Develop Reference

How can I limit the gradient in Android Studio?

I'm developing my first app in Android studio and I have some styles applied to it, and one of them is a gradient background but I want to limit it.
This is my actual view:
The graident goes from top to bottom perfectly, but I want the gradient to occupy 1/4 of the screen, how can I do it? I've been looking on the internet but I didn't find a solution. Up to the red line for example:
How can I do it?
This is my actual drawable:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<gradient
android:angle="-90"
android:startColor="#3cba92"
android:endColor="#e6e9f0"
/>
</shape>
</item>
</selector>

Rather than modifying your drawable, why don't create an empty layout which has height as 1/4th of the screen and background as your drawable.
The rest of your code will remain as it is and should have no background.
For example, this can be done easily using a constraint layout as follows.
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context=".MainActivity"
android:weightSum="1"
>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="250dp"
android:background="#drawable/background_gradient"
app:layout_constraintTop_toTopOf="parent"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
Note : You can set the height programatically by measuring the screen size and dividing it by 4.

How to add a fully transparent to semi-transparent gradient in Android

I have a situation where I want to add an image view doing the same effect as this app
As you notice there is a drawable or something hiding the bottom side of the view adding a transparent gradient. How can I achieve the same effect?

Well, you can use fadingEdge attribute of the listView in your xml. Make a listView, then add items xml (images in particular as you've mentioned above).
android:fadingEdge="horizontal"
android:fadingEdgeLength="30dp"
android:fillViewport="false"
android:requiresFadingEdge="vertical"

Place this drawable in the bottom of your layout:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:startColor="#FFFFFF"
android:endColor="#android:color/transparent"
android:angle="90" />
</shape>
Your layout:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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="#android:color/white" >
<View
android:layout_width="match_parent"
android:layout_height="20dp"
android:background="#drawable/gradient"
android:layout_gravity="bottom"/>
</FrameLayout>

I think you can change alpha value of that image View. Go through
this and this for more details.

How to create a slider on an image

This is what I am trying to achieve
The black rectangle is an image asset which i need to move left and right on related touch events/drags
Being relatively new to Android , I am finding this difficult to implement.
So was hoping I could get some tips,guides,examples if there are any.
EDIT:
I Have tried viewflipper but that is not what I need here,
I tried making a slider like a seek bar , but didn't work out.
Some one suggested that I use a framelayout over the main image to slide but I don't know how to do it.
So any help which will help me out here is appreciated

Use SeekBar because it suits your needs completely.
First create a drawable xml file named "rect_border.xml" in res/drawable folder with these contents:
// **EDITED**
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke
android:color="#000000"
android:width="5dp"
/>
// change the width to any value that suits your needs.
// set the height property greater than your image height
<size android:width="50dp" android:height="360px" />
</shape>
Then in your layout:
// **EDITED**
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="match_parent"
android:layout_height="300px"
android:layout_centerVertical="true"
android:scaleType="fitXY"
android:src="#drawable/your_image"
/>
<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:thumb="#drawable/rect_border"
android:progressDrawable="#android:color/transparent"
/>
</RelativeLayout>
I tested it and I'm sure it's actually what you want (as described).
So what's the problem about the SeekBar?

how to create rounded corner videoview in android?

In my application, I want to display videoview as a rounded corners. I have tried placing videoview/surfaceview inside linearlayout with rounded corner set to linearlayout. but it does not work perfectly. I can not set rounded corner to videoview/surfaceview. I want to set view as below image:
Anyone have idea how to do this?

Not sure why there are so many bad answers when the solution is really simple (as long as you're min sdk > 21). Creating a shape and putting it overtop of the video won't work because you obviously want the background to be transparent to see the views behind it.
I found the answer here Android View Clipping. You just put the video view in a frame layout, add a rounded background to the frame layout, add an outline provider and clip the frame layout to the outline.
The background rounded_video_background:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#000000"/>
<corners android:radius="16dp" />
</shape>
The frame layout and video view inside of it:
<FrameLayout
android:id="#+id/video_view_container"
android:layout_width="90dp"
android:layout_height="120dp"
android:background="#drawable/rounded_video_background"
android:outlineProvider="background">
<VideoView
android:id="#+id/video_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
/>
</FrameLayout>
And the final step is clipping to the outline (didn't see a way to do it in xml so I did it programatically):
video_view_container.clipToOutline = true

