Develop Reference

RecyclerView get hidden under dynamic view in android

I have a RecyclerView in an xml and a LinearLayout at the bottom of that Activity. This activity works as a chat window where a question appears as the chat message and user gets some random multiple choice options in the view, but when the RecyclerView gets populated with a page full of data, I want to make that RecyclerView always above the layout where options are created, but what I have done so far does not work as expected, the RecyclerView data always gets hidden under the layout and each time I need to scroll down to see what's written there. I have used the method
adapter.notifyItemInserted(array.size());
recyclerView.scrollToPosition(array.size());
This adds item in the RecyclerViewand also scrolls down but it gets hidden under the layout, but I have set it always above the layout in the xml, I think the problem is I am creating some views dynamically in that layout which's size is wrap content, so the RecyclerView is not being updated time to time with the height of the layout in the bottom. Here is the xml code of that Activity
<?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/rlMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ChatBotActivity">
<include
android:id="#+id/header"
layout="#layout/header"></include>
<android.support.v7.widget.RecyclerView
android:id="#+id/rcv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/ll"
android:layout_below="#+id/header" />
<LinearLayout
android:id="#+id/ll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="vertical"></LinearLayout>
<LinearLayout
android:id="#+id/ll2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal"
android:visibility="invisible"
android:weightSum="7">
<EditText
android:id="#+id/etMessage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="5"
android:hint="Type a message"
android:paddingLeft="#dimen/ten_dp"
android:textColorHint="#color/fade" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_gravity="center"
android:layout_marginRight="#dimen/five_dp"
android:layout_weight="2"
android:background="#android:color/transparent"
android:onClick="sendClick"
android:src="#drawable/ic_send_black_24dp"
android:text="send" />
</LinearLayout>
</RelativeLayout>
The RecyclerView is always above of the LinearLayout which id is ll but I am populating that layout from the java and it's height changes time to time, but RecyclerView height doesn't changed accordingly, please help!

Finally I myself solved the question, It was a funny mistake I was doing, the layout was all right, but my recylerview was just not scrolling, I had to change this:
Previous:
adapter.notifyItemInserted(array.size());
recyclerView.scrollToPosition(array.size());
Later:
adapter.notifyItemInserted(array.size()-1);
recyclerView.scrollToPosition(array.size()-1);

Define view to be scrolled over in xml at start

I load a smiliar layout when my fragment starts:
<ScrollView
android:layout_height="wrap_content"
android:layout_width="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<View
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/firstView" />
<View
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/secondView" />
</LinearLayout>
</ScrollView>
When the fragment starts I want my firstView to be (so to speak) hidden and when a user scrolls down it should move with secondView so it becomes visible.
Basically I would like my ScrollView to be started with negative position. The problem is I don't know the height of firstView.
Is it possible to define this behavior with xml attributes?
Regards,
roncsak

Well, it can be done with CollapsingToolbarLayout.
Material design spec: https://material.io/develop/android/components/collapsing-toolbar-layout/

TextView cutting off content

I have a TextView within a ScrollView all wrapped in a LinearLayout and the end of the TextView is getting cutoff (multiple lines).
This is the XML:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="false">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/tv_description"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp"
android:text=""
android:textSize="10dp"
android:layout_weight="1"
android:layout_gravity="fill_vertical" />
</ScrollView>
</LinearLayout>
The TextView is cutting off regardless of whether the pane scrolls or not and it's driving me mad! Any help?!

<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">//try this
if this doesnt solve the problem then:-
also you can try using ScrollView as a parent view.No need of that Linear layout if it just contains a single child(TextView)

Update. I 'fixed' the issue by changing the type of the fragment to work as a RecyclerFragment. Which when the fragment is added to the rest of the structure stops the cut-off!
I've inherited this app mid-development and the hand-over was...finish this app and fix the bugs, so I am finding my way through wearing a blindfold!
Thanks anyway!

