Develop Reference

layout_gravity isn't working as expected - just partially

I have the following layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="start"
android:text="#string/title_day"
android:textStyle="bold"
android:textSize="20sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="start"
android:text="Tuesday"
android:textSize="16sp" />
</LinearLayout>
<TextView
android:id="#+id/tv_fail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+22"
android:textSize="16sp"
android:layout_gravity="end|center_vertical" />
</LinearLayout>
</LinearLayout>
And this looks like this:
And I want the last TextView with id tv_fail to be pinned to right end of screen. I suppose that
android:layout_gravity="end|center_vertical"
should handle it, but this instruction centers TextView vertically, but doesn't move it to end. How to fix it?

I suppose that
android:layout_gravity="end|center_vertical"
should handle it, but this instruction centers TextView vertically, but doesn't move it to end.
This is due to how LinearLayout works; your understanding of layout_gravity is generally correct.
LinearLayout takes its children and lays them out in a line, and the children will all be packed towards the "start" of the LinearLayout. In other words, a horizontal LinearLayout will ignore the horizontal component of the layout_gravity attribute of a child.
There are a few ways to work around this. The one that I think works best for your scenario is to make the TextView stretch to fill all the remaining space in the LinearLayout (using layout_weight), and then have the TextView position its text at the end of its content area (using gravity).
<TextView
android:id="#+id/tv_fail"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="+22"
android:textSize="16sp"
android:layout_gravity="center_vertical"
android:gravity="end"/>

If you just want to set text inside of your last TextView to end then you should use :
android:gravity="end"
for TextView gravity use:
android:layout_gravity="center"
Difference between android:gravity & android:layout_gravity is that first one arrange content inside of any view with given gravity while second one arranges view according to given gravity.
Updated code:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="start"
android:text="title_day"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="start"
android:text="Tuesday"
android:textSize="16sp" />
</LinearLayout>
<TextView
android:id="#+id/tv_fail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="+22"
android:textSize="16sp" />
</LinearLayout>

Achieve Layout Elegantly Without Many Nested Layouts

I am attempting to create this layout in AXML:
However I am unsure of the easiest way to create this and avoid many nested Layout's. I am thinking to have an outer LinearLayout (horiz) with 2 RelativeLayouts for each column (then add the widgets in there).
So like this:
But with this current layout its not positioning correctly:
Can you suggest the easiest way to achieve this layout (ie, not involving many nested layouts) and why my code below isn't displaying correctly?
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minWidth="25px"
android:minHeight="25px"
android:background="#161615">
<!-- Listing Details Section -->
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.5">
<Mvx.MvxImageView
android:id="#+id/listingIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
local:MvxBind="ImageUrl LlistingIcon"
android:layout_alignParentLeft="true" />
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:textSize="15dp"
android:text="First name Last name"
android:layout_toRightOf="#+id/listingIcon" />
<TextView
android:id="#+id/datePosted"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:textSize="15dp"
android:text="2 days ago"
android:layout_toRightOf="#+id/listingIcon" />
</RelativeLayout>
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.5">
<TextView
android:id="#+id/likes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:textSize="15dp"
android:text="13 likes"
android:layout_alignParentLeft="true" />
<TextView
android:id="#+id/comments"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:textSize="15dp"
android:text="4 comments"
android:layout_alignParentLeft="true" />
<Mvx.MvxImageView
android:id="#+id/moreInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
local:MvxBind="ImageUrl MoreInfoIcon"
android:layout_alignParentRight="true" />
</RelativeLayout>
</LinearLayout>
</RelativeLayout>

You should be able to accomplish this with the below layout (using a single RelativeLayout). You may need to adjust padding/margin to your needs to get exactly what you want. I haven't tested it but this should get you close.
<RelativeLayout
...>
<Mvx.MvxImageView
android:id="#+id/listingIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="use appropriate margin for your needs/>
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:textSize="15dp"
android:text="First name Last name"
android:layout_toRightOf="#+id/listingIcon" />
<TextView
android:id="#+id/datePosted"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:textSize="15dp"
android:text="2 days ago"
android:layout_below="#+id/name" /> <!-- see this change -->
<Mvx.MvxImageView
android:id="#+id/moreInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
local:MvxBind="ImageUrl MoreInfoIcon"
android:layout_alignParentRight="true" />
<TextView
android:id="#+id/likes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:textSize="15dp"
android:text="13 likes"
android:layout_alignPToLeftOf="#id/moreInfo" /> <!-- changed -->
<TextView
android:id="#+id/comments"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:textSize="15dp"
android:text="4 comments"
android:layout_toLeftOf="#id/moreInfo"
android:layout_below="#id/likes" />
</RelativeLayout>