Its worked for me,
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_gravity="center"
android:layout_width="match_parent"
card_view:cardCornerRadius="25dp"
android:layout_height="wrap_content">
<VideoView
android:id="#+id/video"
android:layout_width="match_parent"
android:layout_height="215dp" />
</android.support.v7.widget.CardView>

You can make it using a FramLayout & an XML drawable
FramLayout
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<VideoView
android:layout_width="match_parent"
android:layout_height="#dimen/dp_240"
android:layout_margin="#dimen/dp_24"/>
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/rounded_corner_video_bg" />
</FrameLayout>
XML Drawable
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke
android:width="#dimen/dp_24"
android:color="#color/md_white_1000" />
<corners android:radius="#dimen/dp_24" />
</shape>

You could try layering different views on top of each other to create the rounded corners you are looking for. Try placing four ImageViews over the VideoView in each corner, to achieve the desired rounded corners. I have had success using a RelativeLayout to accomplish this, but you could also try using a FrameLayout to hold the Views together.

It is directly not possible, but you can do this by draw a imageview on top of videoview and set an image having transparent from between and solid color in rounded shape on the corners.
check this: Click here

Its simple,
1. Create a drawable with rounded corners as mentioned by #sunil kumar
2. Set that drawable to your layout as a background
3. When using that layout set layout(your layout item name).clipToOutline = true

This is XML code of rounded VideoView.
<androidx.cardview.widget.CardView
android:id="#+id/videoCard"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
app:cardCornerRadius="20dp"
card_view:cardBackgroundColor="#color/white">
<VideoView
android:id="#+id/relativeVideo"
android:layout_width="match_parent"
android:layout_height="225dp"
android:paddingTop="-10dp"
android:paddingBottom="-10dp" />
</androidx.cardview.widget.CardView>
Negative padding is important otherwise height of VideoView is smaller than cardview by half of cornerRadius in both top and bottom side. You can set height whatever you want but negative padding should be half of cardCornerRadius all the time. Purple in the image is a video preview, not related to xml.
Have a nice day!

put rounded.xml in your drawable folder and set on framelayout of video like android:background="#drawable/rounded.xml"
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" android:padding="10dp">
<solid android:color="#FFFFFFFF" />
<corners android:radius="7dp" />
</shape>

Create an xml file in drawable folder called shape_video.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<corners android:radius="6dp" />
</shape>
Change the radius according to your rqmnt and in the background attribute of your videoview, give
android:background="#drawable/shape_video"

How to add space between items in android listview?

I would like to add padding between EACH item in a listview, but I would like to keep the default divider as I think it is aesthetically pleasing. Anything wider looks ugly.
I currently have:
<com.example.practice.MyListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:drawSelectorOnTop="false"
android:layout_below="#id/name" />
Now, I have tried using a transparent divider, and this succeeds at getting the spacing I want, but then I don't see the little line. And if I don't use a transparent divider than I have a huge thick ugly line. I want to keep the default line shown, and just add some spacing on the top part of each listview item.