Setting maximum height on RecyclerView

I have a dialog fragment that contains linear layout that involves a titleText above a RecyclerView, and at the very bottom, there's a button below the recyclerView.
Since a recyclerView expands or collapses based on the number of items the adapter sets, the button sometimes gets truncated and no longer appears to be on screen, since the recyclerView just covers the entire screen.
My question is, is there a way to set the maximum height of the recyclerView without ever hiding the button underneath. I also don't want to just give the view a random height just in case the recyclerView contains no items, and it would just be a blank section.
Please let me know if you've ever run into this issue, and how you resolved this. Thanks!

UPDATED
You can achieve this easily using layout weights. Here's an example:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Title"
android:textSize="21sp"/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="30dp">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="Submit"/>
</FrameLayout>
The Title and RecyclerView will wrap content according to contents and button will always take up bottom place.

I suggest using RelativeLayout as it handles the positioning of views for cases like yours, so that you can actually focus on main design.
<?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="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="Some title" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/title"
android:layout_above="#+id/button"/>
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:gravity="center"/>
</RelativeLayout>
Above XML code is the skeleton code for what you need. you can add margins and dimensions to control the spacing. But in any case (until you provide negative margins) your views will never overlap each other.
Main trick of using RelativeLayout is the ability to use XML tags like
android:layout_below or android:layout_above or android:layout_start
or android:layout_end which perfectly aligns your view the way you
want.

Layout issue with Android Studio

Recently picking up android development, I have hit a snag in the road. I'm having trouble positioning my layouts. Screenshots are as follows:
I'm trying to input either another layout type/list view in the upper section of the screen, without disrupting the button/text box at the bottom, though.. When extending this layout. I hit the following snag:
The entire contents of the original frame shift when the box of the new layout is extended, I've tried modifying:
android:layout_gravity="top">
and other layout attributes such as weight, margin, height/width.. This always hits the same problem.
My XML for this view is:
<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="horizontal" >
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="483dp"
android:layout_weight="1.06"
android:layout_gravity="top">
</FrameLayout>
<EditText android:id="#+id/edit_message"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="#string/edit_message"
android:layout_gravity="bottom" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send"
android:layout_gravity="bottom"
android:onClick="SendMessageButton"
/>
</LinearLayout>
Though, i'm some-what stuck on how to make the correct changes & any response to this question would be greatly appreciated!

At the moment, all your child views live inside a single horizontally-oriented LinearLayout. LinearLayouts always arrange views sequentially, as you are experiencing.
There are a couple different ways to achieve the layout you are looking for. I'm going to suggest one that uses nested LinearLayouts (an outer one to stack things vertically, and then a nested one to arrange the EditText and Button horizontally), but you could also consider using a RelativeLayout for this.
Updated layout:
<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">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:id="#+id/edit_message"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="#string/edit_message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send"
android:onClick="SendMessageButton" />
</LinearLayout>
</LinearLayout>
Note that a LinearLayout is oriented horizontally by default; I have explicitly included the attribute here to make the structure more clear.

The reason, your button and editText is appearing far from the frame layout and not near the corner is the parent layout orientation is Horizontal.
Change it to Vertical.
Now, if you need your button and editText to be arranged in the same line, it should be mentioned as described in samgak answer.
However, i would like to suggest the following.
Using framelayout might create bad user experience across different screen sizes in android.
If the parent layout in Linear, if the screen size is x and all your components added if the height it takes is x-20, then the theme you set for parent layout would not cover the entire screen. Therefore, it is recommended to use RelativeLayout and for the button and editText, use the layout_alignParentBottom = true attribute.
If needed, i can share the code sample for this. Added Vertical Scroll to the layout.
<ScrollView 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"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="483dp"
android:layout_gravity="top">
</FrameLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<EditText android:id="#+id/edit_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Edit Message"
android:layout_gravity="bottom" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send"
android:layout_gravity="bottom"
android:onClick="SendMessageButton"
/>
</LinearLayout>
</LinearLayout>
</ScrollView>