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 .

TextView below Image not showing up in Android

I am trying to put a text below an image but they are not showing up in android layout.
Here is the screenshot:
I dont' see any text below image.
And my code: inside a relative layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layout_footer"
android:layout_width="match_parent"
android:gravity="center"
android:layout_height="?android:attr/actionBarSize"
android:background="#color/panelcolor" >
<ImageView
android:id="#+id/searchicon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:paddingRight="60dp"
android:src="#drawable/search_white" />
<TextView
android:id="#+id/searchText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="60dp"
android:textColor="#color/whitetext"
android:layout_below="#+id/searchicon"
android:text="Search" />
<ImageView
android:id="#+id/homeicon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:paddingRight="60dp"
android:layout_toRightOf="#+id/searchicon"
android:src="#drawable/ic_home" />
<TextView
android:id="#+id/hometext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="60dp"
android:textColor="#color/whitetext"
android:layout_below="#+id/homeicon"
android:text="Home" />
<ImageView
android:id="#+id/wishicon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_toRightOf="#+id/homeicon"
android:src="#drawable/ic_favorite" />
<TextView
android:id="#+id/wishtext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="60dp"
android:textColor="#color/whitetext"
android:layout_below="#+id/wishicon"
android:text="Wish List" />
<ImageView
android:id="#+id/viewicon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:paddingLeft="60dp"
android:layout_toRightOf="#+id/wishicon"
android:src="#drawable/ic_eye" />
<TextView
android:id="#+id/viewtext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="60dp"
android:textColor="#color/whitetext"
android:layout_below="#+id/wishicon"
android:text="Viewed" />
</RelativeLayout>
Not sure what is wrong?

Assuming you follow Googles Design guidelines
(Tabs with icons and text Height - 72dp;
Icon - 24 x 24dp)
Change 'match_parent' to 'wrap_content' for the ImageViews

The problem is you have put android:layout_height="match_parent" for image views and android:layout_height="wrap_content" for text views. Either use wrap_content for image view or use use a LinearLayout with android:weight property. Using LinearLayout would also solve your problem of alignment if it occurs!

Try setting android:layout_alignParentBottom="true" instead of android:layout_below="#+id/homeicon".
This aligns the text at the bottom of the parent. You might also need to set android:layout_alignLeft="" and align it to the corresponding imageView.
This method will only work, if there is enough padding below the image. This is because the text will now overlap the image.
EDIT:
Another way would be, to set the relative layout to a fixed height you know (like 60dp) and set the imageView to a fixed height (like 40dp). Then the TextView will also show up below the ImageView.

change imagebutton Proportional to size device on android

I am develop xml with some image button,image buttons show properly in emulator but it Disorganization on
devices(for example galaxy fit)
As described in emulator https://www.dropbox.com/s/qeecp868ht61sck/emulator.jpg and galaxy fit https://www.dropbox.com/s/23r9tvtp0tcn7bs/fit.jpg
what change imagebutton Proportional to size device?
what can i do?
this is my xml:
<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"
tools:context=".Main"
android:background="#drawable/backmain" >
<ImageButton
android:id="#+id/btnfehrest"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="53dp"
android:background="#null"
android:src="#drawable/fehrest" />
<ImageButton
android:id="#+id/btndarbareh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/btnfehrest"
android:layout_marginLeft="21dp"
android:background="#null"
android:src="#drawable/darbareh" />
<ImageButton
android:id="#+id/btnmahsulat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/btndarbareh"
android:layout_marginRight="17dp"
android:background="#null"
android:src="#drawable/mahsulat" />
<ImageButton
android:id="#+id/btnkhoruj"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/btndarbareh"
android:layout_centerHorizontal="true"
android:background="#null"
android:src="#drawable/khoruj" />
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/main"
android:scaleType="fitXY" />
</FrameLayout>
</RelativeLayout>

It is all because you are using Relative Layout in your xml
Relative layout always maintains a relationship with other views in your xml either with Parent view or with child views.
so on small screen your FrameLayout with button image trying to fit in the screen as it maintaining the relationship with other views, that's why its overlaping.
Talking about giving the suggestion regarding this.
1) You can use Linear Layout with scroll view, ie if views gets out of screen you can see them by scrolling down.
//If you don't wanna do this
2) You can create another xml in layout-small with same name.
Example:
res> layout> main.xml
and
res> layout-small> main.xml
Second option will help you in creating multi support for different screen sizes.
Note: By Default layout-small folder is not present but you can create it.

