Develop Reference

How to set the screens size of Grid view to match all screen sizes?

Here i have used a gridview but it is not changing according to the screen size.I think there is a problem with height.the xml used for gridview is given below.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:background="#drawable/bg"
android:orientation="vertical" >
<GridView
android:id="#+id/gridView1"
android:numColumns="3"
android:gravity="center"
android:paddingTop="20dp"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:stretchMode="columnWidth"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_above="#+id/linearLayout1"
android:layout_centerVertical="true"
>
</GridView>
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="vertical" >
<com.assuretech.ku.HorizontalMenuBar
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>

</RelativeLayout>
From what I can see. You need to close the RelativeLayout at the end. I've included my screenshot of your code with it closed. I changed the background to red to see the text.

I guess you are looking for
numColumns = "auto_fit"
as GridView attribute

Firstly you must be using some layout to put your gridview in. Do the following:
Make height and width of the layout to fill parent:
android:layout_width="fill_parent"
android:layout_height="fill_parent"
then, set height and width of your gridview to fill_parent as well.
Well, this is just a supposed solution that you might have been working this way
Hope this works for you.

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="30dp">
<GridView
android:id="#+id/grid_images"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="100dp"
android:gravity="center"
android:horizontalSpacing="10dp"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:verticalSpacing="15dp">
</GridView>
</LinearLayout>

adding button to a gridview in android

I know that it may be a silly question...but I'm new to android...I have an gridview layout in my project and I used "android developer" code for writing the code...so the xml code of layout is like this :
<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="90dp"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>
now I want to add a button to the gridview but I can't do it with drag and drop...I've tried to write the xml code of adding button but I've got this error :
"Error in an XML file: aborting build."
can anyone help me with this problem ?

If you want the Button to be below the GridView, use something like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical" >
<GridView
android:id="#+id/gridFriends"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:clipChildren="true"
android:columnWidth="100dp"
android:gravity="center"
android:numColumns="auto_fit"
android:scrollbars="none"
android:stretchMode="columnWidth" >
</GridView>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingBottom="5dp"
android:paddingLeft="9dp"
android:paddingRight="9dp"
android:paddingTop="5dp" >
<ImageButton
android:id="#+id/imgbtnDemo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center"
android:background="#null"
android:gravity="center"
android:src="#drawable/ic_contact_picture" >
</ImageButton>
</LinearLayout>
</LinearLayout>
If you want a Button in every cell in the GridView, you will have to use a Custom GridView that uses an Adapter. An exmaple XML snippet for the custom cell in the GridView:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mainContainer"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp" >
<FrameLayout
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:gravity="center" >
<ImageView
android:id="#+id/imgProfilePicture"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="#null" />
<ImageButton
android:id="#+id/imgbtnDemo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center"
android:background="#null"
android:gravity="center"
android:src="#drawable/ic_contact_picture" >
</ImageButton>
</FrameLayout>
</RelativeLayout>
NOTE: In the XMLS snippets in the post, I am using ImageButton's. Change them and any necessary attributes to that of a Button. It is merely an illustration. You should be able to connect the dots though. ;-)
if you are familiar with the concept of custom ListViews, with a few modifications, you will be able to implement a custom GridView too. If you are not familiar with custom ListViews or GridViews, follow this tutorial to see how to create a custom GridView: http://www.coderzheaven.com/2012/02/29/custom-gridview-in-android-a-simple-example/.
Or use this Google Search for more tutorials on custom GridView's.
And this is a link to an answer of mine on SO. It has the complete solution. Use what logic suits your purpose.

Center elements in GridView

I have GridView with 6 images in 2 columns. I want to display this 6 images in the middle of the screen. I set gravity properties to center but this center elements only horizontally. GridView takes whole screen.
<GridView
android:id="#+id/gridview"
android:layout_above="#id/ad" android:layout_alignParentTop="true"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="2"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:background="#ffffff"
android:gravity="center"
/>

Here is what I did to get the items in the gridview to center (notice the stretchmode, columnwidth, gravity and horizontal and vertical spacing):
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="5dp" >
<GridView
android:id="#+id/gridview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="100dp"
android:gravity="center"
android:horizontalSpacing="10dp"
android:numColumns="3"
android:stretchMode="spacingWidthUniform"
android:verticalSpacing="10dp" />
</LinearLayout>
It took me a while to figure it out, but messing with those different values I was able to get them to center.

