I have this linear layout vertical orientation, containing three views,
I want first view to be on top , second to be in the centre and third to be at the bottom of the parent linear layout, I am applying layout_gravity on the children of the layout but this property seems not working at all..
All of them show at the top of the screen one after the other
Edit : This might get solved if weight is applied to the second view , but what's going on with layout_gravity, why is it not serving the purpose ?
here is the code
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:text="Wifi not enabled"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="App require wifi to be enabled on your phone"
android:textAppearance="?android:attr/textAppearanceSmall" />
<Button
android:id="#+id/btn_wifion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="Turn on my Wifi" />
</LinearLayout>
Try reading the [UPDATE] part here. It says -
“layout_gravity” property can only be used orthogonally with the orientation of the LinearLayout.
In other words, if you have a horizontal LinearLayout, then by construction, each inside child view can only have layout_gravity top, bottom, and center. The intuition behind this is that the LinearLayout is already told to place each child view horizontally adjacent to each other (left to right), and so it only allows vertical specification for the layout_gravity of each child. Vice versa for a vertical LinearLayout.
The same goes with vertical n layout_gravity now does not allow you to align the child views to the parent's top/bottom/... for that there is RelativeLayout.
Maybe this is what you were looking for. :)
UPDATE And refer to this link for more. :)
you better use RelativeLayout: and why layout_gravity is not working within linear-layout, have a once look Class Overview of linear layout.
To achieve your desire goal use Relative Layout and use android:layout_alignParent check below code#
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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:layout_centerHorizontal="true"
android:text="Wifi not enabled"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="App require wifi to be enabled on your phone"
android:textAppearance="?android:attr/textAppearanceSmall" />
<Button
android:id="#+id/btn_wifion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Turn on my Wifi" />
</RelativeLayout>
Is this what you need?
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_weight="0"
android:text="Wifi not enabled"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:layout_weight="1"
android:text="App require wifi to be enabled on your phone"
android:textAppearance="?android:attr/textAppearanceSmall" />
<Button
android:id="#+id/btn_wifion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="0"
android:text="Turn on my Wifi" />
</LinearLayout>
Related
I already understand that if I use layout_gravity="center_horizontal" on the text view, then the text will be center. But I don't want to use that because I want to have as little code as possible and the best way to do that is by applying gravity="center_horizontal" to my relative layout. I am also asking this question because I am concerned about even using gravity or layout_gravity with relative layouts at all. As when doing my research I came upon this answer.
Notice the part that says:
Don't use gravity/layout_gravity with a RelativeLayout. Use them for Views in LinearLayouts and FrameLayouts.
Even though it seems pretty apparent to me from the relative layout Android Documentation, which clearly lists gravity as a valid attribute, that Google intended these attributes to be used with relative layouts.
If that quote is correct, how do I center views in relative layouts?
Also, here is my code:
Notice the title is not centered horizontally
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:gravity="center_horizontal"
tools:context="com.something">
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/TextAppearance.AppCompat.Title"
android:textAlignment="center"
android:text="#string/app_title"
android:layout_marginBottom="#dimen/main_spacing"
android:textSize="24sp" />
<AutoCompleteTextView
android:id="#+id/enterContact"
android:text="Enter Contact"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAlignment="center"
android:layout_below="#+id/title"
android:layout_marginBottom="#dimen/main_spacing" />
</RelativeLayout>
This is a supplemental answer to Gravity and layout_gravity on Android.
View gravity and layout_gravity inside a Relative Layout
My original statement that gravity and layout_gravity should not be used in the subviews of a RelativeLayout was partly wrong. The gravity actually works fine. However, layout_gravity has no effect. This can be seen in the example below. The light green and light blue are TextViews. The other two background colors are RelativeLayouts.
As you can see, gravity works, but layout_gravity doesn't work.
Relative Layout with gravity
My original answer about gravity and layout_gravity dealt with these attributes being applied to the Views within a ViewGroup (specifically a LinearLayout), not to the ViewGroup itself. However, it is possible to set gravity and layout_gravity on a RelativeLayout. The layout_gravity would affect how the RelativeLayout is positioned within its own parent, so I will not deal with that here. How gravity affects the subviews, though, is shown in the image below.
I resized the widths of all the subviews so that what is happening is more clear. Note that the way RelativeLayout handles gravity is to take all the subviews as a group and move them around the layout. This means that whichever view is widest will determine how everything else is positioned. So gravity in a Relative layout is probably only useful if all the subviews have the same width.
