I have a Recyclerview which is working fine with the Android version 23 but if i am running the same code with the Android version 25 then the whole screen is occupied by the single item.
Initially the list looks fine where the item height is wrap content. But as i scroll the whole screen is occupied by single item.
Below is my layout containing RecyclerView:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:scrollbars="vertical" />
</LinearLayout>
Your Recyclerview code is ok.
if you are using TextView or else in your iteam_raw.xml then make sure you give
"wrap_content"
iteam_raw.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
Please use recyclerview item's main layout height "wrap_content".
Make sure that the all UI element you are using in ViewHolder must have height to wrap content and if you are using cardview as parent container make that height also wrap_content.
change the layout_height property from match_parent to wrap_content or some size in your linearlayout.
example:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="120dp" <-- **change in height**
android:layout_width="match_parent"
android:orientation="vertical">
Set layout height and width to 0dp
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_height="0dp"
android:layout_width="0dp"
android:scrollbars="vertical" />
Related
I am using the RecyclerView to inflate a Linear Vertical listViews, However, although the width of a child is set to match_parent, RecyclerView wraps that at runtime.
Here is a screenshot of the problem:
item_recyclerView
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="#+id/tag_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="0dp"
android:maxLines="2"/>
<TextView
android:id="#+id/tag_role"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<com.google.android.material.imageview.ShapeableImageView
android:id="#+id/user_pic"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_weight="0"
android:rotation="-45"
android:scaleType="centerCrop"
android:src="#drawable/ic_user"
app:shapeAppearanceOverlay="#style/ShapeAppearanceOverlay.App.circleImageView" />
</LinearLayout>
When inflating a layout file, the layout_ attributes on the root view will be ignored unless you specify a parent ViewGroup in the inflate() call. You are not currently doing so.
In your onCreateViewHolder() method, replace this:
ItemQuestionPostBinding binding = ItemQuestionPostBinding.inflate(inflater);
with this:
ItemQuestionPostBinding binding = ItemQuestionPostBinding.inflate(inflater, parent, false);
Note also that you probably don't want to be using match_parent for the height of your RecyclerView's items:
android:layout_width="match_parent"
android:layout_height="match_parent"
This will give the appearance that only a single item is visible in your RecyclerView, since each item will be the full height of the screen. This is currently not a problem for the exact same reason that the match_parent width is being ignored.
give for your parent linearlayout weightSum 5
give for imageView weight 1 and do his width 0
and for child linearlayout weight 4
enter code here
I have a ConstraintLayout in Android studio, I want this to have the height be 60% of the screen size for whatever device it is running on, I am wondering how I can do this in xml?
Currently I have:
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/recycler_view_container"
android:layout_width="match_parent"
android:layout_height="372dp" // BAD!! HARDCODED
android:background="#color/white">
</androidx.constraintlayout.widget.ConstraintLayout>
How could I do this? As you see, the layout_height is hardcoded right now.
Here is my answer. I think it should clear your requirements.
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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:background="#color/colorWhite">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#color/colorRed"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintHeight_percent="0.50">
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
You can change height percentage according to your needs. Thanks.
You can't do that directly, however you can put a guideline within your ConstraintLayout fixed at a percentage of the height. Children views can then use that constraint to set their height.
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent"
android:layout_width="match_parent"
>
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guide"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.6"
/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rcv"
android:layout_height="0dp"
android:layout_width="0dp"
app:layout_constraintBottom_toTopOf="#id/guide"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
I'm guessing your ConstraintLayout is meant to contain a RecyclerView?
You're going to want to use an unequal LayoutWeight.
LinearLayout supports assigning a weight to individual children with the android:layout_weight attribute. This attribute assigns an "importance" value to a view in terms of how much space it should occupy on the screen. Set the child view layout_height to 0 and assign the screen proportion as desired to each child view.
This is how I would set up the XML for your specifications, notes included in the code.
<?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"> // Note: set orientation to vertical
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="0dp" // Note: Set the layout_height to 0
android:layout_weight="6" // Note: Set weight to 6
android:background="#color/colorAccent"/>
// Framelayout need to fill remain space
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp" // Set the layout_height to 0
android:layout_weight="4"/> // set the weight to 4
</LinearLayout>
The constraint layout has a weight of 6 and FrameLayout has a weight of 4, the LinearLayout has a total weight of 10. 6/10 is 60%, the constraint layout will fill 60% of the screen.
The question has changed after I posted this answer, you can also equal distribution, which is the same as unequal assign the same weight value to each child view, and the screen will be split equally among the child views.
<?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">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#color/colorAccent"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
</LinearLayout>
ConstraintLayout has a weight of 1 and FrameLayout has a weight of 1, total layout weight is 2. 1/2 is 50%, the ConstraintLayout will take up 50 of the screen.
