Develop Reference

LinearLayout not showing all its children

After creating a LinearLayout with ImageViews as its children, I noticed that only the first row of items are shown. I thought the LinearLayout would automatically wrap its children onto a new line as necessary? The width seems fine but not the height.
Expected result
Expected blueprint (ImageView count is not to scale)
For some reason, when I create a LinearLayout inside another view, the width is shown correctly, but it never seems to adjust its height to fit & show all the children inside it.
Current result
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cv_facilities">
<LinearLayout
android:id="#+id/ll_facilities"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="10dp">
<LinearLayout
android:id="#+id/ll_titlerow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/iv_expandcollapsearrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp" />
<ImageView
android:id="#+id/iv_topicsymbol"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp" />
<LinearLayout
android:id="#+id/ll_symbols"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/iv_symbol_a"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_language" />
<ImageView
android:id="#+id/iv_symbol_b"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_pets" />
<ImageView
android:id="#+id/iv_symbol_c"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_verified_user" />
<ImageView
android:id="#+id/iv_symbol_d"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_transport" />
<ImageView
android:id="#+id/iv_symbol_e"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_seat" />
<ImageView
android:id="#+id/iv_symbol_f"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_fingerprint" />
<ImageView
android:id="#+id/iv_symbol_g"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_areoplane_depart" />
<ImageView
android:id="#+id/iv_symbol_h"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_areoplane_arrive" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>

This behavior of LinearLayout is "as intended": it will display its children in a horizontal or vertical line.
Since all of the child Views in your blueprint seem to be of a similar size, consider switching to GridLayout, it is available as androidx-library (e.g. androidx.gridlayout:gridlayout:1.0.0).
For child Views with varying dimensions, FlexboxLayout is a good alternative. It was introduced in a blog post in February 2017. There is a version for androidx available: 'com.google.android:flexbox:1.1.0'

A horizontal LinearLayout will not automatically wrap to a second line to fit it's children. Per the Android documentation it only supports a single direction:
LinearLayout is a view group that aligns all children in a single
direction, vertically or horizontally
What you could do is use flexbox-layout to achieve the wrapping behavior.

Don't make horizontal linearLayout with 6 imageView's
Make new vertical linearlayout and put on it two horizontal linear layout for each one 3 imageView .

Android: centering buttons with percent width

I have in my Android app a fairly simple Activity that displays three buttons, each launching a different Activity. Currently, I use a RelativeLayout to center the middle button both horizontally and vertically, then place the top and bottom buttons 30dp off the middle one (and also horizontally centered).
What I'd like to do, however, is make the buttons stretch to be a certain percentage of the screen width. I can't figure out how to do this and keep the buttons centered. Is there a good object I can use as a "filler" in a LinearLayout on either side of the buttons (so I could just set the weights)? Or is there a way to do this that doesn't involve a LinearLayout?
The XML for the layout as it stands is:
<RelativeLayout 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" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button2"
android:layout_centerHorizontal="true"
android:layout_marginBottom="30dp"
android:onClick="button1Callback"
android:text="#string/button1Label" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:onClick="button2Callback"
android:text="#string/button2Label" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button2"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:text="#string/button3Label" />
</RelativeLayout>

Sure. View or Frame both work.
<LinearLayout android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<View android:layout_height="0dp"
android:layout_width="0dp"
android:layout_weight="60" />
<Button android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="20" />
<View android:layout_height="0dp"
android:layout_width="0dp"
android:layout_weight="20" />
</LinearLayout>
works fine as a spacer and seems to be utterly harmless as far as I can tell. I use this quite a bit in my app (although honestly, most of my buttons are fixed-width).
At one point I actually wrote a custom view with proportional layout. But in the end I ended up not using it at all. In almost all cases you can get equivalent proportional layout with judiciously applied weights in a linear layout.

RelativeLayout weight

In a layout resource XML, I have 3 RelativeLayout(s) which are inside a main RelativeLayout. The view will be shown vertically. These 3 RelativeLayout() are set next to each other, and I want them to fill the whole screen, doesnt matter what will be the screen size. My, layout view:
<RelativeLayout 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:background="#drawable/backg"
>
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="#dimen/top_mr_image"
android:src="#drawable/temp" />
<RelativeLayout
android:id="#+id/r1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_below="#+id/imageView1"
android:layout_marginLeft="10dp"
android:background="#drawable/r1bg"
android:layout_weight="1"
>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginLeft="#dimen/txt_mr_right"
android:layout_marginRight="#dimen/txt_mr_right"
android:layout_marginTop="39dp"
android:text="S"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#id/textView1"
android:layout_marginLeft="#dimen/txt_mr_right"
android:layout_marginRight="#dimen/txt_mr_right"
android:text="T"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/r2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignTop="#+id/r1"
android:layout_toRightOf="#+id/r1"
android:layout_weight="1" >
</RelativeLayout>
<RelativeLayout
android:id="#+id/r3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignTop="#+id/r2"
android:layout_toRightOf="#+id/r2"
android:layout_weight="1" >
</RelativeLayout>
I set weight=1 and layout_width=0dp for each relativeLayout and this technique works with buttons, I thought the same will be with relativeLayout, seems my thoughts were wrong. Any idea?
UPD1: I have added an image of what I would like to have

RelativeLayout does not pay attention to android:layout_weight. (That's a property of LinearLayout.LayoutParams, but not of RelativeLayout.LayoutParams.)
You should be able to get the layout you want with a much simpler view hierarchy. It's not clear what you are trying to do, since the last two RelativeLayouts are empty. If you need a purely vertical organization, I'd suggest using LinearLayout instead of RelativeLayout.
EDIT Based on your edit, it looks like you want a horizontal layout of three compound views, each one clickable. I think something like the following will work:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<!-- First column -->
<LinearLayout
android:id="#+id/firstColumn"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="..." />
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="text 1"
. . . />
</LinearLayout>
<!-- Second column -->
<LinearLayout . . . >
. . .
</LinearLayout>
</LinearLayout>
If the contents of the buttons aren't correct, you can replace the second-level LinearLayout views with RelativeLayout if that helps organize the layout better.