Linear Layout with gravity
When you add gravity to a LinearLayout, it does arrange the subviews as one would expect. For example, one could "save code" by setting the gravity of LinearLayout to center_horizontally. That way there is no need individually set the layout_gravity of each subview. See the various options in the image below.
Note that when a view uses layout_gravity, it overrides the LinearLayout's gravity. (This can be seen in the title for the two layouts in the left image. The LinearLayout gravity was set to left and right, but the title TextView's layout_gravity was set to center_horizontally.)
Final notes
When positioning views within a RelativeLayout, the general way to do it is adding things like the following to each view:
layout_alignParentTop
layout_centerVertical
layout_below
layout_toRightOf
If one wants to set all the views at once, a LinearLayout would likely be better (or perhaps using a Style).
So to sum up,
The layout_gravity does not work for subviews in a RelativeLayout.
The gravity of a RelativeLayout does work, but not as one might expect.
Supplemental XML
XML for image "View gravity and layout_gravity inside a Relative Layout":
<?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:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#e3e2ad" >
<TextView
android:id="#+id/tvTop1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:textSize="24sp"
android:text="Views' gravity=" />
<!-- examples of gravity -->
<TextView
android:id="#+id/tvTop2"
android:layout_below="#id/tvTop1"
android:layout_width="200dp"
android:layout_height="40dp"
android:background="#bcf5b1"
android:gravity="left"
android:text="left" />
<TextView
android:id="#+id/tvTop3"
android:layout_below="#id/tvTop2"
android:layout_width="200dp"
android:layout_height="40dp"
android:background="#aacaff"
android:gravity="center_horizontal"
android:text="center_horizontal" />
<TextView
android:id="#+id/tvTop4"
android:layout_below="#id/tvTop3"
android:layout_width="200dp"
android:layout_height="40dp"
android:background="#bcf5b1"
android:gravity="right"
android:text="right" />
<TextView
android:id="#+id/tvTop5"
android:layout_below="#id/tvTop4"
android:layout_width="200dp"
android:layout_height="40dp"
android:background="#aacaff"
android:gravity="center"
android:text="center" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#d6c6cd" >
<TextView
android:id="#+id/tvBottom1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:textSize="24sp"
android:text="Views' layout_gravity=" />
<!-- examples of layout_gravity -->
<TextView
android:id="#+id/tvBottom2"
android:layout_below="#id/tvBottom1"
android:layout_width="200dp"
android:layout_height="40dp"
android:layout_gravity="left"
android:background="#bcf5b1"
android:text="left" />
<TextView
android:id="#+id/tvBottom3"
android:layout_below="#id/tvBottom2"
android:layout_width="200dp"
android:layout_height="40dp"
android:layout_gravity="center_horizontal"
android:background="#aacaff"
android:text="center_horizontal" />
<TextView
android:id="#+id/tvBottom4"
android:layout_below="#id/tvBottom3"
android:layout_width="200dp"
android:layout_height="40dp"
android:layout_gravity="right"
android:background="#bcf5b1"
android:text="right" />
<TextView
android:id="#+id/tvBottom5"
android:layout_below="#id/tvBottom4"
android:layout_width="200dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:background="#aacaff"
android:text="center" />
</RelativeLayout>
</LinearLayout>
XML for image "Relative Layout with gravity":
<?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:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center_horizontal"
android:background="#e3e2ad" >
<TextView
android:id="#+id/tvTop1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="24sp"
android:text="Views' gravity=" />
<!-- examples of gravity -->
<TextView
android:id="#+id/tvTop2"
android:layout_below="#id/tvTop1"
android:layout_width="200dp"
android:layout_height="40dp"
android:background="#bcf5b1"
android:gravity="left"
android:text="left" />
<TextView
android:id="#+id/tvTop3"
android:layout_below="#id/tvTop2"
android:layout_width="300dp"
android:layout_height="40dp"
android:background="#aacaff"
android:gravity="center_horizontal"
android:text="center_horizontal" />
<TextView
android:id="#+id/tvTop4"
android:layout_below="#id/tvTop3"
android:layout_width="100dp"
android:layout_height="40dp"
android:background="#bcf5b1"
android:gravity="right"
android:text="right" />
<TextView
android:id="#+id/tvTop5"
android:layout_below="#id/tvTop4"
android:layout_width="150dp"
android:layout_height="40dp"
android:background="#aacaff"
android:gravity="center"
