Android, programatically layout a button view?

Question

I am trying to programatically define my program layout and add a button to it at a certain position. I am not using the layout xml as the content view.

RelativeLayout mainLayout;
    mainLayout = new RelativeLayout(this);
    mainLayout.setLayoutParams(new
LayoutParams(LayoutParams.FILL_PARENT,android.view.ViewGroup.LayoutParams.FILL_PARENT));

I have then added a button that I want to apply the properties

layout align center
parent align left
height 60px
width 60px

here is the button so far

Button BtnNext = new Button(this);
    BtnNext.setWidth(60);
    BtnNext.setHeight(60);
    BtnNext.setFocusable(true);
    BtnNext.setId(idBtnNext);
    BtnNext.setText("Next");
    mainLayout.addView(BtnNext, 1);

Height and width DON'T work correctly.

Answer 1

Height and width will not be as u wished because your are not using Density-independent pixel (dip)
The value you set here is in pixel
You can convert the pixel into dip by
final float scale = getResources().getDisplayMetrics().density;
int dip = (int) (60 * scale + 0.5f);
You will get more accurate result

Answer 2

Hi you can try by setting layout params

  RelativeLayout.LayoutParams rel_btn = new RelativeLayout.LayoutParams(
            LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
  rel_btn.height = 60;
  rel_btn.width = 60;
  BtnNext.setLayoutParams(rel_btn);

You can also add rules and set margins for Button by setting relative layout params like

 rel_btn.addRule(RelativeLayout.CENTER_VERTICAL);
 rel_btn.leftMargin = 220;