Develop Reference

Background drawable not applying to button

I am trying to create a capsule/pill shaped button in XML. I have defined a drawable and set it as the background of my button, but in the preview, and when I run the app, it's displaying as a blue rectangle, despite the background drawable being a white oval. Does anyone know why that might be happening?
Here's the button:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/search_box"
android:layout_centerHorizontal="true"
android:layout_marginTop="24dp"
android:background="#drawable/button_capsule"
android:text="#string/search"
android:textColor="#color/precipLightBlue"/>
And here's the background drawable:
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="1000dp" />
<solid android:color="#android:color/white" />
</shape>

To have a capsule/pill shaped button you can use the MaterialButton in the official Material Component library using the app:cornerRadius attribute.
<com.google.android.material.button.MaterialButton
android:layout_width="100dp"
app:cornerRadius="32dp"
..../>
With the version 1.1.0 you can also customize the shape of your component using the app:shapeAppearanceOverlay attribute
<com.google.android.material.button.MaterialButton
....
app:shapeAppearanceOverlay="#style/ShapeAppearanceOverlay.ButtonRounded"
.../>
In the style define:
<style name="ShapeAppearanceOverlay.ButtonRounded" parent="">
<item name="cornerFamily">rounded</item>
<item name="cornerSize">32dp</item>
</style>
You can also try to use the ExtendedFloatingActionButton:
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
android:id="#+id/exfab"
android:layout_width="wrap_content"
.... />

You put a shape that you didn't defined. To define an oval you should put the shape="oval" option in the tag. Although i think you want a rectangle with rounded corners as i see in your code.
Also 1000dp radius is a lot, maybe that's making an issue.
Define size too. Because that shape doesn't have any size and may not appear as you are using wrap_content in the button definition
Try this:
<corners android:radius="30dp" />
<solid android:color="#android:color/white" />
<size
android:width="200dp"
android:height="50dp"/>
If you want an oval remove the corners tag and add android:shape="oval" as property of shape tag

Here is the code regarding button drawable background.
Xml code
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center|top"
android:background="#color/colorLightPurple">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="24dp"
android:background="#drawable/button_bg"
android:text="Search"
android:textColor="#color/colorBlue"/>
</LinearLayout>
For button background , please add same drawable file

seems like you're doing everything right. Just a small addition, try adding android:shape="rectangle" in the shape tag.
This is what button_capsule.xml should look like.
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="1000dp" />
<solid android:color="#android:color/white" />
</shape>
Hope this works. All the best.

In Material design version 1.2.0 they have fixed this issue and added a property for setting background for Material Button
here is the dependency for the latest version
com.google.android.material:material:1.2.0
and also if u want to remove the space between the drawable top and bottom so that the drawable get the whole width and height use these 2 properties
android:insetTop="0dp"
android:insetBottom="0dp"
if want to explore more about the properties u can refer to the release of library and can check all the properties.
https://github.com/material-components/material-components-android/releases/tag/1.2.0

use this.
<androidx.appcompat.widget.AppCompatButton
.....
/>

Show a view with a hole

I'm trying to create a view as tutorial for my activity. I need to show only some text with a translucent background an leave a "hole" transparent to see the background button of the original activity. I can use a framelayout with two different sub-layout (the original one and the tutorial one) and I can set visible/invisible the tutorial layout. The problem is: I don't know how I can create a "hole" in the tutorial sub-layout. How can I do?

background colors should transparent, opaque
I hope, it will work for you.
circle_background.xml file
<shape
android:shape="ring"
android:useLevel="true"
xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/blue_pressed" />
</shape>
view_background.xml
<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:background="#drawable/circle_background"
>
//add more views if u wanto
</LinearLayout>

For create a "hole" or circular view you need create a drawable
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="#android:color/transparent" />
</shape>
And create a imageview in the position and size that you want and set this drawable like background.
Also you can use #00000000 intead #android:color/transparent
Or use TutorialView library on github

Custom RelativeLayout to have circular boundary

I have a requirement to show a View which need to have a circular boundary.
I know it can be done by Extending the RelativeLayout. But exactly dont know what all methods to override except constructors and what code changes I have to make for it to show circular boundary.
Updated question with Image.
So basically this is an animation.
and minutely the view goes out from screen from the circumference of the circle (And not as rectangular view).
So I have to create a circular view (Relative Layout) that is having child of these images.

