Develop Reference

SwitchCompat RTL support

Seems like selector file for track attribute is not working properly for RTL.
LTR track and thumb.
RTL track and thumb. Here thumb is changed properly, but track images are still unchanged as it should display map icon on the right.
<androidx.appcompat.widget.SwitchCompat
android:background="#drawable/selector_switch_track"
android:elevation="6dp"
android:outlineProvider="background"
android:thumb="#drawable/selector_switch_thumb"
app:track="#drawable/selector_switch_track" />
selector_switch_track.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" android:autoMirrored="true">
<item android:state_checked="true">
<layer-list>
<item>
<shape android:shape="rectangle">
<solid android:color="#color/global_white" />
<corners android:radius="#dimen/margin_100dp" />
</shape>
</item>
<item android:drawable="#drawable/layer_switch_thumb_map_off" android:gravity="start" android:right="#dimen/margin_56dp" />
<item android:drawable="#drawable/layer_switch_thumb_list_off" android:gravity="end" android:left="#dimen/margin_56dp" />
</layer-list>
</item>
<item android:state_checked="false">
<layer-list>
<item>
<shape android:shape="rectangle">
<solid android:color="#color/global_white" />
<corners android:radius="#dimen/margin_100dp" />
</shape>
</item>
<item android:drawable="#drawable/layer_switch_thumb_map_off" android:gravity="start" android:right="#dimen/margin_56dp" />
<item android:drawable="#drawable/layer_switch_thumb_list_off" android:gravity="end" android:left="#dimen/margin_56dp" />
</layer-list>
</item>
</selector>

I solved this issue by creating seperate res dir drawable-ldrtl for RTL and put there same selector file but with switched start/end drawables.

How to design EditText and Button in Android

How can I design my EditText and Button like in the Instagram application? I understand that I would need to do this by using Drawable files but every link I have found only shows how to design using Gradients which looks horrible. I just want something simple but not sure where to start.

All you need to do is create a Button or Edittext or TextView with transparent background and colored border like:
activity code :
<?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"
android:background="#color/colorpink">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Transparent Button with blue border"
android:id="#+id/button"
android:padding="10dp"
android:layout_gravity="center_horizontal"
android:background="#drawable/transparent_button_selector"
android:textColor="#color/colorPrimary"
android:textAllCaps="false"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
transparent_button_selector.xml :
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- pressed state -->
<item android:state_pressed="true"><shape>
<solid android:color="#android:color/transparent" />
<stroke android:width="2dp" android:color="#color/colorPrimary" />
<corners android:radius="22dp" />
</shape></item>
<!-- focused state -->
<item android:state_focused="true"><shape>
<solid android:color="#android:color/transparent" />
<stroke android:width="2dp" android:color="#color/colorPrimary" />
<corners android:radius="22dp" />
</shape></item>
<!-- normal state -->
<item><shape>
<solid android:color="#android:color/transparent"/>
<stroke android:width="2dp" android:color="#color/colorPrimary" />
<corners android:radius="22dp" />
</shape></item>
</selector>
colors :
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
<color name="colorpink">#AAFF4081</color>
And its looking like :
You can change transparent_button_selector.xml , change colors, radius values, borders and try to create your layout firstly and then think about background. Yes i will say gradient too . There is one question here for it : changing-gradient-background-colors-on-android-at-runtime
Also you can play with backgorund color, if you use few transparent white like #33FFFFFF then the result will be like : http://imgur.com/poGN2nn