You can actually achieve this with a single horizontal LinearLayout and three children.
Your first child would be a TextView with a compound drawable.
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawableLeft="#drawable/some_icon"
/>
The text can be either hardcoded or something you set dynamically, but you can use the power of Android's spans if you need different sections of the text to be styled differently. This way you avoid creating unnecessary TextViews.
Your second child would be another TextView, again with spans if you need to style content differently, and your third child an ImageButton.
This approach will require at most two layout passes to succeed. (One if you don't use weights. It may even still be one pass if you specify weight for only one child and give it a width of 0dp, but I can't quite remember).
A single relative layout could also give you what you want, but requires the definition of confusing constraints and requires two measure/layout passes.

Android how to align headings to listview items

I have a Listview in my application, Which I am trying to put a head for each 'Coloumn' however I cant get them to align correctly.
I have made the heading linearlayout items the same layout params as the listView items but they still dont align.
Here is an example app I made to demonstrate the issue.
I have enabled the developer boarder lines so you can easily see how its not aligned.
Here is the list view display item:
<TextView
android:id="#+id/rhinoZoneDisplayItem_textView_zoneNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:paddingRight="5dp"
android:text="1:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/rhinoZoneDisplayItem_textView_status"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="2"
android:clickable="false"
android:gravity="center"
android:text="Status"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
and the headings linear layout:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginTop="5dp"
android:orientation="horizontal" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="1"
android:gravity="center_horizontal"
android:text="Zone"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="2"
android:gravity="center_horizontal"
android:text="Status"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>

What your doing is correct when your using Layout-Weights make sure you set the width as "0dp" rather than wrap-content. So as to get all Heading and list view items to align correctly and give equal weights for each column.

Use match_parent for TextView width.

You can put in each item of the list the same value for the field
android:layout_marginLeft="50dp"
this is just an example of the value, in this way all the elements are aligned on left side.

Adding ScrollView to RelativeLayout changes position of wigdets

The following is the XML of my layout. It explicitly states that the title, time and description TextViews should be under the image of the alarm. However, as the screen shot shows, the TextViews have moved into the ImageView. Why does this happen and how can I fix this? The problem only started happening when I added the scrollview.
XML
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="#+id/img_alarm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/alarm"
android:layout_centerInParent="true"
android:contentDescription="#string/content_description_layout_alarm"/>
<TextView
android:id="#+id/lbl_alarm_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dip"
android:textStyle="bold"
android:layout_centerHorizontal="true"
android:layout_below="#+id/img_alarm"
android:layout_alignLeft="#+id/img_alarm"
android:text="#string/empty"
/>
<TextView
android:id="#+id/lbl_alarm_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dip"
android:textStyle="bold"
android:layout_centerHorizontal="true"
android:layout_below="#+id/img_alarm"
android:layout_alignRight="#+id/img_alarm"
android:text="#string/empty"
/>
<TextView
android:id="#+id/lbl_alarm_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_below="#+id/lbl_alarm_title"
android:layout_alignLeft="#+id/lbl_alarm_title"
android:layout_alignRight="#+id/lbl_alarm_time"
android:maxLines="1"
android:ellipsize="marquee"
android:text="#string/empty"
/>
<Button
android:id="#+id/btn_stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/lbl_alarm_description"
android:layout_centerHorizontal="true"
android:layout_marginTop="5dip"
android:paddingLeft="20dip"
android:paddingRight="20dip"
android:text="#string/stop_layout_alarm"
android:gravity="center" />
</RelativeLayout>
</ScrollView>
Image

