Develop Reference

GridView items: set relative sizes

I'm trying to display some items in a GridView. I want each item to fill a relative part of the screen (image B) and all I have is GridView take just the space it needs at the top of the screen (image A). The image:
(I want each item sizes over 15-20% height of the main layout)
EDIT : I found this question Percentage width in a RelativeLayout. 'LadaRaider' gives a good answer but I don't know how to use that solution in my GridView cells. This is my layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/background">
<TextView
android:id="#+id/label_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:gravity="center_horizontal"/>
<LinearLayout
android:id="#+id/ll_ok"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/lbl_choose"
android:textAppearance="?android:attr/textAppearanceMedium" />
<GridView
android:id="#+id/grid"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="2"
android:columnWidth="100dp"
android:stretchMode="columnWidth"/>
</LinearLayout>
<LinearLayout
android:id="#+id/ll_wait"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/lbl_wait"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
</LinearLayout>
I have also created a custom layout to use in GridView items. It has just a TextView and a background.

Android: how to split a screen for a TableLayout next to a LinearLayout?

How can I split the screen so that the left half of the screen is a Linearlayout and the right half is a Tablelayout.
I've tried applying a layout_weight of 1 to both and a weightSum of 2 to the RelativeLayout wrapper.
Can anyone guide me?
This is what I got so far:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="2"
>
<LinearLayout android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1">
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:text="#string/hello2" />
</LinearLayout>
<TableLayout
android:id="#+id/Row1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:layout_alignParentRight="true"
>
<TableRow>
<Button android:id="#+id/Modus"
android:text="#string/Mode1"
android:background="#layout/modus_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
/>
<Button android:id="#+id/Modus"
android:text="#string/Mode2"
android:background="#layout/modus_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
/>
</TableRow>
</TableLayout>
</RelativeLayout>

Give an id to your LinearLayout and add android:layout_toRightOf="#+id/your_linear_layout" parameter to your TableLayout. Or you may use another LinearLayout instead of RelativeLayout. If you don't need to add more views LinearLayout could be better.

proportional row size with 1 fixed row

In Android, I'm trying to basically create a table with 2 rows, where 1 row is say 10 pixels, and the other takes the rest of the screen. In silverlight, this is equivalent of a table with 2 rows, one on "Auto" and the other set to "*".
Is there any way to do this? I have been playing with the layout weight, but this is always a percentage, and I would like 1 row to be fixed size (wrap_content basically).
Any ideas?
edit:
I tried what was suggested, but it'snot working.. So I want the first row to take up the entire space, except what row 2 took up. Row 2 consists of 2 buttons side by side, Row 1 is just a ListView. Here is what I have:
<LinearLayout android:orientation="horizontal"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:layout_weight="1" android:background="#FF0000">
<ListView android:id="#+id/edit_group_listView"
android:layout_width="fill_parent" android:layout_height="fill_parent" />
</LinearLayout>
<LinearLayout android:orientation="horizontal"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:layout_weight="0" android:background="#FFFF00">
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="fill_parent"
android:layout_height="50dip" android:stretchColumns="2">
<TableRow>
<Button android:text="#string/button_save" android:id="#+id/edit_group_save"
android:layout_width="150dip" android:layout_height="50dip"
android:enabled="false" android:layout_column="1"></Button>
<Button android:text="#string/button_cancel" android:id="#+id/edit_group_cancel"
android:layout_width="150dip" android:layout_height="50dip"
android:layout_column="3"></Button>
</TableRow>
</TableLayout>
</LinearLayout>
When I view this all I see is the yellow linearlayout (the buttons), no listview at all. The listview has 50 items, and I can confirm it's visible by taking it out of this setup.