How can I evenly space my ImageViews in a RelativeLayout

I had a Android application built in which I had 3 ImageViews placed horizontally across a LinearLayout, they were placed with a android:layout_width="0dp" and android:layout_weight="1" such that they had an even spread in the layout.
Now I have to switch to use a RelativeLayout (because I want to overlap another image and that can't be done with a LinearLayout) so I want to start with replicating the same effect of having the 3 ImageViews evenly spread/scaled across the parent layout, but I'm not sure how to achieve this.
I feel like I need to make use of the android:scaleType... maybe center crop:
Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or larger than the corresponding dimension of the view (minus padding).
Which sounds good but I can't seem to get it to work right... Any thoughts on how I would achieve this even spread of ImageViews across my RelativeLayout?
Snippet of code right now:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal" >
<ImageView
android:id="#+id/dragcircle"
android:layout_width="wrap_content"
android:tag="circle"
android:layout_alignParentLeft="true"
android:layout_height="wrap_content"
android:adjustViewBounds="false"
android:scaleType="centerCrop"
android:src="#drawable/circle" />
<ImageView
android:id="#+id/dragsquare"
android:layout_width="wrap_content"
android:tag="square"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/dragcircle"
android:adjustViewBounds="false"
android:src="#drawable/square" />
<ImageView
android:id="#+id/dragtriangle"
android:layout_width="wrap_content"
android:tag="triangle"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/dragsquare"
android:adjustViewBounds="false"
android:src="#drawable/triangle" />
Note: I can't find a question with the same constraints as this one on SO. There are a number of questions like:
Android: how evenly space components within RelativeLayout?
and
android RelativeLayout, equal spacing?
But if you check out the details you'll see that they are people who have not considered the LinearLayout as an option for equal spacing and switching layout types ends up being the solution. I have, I was using it, but it does not work for me because I need to overlap an image:
Note the example, I have 3 ImageViews with basic shapes, but I also have a 4th ImageView (it starts hidden) which is overlapping the middle one. This is why I must use a RelativeLayout

I think you're going to want to go back to your original LinearLayout to meet all of your needs here.
If the size of your fourth image must match one of your existing image then either you'd want to create a resource that is a composite of the two images to swap to when it needs to be overlaid or replace your center ImageView with a RelativeLayout or FrameLayout that contains the ImageView. When you need to add the fourth image, add it to that layout.
Something like:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="#+id/dragcircle"
android:layout_width="0dp"
android:layout_weight="1"
android:tag="circle"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
android:src="#drawable/circle" />
<FrameLayout
android:id="#+id/centerimagewrapper"
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1" >
<ImageView
android:id="#+id/dragsquare"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:tag="square"
android:src="#drawable/square" />
<ImageView
android:id="#+id/arrow"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:src="#drawable/arrow"
android:visibility="invisible" />
</FrameLayout>
<ImageView
android:id="#+id/dragtriangle"
android:layout_width="0dp"
android:layout_weight="1"
android:tag="triangle"
android:layout_height="wrap_content"
android:src="#drawable/triangle" />

You could hide the icon you want to place on existing images and keep your previous LinearLayout to achieve this. Each component of your LinearLayout would be a custom layout (inflated):
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativeLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
>
<ImageView
android:id="#+id/img"
android:layout_width="100dip"
android:layout_height="100dip"
android:layout_centerInParent="true"
android:scaleType="fitXY"
android:background="#android:color/transparent"
android:src="img1_src"
/>
<ImageView
android:id="#+id/imgOverlap"
android:layout_width="50dip"
android:layout_height="50dip"
android:layout_centerInParent="true"
android:scaleType="fitXY"
android:adjustViewBounds="true"
android:background="#android:color/transparent"
android:src="img2_src"
android:visibility="gone"
/>
</RelativeLayout>
It appears not possible to use "layout_weight" in a RelativeLayout.
You could also consider a GridView and set its number of columns; each item of the GridView would be the inflated layout above.

you could also do it programatically and tell them to be 33% of the screen width. Look at DisplayMetrics and the attributes of each ImageView if you want to achieve this.

Try this
<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="wrap_content" >
<ImageView
android:id="#+id/dragcircle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:scaleType="fitXY"
android:src="#drawable/circle"
android:tag="circle" />
<ImageView
android:id="#+id/dragtriangle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:src="#drawable/triangle"
android:scaleType="fitXY"
android:tag="triangle" />
<ImageView
android:id="#+id/dragsquare"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/dragtriangle"
android:layout_toRightOf="#id/dragcircle"
android:src="#drawable/square"
android:scaleType="fitXY"
android:tag="square" />
</RelativeLayout>

