Develop Reference

Programmatically change height in constraint layout?

I have a simple layout: a fixed height TextView with three ImageView objects anchored to the bottom of the view.
How can I programmatically change the height of each of the ImageViews so they vary within some range (10dp, 16dp below the TextView)? Concretely, my activity gets a list of percentages (between 0 and 1) representing how much of that vertical space each of those "bars" should take up.
I've tried the following without success:
// No visible difference
imgView.setMinHeight(newHeight);
// No change to height, but horizontal constrained was messed up
imgView.setLayoutParams(new LayoutParam(imgView.getWidth(), newHeight);

If by "height" you mean the absolute top-to-bottom dimension of the ImageView, you can do the following to double the height of an ImageView. You can set the height to the value that you want.
ImageView iv = (ImageView) findViewById(R.id.imageView);
ConstraintLayout.LayoutParams lp = (ConstraintLayout.LayoutParams) iv.getLayoutParams();
lp.height = lp.height * 2;
iv.setLayoutParams(lp);
See ConstraintLayout.LayoutParams.
But, if by "height" you mean the vertical position of the ImageView, you can do the following to change the ImageView's vertical bias (assuming that you are using ConstraintLaytout):
ConstraintSet cs = new ConstraintSet();
ConstraintLayout layout = (ConstraintLayout) findViewById(R.id.layout);
cs.clone(layout);
cs.setVerticalBias(R.id.imageView, 0.25f);
cs.applyTo(layout);
See setVerticalBias.
There are other ways to move an ImageView about the layout, but which you use would depend on how your layout is set up.

Framelayout different heights

I have a Activity conainting a header with some buttons(See picture).
You can switch the framelayout by clicking on the buttons. I have the framelayout set on wrap_content in the height for making the whole thing scrollable in a scrollview.
But I want to show only a map in the framelayout if you push on button2. And the height of the map need to be FILL_PARENT INSTEAD of WRAP_CONTENT. So I need to change the heigth of the FRAMELAYOUT.
Any ideas how I can do that?
This is what I tried:
ViewGroup.LayoutParams layoutParams = frameLayout.getLayoutParams();
layoutParams.height = ViewGroup.LayoutParams.MATCH_PARENT;//MATCH_PARENT because FILL_PARENT is deprectated
frameLayout.setLayoutParams(layoutParams);

Android Layout, view height is equal to screen size

in Android how to make a view have same height as its screen size, is it possible to achieve this with only the xml? or if it must use script, tell me how
Thanks.
Sorry for being not clear, and thanks for your reply
but i think, match_parent and fill_parent attribute is not reliable, because when i put the view inside one container or change the view container hierarchy, it won't work.
Here my complete xml layout.
The element i want to make the height sam with device screen is the last list view inside relative layout

No you cannot achieve this in XML only.
As Android supports multiple screen sizes, at runtime you need to check for each device size. The height for each device can be calculated like this:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int height = size.y;
With the above code, you will get the height of the screen and you need to set this height in dp to your view at runtime.
Do this in your activity:
// get view you want to resize
LinearLayout mainLayout = (LinearLayout) findViewById(R.id.main);
// get layout parameters for that view
ViewGroup.LayoutParams params = mainLayout.getLayoutParams();
// change height of the params e.g. 480dp
params.height = 480;
// initialize new parameters for my element
mainLayout.setLayoutParams(new LinearLayout.LayoutParams(params));

This can be possible from xml layout. To do this make the parent layout height and width fill_parent or match_parent and then set each child view width fill_parent or match_parent. Don't set any padding or margin to parent layout. Hope it will work. Here I am giving you an example:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="#+id/btn_swap"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Left or Right" />
<SurfaceView
android:id="#+id/my_surface"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
Attention: If you use ScrollView, you have to set fillViewport="true" otherwise it will not work. A Google engineer said about it before. Check it from here

Display screenDisplay = getActivity().getWindowManager().getDefaultDisplay();
LayoutHeight = screenDisplay.getHeight();
LinearLayout.LayoutParams listLayoutParams = new LinearLayout.LayoutParams(
LayoutHeight, LinearLayout.LayoutParams.WRAP_CONTENT);
view.setLayoutParams(listLayoutParams);

Can I prevent a HorizontalScrollView from expanding?

One of my DialogFragment's layouts uses a HorizontalScrollView to horizontally scroll its child LinearLayout. Is there a way to lock its width into place so that it doesn't expand the width of the DialogFragment once the LinearLayout has been populated with items?
Here's what the DialogFragment looks like when it first loads:
And here's what happens when the LinearLayout under the Kanji header is populated with items:
Everything scrolls fine once the items are populated, but I want to prevent the DialogFragment from expanding. Setting a fixed width on the root of the HorizontalScrollView prevented it from expanding, but I can't think of a good way to do so while taking into account the highly variable size of Android screens.
Here's some code for the area under Kanji:
<HorizontalScrollView
android:layout_height="48dp"
android:layout_width="match_parent">
<LinearLayout
android:id="#+id/grid_kanji"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" />
</HorizontalScrollView>

I got the desired effect by setting the width of the HorizontalScrollView to whatever it was when the dialog first opened:
// Fix the size of the HorizontalScrollView so it doesn't expand
HorizontalScrollView hsv = (HorizontalScrollView) getDialog().findViewById(R.id.grid_kanji_root);
int height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, (float) hsv.getHeight(), getResources().getDisplayMetrics());
int width = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, (float) hsv.getWidth(), getResources().getDisplayMetrics());
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(width, height);
hsv.setLayoutParams(lp);
getWidth() and getHeight() return measurements in pixels, which is why my TypedValue's use COMPLEX_UNIT_PX instead of COMPLEX_UNIT_DP.
Note that you can't do this in onCreateDialog() or onResume() since the width returned will be 0 (zero). I ended up running this code in the function that loads cursor results into the child LinearLayout with a global boolean that keeps track of whether or not I've already set the width - if it's FALSE (as when the dialog first loads), then I set the width and set the boolean to TRUE.
I also discovered that the LayoutParams you apply to a control must match the type of the parent element. Since my HorizontalScrollView is located inside of a LinearLayout, I had to apply LinearLayout.LayoutParams to it instead of HorizontalScrollView.LayoutParams. You'll get a ClassCast Exception otherwise.

Android layoutparms scrollvew height

I have a tableview inside of a scrollview. I want to reserve space for a listview 2/3 of the screen. I am getting the height of the screen, and will divide that in 2/3 and set the height of the ScrollView. But even with manually x and y numbers its blowing up.
App is crashing when I set the ScrollView width and height like this:
ScrollView sv = (ScrollView)findViewById(R.id.usdScroll);
ScrollView.LayoutParams layoutParams = new ScrollView.LayoutParams( -1, 550);
sv.setLayoutParams(layoutParams);
Any ideas what I did wrong?

You can use the layout_weight attribute to specify how much of a view the specific component will use, e.g. android:layout_weight=2. So for your listView set a weight of 1 and a weight of 2 for your tableview, I think. Anyway, play with the weight setting and you can split the view in any ratio you like.

LayoutParams is used to tell their parents how they want to be laid out. So the layout param's type which you set to must match its parent class type exactly.
and here is a better solution, using layout_weight instead. Try this please
<ScrollView android:layout_weight="1" ........></ScrollView>
<ListView android:layout_weight="2" ........></ListView>