CODEWITHSUNDEEP
android
ctarimli
ctarimli

Reputation: 322

Setting LayoutParams programmatically

I want to set my LinearLayout's parameters after all of the views' parameters are calculated.

I am trying to set LinearLayout's height related to the parent view's height. And parent view's height is calculated according to its layout_weight, so I get the height by getMeasuredHeight();

My code :

@Override
public void onWindowFocusChanged(boolean hasFocus) {

  super.onWindowFocusChanged(hasFocus);
  RelativeLayout lay = (RelativeLayout) findViewById(R.id.alt);
  LinearLayout bar = (LinearLayout) findViewById(R.id.barLay);

  int layH = lay.getMeasuredHeight();
  int barH = layH / 4;
  LinearLayout.LayoutParams params = (LayoutParams) bar.getLayoutParams();
  params.height = barH;
  bar.setLayoutParams(params);
}

Eclipse Debugger stops the program at this line;

LinearLayout.LayoutParams params = (LayoutParams) bar.getLayoutParams();

I can't find what could be the problem? Am I doing something wrong to set params?

Upvotes: 0

Views: 3554

Answers (3)

Jeremy Dowdall
Jeremy Dowdall

Reputation: 1274

The type of LayoutParams are actually set by the parent of the view, so bar.getLayoutParams() should be returning an object of type RelativeLayout.LayoutParams. With an explicit cast to LinearLayout.LayoutParams I'd expect your logcat to contain a line like this:

Caused by: java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams

Changing it to this should do the trick:

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) bar.getLayoutParams();

or, since height is in the base class, don't cast it at all:

ViewGroup.LayoutParams params = bar.getLayoutParams();

Upvotes: 1

ctarimli
ctarimli

Reputation: 322

After @LocHa asked me the type of the layouts, I try changing the parent layout's type to LinearLayout which was RelativeLayout, and finally it worked for me.

Upvotes: 0

user1282637
user1282637

Reputation: 1867

Try changing this 

LinearLayout.LayoutParams params = (LayoutParams) bar.getLayoutParams();

to this

LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) bar.getLayoutParams();

Upvotes: 0

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