android:text="center" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:background="#d6c6cd" >
<TextView
android:id="#+id/tvBottom1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="24sp"
android:text="Views' gravity=" />
<!-- examples of layout_gravity -->
<TextView
android:id="#+id/tvBottom2"
android:layout_below="#id/tvBottom1"
android:layout_width="200dp"
android:layout_height="40dp"
android:gravity="left"
android:background="#bcf5b1"
android:text="left" />
<TextView
android:id="#+id/tvBottom3"
android:layout_below="#id/tvBottom2"
android:layout_width="300dp"
android:layout_height="40dp"
android:gravity="center_horizontal"
android:background="#aacaff"
android:text="center_horizontal" />
<TextView
android:id="#+id/tvBottom4"
android:layout_below="#id/tvBottom3"
android:layout_width="100dp"
android:layout_height="40dp"
android:gravity="right"
android:background="#bcf5b1"
android:text="right" />
<TextView
android:id="#+id/tvBottom5"
android:layout_below="#id/tvBottom4"
android:layout_width="150dp"
android:layout_height="40dp"
android:gravity="center"
android:background="#aacaff"
android:text="center" />
</RelativeLayout>
</LinearLayout>
XML for image "Linear Layout with gravity":
<?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:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center_horizontal"
android:background="#e3e2ad"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:textSize="24sp"
android:text="View's gravity=" />
<TextView
android:layout_width="200dp"
android:layout_height="40dp"
android:background="#bcf5b1"
android:gravity="left"
android:text="left" />
<TextView
android:layout_width="300dp"
android:layout_height="40dp"
android:background="#aacaff"
android:gravity="center_horizontal"
android:text="center_horizontal" />
<TextView
android:layout_width="100dp"
android:layout_height="40dp"
android:background="#bcf5b1"
android:gravity="right"
android:text="right" />
<TextView
android:layout_width="150dp"
android:layout_height="40dp"
android:background="#aacaff"
android:gravity="center"
android:text="center" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:background="#d6c6cd"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:textSize="24sp"
android:text="View's gravity=" />
<TextView
android:layout_width="200dp"
android:layout_height="40dp"
android:background="#bcf5b1"
android:gravity="left"
android:text="left" />
<TextView
android:layout_width="300dp"
android:layout_height="40dp"
android:background="#aacaff"
android:gravity="center_horizontal"
android:text="center_horizontal" />
<TextView
android:layout_width="100dp"
android:layout_height="40dp"
android:background="#bcf5b1"
android:gravity="right"
android:text="right" />
<TextView
android:layout_width="150dp"
android:layout_height="40dp"
android:background="#aacaff"
android:gravity="center"
android:text="center" />
</LinearLayout>
</LinearLayout>
Testing your layout, for me it's working (the TextView is centered correctly).
However, you could also remove android:gravity="center_horizontal" from the RelativeLayout and add android:layout_centerHorizontal="true" in the TextView.
I've always had problems with RelativeLayouts and TextViews too. I think that this is due to the fact that TextView calculates its size dynamically and this prevents it to work well with layout's gravity. That's just one my supposition.
The solution I generally adopt is to configure a textview horizontal size with match_parent. It might be a suboptimal solution, but should work. In case you need a Fixed size textView you can put a fixed size dimension and should work too, it gives problems only with wrap_content.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:gravity="center_horizontal"
tools:context="com.something">
<TextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="#style/TextAppearance.AppCompat.Title"
android:textAlignment="center"
android:text="#string/app_title"
android:layout_marginBottom="#dimen/main_spacing"
android:textSize="24sp" />
</RelativeLayout>
Edit:
as suggested by #Valentino S., adding
android:layout_centerHorizontal="true"
with wrap_content should work too. The reason is in my head still the same: size of textView is calculated later.
As the documentation says:
android:gravity
Specifies how an object should position its content, on both the X and
Y axes, within its own bounds.
...
center_horizontal
Place object in the horizontal center of its container, not changing
its size.
So the android:gravity="center_horizontal" will center horizontal-ing the RelativeLayout to its parent. Not making its content center horizontal.
Remember that android:layout_gravity is used for the view itself relative to the parent or layout.
