Android Passcode Keypad View 
A custom view with keyboard and character display to be used for authentication.
The view has a bunch customisation options to make to look and work the way whichever needed.
Demo
Installation
Add gradle dependency
repositories {
jcenter()
}
dependencies {
compile 'in.arjsna:passcodeview:1.2.1'
}
Usage
Add the view in the layout file
<in.arjsna.lib.PassCodeView
android:id="@+id/pass_code_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:digits="4"
app:digit_size="30.0dp"
app:key_text_size="30.0sp"
android:padding="25.0dp"
app:empty_drawable="@drawable/empty_dot"
app:filled_drawable="@drawable/filled_dot"/>
View attributes that can be included in xml are
digits - number of digits in passcode
filled_drawable - drawable to be show for filled digits
empty_drawable - drawable to be show for empty digits
key_text_size - size of text in keyboard's key
digit_spacing - horizontal space between each digit
digit_vertical_padding - vertical padding of digits
divider_visible - boolean to show or hide divider between digits and keyboard
Other customisations options available are
PassCodeView passCodeView = (PassCodeView) findViewById(R.id.pass_code_view);
Typeface typeFace = Typeface.createFromAsset(getAssets(), "fonts/Font-Bold.ttf");
/**
*Set TypeFace for the font in keys of keypad
*/
passCodeView.setTypeFace(typeFace);
/**
* Set color for the keypad text
* @param color - Resource id of the color to be set
*/
passCodeView.setKeyTextColor(getResources.getColor(R.color.black));
/**
* Set size of keypad text
* @param size - Text size value to be set
*/
passCodeView.setKeyTextSize(30);
/**
* Set passcode digit lenght
* @param length - digit length to be set
*/
passCodeView.setDigitLength(6);
/**
* Set current passcode text
* @param code - {@code String} passcode string to be set
*/
public void setPassCode("8854")
/**
* Reset the code to empty
*/
passCodeView.reset();
/**
* Set drawable for empty digits programmatically
*/
passCodeView.setEmptyDrawable(R.drawable.empty);
/**
* Set drawable for filled digits programmatically
*/
passCodeView.setFilledDrawable(R.drawable.filled);
/**
* Attach {@code TextChangeListener} to get notified on text changes
* @param listener - {@Code TextChangeListener} object to be attached and notified
*/
passCodeView.setOnTextChangeListener(new PassCodeView.TextChangeListener() {
@Override
public void onTextChanged(String text) {
Log.i("Passcode", "text");
}
});