Develop Reference

How to achieve the following layout on Android

I'm trying to build the following layout on Android without any success.
I want a text to be displayed on my screen. It can take the whole width, but must be centered horizontally.
On the same line, on the right side of the screen I want to display a small layout. It shouldn't impact the horizontal centering of the main text and the main text shouldn't be visible behind the layout displayed on the right.
I cannot use a hard color for my layout background as it's displayed on a transparent background over a bitmap...
Any idea on how to achieve this ?
I can either use a RelativeLayout in which case the main text isn't centered based on the middle of the screen (it takes the right layout width into account)
Or the text is displayed behind the right layout...
Edit:
Here is one of my test
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:orientation="horizontal" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="bottom|center_horizontal"
android:layout_centerInParent="true"
android:fontFamily="sans-serif"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:singleLine="true"
android:textColor="?android:attr/textColorPrimary"
android:textSize="17sp"
android:text="very looooooooooooooooooooooooooooooooong text"
android:textStyle="bold" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_centerInParent="true"
android:layout_alignParentRight="true"
android:padding="3dp"
android:visibility="visible" >
<ImageView
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_gravity="center_vertical"
android:filter="true"
android:src="#drawable/device_access_time" />
<Spinner
android:layout_width="20dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical" />
</LinearLayout>
</RelativeLayout>

RelativeLayouts adhere to the principle of z-indexes, so if you put the right-aligned layout first, the centered text view will be drawn correctly on top.

Texts always in center and right, how?

I am sorry I know it's simple question but I can't make this happen now.
I want one text always will be in center and another in right.
But when texts is too loo long they come to each other.
Let's say I want second text always be in the right and first text is in center but when one of these texts is too long the centered texts have to move left.
How could I do this?
I write this but it doesn't work properly.
<RelativeLayout
android:id="#+id/workout_footer_text"
android:layout_width="match_parent"
android:layout_height="#dimen/workout_header_height"
android:background="#color/green"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingLeft="#dimen/activity_horizontal_margin">
<TextView
android:id="#+id/review_comments_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/text_color_white"
android:textSize="#dimen/review_top_text_size"
android:singleLine="true"
android:gravity="center"
android:layout_toLeftOf="#+id/review_write_label"
android:layout_centerInParent="true"
android:layout_gravity="center"/>
<TextView
android:id="#+id/review_write_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/text_color_white"
android:layout_alignParentRight="true"
android:gravity="center_vertical"
android:singleLine="true"
android:layout_marginLeft="20dp"
android:textSize="#dimen/review_top_text_size"
android:layout_centerVertical="true"/>
</RelativeLayout>

Instead of layout_toLeftOf="#+id/review_write_label" in your first TextView, remove that line and add layout_toRightOf="#id/review_comments_label" to your second TextView to make sure the first view stays centered and the second view stays to the right.
Update
Then make the second view's width match parent and set it's gravity to right. This will right justify the text in a container that stretches from the right edge of the centered TextView to the right edge of the parent thanks to the match_parent width.

You can try this:
<LinearLayout
android:id="#+id/linearLayout2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:orientation="horizontal">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="text1" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="text2" />
</LinearLayout>

RelativeLayout Three Buttons Centered Above TextViews

So in my layout, I've got three buttons on the same line, one left, center and right aligned. I also have TextViews below the buttons to serve as labels, but they too are aligned left, center and right respectively. I'd like them to instead be centered below the buttons and on the same line as one another, but I can't figure out how to do this without explicitly setting coordinates, which will then break on some phones. I tried setting various weights and layout options, but it just doesn't work how I'd like. Is there a way to do this in a RelativeLayout? Or maybe it's just not possible. Finally, I've got more three TextViews on the same line and one button on the bottom. I would like to align as shown bellow:
http://imgur.com/vYuqk
Thanks in advance.

You can't center one element below another with RelativeLayout. You could try a horizontal LinearLayout with three RelativeLayouts (one for each column). You could contain the whole thing in a vertical LinearLayout to get the bottom button.
TableLayout or GridLayout are possibilities as well.

As people suggested, there is no way to center a View below another View in RelativeLayout. You could maybe use this hack if you can confirm that the TextView width need not be more the Button width. The solution is: you make the TextView align its left and right edge to the Button above. Then set the gravity of the TextView to center so that the text inside TextView is centered.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="130dp"
android:text="Button1" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button1"
android:layout_alignBottom="#+id/button1"
android:layout_centerHorizontal="true"
android:text="Button2" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button2"
android:layout_alignBottom="#+id/button2"
android:layout_alignParentRight="true"
android:text="Button3" />
<TextView
android:id="#+id/textView1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/button1"
android:layout_alignRight="#id/button1"
android:layout_below="#+id/button1"
android:layout_marginTop="50dp"
android:gravity="center"
android:text="Txt1" />
<TextView
android:id="#+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/button2"
android:layout_alignRight="#id/button2"
android:layout_below="#+id/button2"
android:layout_marginTop="50dp"
android:gravity="center"
android:text="Txt2" />
<TextView
android:id="#+id/textView3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/button3"
android:layout_alignRight="#id/button3"
android:layout_below="#+id/button3"
android:layout_marginTop="50dp"
android:gravity="center"
android:text="Txt3" />
</RelativeLayout>

Why are my "centered" objects slightly off-center in my RelativeLayout?