Please be aware that the behaviour of Layout can differ slightly for each API Level. And be noted, that we can't 100% sure that the visual result in Layout Editor is correct. Always test your layout in real devices.
try this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#000000"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin">
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginBottom="10dp"
android:background="#ffffffff"
android:text="TITLE"
android:textAlignment="center"
android:textAppearance="#style/TextAppearance.AppCompat.Title"
android:textSize="24sp" />
<AutoCompleteTextView
android:id="#+id/enterContact"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/title"
android:layout_marginBottom="10dp"
android:background="#ffffffff"
android:text="Enter Contact"
android:textAlignment="center" />
</RelativeLayout>
TlDr: android:gravity Works with RelativeLayout , you can skip to the bottom if you don't want to read the explanation
EDIT this is a giant wall of text, please bear with me
This is what I imagine you want to achieve:
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/TextAppearance.AppCompat.Title"
android:textAlignment="center"
android:text="#string/app_title"
android:layout_marginBottom="#dimen/main_spacing"
android:textSize="24sp"
android:layout_centerHorizontal="true"/> <!-- LAYOUT PARAMS WORK!!!-->
Why does this work, while android:gravity (apparently) doesn't?
if your goal is to put the TextView in the horizontal center of the Layout/Screen you have to let the RelativeLayout know!
this is achieved through something called LayoutParams - these are data structures defined by each View which are used by the View's parent (in this case the RelativeLayout)
so let's say your TextView has the following LayoutParams :
android:layout_centerHorizontal="true"
you will get something like this:
When the RelativeLayout is distributing its child views around the screen, along the way there is a callback method being run - onLayout(...) - which is part of a more complex method sequence that will determine the position of each child View inside the RelativeLayout, this is achieved in part by accessing the LayoutParams in each child View, in this case that line in your TextView
This is why we say LayoutParams are passed on to the parent like in the link you mentioned before
WARNING: Endless Confusion Source!
View positioning inside Layouts / ViewGroups is done through LayoutParams the onLayout calls
It so happens that some layouts like FrameLayout have a LayoutParam called android:layout_gravity which causes great confusion with the android:gravity property that each view can define, which is NOT the same and not even a LayoutParam
android:gravity is used by any View (like a TextView for example) to place its content inside.
Example: let's say that you change your TextView to be very high, and you want the text at the bottom of the TextView, instead of at the top
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="95dp" <------------ very high!
android:textAppearance="#style/TextAppearance.AppCompat.Title"
android:textAlignment="center"
android:text="#string/app_title"
android:layout_marginBottom="#dimen/main_spacing"
android:textSize="24sp"
android:layout_centerHorizontal="true" <----- LayoutParams for RelativeLayout
/>
TextView is CENTERED in the RelativeLayout but text is at the TOP of the "box"
Let's use android:gravity to manage the text position INSIDE THE TextView
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="95dp"
android:textAppearance="#style/TextAppearance.AppCompat.Title"
android:textAlignment="center"
android:text="#string/app_title"
android:layout_marginBottom="#dimen/main_spacing"
android:textSize="24sp"
android:layout_centerHorizontal="true"
android:gravity="bottom" <---**NOT LayoutParams**, NOT passed to RLayout
/>
Result: As expected only the inside of the View changed
TLDR
Now if you want to ignore everything above and still use android:gravity with RelativeLayout, RelativeLayout is also a Viewso it has the android:gravity property, but you have to remove other properties or LayoutParams which will override the behaviour defined by the android:gravity property look at android:gravity at work with RelativeLayout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:gravity="bottom"> <!-- NOT LAYOUT PARAMS -->
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="95dp"
android:textAppearance="#style/TextAppearance.AppCompat.Title"
android:textAlignment="center"
android:text="#string/app_title"
android:layout_marginBottom="#dimen/main_spacing"
android:textSize="24sp"
android:layout_centerHorizontal="true"
/>
<AutoCompleteTextView
android:id="#+id/enterContact"
android:text="Enter Contact"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAlignment="center"
android:layout_below="#+id/title"
android:layout_marginBottom="#dimen/main_spacing" />
</RelativeLayout>
I have a Horizontal Layout and I have some views inside it. I want some to start from the left and others to start in the right, but I can't manage to do it. I tried several Gravity configurations but they don't do anything.
That's the case I have:
I want the Flag to be in the right and the Time to be in the left, as pointed by the arrows. I will add some more flags later.
