Develop Reference

Gridview scroll width

I have this Gridview
<GridView
android:id="#+id/gridview_example"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="20dp"
android:layout_marginLeft="45dp"
android:layout_marginRight="45dp"
android:layout_marginTop="35dp"
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:numColumns="3"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:fadeScrollbars="false"
android:scrollbarStyle="outsideInset"
android:scrollbarSize="30dp"
android:smoothScrollbar="true">
</GridView>
for which I'm trying to increase the scroll width. I've tried using scrollbarSize but nothing changes. Is there a way to increase the width of the scrollbar without customizing it?
I'm new in Android development so please be gentle :)
Update: Tested this possible solution and added my gridview inside the scrollview
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="20dp"
android:layout_marginLeft="45dp"
android:layout_marginRight="45dp"
android:layout_marginTop="35dp"
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:layout_above="#+id/bottomMenu"
android:scrollbarSize="50dip">
<GridView
android:id="#+id/gridview_holes"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="3"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp">
</GridView>
</ScrollView>
But the gridview is much more smaller and I'm seeing just the gridview thin scroll.

please try this
android:scrollbarAlwaysDrawVerticalTrack=true
android:scrollbars=vertical

use Scrollview for scrolling sub view
https://developer.android.com/reference/android/widget/ScrollView.html

Using Gridview and Button in LinearLayout

I tried add button below gridview in linearlayout at following code. But when i execute my app i only see gridview there is no button item. So it may basic mistake but i can't see it.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:background="#2a2a2a"
>
<GridView
android:id="#+id/grid_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:columnWidth="150dp"
android:numColumns="auto_fit"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"></GridView>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:text="#string/cam_string" />
</LinearLayout>

Change the orientation of your LinearLayout to vertical. I suspect you're not seeing the Button because the GridView takes up all horizontal space, then the LinearLayout adds the Button in a place off the screen that's not visible. You also may want to change the layout_height of the GridView to "0dip" and give it the `android:layout_weight=1' attribute so that it will fill all space except that taken up by the Button.

Other than the suggested Solution by others you can try the alternative using relative layout.
You can use a RelativeLayout for this purpose instead of LinearLayout.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#2a2a2a" >
<GridView
android:id="#+id/grid_view"
android:layout_above="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:columnWidth="150dp"
android:numColumns="auto_fit"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"></GridView>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="#string/cam_string" />
</RelativeLayout>

Group More Than One Controls At Android

I had created a window with RelativeLayout and insterted two controls in it; one is GridView and the other one is WebView.
I will bind images to gridview to use like menu and i will load a html page in webview for ads.
But i have problems with these controls.
For example, if user scrolls gridview vertically it is disappearing behind webview however, in that i was expecting webview was slide with gridview too when user scroll gridview.
So i wonder, can i group these controls together to act simultaneously?
My another problem with orientation, when i turn my device to landscape mode webview is disappearing from screen.
Lastly if i set GridView's layout_height attribute fill_parent, i can't see WebView, so i set it as wrap_content. But this time WebView doesn't align at bottom, it aligns at GridView's after and there is space between screen bottom and webview.
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/bg480480">
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gridview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:numColumns="auto_fit"
android:verticalSpacing="45dp"
android:horizontalSpacing="10dp"
android:columnWidth="150dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:layout_marginTop="30dp"
android:scrollbars="none"
android:layout_alignParentTop="true" />
<WebView
android:id="#+id/webView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="centerInside"
android:gravity="bottom"
android:layout_below="#id/gridview" />
</RelativeLayout>
Here are some screen shots.

I guess the main problem is that both the GridView and the Webview specify layout_height="fill_parent". I guess you probably don't want the GridView to fill the whole parent area, so use "wrap_content" instead.
I don't know enough of the desired layout of the page but I would recommend using a LinearLayout to start and get comfortable. It really depends what the grid view and the web view should show and where your main content is.
In the example below I have simply assumed that your web view wants to take up the majority of the screen.
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gridview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#ff0000"
android:numColumns="auto_fit"
android:verticalSpacing="45dp"
android:horizontalSpacing="10dp"
android:columnWidth="150dp"
android:stretchMode="columnWidth"
android:layout_marginTop="30dp"
android:scrollbars="none"
/>
<WebView
android:id="#+id/webView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00ff00"
android:scaleType="centerInside" />
</LinearLayout>
If the assumption is not correct then you would probably specify it the other way round (Webview=>wrap_conent)

Improve the WebView layout code as below:
<GridView
android:id="#+id/gridview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/webView1"
android:layout_alignParentTop="true"
android:layout_marginTop="30dp"
android:columnWidth="150dp"
android:gravity="center"
android:horizontalSpacing="10dp"
android:numColumns="auto_fit"
android:scrollbars="none"
android:stretchMode="columnWidth"
android:verticalSpacing="45dp" />
<WebView
android:id="#+id/webView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="bottom"
android:scaleType="centerInside" />
FYI, android:layout_alignParentBottom="true" will display WebView at the bottom of the screen. and include android:layout_above="#+id/webView1" inside the GridView.
Give a try to this layout code.

You need to add
android:layout_above="#+id/webView1"
in your gridview
also
android:layout_alignParentBottom="true"
in your webview
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/bg480480"
android:orientation="vertical"
>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gridview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:numColumns="auto_fit"
android:verticalSpacing="45dp"
android:horizontalSpacing="10dp"
android:columnWidth="150dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:layout_above="#+id/webView1"
android:layout_marginTop="30dp"
android:scrollbars="none"
android:layout_alignParentTop="true" />
<WebView
android:id="#+id/webView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_below="#id/gridview" />
</RelativeLayout>

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.

How to display an ImageView above and below a GridView?

I'm trying to display an image above and below a grid. This is the initial screen with Logo on top, 4 buttons as a grid view then image on the bottom. With my current code the bottom image is not displaying at all. Also I would like to stick the bottom image "bottomboxes" to the bottom of the display.
<ImageView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:paddingTop="20dp"
android:src="#drawable/stuffbox"
android:gravity="center"/>
<GridView
android:id="#+id/gridview"
android:paddingTop="10dp"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="40dp"
android:numColumns="2"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"/>
<ImageView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="#drawable/bottomboxes"
android:paddingTop="20dp"
/>
</LinearLayout>

Your current layout has the GridView set to fill_parent both directions. This will force the gridview to fill the entire linearlayout and push the other views away.
Instead you should put:
<GridView
android:id="#+id/gridview"
android:paddingTop="10dp"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:columnWidth="40dp"
android:numColumns="2"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"/>
The lines android:layout_height="0" and android:layout_weight="1" tell the gridview to fill the remaining available space in the layout, while still allowing the imageviews to have their place.