Yep, easy actually.
First cell must have the weight of 0. Second cell must have the weight of 1 and fill the parent by width. That way it will take up the remaning space within the container it's in.
Easy! Here's an example for your convenience
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_weight="0" android:background="#FF0000">
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="SomeText" android:id="#+id/theview"/>
</LinearLayout>
<LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" android:background="#FFFF00">
</LinearLayout>
</LinearLayout>
=======================================
UPDATE
Mate you overcomplicated it like Crayze!
First. You don't need a table layout for that.
Second the problem is you set both heights of the layout to fill_parrent. So they are both fighting over for the screen size. To fix this you just have to set both the layout sizes to wrap_content. That will work just fine. Here have an example, without the table on your code.
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:layout_weight="1" android:background="#FF0000">
<ListView android:id="#+id/edit_group_listView"
android:layout_width="fill_parent" android:layout_height="fill_parent" />
</LinearLayout>
<LinearLayout android:orientation="horizontal"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_weight="0" android:background="#FFFF00">
<Button android:text="#string/button_save" android:id="#+id/edit_group_save"
android:layout_width="150dip" android:layout_height="50dip"
android:enabled="false" android:layout_column="1"></Button>
<Button android:text="#string/button_cancel" android:id="#+id/edit_group_cancel"
android:layout_width="150dip" android:layout_height="50dip"
android:layout_column="3"></Button>
</LinearLayout>

Use layout weight and set the fixed one to be 0, and the other one to be any number.

Okay so actually I figured this out by reviewing what Taranasus wrote, which was accurate to a degree.
This is the final XML that worked:
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:layout_weight="1" android:background="#FF0000">
<ListView android:id="#+id/edit_group_listView"
android:layout_width="fill_parent" android:layout_height="fill_parent" />
</LinearLayout>
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_weight="0" android:background="#FFFF00">
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="fill_parent"
android:layout_height="50dip" android:stretchColumns="2">
<TableRow>
<Button android:text="#string/button_save" android:id="#+id/edit_group_save"
android:layout_width="150dip" android:layout_height="50dip"
android:enabled="false" android:layout_column="1"></Button>
<Button android:text="#string/button_cancel" android:id="#+id/edit_group_cancel"
android:layout_width="150dip" android:layout_height="50dip"
android:layout_column="3"></Button>
</TableRow>
</TableLayout>
</LinearLayout>
This site also helped: http://www.curious-creature.org/2009/02/22/android-layout-tricks-1/
The problems were that:
1. The orientation had to be "vertical", which actually doesn't make sense according to the docs.
2. The second row (the fixed one) has to have a height of wrap_content, which also doesn't make sense since Google docs about weight specifically say both elements should be fill_parent.

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.

Android layout issue - relative widths in percent using weight

I am trying to assign relative widths to columns in a ListView that is in a TabHost, using layout_weight as suggested here:
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TabWidget android:id="#android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<FrameLayout android:id="#android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableLayout
android:id="#+id/triplist"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="4px">
<TableRow>
<ListView android:id="#+id/triplistview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</TableRow>
<TableRow>
<Button android:id="#+id/newtripbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Trip"/>
</TableRow>
[other tabs ...]
My row definition has 4 columns that I would like to size as follows:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="1.0"
android:padding="4px">
<TextView android:id="#+id/rowtripdate"
android:layout_weight=".2"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:inputType="date"/>
<TextView android:id="#+id/rowodostart"
android:layout_weight=".2"
android:layout_width="0dip"
android:layout_height="wrap_content"/>
<TextView android:id="#+id/rowodoend"
android:layout_weight=".2"
android:layout_width="0dip"
android:layout_height="wrap_content"/>
<TextView android:id="#+id/rowcomment"
android:layout_weight=".4"
android:layout_width="0dip"
android:layout_height="wrap_content">
Unfortunately, it seems to want to fit all the columns into the space that the button occupies, as opposed to the width of the screen. Or maybe there is another constraint that I do not understand. I'd appreciate your help.
(source: heeroz.com)

I think I forgot this property for the TableLayout element:
android:stretchColumns="0"
It appears to be working now.

I don't see anything obviously wrong in what you are showing there. To get a better picture of what is going on, you might try out the heirarchy viewer. It comes with the SDK. It will visualize for you how much space each of the "hidden" layers is taking, so you can figure out which one decided to only be that big.