Problems changing imageView Width by code

Question

When I try to change the width and height of my imageView the app crashes

Java code

final ImageView imageView1 = (ImageView)findViewById(R.id.imageView1);
imageView1.setLayoutParams(new LinearLayout.LayoutParams(50, 50));

The app crashes saying

08-22 15:14:33.670 E/AndroidRuntime(9917): 
java.lang.ClassCastException:android.widget.LinearLayout$LayoutParams cannot be cast to
android.widget.RelativeLayout$LayoutParams

Please indent your code with 4 spaces so it's properly displayed — Squeazer, Aug 22 '14 at 13:18

Squeazer · Accepted Answer · 2014-08-22T13:33:59.297

1

Change

imageView1.setLayoutParams(new LinearLayout.LayoutParams(50, 50));

to

imageView1.setLayoutParams(new RelativeLayout.LayoutParams(50, 50));

The error occurs because your ImageView is inside a RelativeLayout, but you are trying to pass it LinearLayout params.

To keep your other layout modifications, you can try this:

RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) imageView1.getLayoutParams();
layoutParams.height = 50;
layoutParams.width = 50;
imageView1.setLayoutParams(layoutParams);

edited Aug 22 '14 at 13:33

answered Aug 22 '14 at 13:19

Squeazer

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But I've declared in the XML file that it should be centered vertically and horizzontally, but it appear in the top left screen – Alberto Del Villano Aug 22 '14 at 13:29
Check updated answer - if that doesnt work i have another solution, cant test it right now, sorry. – Squeazer Aug 22 '14 at 13:34
Worked! But it's possible to set px width insted of dp? I know is not recommanded, but I need it – Alberto Del Villano Aug 22 '14 at 13:38
Not directly, but you can easily convert px to dp, check this: http://stackoverflow.com/questions/5591868/android-pixels-to-dips – Squeazer Aug 22 '14 at 13:40

Problems changing imageView Width by code

1 Answers1