How to make custom button android

Android Custom Button With Centered Progress Indicator

Recently, I’ve got a simple task in a project I am working on.
I had to create a designed button with a centered progress indicator inside of it.

The button should have 3 states:

In Enabled state, it should show text while in Loading state it should show a Circular Progress Indicator (which can be native or any custom view such as Lottie animation view) and in Disabled state it should show text but grayed out.

Here is the final look according to the design!

What sounds like a simple task turned out to be not so straight forward and easy to do!
As I’ve looked for a way of how I can implement such view, I thought that I will just create a custom view that extends some Android Button class, but if you will look on the Button classes you will (or not) be surprised that those actually extends nothing else but a TextView!!
So how I can extend a View class and then add and manipulate additional Views on it?
And also, the biggest part of this of course is the styling and theming!

After all, I want to make my custom buttons to be reusable, easy to use and with different styles like rounded corners, ripple effect and any color.

When I realised that extending Button is not an option, I thought that extending a ViewGroup like a RelativeLayout or ConstraintLayout will be much better. A ViewGroup has child views inside of it, they can be manipulated and it’s easy to change their visibility and state.
I thought, if a TextView can behave as a button then then so a ViewGroup can, it’s all matter of styling and theming.
Finally I’ve chosen RelativeLayout, I like it, it’s simple and easy to work with.

First Layout First

I’ve started with designing my custom button layout, which looks like this:

As you can see, its just a simple RelativeLayout with a centered TextView and for the progress indicator I’ve chosen to use LottieAnimationView.

One important thing here, you may look on line 13 in the XML, the TextView android: textAppearance attribute which set to be
“?android:attr/textAppearanceButton”, this attribute is the one that sets buttons default text appearance right from the app theme! If we will override it in our app theme, it will effect this TextView here. We will see this further down in the styling and theming part of this article.

Show Me The Code

Now that we have the layout ready, its time to see the code that it is associated with:

Let’s go over the code and see all about it, and that is so simple.

1. First, notice as I mentioned that the ProgressButton class extends RelativeLayout
2. On lines 10–14 the init block, first, inflating the layout and then on lines 12–13 initialising the childs views using findViewById
3. Next, on line 14, calling the loadAttr() method for getting styleables attributes for the button initial state! I’ve defined a few styleables so they can be set in the custom view xml. The attributes are:

• text — Setting the button text
• loading — For setting initial loading state from xml
• enabled — For setting initial enabled/disabled state
• lottieResId — For setting any lottie animation resource from xml

4. On lines 30–34, applying the initial values to the child views, and also setting the whole view enable state. Later, this enable state will change the appearance thanks to a style and selector background drawable.

Next, on lines 37–46, setLoading method for changing the button loading states! When it is loading, the TextView is GONE and the progressBar is VISIBLE, when its not loading, the TextView is VISIBLE and the progressBar is GONE.
Notice also that when it is in loading state I am setting it so it will be not clickable.

On lines 48, a method for setting the text in code, for any purposes.

Last but not the leaset, on lines 52–55 overriding the setEnabled method for setting the whole view (The parent RelativeLayout) enable state and also the enable state of the TextView, this is important as you may want to have different text colors when the button is disabled.
Thanks to the “?android:attr/textAppearanceButton” attribute I’ve mentioned earlier, we can have any text styling for different states. I will show all styling in the next sections.

Do It With Style

After complete with layout and code, all we have to do now is connect a set of styling and theming. This part is a little bit tricky, but here is how I’ve managed it.
BTW, I really encourage you to go over this article, which explains how text appearance, theming and styling works in Android

Define a Theme in style.xml

The above xml defines two attributes which will be applied as a theme to the button custom view.
As we mentioned earlier, the textAppearanceButton attribute will effect the text that is in the TextView that in the button layout.

Next, the colorControlHighlight attribute will effect the view ripple effect when clicked. This is also an attribute that comes from the app theme which we override just for this custom view.

