Android view layout_width - how to change programmatically?

Question

This is my view, and I wish to change layout_width to "10dip". How do I do so programmatically? Note, this is not a LinearLayout, it's a View.

<View 
    android:id="@+id/nutrition_bar_filled" 
    android:background="@drawable/green_rectangle" 
    android:layout_height="30dp"
    android:layout_width="50dp"/>

I know about LayoutParams. How do I use it to set the width to 10dip?

score 186 · Accepted Answer · edited Dec 23 '18 at 01:05

186

I believe your question is to change only width of view dynamically, whereas above methods will change layout properties completely to new one, so I suggest to getLayoutParams() from view first, then set width on layoutParams, and finally set layoutParams to the view, so following below steps to do the same.

View view = findViewById(R.id.nutrition_bar_filled);
LayoutParams layoutParams = view.getLayoutParams();
layoutParams.width = newWidth;
view.setLayoutParams(layoutParams);

edited Dec 23 '18 at 01:05

Community

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answered Apr 15 '12 at 07:33

jeet

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You can also just do "view_instance.getLayoutParams().width = newOne;" – Tony Wickham May 26 '15 at 18:49
25

to get values like `match_parent`, this works: `LayoutParams.MATCH_PARENT` – Gene Bo Nov 04 '16 at 04:50
@snayde I believe setting the width and height parameters of the View's LayoutParams causes it to be remeasured and laid out – Tony Wickham Mar 01 '17 at 17:16
@TonyWickham looked at the View class implementation, didn't get how it does that :( – sergey.n Mar 01 '17 at 17:56

score 13 · Answer 2 · answered Jan 29 '16 at 12:27

13

Or simply:

view.getLayoutParams().width = 400;
view.requestLayout();

answered Jan 29 '16 at 12:27

M. Usman Khan

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Shankar Agarwal · Answer 3 · 2012-04-15T04:24:24.130

10

try using

View view_instance = (View)findViewById(R.id.nutrition_bar_filled);
view_instance.setWidth(10);

use Layoutparams to do so where you can set width and height like below.

LayoutParams lp = new LayoutParams(10,LayoutParams.wrap_content);
View_instance.setLayoutParams(lp);

edited Apr 15 '12 at 04:24

answered Apr 15 '12 at 04:14

Shankar Agarwal

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can you clarify? I'm almost ready to mark you as right answer. How do I get view_instance? – Henley Apr 15 '12 at 04:16
@Hisoka use `findViewById(R.id.nutrition_bar_filled)` to get the view – Chris Thompson Apr 15 '12 at 04:18
That's the first thing I tried. Seemed very intuitive, yet setWidth is not a valid function for a view. View filledBar = rowView.findViewById(R.id.nutrition_bar_filled); filledBar.setWidth(10) <-- not valid. – Henley Apr 15 '12 at 04:19
3

The method setWidth(int) is undefined for the type View – Henley Apr 15 '12 at 04:21
Ok, I refined my question. I already know about Layout params. My question is how do I use Layout Params to set the width of my View to "10dip". Reading the documentation online, it's not so obvious to me. – Henley Apr 15 '12 at 04:23

score 4 · Answer 4 · answered Nov 24 '21 at 16:08

androidx (core-ktx) contains an extension function to update layout params, for example:

view.updateLayoutParams<ConstraintLayout.LayoutParams> {
    width = ConstraintLayout.LayoutParams.MATCH_PARENT
    // or wrap_content
    width = ConstraintLayout.LayoutParams.WRAP_CONTENT
    // or size measured in pixels
    width = 200 
}

Android view layout_width - how to change programmatically?

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