Develop Reference

How to change the height of an image_view at runtime

I tried IMAGEVIEW.getLayoutParams().height = 200. But it is not changing correctly. Is there any other possible way, please give suggestion.

use this
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(200, 200);
yourImageView.setLayoutParams(layoutParams);

_image_view.getLayoutParams().height = 30;
Hope this helps.
Very Important.
If you're setting the height after the layout has already been 'laid out',
make sure you also call this :
_image_view.requestLayout()

ImageView mImageView = (ImageView)findViewById(R.id.image_view);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100, 100); // Paramters are (width, height) in pixels
mImageView.setLayoutParams(layoutParams);
If you want multiple resolution compatibility,
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams((int)(getResources().getDimension(R.dimen.image_with)),
(int) getResources().getDimension(R.dimen.image_height));
dimens.xml under resource
<?xml version="1.0" encoding="utf-8"?>
<resources>
<dimen name="image_with">100dp</dimen>
<dimen name="image_height">100dp</dimen>
</resources>

If your imageview already shows the image,
Call:
image_view.requestLayout();

At First Check Set ImageView width and height programmatically
You can try with DisplayMetrics Logic .Its more perfect .
A structure describing general information about a display, such as
its size, density, and font scaling.
DisplayMetrics metrics = getResources().getDisplayMetrics();
int DeviceTotalWidth = metrics.widthPixels;
int DeviceTotalHeight = metrics.heightPixels;
image_view.getLayoutParams().height= (int) (DeviceTotalHeight*5.25/100); // You can change from here
Another Way
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(200, 200);
IMAGEVIEW.setLayoutParams(layoutParams);

Have an ImageView with a default height, change height when an image is put into it

So I am making an app that holds multiple user-chosen pictures. I have default ImageViews with pre-set heights of 300dp. I want this height to change to wrap_content once an image has been placed into the ImageView. The only way I know to do this is to remove the image from the layout and then re-add it with a new LayoutParams, but this messes up the order of the other views in my layout. Can I change the height without removing it?
Essentially:
LinearLayout mainLayout = (LinearLayout) findViewById(R.id.mainLayout);
final float scale = getResources().getDisplayMetrics().density;
LinearLayout.LayoutParams mTestImgParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
(int) Math.ceil(scale * 300)
);
final ImageView createdView = new ImageView(this);
mainLayout.addView(createdView, mTestImgParams);
//onLongClick listener, get picture, set the picture into the imageview, etc.
I somehow want to change the
(int) Math.ceil(scale*300)
to
LinearLayout.LayoutParams.WRAP_CONTENT
without removing and re-adding the ImageView, and only after the image has been placed. Help please.

You could try to get the current layout params and change it.
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) createdView.getLayoutParams();
params.height = LayoutParams.WRAP_CONTENT;
createdView.setLayoutParams(params);

How to programmatically set the width of the LinearLayout?

Is the source of the slider and the lesson link:
http://www.oodlestechnologies.com/blogs/Facebook-Style-Slide-Menu-In-Android
In this case, the width of the file "left_menu.xml" determined TextView (android:layout_width="260dp")
How do I set the width to "LinearLayout" file "left_menu.xml" depending on the device screen? For example, I want the width of the "LinearLayout" was always 1/3 of the screen device? Or any way to set the width of the TextView 1/3 of the width of the device screen.

To set the LinearLayout or TextView width to 1/3 of the device screen:
first of all get the device screen width:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
try {
display.getRealSize(size);
} catch (NoSuchMethodError err) {
display.getSize(size);
}
int width = size.x;
int height = size.y;
now just create a LayoutParams and set it to the Text:
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams((int)(width/3),
LinearLayout.LayoutParams.WRAP_CONTENT); // or set height to any fixed value you want
your_layout.setLayoutParams(lp);
// OR
your_textView.setLayoutParams(lp);

LinearLayout linear = (LinearLayout) findViewById(R.id.ll);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
linear.setLayoutParams(params);
As you can see, you can set Integer values for the LinearLayout.LayoutParams() constructor, like this:
LinearLayout.LayoutParams cellParams = new LinearLayout.LayoutParams(0, 100);
The costructor wants pixels and not dp(Density Pixels), here's a formula to convert PXs from DPs:
(int) (<numberOfDPs> * getContext().getResources().getDisplayMetrics().density + 0.5f)

LinearLayout layout = (LinearLayout)findViewById(R.id.ll);
LayoutParams params = (LayoutParams) layout.getLayoutParams();
params.height = 100;
params.width = 100;

The above answers are correct. I'll just suggest future readers to take a look at their xml layout file and be sure that the LinearLayout element is not using weight attribute. If so, consider updating weight in your LayoutParams object.
Another good practice is to retrieve the layout params object from the view you're trying to adjust, instead of creating one from scratch and having to set all the values.