Could anyone help me out with this? Thanks :D
EDIT:
XML so far:
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:id="#+id/hlTopBar"
android:background="#e6262626"
android:gravity="center_vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/default_time_date_string"
android:id="#+id/tvTime"
android:textStyle="bold"
android:paddingLeft="10dp"
android:gravity="left" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/ibUSA"
android:src="#drawable/united_states_flag"
android:background="#android:color/transparent"
android:adjustViewBounds="true" />
</LinearLayout>
android:layout_gravity works in the direction opposite the orientation of the LinearLayout – the children of a vertical LinearLayout can use android:layout_gravity to control their positioning horizontally (left or right), but not vertically. In the same way children of horizontal LinearLayout can use android:layout_gravity to control their positioning vertically (top or bottom) but not horizontally. As you are using Horizontal LinearLayout you can use android:layout_gravity to position children either top or bottom.For your purpose it is better to go with RelativeLayout.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
.........
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
/>
<ImageView
.......
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
/>
</RelativeLayout>
Instead of using a horizontal layout use a Relative layout
example:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Time" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Image" />
</RelativeLayout>
result:
The RelativeLayout is a good answer. If, however, you REALLY want to do it with a LinearLayout, try putting an empty TextView in the middle, with width=0 and weight=1.
This empty view will automatically try to fill up however much space isn't taken up by the other views.
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="30dp"
android:id="#+id/hlTopBar"
android:background="#e6262626"
android:gravity="center_vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/default_time_date_string"
android:id="#+id/tvTime"
android:textStyle="bold"
android:paddingLeft="10dp" />
<TextView
android:id="#+id/spacer"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/ibUSA"
android:src="#drawable/united_states_flag"
android:background="#android:color/transparent"
android:adjustViewBounds="true" />
</LinearLayout>
i am desinging a xml
<?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:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.05"
android:background="#000000"
android:orientation="horizontal" >
<Button
android:id="#+id/btncancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|center"
android:background="#CCCCCC"
android:text="Cancel" />
<Button
android:id="#+id/btnadd"
android:layout_width="82dp"
android:layout_height="wrap_content"
android:gravity="right"
android:background="#3399FF"
android:text="Add" />
</LinearLayout>
</LinearLayout>
for button "Add" android:gravity=right is not working.i have give a layout:margin,then only its moving right.can anyone help me out.
It's a little unclear what you want, but do notice the following:
gravity affects the contents of the widget i.e. your button text.
layout_gravity affects positioning of the widget in the parent layout
So if you want the button to be on right, change gravity to layout_gravity.
Use RelativeLayout instead of LinearLayout.
and use android:layout_alignParentRight="true" for btnadd.
EDIT :
Code :
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.05"
android:background="#000000"
android:orientation="horizontal" >
<Button
android:id="#+id/btncancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|center"
android:background="#CCCCCC"
android:text="Cancel" />
<Button
android:id="#+id/btnadd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_gravity="right"
android:background="#3399FF"
android:text="Add" />
</RelativeLayout>
Change the LinearLayout to be as RelativeLayout
and instead of android:gravity="right" use android:layout_alignParentRight="true"
It is because you use LinearLayout (orientation horizontal)
Try to use relative layout
you are using linear layout in linear layout your layout depends on orientation like you are using vertical:
use relative layout instead to solve your problem,and give margins you want
also to align your button right use:
android:layout_alignParentRight="true"
your problem would definetly be solved with this.
it was because of you are using android:orientation="horizontal"in Linear Layout
use this android:orientation="vertical"
or use this i modified your code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<RelativeLayout
android:id="#+id/RelativeLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.05"
android:background="#000000"
android:orientation="horizontal" >
<Button
android:id="#+id/btncancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="#CCCCCC"
android:text="Cancel" />
<Button
android:id="#+id/btnadd"
android:layout_width="82dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="#3399FF"
android:text="Add" />
</RelativeLayout>
If you want to achieve something like this:
You can do that either with RelativeLayout or LinearLayout.
For LinearLayout you explicitely add space between the buttons. This is because the android:layout_gravitypositions the view only within the space, that LinearLayout has given. And this space is not the LinearLayout itself, but the sum of all views, that were layed out linearly (as the name says).
Here's my way of putting the two buttons:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<Button
android:id="#+id/btnadd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add" />
<ImageView
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#android:color/transparent" />
<Button
android:id="#+id/btncancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel" />
</LinearLayout>
I always prefer LinearLayout over RelativeLayout as I experienced LinearLayout as more robust, especially on Android's 2.x versions.
