Develop Reference

LinearLayout inside CardView not filling the whole space

Why is my Linear Layout not taking up the whole space inside the CardView?
When I use the preview and expand the LinearLayout to match the CardViews width it sets the width to match_parent (which I tried manually) but then goes back to how it is now.
In other words: I want the red background to go all the way to the right and also the right TextView aligned to the right.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
android:id="#+id/itemCardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="3dp"
android:layout_marginBottom="3dp"
android:layout_marginTop="3dp"
android:background="#color/Mat"
android:padding="3dp"
app:cardElevation="4dp"
app:cardCornerRadius="1dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:animateLayoutChanges="true"
android:background="#color/Mat"
android:orientation="horizontal"
android:padding="3dp"
android:paddingLeft="5dp"
android:paddingRight="5dp">
<TextView
android:id="#+id/textView2"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="#drawable/circle"
android:gravity="center"
android:text="DEU"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="Frau Hardt"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="#+id/textView4" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="O03"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
Edit: After removing the min-width and setting the width of the whole layout to match_parent it goes all the way to the right.
Now how do I get to center the TextView with the name horizontally and have the text view on the right align to the right of the whole layout?
I included a picture because it looks all nice right next to each other. I hope the code (especially since it's not a whole lot) doesn't have to be as text. If so I'll edit the question of course!
Thanks!

Make your middle TextView as this;
<TextView
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
... />
It fills the remaining middle space.
You also should use match_parent instead of fill_parent since it is deprecated.

Why does image in relative layout with "fill_parent" hide button underneath?

I'm trying to increase the size of an image in relative layout. Right now, its width and height are set to wrap_content. When I set them fill_parent, the image grows, but pushes the button underneath off the display. The relevant XML is below. What am I doing wrong?
Edit: Thanks for all the answers, but so far, if I set the height of the image to fill_parent or match_parent, it always extends to the bottom of the display, regardless of if the button is in or outside of relative layout. Why does the relative layout ignore what's beneath it?
<LinearLayout>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativelayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/myImageView"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/apple"
android:alpha=".5"
android:paddingBottom="0dp"
android:adjustViewBounds="true" />
<TextView
android:id="#+id/myImageViewText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Sample"
android:textColor="#000000"
android:singleLine="true"
android:layout_alignLeft="#+id/myImageView"
android:layout_alignStart="#+id/myImageView"
android:layout_alignParentTop="true" />
</RelativeLayout>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/enterPluButton"
android:background="#FFBD5C"
android:textColor="#000000"
android:text="Submit" />
</LinearLayout>

Set android:layout_alignParentBottom="true" for button.
Set android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/enterPluButton" for your RelativeLayout
Set android:layout_width="match_parent"
android:layout_height="match_parent" for the ImageView

In RelativeLayouts views are positioneed relatively to the top left of the "ViewGroup". To get the ImageView to stop hiding the Button, or any other view at that matter, add the layout_below attribute.
<TextView
android:layout_below="#+id/relativelayout"
android:id="#+id/myImageViewText"
android:layout_width="fill_parent"
...
/>
Also, for ImageView it is not advised, unless being used for a background, that you set layout_height to fill_parent or match_parent.
You would get the desired result if you place the Button in the relative layout and position it under the text view.

RelativeLayout positions View relative of each other. if it does not have a relation to a another child View it calculates with the Parent View which is the RelativeLayout. This is why you are having that. Why don't wrap the LinearLayout in a ScrollView or give the RelativeLayout a fixed dimension

I understand now what you're trying to do. Try this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativelayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/myImageView"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:adjustViewBounds="true"
android:alpha=".5"
android:paddingBottom="0dp"
android:src="#drawable/apple" />
<TextView
android:id="#+id/myImageViewText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/myImageView"
android:layout_alignParentTop="true"
android:layout_alignStart="#+id/myImageView"
android:gravity="center"
android:singleLine="true"
android:text="Sample"
android:textColor="#000000" />
<Button
android:id="#+id/enterPluButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="#id/myImageView"
android:background="#FFBD5C"
android:text="Submit"
android:textColor="#000000" />
</RelativeLayout>

Android: TextView and Button on Same Line in ExpandableListView

So I have an ExpandableListView and basically I have some text (person's name), and then I want a button on the same row (towards the right side if possible). Currently, this code in my XML file it has the text on one line, and then the button on the next line, I've played around with it but can't figure out how to get it both on one line.
LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="55dip"
android:orientation="horizontal"
android:weightSum="1" >
<TextView
android:id="#+id/lblListItem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="17dp"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_weight="0.8"
android:textSize="11dp"
android:text="Checkout"
android:id="#+id/checkout" />
</LinearLayout>