Cute app :)
hmm... not sure why it's doing it, looks like you have the right code, without busting out eclipse. but i've also had some weird bugs with relativelayout that i didn't understand and didn't have time to debug.
i do know of an alternative way you can accomplish what you're looking for -
have a scrollview that encases a linearlayout instead of a relative layout. Do these things:
For the linearlayout, you can set orientation = vertical so that it's still a top down order.
For the part where you need two textviews where one is aligned to the right and the other is aligned to the right, you need another inner linearlayout with its orientation=horizontal. then have one element align parent left, and the other align parent right. add a weightSum=1 attribute to this linearlayout and have each of the two textviews layout_width=0.5 so that each is half the width of the screen
Apply a weightSum=1 attribute to your outer most linearlayout, and see each element inside so that it's layout_weight sum adds up to 1. layout_weight will allow an element to take up that much % of real estate on the screen. like if you set your imageView to have android:layout_weight=0.8 then it'll take up 80% of the screen... since mathematically, (layout_weight/weightSum) = (.08/1) = 80%
try to use that mechanism instead, and if should work :) if it's confusing i can give code
example
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="1">
<ImageView
android:id="#+id/img_alarm"
android:layout_width="match_parent"
android:layout_height="0dip"
android:src="#drawable/alarm"
android:layout_weight="0.7"
android:contentDescription="#string/content_description_layout_alarm"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.1">
<TextView
android:id="#+id/lbl_alarm_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textSize="20dip"
android:textStyle="bold"
android:text="#string/empty"
/>
<TextView
android:id="#+id/lbl_alarm_time"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textSize="20dip"
android:textStyle="bold"
android:text="#string/empty"
/>
</LinearLayout>
<TextView
android:id="#+id/lbl_alarm_description"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0.1"
android:maxLines="1"
android:ellipsize="marquee"
android:text="#string/empty"
/>
<Button
android:id="#+id/btn_stop"
android:layout_weight="0.1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="5dip"
android:paddingLeft="20dip"
android:paddingRight="20dip"
android:text="#string/stop_layout_alarm"
android:gravity="center" />
</LinearLayout>
</ScrollView>
i hope this deserves at least an upvote for the effort :D

Android Listview Row Layout

I'm developing what I thought would be a simple listview row layout, but I'm having some trouble getting my views to line up properly. There are 4 TextViews all using layout_weight within a LinearLayout to size themselves appropriately. What I can't figure out, however, is how to align them consistently so that each TextView begins in the same position as the one above and beneath it.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#AAAAAA88">
<TextView
android:id="#+id/quality"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="2"
android:layout_gravity="center_vertical|right"
android:textColor="#ffffff"
android:padding="5px"
/>
<TextView
android:id="#+id/route_name"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="3"
android:layout_gravity="center_vertical|right"
android:textColor="#ffffff"
android:padding="5px"
/>
<TextView
android:id="#+id/route_grade"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:layout_gravity="center_vertical|right"
android:textColor="#ffffff"
android:padding="5px"
/>
<TextView
android:id="#+id/route_distance"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:layout_gravity="center_vertical|right"
android:textColor="#ffffff"
android:padding="2px"
/>
</LinearLayout>
My attempts to use the :gravity tag don't seem to work. Is LinearLayout the wrong approach here?
As an edit, I'm making some headway using specific width values in dips. Now to test if it looks the same across different screens.

The gravity distributes the remainder of space available after minimum constraints not the total space.
So align different row above and below make sure the remaining space is equal on each row. A good way to accomplish this is to hard-code the minimum space each element needs:
android:layout_weight="2"
android:layout_width="1dip"
Make each TextView on every row 1dip width and split the remaining space according to weight.

you can try using RelativeLayout. Try 4 of the TextViews to be placed relatively, 3 can have fixed width in dp and the 4th can take up rest of the available space. that way each textview will start at a fixed position every time.
something like:
<?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="match_parent" >
<TextView
android:id="#+id/text_1"
android:layout_width="60dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:gravity="left"
android:padding="8dp"
android:text="Text 1"/>
<TextView
android:id="#+id/text_2"
android:layout_width="60dp"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/text_1"
android:layout_toLeftOf="#+id/text_1"
android:gravity="left"
android:padding="8dp"
android:text="Text 2"/>
<TextView
android:id="#+id/text_3"
android:layout_width="60dp"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/text_1"
android:layout_toLeftOf="#+id/text_2"
android:gravity="left"
android:padding="8dp"
android:text="Text 3"/>
<TextView
android:id="#+id/text_4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/text_1"
android:layout_toLeftOf="#+id/text_3"
android:layout_alignParentLeft="true"
android:gravity="left"
android:padding="8dp"
android:text="Text 4"/>
</RelativeLayout>