

score 0 · Answer 2 · answered Jan 19 '15 at 13:27

0

Here's example:

final Resources.Theme theme = context.getTheme();
TypedArray array = theme.obtainStyledAttributes(attrs, R.styleable.YourStylable, R.attr.YourDefStyleAttr, 0);

answered Jan 19 '15 at 13:27

Fedor Kazakov

601
3
12

this only works if custom attributes are set. not the default. – Murtaza Khursheed Hussain Jan 19 '15 at 13:29
Thank you, but i want to now about default attributes and not custom attributes. – Mansour Jan 20 '15 at 11:18

score 0 · Answer 3 · answered Jan 19 '15 at 18:16

0

Try this float size = new TextView(this).getTextSize();

answered Jan 19 '15 at 18:16

QArea

4,955
1
12
22

I think this returns the textSize and cannot recognize it is the default textSize or it has been set in the xml layout file. – Mansour Jan 20 '15 at 11:25

How to read android default attributes of a View in java code

3 Answers3