Change Relative layout width and height dynamically

18
votes

Hi i am using following layout structure inside LinearLayout

<TableLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <TableRow
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
    </TableRow>

    <TableRow
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/tv1"
            android:layout_height="wrap_content"
            android:gravity="left"
            android:paddingLeft="10dp"
            android:textColor="#000" />

        <TextView
            android:id="@+id/tv2"
            android:layout_height="wrap_content"
            android:layout_weight="1.0"
            android:gravity="right"
            android:paddingRight="10dp"
            android:textColor="#000" />
    </TableRow>
</TableLayout>

<ImageView
    android:id="@+id/img1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" />

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="320px"
    android:layout_height="320px"
    android:gravity="center" >
</RelativeLayout>

and want to set relative layout width and height dynamically from java file instead of setting it to 320px in the xml file but not able to do that , Orientation change is not an issue for as i restricting it to only in Portrait mode. It is possible to set the relative layout on full screen by using match_parent but i have to put another views on the screen so is it possible or i have to achieve it another way...

7
androidandroid-layout
To set the layout width dynamically you will have to extend the RelativeLayout class from a class that you created and override the onMeasure method - the-ginger-geek
Thanks for reply , I have tried every thing and it's giving class cast exception when i try to set the width and height dynamically. The relative layout also contain other child as image views so i take it as View Group in java file but unable to do that . - Vikas Panwar
Please post the exception and the code where it points to - the-ginger-geek
this is the code .. ViewGroup container = (ViewGroup) this.findViewById(R.id.containerr); i am accessing that Relative layout as ViewGroup where containerr is the id of the relative layout in the xml file. - Vikas Panwar
if i set the layoutparams to container it shows error.. Java.lang.ClassCastException:RelativeLayout&LayoutParams cannot be cast to LinearLayout&LayoutParams - Vikas Panwar

7 Answers

26
votes

Android does NOT refresh layout of views with wrap_content once it has been displayed. Even with invalidate() or requestLayout(). So if you add a child view, or modify the content dynamically, you're screwed.

getLayoutParams().height = x plus requestLayout() are a good solution if you know the "x", and if you need to do it ONLY ONCE. After that the wrap_content in LayoutParams is lost, since you have overridden it.

To solve that, I've written a static class that recomputes the sizes and forces the update of the layout for the views with wrap_content. The code and instructions to use are available here:

https://github.com/ea167/android-layout-wrap-content-updater

Enjoy!

17
votes

try using this

getLayoutParams().height= x;
requestLayout(); or invalidate();
7
votes

give an id to your relative layout in .xml :

android:id="@+id/relativelayout"

now in your java file write this:

RelativeLayout Rl = (RelativeLayout) findViewById(R.id.relativelayout);

RelativeLayout.LayoutParams layout_description = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT or YourUserDefinedwidth,
                        RelativeLayout.LayoutParams.FILL_PARENT or YourUserDefinedHeight);

Rl.setLayoutParams(layout_description);
2
votes

From below code u can get device height and width:-

Display display = getWindowManager().getDefaultDisplay();
    int width = (display.getWidth() );
    int height = (display.getHeight() );

paramsTop ur realative layout:-

Now u can set height or width what you want.

        paramsTop = new RelativeLayout.LayoutParams(width, height);
2
votes

You can set views dimensions dynamically using LayoutParams. Something like 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;
2
votes

I faced this problem, the best solution for Change Relative layout width and height dynamically like this

RelativeLayout relMain = (RelativeLayout) convertView.findViewById(R.id.relMain);
    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
    params.width =200;
 params.height =200;
 params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        relMain.setLayoutParams(params);
1
votes

If you intending to change Height, then this would make a trick. 

RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.yourId);
relativeLayout.getLayoutParams().height = 100;
relativeLayout.getLayoutParams().width = 100;