BTW: The difference between android:layout_gravity and android:gravity:
The layout_gravity tells the parent layout of a view to position the whole view within the bounds that the layout defines. In case of LinearLayout this is the space that was allocated by linearly putting the views one after the other.
The gravity tells the view to position its foreground within the available space. You might have seen, that your Add-Button has shown the text on the right side.
Is it possible to align a view in XML in a RelativeLayout centered horizontal or vertical according another already existing view.
For example: lets say there is something like this:
The second text view should be displayed centered below the first text view:
<?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/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginLeft="72dp"
android:text="dynamic text" />
<TextView
android:id="#+id/second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textView"
android:layout_marginLeft="43dp" <!-- Is there a rule to center it? -->
android:text="centered below text 1" />
</RelativeLayout>
Is is possible to implement something like that in XML? Is there a rule that i have missed yet? I do not want to calculate the position programmatically
I have a much better solution than the accepted one. NO EXTRA NESTING! You can do this by combining two attributes on the smaller view. if you are centering horizontally you can use both align_start & align_end to the bigger view. Make sure the text gravity is centered btw "android:gravity="center". For Vertical alignment use both align_top & align_bottom. below is the modified implementation of your layout.
<?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"
android:paddingLeft="43dp" >
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignStart="#+id/second"
android:layout_alignEnd="#+id/second"
android:gravity="center"
android:text="dynamic text" />
<TextView
android:id="#+id/second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textView"
android:gravity="center"
android:text="centered below text 1" />
</RelativeLayout>
No need for unnecessary nesting like the accepted answer.
Use a separate parent layout for those views and add it in your main layout(can contain other things if you have)
<?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" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center"
android:layout_marginLeft = "30dp">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="dynamic text" />
<TextView
android:id="#+id/second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="centered below text 1" />
</LinearLayout>
...
...
other veiws go here
...
</RelativeLayout>
Use the followings which suits you
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
Correct solution is to use ConstraintLayout
I tried to align a textview horizontally below a button in a RelativeLayout but it was not possible as align_bottom and layout_below didn't play well together. Finally i picked up constraintLayout and tried the same logic and it worked like a charm. here is the code below.
<android.support.constraint.ConstraintLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false"
xmlns:android="http://schemas.android.com/apk/res/android">
<Button
android:id="#+id/episode_recording_header_stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#mipmap/ic_launcher"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.399" />
<TextView
android:id="#+id/button_selected_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:textAlignment="center"
android:textColor="#android:color/black"
android:textSize="12sp"
android:text="text which is exactly center aligned w.r.t the Button above"
app:layout_constraintEnd_toEndOf="#+id/episode_recording_header_stop"
app:layout_constraintStart_toStartOf="#+id/episode_recording_header_stop"
app:layout_constraintTop_toBottomOf="#+id/episode_recording_header_stop"
/>
</android.support.constraint.ConstraintLayout>
The final output is attached below
Do this->
<?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/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="dynamic text" />
<TextView
android:id="#+id/second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView"
android:layout_centerHorizontal="true" <!-- Is there a rule to center it? -->
android:text="centered below text 1" />
</RelativeLayout>
I found the solution:
Wrap the content into another RelativeLayout and then you can place this LayoutWrapper wherever you want:
<?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" >
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="58dp"
android:layout_marginTop="58dp" >
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerInParent="true"
android:text="dynamic text" />
<TextView
android:id="#+id/second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView"
android:layout_centerInParent="true"
android:text="centered below text 1" />
</RelativeLayout>
</RelativeLayout>
If you need to use RelativeLayout please don't use the nested layouts as far as possible. Today we have many other efficient cases to solve your task. But with use of the old faithful RelativeLayout the better way is to use attributes android:layout_alignTop, android:layout_alignBottom and android:gravity. For example, you would like to align TextView according to EditText vertically.
<RelativeLayout ...>
...
<TextView
android:id="#+id/tv1"
...
android:gravity="center"
android:layout_alignTop="#+id/edt1"
android:layout_alignBottom="#id/edt1"/>
<EditText
android:id="#+id/edt1"
...
android:layout_toRightOf="#id/tv1"/>
</RelativeLayout>
In the same way you can use android:layout_alignLeft, android:layout_alignRight and android:gravity or android:layout_alignStart, android:layout_alignEnd and android:gravity horizontally.
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