Strange beavior with LayoutParams

Question

I am currently playing around a bit with code generated Layouts. There I recogniced a problem in this part of code:

dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); int dp_x = (dm.widthPixels - 32) / 10; for(int x = 0; x < 9; x++) { TableRow tr = new TableRow(this); tr.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); for(int y = 0; y < 9; y++) { ImageView i = new ImageView(this); i.setClickable(true); i.setLayoutParams(new LayoutParams(dp_x, dp_x)); i.setScaleType(ScaleType.FIT_XY); i.setImageDrawable(getResources().getDrawable(R.drawable.i0)); iv[x][y] = i; tr.addView(iv[x][y]); } fieldLayout.addView(tr); }

Especially this line seems to cause the problem:

i.setLayoutParams(new LayoutParams(dp_x, dp_x));

When this line is commented out everything is displayed correctly. But as soon as I uncomment it not a single one of the ImageViews is displayed. I looked into debugging and every value seems to be added correctly to the ImageView. Any Idea, what causes this error?

Another thing is - I know DisplayMetrics and their width/height are discouraged to use. Here I use it to scale the ImageViews in dependence to the display. Can I achieve this in another way, too?

Any Idea, what causes this error? - always use the proper LayoutParams(the ones of the parent, TableRow in your case) instead of just LayoutParams. — user
– user, Commented Jul 9, 2013 at 6:49

Danish Ashfaq · Accepted Answer · 2013-07-09 10:01:48Z

1

Assuming your dp_x and dp_y values are correct :

TableRow.LayoutParams layoutParams = new TableRow.LayoutParams(dp_x, dp_y); i.setLayoutParams(layoutParams);

It seems like it doesn't change anything but it worked for me ! Maybe because the LayoutParams are more specific (TableRow.LayoutParams)

Hope this helps !

edited Jul 9, 2013 at 10:01

answered Jul 9, 2013 at 6:46

Danish Ashfaq

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2 Comments

Jochen Birkle Over a year ago

Right, TableRow.LayoutParams() actually worked. Didn't know that I had to use the specific ones of the Parent...

Danish Ashfaq Over a year ago

Glad I could help ! I changed the LinearLayout to TableRow so the answer is more accurate.

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