Try wrapping your GridView in a LinearLayout that has it's child elements centered and change your gridview's layout_height to "wrap_content". ex:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:gravity="center"
android:layout_gravity="center">
<GridView
android:id="#+id/homeGridView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:numColumns="3"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center" />
</LinearLayout>

Need to set the following attributes:
android:stretchMode="columnWidth"
...and...
android:gravity="center"

well, in case you are using a custom adapter thing to inflate single rowview inside your gridview then try to add android:gravity="center" to the layout of your single_row.. this will do the trick hopefully :)
i.e,
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="#+id/ivClrBlock"
android:layout_width="88dp"
android:layout_height="88dp"
android:layout_marginBottom="5dp"
android:layout_marginTop="5dp"
/>
<TextView
android:id="#+id/tvClrName"
android:layout_width="88dp"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginTop="5dp"
android:gravity="center"
android:text="#string/color_name"
android:textSize="15sp" />
</LinearLayout>

Issue occurred when I updated the gridview adapter from:
gridView = inflater.inflate(R.layout.mobile, null);
to
gridView = inflater.inflate(R.layout.mobile, parent, false);
so I just reversed back using a try catch if the old (null) version failed.

Try to change this:
android:layout_height="fill_parent"
into
android:layout_height="wrap_content"
You are now telling your grid view to fill it's parent height and width fully.

Here is my answer:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#id/linearLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<GridView
android:id="#+id/gridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="100dip"
android:gravity="center"
android:numColumns="3"
android:stretchMode="spacingWidthUniform"
android:verticalSpacing="10dip" />
</LinearLayout>
Don't use padding or horizontalSpacing if you don't need it as it may cause problems with other views.
Note also that fill_parent is already deprecated.

I hope this will solve your problem:
<LinearLayout
android:layout_gravity="center_horizontal"
android:gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<GridLayout
android:id="#+id/gridlayou4x3"
android:rowCount="4"
android:columnCount="3"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="80"
android:minWidth="25px"
android:minHeight="25px" />
</LinearLayout>

I found that you just have the gridlayout wrap content on height and width.
android:layout_centerHorizontal="true"
It will center itself for the size it needs but if you have it matching the parent. You are technically centering it based with a lot of parent empty space offsetting your children.

GridView and a central column

What I want is a central column using GridView, but everything I try does not work. It always aligns to the left. I have tried messing around with layout_gravity and gravity to no avail.
I have a GridView in a LinearLayout:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<GridView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:numColumns="1"
android:columnWidth="100dp"
android:stretchMode="spacingWidth"
/>
</LinearLayout>

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical">
<GridView
android:layout_width="5px"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:numColumns="1"
android:columnWidth="100dp"
android:stretchMode="spacingWidth"
android:layout_gravity="1"/>
</LinearLayout>
This works fine for me. I changed the gravity to center_vertical and set the gravity of the gridview to 1. I also changed the gridview width just to see if it worked or not. With fill_parent it was hard to see if it was centered or not.

I ended up doing this instead:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<GridView
android:id="#+id/grid_accounts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:verticalSpacing="25dp"
android:listSelector="#color/black"
/>
</FrameLayout>
And made time set the gravity of the images to center

Why can't I add elements after a GridView?

I've got the following layout XML file:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/main_layout" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:orientation="vertical">
<GridView android:id="#+id/main_grid_screen"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:numColumns="auto_fit" android:verticalSpacing="30dp"
android:horizontalSpacing="10dp" android:columnWidth="90dp"
android:stretchMode="columnWidth" android:gravity="center" />
<Button android:id="#+id/clickable_area" android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/view_items_area" />
</LinearLayout>
The GridView shows up perfectly fine; however, the Button below it is completely absent. If I place the Button tag above the GridView, it appears. What gives?

I think it is because of the fill_parent attributes. The GridView is most likely taking up the entire screen and blocking your view of the button. You could try wrap_content instead.