I'm using the following code to change the height of a relative layout that contains a listview. It works fine the first time I call it, but if i call the same code again later to change the height to a different value it does nothing. Why is this and how do I make it work?
LayoutParams params = myrelativelayout.getLayoutParams();
params.height = newHeight;
Try to add myrelativelayout.setLayoutParams(params); every time you change it. This will make sure the view is invalidated each time and that you update the Actual params object for the view.
Related
How can i get the dynamic width of LinearLayout at runtime?
I mean, i want to get the width of LinearLayout at runtime , when LinearLayout visibility is "GONE" and LinearLayout width is "match_parent" in xml layout file.
I can get width using onGlobalLayoutChangeListener and onPreDrawListener but only if our view(LinearLayout) is already "VISIBLE" state, not at "GONE" state.
Is here any solution for this problem?
Thank you so much for your time.
Simply fetch a reference to your linearlayout lets call it "ll" and a call to "ll.getWidth()" gives you thewidth in pixels...
You can use getMeasuredWidth() method:
int width = yourView.getMeasuredWidth();
PS: Be careful, you need to call it after onMeasure() gets executed, otherwise the view size is not yet measured.
i have a view in my activity and i want to set above of other view programmatically with animation in runtime.
Im trying to get location on screen but it gives me wrong values..
Anyone knows other way?
Try it With RelativeLayout.LayoutParams and add add a Rule: LayoutParams.Above where the anchor is the view which should be below..
and add this Params to your view. I didn't tried it because I'm on the phone. But maybe it gives you a direction till i'm at home. Then if you want I can provide code to support you in a better way. Hope it fits your needs.
Try this:
Animate change width of android RelativeLayout
Or this :
Android - Change left margin using animation
With LayoutParams above instead of width or height. Didn't try it hope it helps...
I have this issue where I have a relative layout that has two child relative layouts (leftpanel and rightpanel). They're inside a custom layout for listview items and each item is updated from a json response from the server. So the size depends on what the server provides.
Issue: I want to have each panel's height to match each other, but it seems that setting layout_height to match_parent doesn't work (actually, if this can be resolved, then no more problems).
What I did: I programmatically set the align top and bottom of each panel to each other -- if the other's bigger, adjust the other one and vice versa. So what I did was to have a view (rightpanel) to listen to rightPanel.getViewTreeObserver().addOnScrollChangedListener(), and call the method below everytime there's a scroll change:
private void updateLayoutAlignmentParams(ViewHolder viewHolder) {
RelativeLayout.LayoutParams leftPanelLayoutParams = (RelativeLayout.LayoutParams)viewHolder.leftPanel.getLayoutParams();
RelativeLayout.LayoutParams rightPanelLayoutParams = (RelativeLayout.LayoutParams)viewHolder.rightPanel.getLayoutParams();
int leftPanelHeight = viewHolder.leftPanel.getHeight();
int rightPanelHeight = viewHolder.rightPanel.getHeight();
if(leftPanelHeight > rightPanelHeight) {
rightPanelLayoutParams.addRule(RelativeLayout.ALIGN_BOTTOM, 0);
rightPanelLayoutParams.addRule(RelativeLayout.ALIGN_TOP, 0);
leftPanelLayoutParams.addRule(RelativeLayout.ALIGN_BOTTOM, viewHolder.rightPanel.getId());
leftPanelLayoutParams.addRule(RelativeLayout.ALIGN_TOP, viewHolder.rightPanel.getId());
} else {
leftPanelLayoutParams.addRule(RelativeLayout.ALIGN_BOTTOM, 0);
leftPanelLayoutParams.addRule(RelativeLayout.ALIGN_TOP, 0);
rightPanelLayoutParams.addRule(RelativeLayout.ALIGN_BOTTOM, viewHolder.leftPanel.getId());
rightPanelLayoutParams.addRule(RelativeLayout.ALIGN_TOP, viewHolder.leftPanel.getId());
}
}
What happens: not all the views get updated while scrolling; so I get a lop-sided listview item where one is bigger than the other vertically but some do adjust well. Odd thing is, when the item gets out of view, it's lop-sided, then gets corrected consistently.
Note: I also tried
addOnDrawListener() - every item is updated but I get an ArrayList out of bounds index but doesn't point to any line in my code. Wouldn't be the best solution anyway as I need to support devices with API < 16.
setOnGlobalLayoutListener() - Nothing happens.
Please let me know if you know why or have a better solution.
Finally [kindof] fixed it! Replaced the whole method with the code below:
private void updateLayoutAlignmentParams(ViewHolder viewHolder) {
viewHolder.rightPanel.setMinimumHeight(viewHolder.leftPanel.getHeight());
viewHolder.leftPanel.setMinimumHeight(viewHolder.rightPanel.getHeight());
}
Although, I was able to achieve having the left and right panel aligned with each other using the code above. I'm now having issues where the previous view's height and width are retained when I switch views. :(
Edit:
Okay, I ended up using LinearLayout to wrap the whole listview item. Not really sure why RelativeLayout isn't complying with match_parent, though.
I'm doing this in Monodroid(C#) but I'm sure most of you understand anyway. I need to move a certain textview in intervalls. The first aligning to its parent left works fine. Then i wait 4 seconds and want it to align right of the parent, which gives no effect at all. It stays left. How come?
Example (C#)
RelativeLayout.LayoutParams newParams = (RelativeLayout.LayoutParams)textView.LayoutParameters;
newParams.AddRule(LayoutRules.AlignParentLeft);
textView.LayoutParameters = newParams;
System.Threading.Thread.Sleep(4000);
RelativeLayout.LayoutParams newParams2 =(RelativeLayout.LayoutParams)textView.LayoutParameters;
newParams2.AddRule(LayoutRules.AlignParentRight);
textView.LayoutParameters = newParams2;
Really odd since it works flawless the 1st time..
after setting new layout parameters, you need to call requestLayout() on your view to take effects.
requestLayout()
Call this when something has changed which has invalidated the layout
of this view. This will schedule a layout pass of the view tree.
so you should call:
textViewToAnimate.requestLayout();
I have bookmark ImageButton with ALIGN_WITH_PARENT set to true in XML.
If I programatically do (I want to remove that rule)
RelativeLayout.LayoutParams params = (LayoutParams) bookmark.getLayoutParams();
params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, 0);
bookmark.setLayoutParams(params);
The rule just doesn't apply (in my layout I can see that rule is still active) -> layout isn't good. If I manually do it (some sort of "simulation", set ALIGN WITH PARENT to false) in my Layout Editor, my layout is fine which leads to this code up there. Something is wrong.
What?
(I believe temporary) Solution is to wrap up that ImageButton in one dummy RelativeLayout and then take the params of that dummy layout and add or remove rules. That way it's working just fine.
Insead of calling setLayoutParams(), try to use requestLayout() method:
bookmark.requestLayout();
From API docs:
Call this when something has changed which has invalidated the layout of this view. This will schedule a layout pass of the view tree.
simply call removeRule() function on params.
for example,
params.removeRule(RelativeLayout.CENTER_IN_PARENT);