I've been working on an app and am looking to adding a text view below the Camera view so that I could display some text there.
But, for some reason when trying to drag a text view into the layout it doesn't show up on the final screen.
This is my code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/topLayout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:keepScreenOn="true">
<com.google.android.CameraSourcePreview
android:id="#+id/preview"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.GraphicOverlay
android:id="#+id/faceOverlay"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</com.google.android.CameraSourcePreview>
</LinearLayout>
Layout view com.google.android.CameraSourcePreview height is set as 'match_parent' , so its eating up all the space on the view-port.
Try giving particular height and you should be able to see textview added below CameraSourcePreview.
Hope it helps.
Most likely, you're not able to add the TextView due to there not being enough space on the screen.
You're using a LinearLayout which displays all of it's views one after the other in either a vertical or horizontal manner.
Your CameraSourcePreview has it's height and width set to match_parent, which means it'll stretch completely on the screen. However, in a LinearLayout, this also means that there's no space to place the next View because it'll be placed off the screen.
You can add android:layout_weight="1" to your CameraSourcePreview. This will allow your TextView to fit into the LinearLayout because it's basically your CameraSourcePreview telling others it'll resize itself to allow for other components to fit on the screen.
But if you don't want your CameraSourcePreview to resize itself based on other Views, then you should look into using some other Layouts instead of LinearLayout. Perhaps one such as ConstraintLayout or RelativeLayout will work better, since they allow overlapping Views on top of each other.
This is happening because the height of the camera view is taking the whole space on the display you can use layout_weight for LinearLayout to make some necessary space for your TextView.
Just make height of CameraSourcePreview equals to 0dp and add a property
android:layout_weight="1"
So this it would look like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/topLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:keepScreenOn="true"
android:orientation="vertical">
<com.google.android.CameraSourcePreview
android:id="#+id/preview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<com.google.android.GraphicOverlay
android:id="#+id/faceOverlay"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</com.google.android.CameraSourcePreview>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="some text here" />
</LinearLayout>
Instead of using LinearLayout I suggest to use FrameLayout which is easy to control for your case. It is also possible to display textView on CameraSourcePreview by using following code
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/topLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:keepScreenOn="true">
<com.google.android.CameraSourcePreview
android:id="#+id/preview"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_gravity ="center">
<com.google.android.GraphicOverlay
android:id="#+id/faceOverlay"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</com.google.android.CameraSourcePreview>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="some text here"
android:layout_gravity ="center|bottom" />
</FrameLayout>
I'm having an issue with ScrollView which leaves a blank space at the bottom. It is filled with few TextViews and GridViews and should fill the whole RelativeLayout parent.
<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="wrap_content"
tools:context=".showPictures">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView.../>
<GridView.../>
...
</LinearLayout>
</ScrollView>
</RelativeLayout>
Does anybody have an idea what's wrong?
Make your relative layout height match parent, also use android:fillViewPort = "true" in your scroll 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"
tools:context=".showPictures">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
//...
you can use this code to avoid extra padding on bottom of scroll view:
android:overScrollMode="never"
In my case I had a GridView inside a ScrollView that was causing this issue. It turns out the the layout_gravity in the GridLayout as 'center' was causing this issue.
'center_horizontal' makes more sense for a ScrollView anyway, but I added the ScrollView after the original layout was done (using 'center'), when I saw that the elements were going off-screen on some devices, hence the issue.
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<GridLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" // having this as android:layout_gravity="center" causes extra space at bottom!
android:columnCount="2">
....
Give weight to every child in the scroll view including linear layout with value 1
I have a scrollable LinearLayout parent with a few FrameLayouts nested inside it as follows:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:scrollbars="vertical"
android:orientation="vertical">
<FrameLayout
android:id="#+id/hb_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="#+id/gn_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="#+id/yt_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
I would like FrameLayouts to take up the space they need, allowing for scrolling of the full view through the LinearLayout.
Issue is: the LinearLayout will only take up the screen, it won't scroll, instead the FrameLayout's will scroll if the content overflows the bottom of the screen.
To be clear, I just want the FrameLayouts to fill whatever space they need, and the LinearLayout can scroll it like one long view. Must I fix the FrameLayout heights to achieve this? If so, is there risk of my layout breaking on different screen sizes/densities (or does DP really work in all cases?).
Thank you immensely!
EDIT: I have confirmed that setting fixed heights in the FrameLayout does exactly what I want this to do: scroll as one. However, why doesn't wrap_content measure the height and then go from there? That is what I expected the case was... I'm not certain how to judge the right heights for each element.
Try adding a scrollview to the layout
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:orientation="vertical">
<FrameLayout
android:id="#+id/hb_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="#+id/gn_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="#+id/yt_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</ScrollView>