You wouldn't be able to achieve what you want as simple as that then.
Step one: Set the divider as transparent, and make the height a tad larger:
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:divider="#android:color/transparent"
android:dividerHeight="8dp"/>
Step Two: In order to achieve the 'little line' effect, you can add a custom drawable as the list view item background, say the list view item is defined as 'list_item.xml':
<?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"
<-- Add a Custom background to the parent container of the listview items -->
android:background="#drawable/list_item_selector"
android:orientation="vertical" >
<-- Rest of the item layout -->
</LinearLayout>
Of course, that item can be anything you like it to be, mine is:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape
android:shape="rectangle">
<stroke android:width="1dp" android:color="#color/bg_gray" />
<solid android:color="#android:color/white" />
</shape>
</item>
<item android:bottom="1dp">
<shape
android:shape="rectangle">
<stroke android:width="1dp" android:color="#FFDDDDDD" />
<solid android:color="#00000000" />
</shape>
</item>
</layer-list>
But that would then disable the 'Holo Selector' effect, where whenever you click, or highlight an item on the listview, there is a Holo Blue color drawn over it, that's why if you notice on the list item background we didn't use a layer list drawable, we used a selector named 'list_item_selector'.
Here's the selector, which uses the layer list drawable when not pressed, and uses a Holo-blue color when pressed:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="false"
android:drawable="#drawable/list_item_bg2"
/>
<item android:state_pressed="true"
android:drawable="#color/holo_blue"
/>
</selector>
EDIT for Comment
Absolutely possible, you can define a set height for list view items, however, it is recommended to set a minimum height, rather than a predefined height that never changes.
Say this is my list item layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="#+id/grid_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/grid_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:gravity="center_vertical"
android:layout_toRightOf="#+id/grid_image"
android:minHeight="48dp"
android:padding="8dp"
android:textIsSelectable="false" />
</RelativeLayout>
All needed would be,
Step One: Define the min height, or max height, as you prefer, in the dimens.xml file contained in the values/ folder. Why? Because the height should definitely change based on the layout, and you can define different dimens.xml for each device density.
in the dimens.xml, say:
<resources>
<!-- List Item Max and Min Height -->
<dimen name="list_item_min_height">48dp</dimen>
<dimen name="list_item_max_height">96dp</dimen>
<dimen name="list_item_set_height">64dp</dimen>
</resources>
And then use whichever value for the parent LinearLayout of you list item's layout.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="#dimen/list_item_min_height" >
And that's it for that topic, now to center the text, it's even simpler:
If you are using a TextView and is wrapped into a RelativeLayout, use: android:layout_centerVertical="true"
If you are using a LinearLayout, use: android:layout_gravity="center_vertical"
and couple that with: NOTE This only works if you didn't set the height to wrap_content, otherwise it is irrelevant.
android:gravity="center_vertical"
Hope that helps.

I don't know if I understand your question precisely.
If you want the divider to be transparent so you see a peace of the background between each ListView so it gives a kind of 3D effect when scrolling. You could do it this way:
In your list_item xml give the LinearLayout the background color you want for example:
<LinearLayout
android:id="#+id/listItem"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="4dip"
android:orientation="horizontal"
android:background="#FFFFFF"
>
Then give your ListView a background color like this:
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragmentListView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="#android:color/transparent"
android:dividerHeight="8dip"
android:background="#0000FF"
android:cacheColorHint="#android:color/transparent"
android:drawSelectorOnTop="true"
/>
Now your ListView scrolls over your background
I hope this is what you wanted.

Also one more way to increase the spacing between the list items is that you add an empty view to your adapter code by providing the layout_height attribute with the spacing you require. For e.g. in order to increase the bottom spacing between your list items add this dummy view(empty view) to the end of your list items.
<View
android:layout_width="match_parent"
android:layout_height="15dp"/>
So this will provide a bottom spacing of 15 dp between list view items. You can directly add this if the parent layout is LinearLayout and orientation is vertical or take appropriate steps for other layout. Hope this helps :-)

you can simply use divider
see the following example
<ListView
android:id="#+id/activity_main_listview_data"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:divider="#android:color/transparent"
android:dividerHeight="10dp"
/>
here, in android:divider you can set color or make it transparent and in dividerHeight for add spce between items.

This is a solution for those of you who do not want the divider to be visible and still want to add more space. To get rid of the divider completely, set it to #null and set the dividerHeight to 0dp. Here is a generic ListView of mines.
<ListView
android:id="#+id/myListView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff0000"
android:divider="#null"
android:dividerHeight="0dp"
android:layout_alignLeft="#+id/txtMake"
android:layout_below="#+id/txtMake"
android:fadeScrollbars="false"
android:scrollbarThumbVertical="#drawable/scroll_bar_color"
android:scrollbarStyle="outsideInset" >
</ListView>
Next, go to the xml file in which you use the adapter with to populate your listview. Go to your container (Example RelativeLayout...) and simply add in the following.
android:layout_marginTop="15dp"
This will actually add space for those of you who are not using the divider. Unlike the padding which just increases the box size, this will increase the distance between each item.

Inside the ListView tag in XMLfile add a dividerHeight tag and give it a value(the spacing you want between your list items).
It would provide you with suitable space between the list items.
Code:
<ListView
android:id="#+id/listid"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/transparent"
android:divider="#drawable/divi"
android:dividerHeight="60dp"></ListView>
Now create a drawable XML file (in this case name is divi). Inside it add a stroke tag and give it a width and that would do.
Code:
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="line">
<stroke
android:width="1dp"
android:color="#000000"
/>
</shape>

android:layout_width="match_parent"
android:textColor="#color/colorPrimary"
android:textSize="30dp"
android:layout_height="wrap_content"
Complete Code Here