RelativeLayouts do not support weight. You need to use a LinearLayout as a parent container if you want to use weights.

Solution is very simple. I have been looking for weight distribution in relative layout.
It's a small trick for all these kind situations.
Use LinearLayout with android:orientation="horizontal"

You can use Horizontally oriented LinearLayout Manager in the Recycler View, and place each RelativeLayout in each item, of its Adapter.
The Link: How to build a Horizontal ListView with RecyclerView?
If your RelativeLayouts are set to a fixed width and height, that is to the size of the Screen, that you can get from DisplayMatrics, that will be OK.
The Link: Get Screen width and height
If the contents of your RelativeLayouts are different, then you can use getItemViewType() method.
Please see: How to create RecyclerView with multiple view type?
Happy Coding :-)

Position with items in LinearLayout

How do I design an android application with two buttons next to each other (horizontal) and below these buttons i have a textview (vertical) using LinearLayout? Can't get it to work.

<LinearLayout android:layout_width="fill_parent"
android:layout_height="wrap_content" android:orientation="horizontal">
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" />

Far better to use the RelativeLayout in this case. You just described your desired result in terms of the items of your view relative to one another. It is simpler to use than you might think.
http://developer.android.com/resources/tutorials/views/hello-relativelayout.html

Android Linear Layout - How to Keep Element At Bottom Of View?

I have a TextView which I want to pin at the bottom of a landscape activity that is using LinearLayout with vertically arranged elements.
I have set android:gravity="bottom" on the text view, but it still likes to be just below the last element of the LinearLayout exactly what I do not want it to do.
Any suggestions?

You will have to expand one of your upper views to fill the remaining space by setting android:layout_weight="1" on it. This will push your last view down to the bottom.
Here is a brief sketch of what I mean:
<LinearLayout android:orientation="vertical">
<View/>
<View android:layout_weight="1"/>
<View/>
<View android:id="#+id/bottom"/>
</LinearLayout>
where each of the child view heights is "wrap_content" and everything else is "fill_parent".

Update: I still get upvotes on this question, which is still the accepted answer and which I think I answered poorly. In the spirit of making sure the best info is out there, I have decided to update this answer.
In modern Android I would use ConstraintLayout to do this. It is more performant and straightforward.
<ConstraintLayout>
<View
android:id="#+id/view1"
...other attributes elided... />
<View
android:id="#id/view2"
app:layout_constraintTop_toBottomOf="#id/view1" />
...other attributes elided... />
...etc for other views that should be aligned top to bottom...
<TextView
app:layout_constraintBottom_toBottomOf="parent" />
If you don't want to use a ConstraintLayout, using a LinearLayout with an expanding view is a straightforward and great way to handle taking up the extra space (see the answer by #Matthew Wills). If you don't want to expand the background of any of the Views above the bottom view, you can add an invisible View to take up the space.
The answer I originally gave works but is inefficient. Inefficiency may not be a big deal for a single top level layout, but it would be a terrible implementation in a ListView or RecyclerView, and there just isn't any reason to do it since there are better ways to do it that are roughly the same level of effort and complexity if not simpler.
Take the TextView out of the LinearLayout, then put the LinearLayout and the TextView inside a RelativeLayout. Add the attribute android:layout_alignParentBottom="true" to the TextView. With all the namespace and other attributes except for the above attribute elided:
<RelativeLayout>
<LinearLayout>
<!-- All your other elements in here -->
</LinearLayout>
<TextView
android:layout_alignParentBottom="true" />
</RelativeLayout>

I think it will be perfect solution:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- Other views -->
<Space
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<!-- Target view below -->
<View
android:layout_width="match_parent"
android:layout_height="wrap_content">
</LinearLayout>

Step 1 : Create two view inside a linear layout
Step 2 : First view must set to android:layout_weight="1"
Step 3 : Second view will automatically putted downwards
<LinearLayout
android:id="#+id/botton_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<View
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<Button
android:id="#+id/btn_health_advice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>

You should put the parameter gravity to bottom not in the textview but in the Linear Layout. Like this:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="bottom|end">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Something"/>
</LinearLayout>

You can also use
android:layout_gravity="bottom"
for your textview

DO LIKE THIS
<LinearLayout
android:id="#+id/LinearLayouts02"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="bottom|end">
<TextView
android:id="#+id/texts1"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_weight="2"
android:text="#string/forgotpass"
android:padding="7dp"
android:gravity="bottom|center_horizontal"
android:paddingLeft="10dp"
android:layout_marginBottom="30dp"
android:bottomLeftRadius="10dp"
android:bottomRightRadius="50dp"
android:fontFamily="sans-serif-condensed"
android:textColor="#color/colorAccent"
android:textStyle="bold"
android:textSize="16sp"
android:topLeftRadius="10dp"
android:topRightRadius="10dp"
/>
</LinearLayout>

try this
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:orientation="vertical" >
<TextView
android:id="#+id/textViewProfileName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>