LinearLayout YOUR_LinearLayout =(LinearLayout)findViewById(R.id.YOUR_LinearLayout)
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
/*width*/ ViewGroup.LayoutParams.MATCH_PARENT,
/*height*/ 100,
/*weight*/ 1.0f
);
YOUR_LinearLayout.setLayoutParams(param);

The easy way to do that, set value of layoutParams, and please notice this size is not in DP.
view.layoutParams.width = 400;
view.layoutParams.height = 150;
view.requestLayout();

finding the height and width of the dynamically created Imageview ?

LayoutParams params = new FrameLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
imageView
mainimage = new ImageView(HLActivity.this);
mainimage.setLayoutParams(params);
loader.DisplayImage(_pageslist.get(j).getUrl(), mainimage);
I already tried mainimage.getwidth() and mainimage.getHeight();
Now i want to findout the orignalwidth and height of the ImageView after
place the image in the imageview. can you please help me.

getWidth() and getHeight() are the indeed ones you are looking for, but you are trying to ask for the width and the height when the view is not measured yet. To fix this, we post a message to the ImageView, which will get executed after the measurement is done.
LayoutParams params = new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
// mark it as final, so it can be accessed in the runnable.
final imageView mainimage = new ImageView(HLActivity.this);
mainimage.setLayoutParams(params);
mainimage.post(new Runnable() {
#Override
public void run() {
// get the width and the height
int width = mainimage.getWidth();
int height = mainimage.getHeight();
// do what you want to do with the sizes.
loader.DisplayImage(_pageslist.get(j).getUrl(), mainimage);
}
});

android RelativeLayout change height programmatically

I try change layout height programmatically. I have two buttons. In one button I change my layout position and second button I try to receive save position witch I was first time.
<RelativeLayout
android:id="#+id/popaplayout"
android:layout_width="fill_parent"
android:layout_height="200dp" >
This is a my layout
and in first button I wrote
RelativeLayout.LayoutParams parms = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.FILL_PARENT,
RelativeLayout.LayoutParams.FILL_PARENT);
parms.addRule(RelativeLayout.BELOW, R.id.movies_title_layout);
scrollpopap.setLayoutParams(parms);
scrollpopap.setScrollingEnabled(true);
and second button
RelativeLayout.LayoutParams rel_btn = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, 300);
rel_btn.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
scrollpopap.setLayoutParams(rel_btn);
scrollpopap.setScrollingEnabled(false);
In xml file I wrote height 200dp and programmatically 300 and there are different height. How I can wrote save height in programmatically?
if anyone knows solution please help me
thanks

First convert 200 dp into pixels -
final float scale = getContext().getResources().getDisplayMetrics().density;
int pixels = (int) (200 * scale + 0.5f);
Then set programatically,
RelativeLayout.LayoutParams rel_btn = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, pixels);
rel_btn.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
scrollpopap.setLayoutParams(rel_btn);
scrollpopap.setScrollingEnabled(false);

Convert DP to PX like this.
final float scale = getContext().getResources().getDisplayMetrics().density;
int px = (int) (100 * scale + 0.5f); // replace 100 with your dimensions
Set Some layout_gravity of relative layout. and Change height and width by java code.
RelativeLayout rl = (RelativeLayout) findViewById(R.id.yourId);
rl.getLayoutParams().height = px;
rl.getLayoutParams().width = px;

If you intending to change RelativeLayout height, then this help.
RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.yourId);
relativeLayout.getLayoutParams().height = 100;
relativeLayout.getLayoutParams().width = 100;

Use this
RelativeLayout layout = (RelativeLayout) findViewById(R.id.yourlayout_id);
// Gets the layout params that will allow you to resize the layout
LayoutParams params = layout.getLayoutParams();
params.height = 320;
params.width = 320;

For Kotlin Users who want to set Height & Width from Dimens file, use this:
relativeLayout.layoutParams.width = relativeLayout.context
.resources.getDimensionPixelSize(R.dimen.width)
relativeLayout.layoutParams.height = relativeLayout.context
.resources.getDimensionPixelSize(R.dimen.height)