It looks like they are using a single gradient drawable for the background of the login layout and then the EditTexts have a mostly-transparent white background and the Button has a fully transparent background. To round the corners of the EditText/Button, set the background to a drawable that looks something like this:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#android:color/transparent"/>
<corners
android:bottomRightRadius="2dp"
android:bottomLeftRadius="2dp"
android:topLeftRadius="2dp"
android:topRightRadius="2dp"/>
</shape>

may be this code can help you. This is the activity.xml file. use TextView as Button.
<?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:background="#FF929999">
<EditText
android:id="#+id/userName"
android:layout_width="fill_parent"
android:layout_height="48.0dip"
android:layout_marginBottom="16.0dip"
android:background="#drawable/input_field"
android:hint="username"
android:inputType="textNoSuggestions"
android:paddingLeft="16.0dip"
android:paddingRight="16.0dip"
android:singleLine="true"
android:textColor="#color/white"
android:textColorHint="#b3ffffff"
android:textCursorDrawable="#null"/>
<TextView
android:id="#+id/saveButton"
android:layout_width="match_parent"
android:layout_height="48.0dip"
android:background="#drawable/button_border"
android:gravity="center"
android:text="Save"
android:textColor="#ccffffff"
android:textSize="16sp"
android:textStyle="bold"/>
</LinearLayout>
input_field.xml file should look like this:
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#1affffff"/>
<corners android:radius="2.0dip"/>
</shape>
And button_border.xml will be like this:
<?xml version="1.0" encoding="utf-8"?>
<selector
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape android:shape="rectangle">
<solid android:color="#1affffff"/>
<stroke
android:width="1.0dip"
android:color="#80ffffff"/>
<corners android:radius="2.0dip"/>
</shape>
</item>
<item>
<shape android:shape="rectangle">
<solid android:color="#00000000"/>
<stroke
android:width="1.0dip"
android:color="#33ffffff"/>
<corners android:radius="2.0dip"/>
</shape>
</item>
enjoy the design.

Use Drawable with border and transparent color for EditText and Button, and the entire violet background is image, not gradient drawable. And also use TransitionDrawable for transitioning between two drawables like Instagram.

How to create custom spinner like border around the spinner with down triangle on the right side?

I want to develop custom spinner like line around spinner with triangle at right bottom corner.
like following image
For above fig I wrote my custom spinner like a
spinner.xml
<Spinner android:background="#drawable/spinner_background"/>
spinner_background.xml
<?xml version="1.0" encoding="UTF-8"?>
<item android:state_pressed="true"
android:drawable="#drawable/spinner_ab_pressed_new_theme_bs">
<shape>
<solid
android:color="#color/White" />
<corners android:radius="3dp" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<stroke
android:width="2dp"
android:color="#color/skyblue" />
</shape>
</item>
<!-- spinner_ab_default_new_theme_bs -> this image for corner triangle -->
<item
android:drawable="#drawable/spinner_ab_default_new_theme_bs" >
<shape>
<solid
android:color="#color/White">
</solid>
<corners android:radius="3dp" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<stroke
android:width="2dp"
android:color="#color/gray"/>
</shape>
</item>
And I got output like following image
I tried lot but not achieve my goal please anybody have solution to develop spinner.
like above first one image.

Spinner
<Spinner
android:id="#+id/To_Units"
style="#style/spinner_style" />
style.xml
<style name="spinner_style">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:background">#drawable/gradient_spinner</item>
<item name="android:layout_margin">10dp</item>
<item name="android:paddingLeft">8dp</item>
<item name="android:paddingRight">20dp</item>
<item name="android:paddingTop">5dp</item>
<item name="android:paddingBottom">5dp</item>
<item name="android:popupBackground">#DFFFFFFF</item>
</style>
gradient_spinner.xml (in drawable folder)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item><layer-list>
<item><shape>
<gradient android:angle="90" android:endColor="#B3BBCC" android:startColor="#E8EBEF" android:type="linear" />
<stroke android:width="1dp" android:color="#000000" />
<corners android:radius="4dp" />
<padding android:bottom="3dp" android:left="3dp" android:right="3dp" android:top="3dp" />
</shape></item>
<item ><bitmap android:gravity="bottom|right" android:src="#drawable/spinner_arrow" />
</item>
</layer-list></item>
</selector>
#drawable/spinner_arrow is your bottom right corner image