Use android.support.v7.cardview and put a RelativeLayout as its child.
https://developer.android.com/reference/android/support/v7/widget/CardView.html
Note from the above link:
Due to expensive nature of rounded corner clipping, on platforms
before L, CardView does not clip its children that intersect with
rounded corners. Instead, it adds padding to avoid such intersection
(See setPreventCornerOverlap(boolean) to change this behavior).

i think you need to make any layout with rounded border. using below code for make layout rounded.
round.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item><shape>
<solid android:color="#color/list_row_bg" />
<corners android:bottomLeftRadius="4dp"
android:bottomRightRadius="4dp"
android:topLeftRadius="4dp"
android:topRightRadius="4dp" />
<stroke android:width="1dp" android:color="#color/header_bg" />
</shape></item>
</selector>
put this round.xml file drawable folder. and use as backgournd in your layout.
my_layout.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"
android:orientation="vertical"
android:padding="25dp" >
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/round" />
</LinearLayout>

android potential bug in edittext?

I am not sure if I have a bug inside my head ,or it is inside the android's EditText .
I have a simple EditText .
<EditText
android:id="#+id/name_value"
android:layout_width="0dp"
android:layout_height="#dimen/feedback_form_comment_box"
android:layout_weight="6"
android:background="#drawable/black_border"
android:padding="#dimen/feedback_form_padding" />
When I run this , I see a normal edittext with a shapedrawable (just a black border) on the screen. Perfect.
I need to set the gravity now . Because the cursor starts in the middle of the text area. I want the cursor to be displayed in the start of the edittext. So I set the gravity like this .
<EditText
android:id="#+id/name_value"
android:layout_width="0dp"
android:layout_height="#dimen/feedback_form_comment_box"
android:layout_weight="6"
android:gravity="top|left"
android:background="#drawable/black_border"
android:padding="#dimen/feedback_form_padding" />
Now mysteriously , the bottom border of the edittext goes away .
This is the shape drawable I am using .
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<!-- Solid will define the color of our shape's body -->
<solid android:color="#color/white" />
<!-- Stroke will define the border of our shape-->
<stroke
android:width="1dp"
android:color="#color/black" />
</shape>
What's going on?

bro!
i also come across such a question. It happens on some android pad devices.
After a long test, i find that it was the padding of textview which caused this. Not only the shape drawable but also img background will cause this.
A better way is to set padding for textview manually.
If have time,i will continue to check the source code for what have cause this.

How to cut borders of the child layout?

I have LinearLayout with shape background and WebView inside. How to cut WebView along the border of the shape?
I want WebView fit in the shape and so WebView will not have any acute angles.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="5dip" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/bg_border"
android:orientation="vertical" >
<WebView android:id="#+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
</LinearLayout>
bg_border.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke
android:width="1dp"
android:height="1dp"
android:color="#color/border" />
<corners
android:radius="5dp"
android:bottomRightRadius="5dp"
android:bottomLeftRadius="5dp"
android:topLeftRadius="5dp"
android:topRightRadius="5dp" />

I would bet you can only simulate that. Create another shape with a (smaller) radius, and make it white. Put that around your web view. This obviously won't work if the page you're looking at is not white.
Also, you don't need to define topLeft/bottomRight/etc if you already define "radius" and all the values are the same.
UPDATE
Ideas. Both of them involve a source image LIKE this: http://www.noiseindustries.com/downloads/misc/FxFactoryHelp/pluginguide/generators/roundedrectangle/files/ni-rounded-rectangle.jpg
Just make sure the border is MUCH smaller. 3-5 pixels. The white center should be transparent, not white.
1) Create a RelativeLayout, and create images for the sides and corners. With the layout and images, basically lay out the images so you "draw" a border. Don't put anything in the center. Create a FrameLayout, put the webview in, then put the RelativeLayout on top. Hopefully, the touch events in the center will fall through to the webview, but still give you a soft border around the edges.
2) Create a 9-patch image that basically looks the same as the border described in 1. Do the same FrameLayout described in 1, and add the Webview. On top of that, add a CUSTOM view. Set the background to the 9-patch, and make sure the custom view passes on all of its touch events.
I suspect #1 would be easier to implement, but who knows?