Centering the contents of a view inside a LinearLayout

Here's the layout (below). I'm trying to reposition the location of the checkbox; move it to the right of the view. android:gravity and android:layout_gravity seem to have no effect. Any explanation? This LinearLayout is a child of a Relative Layout.
<LinearLayout
android:id="#+id/deviceLinear"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_below="#id/view1" >
<ImageView
android:contentDescription="#string/devices_icon"
android:id="#+id/devices_img"
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_weight="0.15"
android:layout_gravity="center"
android:src="#drawable/hardware_phone" />
<TextView
android:id="#+id/devices"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0.43"
android:text="#string/devices"
android:textSize="20sp" />
<CheckBox
android:id="#+id/check_devices"
android:button="#drawable/custom_checkbox"
android:layout_width="0dip"
android:layout_height="fill_parent"
android:layout_weight="0.42"
android:onClick="onCheckboxClicked" />
</LinearLayout>

I assume that you want the CheckBox to be on the right side of the LinearLayout. Since you have given it a layout_weight it will always take up some fixed percentage of the width regardless of its size as you can see by that blue bounding box.
Try wrapping the checkbox in another LinearLayout that has android:orientation='horizontal'. Give the 0.42 weight to the wrapping LinearLayout and then set the LinearLayout's android:gravity to be right. That should keep your spacing while moving the checkbox to the far right.
Something like this:
<LinearLayout
android:orientation="horizontal"
android:layout_width="0dp"
android:layout_weight="0.42"
android:layout_height="wrap_content"
android:gravity="right" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
You might also want to consider a RelativeLayout which enables you to position Views based on where other views are.

You are giving layout_weight="0.42" to your checkbox, that means that it will be measured with a width based on the LinearLayout's width. By this approach you will never manage to put it on the right.
The best way to achieve your goal is to use a RelativeLayout. Here is my list item layout with a checkbox on the right. Sorry about the merge tag but it is merged inside a RelativeLayout with
android:layout_width="match_parent"
android:layout_height="wrap_content"
attributes
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView android:id="#+id/imgChannelIcon"
android:layout_alignParentLeft="true"
style="?muListItemImage60x60" />
<CheckBox android:id="#+id/chkIsChecked"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_alignTop="#+id/imgChannelIcon"
android:layout_alignParentRight="true"
android:layout_alignBottom="#+id/imgChannelIcon"
android:layout_marginLeft="#dimen/list_item_checkbox_margin_left"
android:layout_marginRight="#dimen/list_item_checkbox_margin_right"
android:layout_marginTop="#dimen/list_item_checkbox_margin_top"
android:layout_marginBottom="#dimen/list_item_checkbox_margin_bottom"
android:focusable="false"
android:focusableInTouchMode="false" />
<TextView android:id="#+id/lblChannelTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/imgChannelIcon"
android:layout_alignTop="#+id/imgChannelIcon"
android:layout_toLeftOf="#+id/chkIsChecked"
android:layout_alignWithParentIfMissing="true"
android:includeFontPadding="false"
android:textStyle="bold"
android:text="#string/channel_item_dummy_title"
style="?muListItemTextBig" />
<TextView android:id="#+id/lblChannelSubtitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/imgChannelIcon"
android:layout_below="#+id/lblChannelTitle"
android:layout_toLeftOf="#+id/chkIsChecked"
android:layout_alignWithParentIfMissing="true"
android:includeFontPadding="false"
android:textStyle="normal"
android:text="#string/channel_item_dummy_subtitle"
style="?muListItemTextNormal" />
<TextView android:id="#+id/lblChannelCategory"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_toRightOf="#+id/imgChannelIcon"
android:layout_below="#+id/lblChannelSubtitle"
android:layout_alignBottom="#+id/imgChannelIcon"
android:layout_toLeftOf="#+id/chkIsChecked"
android:layout_alignWithParentIfMissing="true"
android:includeFontPadding="false"
android:paddingLeft="3dp"
android:gravity="center_vertical|left"
android:textStyle="italic"
android:text="#string/channel_item_dummy_category"
style="?muListItemTextNormal_Inverse" />
<TextView android:id="#+id/lblChannelUpdate"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_below="#+id/imgChannelIcon"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:includeFontPadding="false"
android:paddingTop="3dp"
android:paddingBottom="3dp"
android:textStyle="italic"
android:text="#string/channel_item_dummy_update"
style="?muListItemTextTiny" />
</merge>
As you can see I first place an image with layout_alignParentLeft="true" then the checkbox with layout_alignParentRight="true" and finally I arrange the other components based on those two. From your image I can see that you can use your devices_img as the left component (but you will have to give it a fixed height and maybe some margins in order to became the Layout's height) and your check box as your right.
Keep in mind that in a RelativeLayout with wrap_content as height you cannot use the AlignParentBottom attribute.
Hope this helps...