This is a simple one.
your_layout.xml
<android.support.v7.widget.AppCompatSpinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/spinner_background"
/>
In the drawable folder, spinner_background.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item><layer-list>
<item>
<shape>
<solid
android:color="#color/colorWhite">
</solid>
<corners android:radius="3dp" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<stroke
android:width="2dp"
android:color="#color/colorDarkGrey"/>
</shape>
</item>
<item >
<bitmap android:gravity="bottom|right"
android:src="#drawable/ic_arrow_drop_down_black_24dp" />
</item>
</layer-list></item>
</selector>
Preview:

You can achieve the following by using a single line in your spinner declaration in XML:
Just add this: style="#android:style/Widget.Holo.Light.Spinner"
This is a default generated style in android. It doesn't contain borders around it though. For that you'd better search something on google.
Hope this helps.
UPDATE:
AFter a lot of digging I got something which works well for introducing border around spinner.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:bottom="8dp"
android:top="8dp">
<shape>
<solid android:color="#android:color/white" />
<corners android:radius="4dp" />
<stroke
android:width="2dp"
android:color="#9E9E9E" />
<padding
android:bottom="16dp"
android:left="8dp"
android:right="16dp"
android:top="16dp" />
</shape>
</item>
</layer-list>
Place this in the drawable folder and use it as a background for spinner. Like this:
<RelativeLayout
android:id="#+id/speaker_relative_layout"
android:layout_width="0dp"
android:layout_height="70dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:background="#drawable/spinner_style"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent">
<Spinner
android:id="#+id/select_speaker_spinner"
style="#style/Widget.AppCompat.DropDownItem.Spinner"
android:layout_width="match_parent"
android:layout_height="70dp"
android:entries="#array/select_speaker_spinner_array"
android:spinnerMode="dialog" />
</RelativeLayout>

If you don't prefer to create multiple XML files, try:
<com.google.android.material.card.MaterialCardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:strokeWidth="1dp"
app:strokeColor="#color/black"
app:cardCornerRadius="4dp">
<androidx.appcompat.widget.AppCompatSpinner
android:id="#+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"/>
</com.google.android.material.card.MaterialCardView>
To change the border color:
app:strokeColor="YOUR_COLOR_HERE"
To change the border's width:
app:strokeWidth="YOUR_DP_WIDTH_HERE"

There are two ways to achieve this.
1- As already proposed u can set the background of your spinner as custom 9 patch Image with all the adjustments made into it .
android:background="#drawable/btn_dropdown"
android:clickable="true"
android:dropDownVerticalOffset="-10dip"
android:dropDownHorizontalOffset="0dip"
android:gravity="center"
If you want your Spinner to show With various different background colors i would recommend making the drop down image transparent, & loading that spinner in a relative layout with your color set in.
btn _dropdown is as:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_window_focused="false" android:state_enabled="true"
android:drawable="#drawable/spinner_default" />
<item
android:state_window_focused="false" android:state_enabled="false"
android:drawable="#drawable/spinner_default" />
<item
android:state_pressed="true"
android:drawable="#drawable/spinner_pressed" />
<item
android:state_focused="true" android:state_enabled="true"
android:drawable="#drawable/spinner_pressed" />
<item
android:state_enabled="true"
android:drawable="#drawable/spinner_default" />
<item
android:state_focused="true"
android:drawable="#drawable/spinner_pressed" />
<item
android:drawable="#drawable/spinner_default" />
</selector>
where the various states of pngwould define your various States of spinner seleti

To change only "background" (add corners, change color, ....) you can put it into FrameLayout with wanted background drawable, else you need to make nine patch background for to not lose spinner arrow. Spinner background is transparent.

You could design a simple nine-patch png image and use it as the background of spinner. Using GIMP you can put both border and right triangle in image.