This will do the trick.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="55dip"
android:orientation="horizontal" // Edited here
android:weightSum="1" > // here
<TextView
android:id="#+id/lblListItem"
android:layout_width="match_parent" //and here
android:layout_height="35dp"
android:focusable="false"
android:focusableInTouchMode="false"
android:gravity="center_vertical"
android:layout_weight="0.2" // here
android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent" // and here
android:layout_height="wrap_content"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_weight="0.8" // and here
android:textSize="12dp"
android:text="Checkout"
android:id="#+id/checkout" />
</LinearLayout>
Make sure of 2 things when using weightsum:
if orientation is horizontal, width of all child views to be displayed in a row will need to have "match_parent" and some value for layout_weight.
0.2 will give 80% of horizontal width of parent and 0.8 will give 20%.

You have
android:orientation="vertical"
in your parent LinearLayout which stacks elements from top to bottom (naturally). Remove that line (since horizontal is the default orientation for LinearLayout). Then you would need to use weight or margin to get it positioned where you want.
Another option would be to replace your LinearLayout with a RelativeLayout. This will allow you to use android:alignParentRight="true" on your Button to put it on the right side of the screen (RelativeLayout puts Views at the top-left by default).

Unable to horizontally center a TextView

I have a TextView inside a LinearLayout and i want to align it in center of the page but its not happening, i have tried the following:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<TextView
android:id="#+id/userName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:background="#80000000"
android:gravity="center"
android:padding="10dp"
android:text="User Name"
android:textColor="#FFFFFF"
android:textSize="12sp" />
</LinearLayout>

Change the TextView layout_width to "match_parent", the issue is that "gravity" works only for the child of the View in this case the "text" it self, hence if you specify the object width as just to wrap its content, it means there's no space to center to, filling the whole parent and using "gravity" center would do the trick.
The other thing you can do is changing the "android:gravity" property to "android:layout_gravity" and center horizontal, this way you are telling the TextView itself to move to the center...
As best practice always try to use RelativeLayouts and avoid LinearLayouts, they provide a better way to manipulate Views position and are "device size fragmentation" friendly, RelativeLayout have plenty of methods to position views on the most common positions including center, top, bottom etc...
Hope this Helps.
Regards!

Try changing the layout. Linear Layout is meant for displaying ui components in rows. If you want to center your textview using you layout, I suggest changing the layout to Relative Layout.

First of all you cant set the property android:layout_centerHorizontal="true" for a LinearLayout. To make it centered you need to make layout height and width to match_parent like below,
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="#+id/userName"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:background="#80000000"
android:gravity="center"
android:padding="10dp"
android:text="User Name"
android:textColor="#FFFFFF"
android:textSize="12sp" />
</LinearLayout>

Try using:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:gravity="center" >
<TextView
android:id="#+id/userName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="#80000000"
android:gravity="center"
android:padding="10dp"
android:text="User Name"
android:textColor="#FFFFFF"
android:textSize="12sp" />
</LinearLayout>

Android RelativeLayout and equal alignment

I have a table row setup using relative layout. It has 2 TextView both of which I want to have equal spacing and left aligned text. See current setup below. This has one textview aligned left and another right. When I change to align both to left content overlaps.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout02"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dip">
<TextView
android:id="#+id/displayLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_toRightOf="#+id/row_image"
android:text="adasd"
android:textSize="18sp" />
<TextView
android:id="#+id/displayValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="20dp"
android:text="adasd"
android:textSize="18sp"/>
</RelativeLayout>
Any suggestions. Thanks in advance for the help.

It seems like a job for weighted LinearLayout - display two equaly-sized text views:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout02"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dip">
<TextView
android:id="#+id/displayLabel"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:text="adasd"
android:textSize="18sp"
android:layout_weight="1"/>
<TextView
android:id="#+id/displayValue"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="20dp"
android:text="adasd"
android:textSize="18sp"
android:layout_weight="1"/>
</LinearLayout>
Then in emulator it will looks like:
Note the layout_weight attribute in both text views and zero layout_width. Basically it means that the views will get additional amount of free space proportional to specified weight. So for equivalent weights these views will be of identical width.
See layout guide on developer.android.com for further reference.

Did you tried using following for displayValue TextView instead of alignParentRight?
android:layout_toRightOf="#id/displayLabel"
Then give some left margin.