How to set a button's parameters programmatically

Question

I'm trying to add a bunch of buttons to a layout like this:

for( int i = 0; i < 10; i++ ) {
    Button button = new Button( this );
    button.setText( "" + i );
    ( ( LinearLayout )dialog.findViewById( R.id.Buttons ) ).addView( button );
}

My problem is how do I do this programmatically to all the buttons:

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:textSize="32dip" />

I've been looking at LayoutParams but it doesn't look complete. Like how do I set the textSize to 32 dip?

dymmeh · Accepted Answer · 2011-11-14T20:54:47.920

20

Set your attributes using the following code:

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
            LayoutParams.WRAP_CONTENT);
button.setLayoutParams(params);
button.setGravity(Gravity.CENTER_HORIZONTAL);
button.setTextSize(32);

If you want to specify the text size units use:

button.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 32);

edited Nov 14 '11 at 20:54

answered Nov 14 '11 at 20:44

dymmeh

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I'm having trouble with the gravity though. setGravity( Gravity.CENTER_HORIZONTAL ) does not do the same as android:layout_gravity="center_horizontal" in the xml file. The xml file button is centered, but not the ones created with setGravity(). – Espen Nov 14 '11 at 21:18
Try this with the layout params: LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, Gravity.CENTER_HORIZONTAL); – dymmeh Nov 14 '11 at 22:08
Or after initializing params call: params.gravity = Gravity.CENTER_HORIZONTAL; – dymmeh Nov 14 '11 at 22:09
The reason setGravity doesn't work the way you want is because android:gravity is different than android:layout_gravity – dymmeh Nov 14 '11 at 22:10
Thanx, but I figured it out. Instead of setting layout_gravity on each button, I set gravity on the parent view LinearLayout. – Espen Nov 14 '11 at 22:10
That works too. Saves you from setting the value on each button. – dymmeh Nov 14 '11 at 22:11

score 4 · Answer 2 · answered Nov 14 '11 at 20:43

LayoutParams relates to the parent ViewGroup which will contain the view. So in your case it's a LinearLayout so you need to create parameters for that one. Here's what I'm talking about:

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
    LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.weight = 1f;

Button button = new Button(this);
button.setLayoutParams(lp);
button.setText("" + i);
((LinearLayout)dialog.findViewById(R.id.Buttons)).addView(button);

score 3 · Answer 3 · answered Nov 14 '11 at 20:41

3

Use LayoutParams for the height, width and gravity with

LinearLayout.LayoutParams (int width, int height)

where you can use WRAP_CONTENT for the ints.

Then there are Button.setGravity() and Button.setTextSize() for the last two.

Hope this helps.

answered Nov 14 '11 at 20:41

Glenn.nz

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How can I specify dip by using Button.setTextSize()? – Espen Nov 14 '11 at 20:49
public void setTextSize (int unit, float size); where unit is "COMPLEX_UNIT_DIP" and size = the text size. – Glenn.nz Nov 17 '11 at 20:11

score 0 · Answer 4 · answered Nov 14 '11 at 20:42

0

You'd use a LayoutParams object for the layout settings, and to set the text size use setTextSize() from the Button class.

You can set the gravity with setGravity() too.

answered Nov 14 '11 at 20:42

John Leehey

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score 0 · Answer 5 · answered Nov 14 '11 at 20:42

0

TextSize is not inside Layout params. To set textSize you have to

button.setTextSize(32);

answered Nov 14 '11 at 20:42

weakwire

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How to set a button's parameters programmatically

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