It's super easy you can just add this to your Adapter -> getDropDownView
getDropDownView:
convertView.setBackground(getContext().getResources().getDrawable(R.drawable.bg_spinner_dropdown));
bg_spinner_dropdown:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#color/white" />
<corners
android:bottomLeftRadius=enter code here"25dp"
android:bottomRightRadius="25dp"
android:topLeftRadius="25dp"
android:topRightRadius="25dp" />
</shape>

How do I add a 1dp line to the bottom of my textview cell ( not a table layout)

I am new to android, jsut a very plain simple question, how do i add a bottom line to a text view, so that it appears at the bottom of the cell as 1dp, here's the code so far:
<?xml version="1.0" encoding="UTF-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="47.5dp"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:paddingTop="13dp"
android:background="#drawable/line_str"
android:paddingLeft="8dp"
android:text="#string/manage_categories"
android:singleLine="true"
android:textColor="#color/white"
android:fontFamily="Roboto-Regular"
android:layout_gravity="center"
android:textSize="16sp"
/>
line_str.xml as follows:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- This is the main color -->
<item>
<shape>
<solid android:color="#color/black" />
</shape>
</item>
<!-- This is the line -->
<item android:bottom="1dp">
<shape>
<solid android:color="#252525" />
</shape>
</item>
</layer-list>
Any help appreciated. Thanks!

I'd put a horizontally expanding 9patch image and add it to drawableBottom property of the textview.
As for the layer-list approach try this:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- This is the main color -->
<item>
<shape>
<size android:height="#dimen/textViewHeight"/>
<solid android:color="#color/black" />
</shape>
</item>
<!-- This is the line -->
<item android:top="#dimen/textViewHeight">
<shape>
<size android:height="1dp"/>
<solid android:color="#252525" />
</shape>
</item>
</layer-list>

Edit text with round corner and shadow

I am trying to achieve the effect which is shown in this following image:
In this image there is an edittext with round corner and internal shadow at top. I tried a lot but not success in getting shadow inside edittext.
I searched on this topic but all examples show shadow outside edittext border. I have no idea how can I achieve this.
The button and background image is already done, The only thing which is left is edittext shadow. If someone has already done this or know how to do this please share with me. Any help whould be appreciated.

Got like this
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:centerY="0.2"
android:startColor="#FFBDBDBD"
android:centerColor="#65FFFFFF"
android:endColor="#00FFFFFF"
android:angle="270"
/>
<stroke
android:width="1dp"
android:color="#C3C3C3" />
<corners
android:radius="25dp" />
</shape>

Just create an xml file in your drawable folder name as round_corner.xml.And add this following code.
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<corners
android:radius="3dp"
/>
<solid
android:color="#android:color/white"/>
</shape>
At Last you add this xml in background property of your Edittext as follows:-
<EditText
android:id="#+id/ed1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/round_corner"
/>
Done..Definitely it works..

1.) Create rounded_edittext.xml file in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" android:padding="15dp">
<solid android:color="#FFFFFF"/>
<corners
android:bottomRightRadius="5dp"
android:bottomLeftRadius="5dp"
android:topLeftRadius="5dp"
android:topRightRadius="5dp"/>
<stroke android:width="1dip" android:color="#FF0000" />
</shape>
2.) Put below code in styles.xml file placed in values folder
<style name="largeEdittextText">
<item name="android:textAppearance">#android:style/TextAppearance.Large.Inverse</item>
<item name="android:textSize">15dp</item>
<item name="android:singleLine">true</item>
<item name="android:paddingTop">8dp</item>
<item name="android:paddingBottom">8dp</item>
<item name="android:paddingLeft">5dp</item>
<item name="android:background">#FFB90F</item>
<item name="android:textColor">#android:color/black</item>
</style>
3.) Apply both on edittext in layout file
<EditText
android:id="#+id/userName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:gravity="center_horizontal"
android:hint="#string/login_userHint"
android:text="admin"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:singleLine="true"
android:textAppearance="#style/largeEdittextText"
android:background="#drawable/rounded_edittext">
</EditText>

if you want to make the border of EditText Round and curve, then just paste this code in Drawable/mystyle.xml (create this xml file) .
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:thickness="0dp"
android:shape="rectangle">
<stroke android:width="1dp"
android:color="#c8c8c8"/>
<corners android:radius="11dp" />
</shape>
Now in your EditText link this file as
android:background="#+drawable/mystyle"