Develop Reference

RecyclerView wraps its conent

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

Android ImageButton fit height to width during onCreateView()?

please help me, how to align the height to width. I've tried everything, it is not working.
Edit: Added full layout.
The code to create the button looks like this
LinearLayout showLayout = (LinearLayout) view.findViewById(R.id.show_full_btn);
showButton = new ImageButton(activityContext);
<LinearLayout
android:id="#+id/top_layout"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.3"
android:orientation="horizontal">
<LinearLayout
android:id="#+id/count"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.1"
android:orientation="vertical">
</LinearLayout>
<TextView
android:id="#+id/w_tv"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.8"
android:typeface="normal"/>
<LinearLayout
android:id="#+id/show_full_btn"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.1"
android:scaleType="fitXY"
android:orientation="horizontal">
</LinearLayout>
</LinearLayout>
Thanks.

You are giving android:scaleType to a LinearLayout which is not applicable, it works with ImageButtons, so declare your view as an ImageButton instead and apply scalyType to it, or if you kinda stuck with a layout, just make as this answer says:
Try using FrameLayout with an ImageView and LinearLayout inside. For
example, try changing the alpha of the image and move it to foreground
in your FrameLayout, thus the LinearLayout stays on background.

If you're finding it difficult to get your results from the XML layout, then try to do it within the onCreate method of your activity. You can easily get it done.

You are talking about an ImageButton in your question, but have not used an ImageButton in your XML, just LinearLayout. Also, in your java, the showLayout and showButton are two separate variables, and not connected.

FrameLayout - adding content to FrameLayout to display properly

I'm using FrameLayout cause for some reason when I add fragments to my main layout the new fragment needs to be a FrameLayout to get the proper match_parent height.
But now I am facing an issue with laying out the content of the FrameLayout. It is complaining because I am using a LinearLayout inside a FrameLayout.
How do you layout content in a FrameLayout?
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="#+id/ivLogo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:src="#drawable/lhf"
android:contentDescription="#string/Logo"
android:alpha="0"
android:rotation="0"
android:scaleX="0.0"
android:scaleY="0.0"
android:layout_gravity="top"
android:x="150dp"
android:y="150dp"
/>
<TextView
android:id="#+id/txtWelcome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/welcome"
android:textSize="12sp"/>
</LinearLayout>
</FrameLayout>
UPDATED
I get the following warning
Multiple annotations found at this line:
- This LinearLayout layout or its FrameLayout parent is useless
- This tag and its children can be replaced by one <TextView/> and a compound drawable

It is not an error it is a lint warning. You can replace the ImageView using compound drawable of that TextView and no need of that LinearLayout.
You can set drawable on that TextView using one of these attributes.
android:drawableLeft
android:drawableTop
android:drawableRight
android:drawableBottom
http://developer.android.com/reference/android/widget/TextView.html#setCompoundDrawablesWithIntrinsicBounds%28int,%20int,%20int,%20int%29

Adding Button To LinearLayout

I'm trying to add a button to a LinearLayout dynamically. Here is my code:
JAVA
LayoutInflater inflater = mMainActivity.getLayoutInflater();
View layout = inflater.inflate(R.layout.browse_list_fragment, (ViewGroup) getView(), false);
LinearLayout breadcrumb = (LinearLayout) layout.findViewById(R.id.browse_list_fragment_previous);
Button button = new Button(mMainActivity);
button.setText(name);
button.setTextColor(mMainActivity.getResources().getColor(R.color.action_bar_breadcrumb));
button.setTextSize(22);
button.setTypeface(Typeface.createFromAsset(mMainActivity.getAssets(), "HelveticaNeueBold.ttf"));
button.setTag(mHashMap);
breadcrumb.addView(button, new LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
XML
<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:id="#+id/browse_list_fragment_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#android:color/white">
<Button android:id="#+id/browse_list_fragment_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:text="#string/button_menu"
android:textColor="#color/grey"
android:background="#android:color/transparent"
android:drawableLeft="#drawable/carrot_grey"
android:onClick="buttonClick"/>
</LinearLayout>
<LinearLayout android:id="#+id/browse_list_fragment_previous"
android:layout_width="match_parent"
android:layout_height="100dp"
android:orientation="vertical">
</LinearLayout>
<ListView android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:paddingLeft="5dp"/>
</LinearLayout>
The Problem
I don't have any exceptions thrown and when I connect the debugger and step through the code I can see that the button is in fact added to the layout. I have tried inflating a button and adding it, different combinations of Java and XML code, stubbing out lines of code, using RelativeLayout as the root layout, removing different parts of the layout and using different widths and heights but I can't ge this button to show up on the screen. Can someone can see what I'm doing wrong or at least point me in the right direction? I'd greatly appreciate it.

You called inflater.inflate() with false as the last argument:
View layout = inflater.inflate(R.layout.browse_list_fragment,
(ViewGroup) getView(), false);
So you are not adding the layout to any view and thus can't see the button you added to this layout. Try to call inflate() with true or add the layout later to the view.

Dynamically adding views to RelativeLayout inside ScrollView

I am trying to add dynamically created several RelativeLayouts into a LinearLayout which is inside a RelativeLayout, which is inside a ScrollView. When the total height of the all views exceed the size of the phone screen, all views are displayed correctly. But when the total size of dynamically added views is not enough for filling the screen, only the first RelativeLayout element is shown and the others are not displayed in the screen. I am really hopeless and do not understand why.
Here is the code to dynamically populate views inside linear layout:
LinearLayout commentsLayout = (LinearLayout) findViewById(R.id.comments_layout);
LayoutInflater inflater = (LayoutInflater)
this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
for(Comment c: commentsList) {
RelativeLayout layoutItem = (RelativeLayout) inflater.inflate(
R.layout.list_item_comment, null, false);
TextView tv = (TextView) layoutItem.findViewById(R.id.textView);
ImageView iv = (ImageView) layoutItem.findViewById(R.id.imageView);
// set tv's text
// set iv's image and onclicklistener, nothing fancy here, everything goes well
commentsLayout.addView(layoutItem);
}
Here is list_item_comment.xml:
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#color/white"
>
<ImageView
android:id="#+id/imageView"
android:layout_width="50dip"
android:layout_height="50dip"
android:layout_alignParentLeft="true"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
/>
<TextView
android:id="#+id/textView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_margin="10dp"
android:textSize="16sp"
android:layout_toRightOf="#id/imageView"
/>
</RelativeLayout>
And here is the xml file for this activity:
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/main_layout"
>
...
<ScrollView
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:id="#+id/scrollView"
>
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/relativeContainer"
>
...
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/comments_layout"
/>
</RelativeLayout>
</ScrollView>
</RelativeLayout>
And the screenshots:
Without sufficient layouts: (INCORRECT, needs to show 3 comments)
With enough layouts: (CORRECT ONE, screen is filled)
I just need to show all three comments in the first case :/ Thanks in advance.

instead of fill_parent, try changing the layout_height of the <RelativeLayout> of your list_item_comment.xml to wrap_content.
Also, why do you need another <RelativeLayout> inside your <ScrollView> of the xml of your activity. The LinearLayout is sufficient to do what you want your activity to look like. Maybe you can just remove it.