I wanted to make two equally-sized radio buttons with a custom background, text, and an image to the right of the text. Because of how different these are from a standard "Button", I made them using a clickable "RelativeLayout".
The text and the image are of different heights, but I want each one to be centered vertically in the button. I also want the combination of the text+image to be centered horizontally in the button. This second part is what I'm having trouble with; it's off-center, close to the left side. In the image below, the left side is what I want, but the right side is what's happening. The image on one of the buttons (the one with the longer text) is resized to be smaller, too... Though there is still plenty of space on the right side of the button.
Here is my code:
<LinearLayout
android:baselineAligned="false"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RelativeLayout
android:id="#+id/my_button"
android:background="#drawable/radio_button"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<TextView
android:id="#+id/button_textview"
android:text="#string/button_label"
android:textAppearance="?android:attr/textAppearanceButton"
android:layout_centerVertical="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></TextView>
<ImageView
android:contentDescription="#string/image_description"
android:id="#+id/button_imageview"
android:layout_centerVertical="true"
android:src="#drawable/my_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/button_textview">
</ImageView>
</RelativeLayout>
<RelativeLayout
... same thing for the second button ...
</RelativeLayout>
</LinearLayout>
What am I doing wrong?

Use this as your button:
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center_horizontal"
>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="MyButton"/>
<ImageView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:src="#drawable/my_image"/>
</LinearLayout>
Now, you can place it in other parent views. To apply layout attributes to above button, place those attributes in the outer <LinearLayout> tag of above button.
Alternative:
You can set custom images to be drawn on sides(Left,Right,Top,Bottom) of a TextView using attributes like:
android:drawableLeft="#drawable/my_image"

Turns out the solution was adding
android:paddingRight="0dip"
strangely enough, even though I didn't put any padding there in the first place.

Center multiple items in a RelativeLayout without putting them in a container?

I have a RelativeLayout containing a pair of side-by-side buttons, which I want to be centered within the layout. I could just put the buttons in a LinearLayout and center that in the RelativeLayout, but I want to keep my xml as clean as possible.
Here's what I tried, this just puts the "apply" button in the center and the "undo" button to the left of it:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15sp">
<TextView
android:id="#+id/instructions"
android:text="#string/instructions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="15sp"
android:layout_centerHorizontal="true"
/>
<Button
android:id="#+id/apply"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="#string/apply"
android:textSize="20sp"
android:layout_below="#id/instructions"
/>
<Button
android:id="#+id/undo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="#string/undo"
android:textSize="20sp"
android:layout_toLeftOf="#id/apply"
android:layout_below="#id/instructions"
/>
</RelativeLayout>

android:gravity will align the content inside the view or layout it is used on.
android:layout_gravity will align the view or layout inside of his parent.
So adding
android:gravity="center"
to your RelativeLayout should do the trick...
Like this:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_marginTop="15sp">
</RelativeLayout>

Here is an extension of BrainCrash's answer. It is a non nested option that groups and centers all three horizontally and vertically. In addition, it takes the top TextView and centers it horizontally across both buttons. If desired, you can then center the text within the TextView with android:gravity="center". I also removed the margins, added color, and set the RelativeLayout height to fill_parent to highlight the layout. Tested on API 11.
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:background="#android:color/black"
>
<TextView
android:id="#+id/instructions"
android:text="TEST"
android:textSize="20sp"
android:background="#android:color/darker_gray"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignLeft="#+id/undo"
android:layout_alignRight="#+id/apply"
android:gravity="center"
/>
<Button
android:id="#+id/apply"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="APPLY"
android:textSize="20sp"
android:layout_below="#id/instructions"
/>
<Button
android:id="#+id/undo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="UNDO"
android:textSize="20sp"
android:layout_toLeftOf="#id/apply"
android:layout_below="#id/instructions"
/>
</RelativeLayout>

android:layout_gravity="center"
will almost give what you're looking for.

Here is a combination of the above answer's that solved my specific situation:
Centering two separate labels within a layout that also includes a button in the left most position of the same layout (button, label, label, from left to right, where the labels are centered relative to the layout containing all three views - that is, the button doesn't push the labels off center).
I solved this by nesting two RelativeLayout's, where the outer most layout included the
Button and an Inner-RelativeLayout.
The Inner-RelativeLayout contained the two text labels (TextView's).
Here is a snippet that provides the details of how the centering and other layout stuff was done:
see: RelativeLayout Gravity not applied? and
Gravity and layout_gravity on Android
for the difference's between gravity and layout_gravity.
Tweak the paddingLeft on the btn_button1 Button to see that the TextView's do not move.
(My apologies to havexz for the downvotes. I was too hasty in thinking that just b/c your suggestions didn't solve the exact question being ask, that they do help to solve very similar situations (the answer here solves a very specific situation, and only the combination of all these answer's solved my problem. I tried upvoting, but it won't let me unless I edit the answer's, which I don't want to do.)
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/rl_outer"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:background="#FF0000FF">
<Button
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/btn_button1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#FF00FF00"
android:text="<"
android:textSize="20sp"
android:paddingLeft="40dip"/>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/rl_inner"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#FFFF00FF"
android:layout_centerInParent="true"
android:gravity="center">
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/tv_text1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#FF505050"
android:textSize="20sp"
android:textColor="#FFFFFFFF"
android:text="Complaint #"
android:gravity="center"/>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/tv_text2"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#FF505050"
android:textSize="20sp"
android:textColor="#FFFFFFFF"
android:layout_toRightOf="#id/tv_text1"
android:gravity="center"/>
</RelativeLayout>
</RelativeLayout>

LinearLayout is a good option. Other than that there are options like create an invisible view and center that and then align left button to the left it and right on the right of it. BUT those are just work arounds.