The textAppearance styling:

In the above xml we set the text appearance, first we define a base TextAppearance.Body.White block with the font family, text style, size and the base color.
Next, a specific TextAppearance.ProgressButton.Black block for the black button, this block inherit from the base block but overrides the android:textColor attribute, as the text color should be different when it is disabled so I defined a selector for it.

Last but not the least, the selector for the black button text color, with different color for disabled state.

What Is Your Background?

Of course, any view should have a background right?
So is our nice little custom button, the way we do it is by defining some drawable with shape and selector just we do in any other view!

First, lets define the background drawable:

Notice that the ripple color attribute is colorControlHighligh, thats right! We’ve override it in our theme! Cool!
Now, we need to define the shape and the selector:

The above three xml’s completes the view background!!

Now that we have a theme and background ready we should combine them both together! This will be done in another style block:

Notice that in the above style xml, we defined an “android:theme” attribute and gave it the theme that has been defined earlier. This will apply that theme to the view.
Next, we’ve set the “android:background” attribute with the drawable which includes the shape and the selector!

For any new color or shape, we will have to create a bunch of styling xml as described above! But when using it we should take only the last style block which combine both the theme and the background. You may look in the example in the next section!

Thats it!! Everything is ready for use!

I’ve Built It! I Want To Use It!!

All right! This is it! It’s time to use our nice little button in a Fragment or Activity. First, let’s put it in a layout!

Using the new ProgressButton is simple as just putting it in a layout and just set the style for the preferred color!

Now in our Fragment, we can use binding to access it and use it!

Summary

As you may see, such a simple looking task requires some effort to implement in the traditionally Android and View native framework. I wonder if maybe Jetpack Compose will bring new possibilities for making Android UI manipulation much easy with the ideas of Widgets and composition!

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How to create customized Buttons in Android with different shapes and colors

A Button is a user interface that are used to perform some action when clicked or tapped.

Default Shape of Button

In this article, we will try to change the shape and color of Button to various designs, like:

• Oval Button
• Rectangular Button
• Cylindrical Button

Approach:

Below are the various steps to created customized Buttons:
Step 1: Start a new Android Studio project
Please refer to this article to see in detail about how to create a new Android Studio project.

Step 2: Add the Button
Since we only need to customize Buttons, we will just add Buttons in our layout. We don’t need any other widget. This can be done either by writing the code in XML or using the Design Tab. Here, we will do so by adding its XML code.

Now since we need to customize the Button as per 3 shapes (as shown above), we will add 3 buttons and add the customization of each separately, lets say the buttons be – oval, rectangle and cylindrical.

activity_main.xml

Initially, all three buttons have default values and will look as per the default look shown above.

Step 3: Customizing the button
In order to customize the button, as shown above, we will be needing few attributes of Button in particular:

1. shape: This defines the shape of the widget that is being used. For example: oval, rectangle, etc.
2. color This attribute takes the Hexadecimal color code as parameter and sets the color as per the code
3. corner::radius: This attribute defines how much curved corners of the button has to be. For example, no curve will lead to rectangle and increasing the curve can result in circle as well.
4. stroke: This attribute refers to the thickness of the outline of the button. The more the stroke, the thicker the outline will be.

These attributes can be set for a widget with the help of a Drawable resource file.

Creating a new drawable resource file:

We will be creating a new drawable file which will contain the customizations such as shape, color, and gradient which we want to set on our button. To create a drawable file, click on: app -> res -> drawable(right click) -> New -> Drawable resource file and name it anything you want.

Adding code to the resource file:

Now that we have this drawable resource file, we can customize our button by adding tags like shape, color, stroke, or any other attribute which we want.

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Buttons

A button consists of text or an icon (or both text and an icon) that communicates what action occurs when the user touches it.

Depending on whether you want a button with text, an icon, or both, you can create the button in your layout in three ways:

• With text, using the Button class:
• With an icon, using the ImageButton class:
• With text and an icon, using the Button class with the android:drawableLeft attribute:

Key classes are the following:

Responding to Click Events

When the user clicks a button, the Button object receives an on-click event.

To define the click event handler for a button, add the android:onClick attribute to the element in your XML layout. The value for this attribute must be the name of the method you want to call in response to a click event. The Activity hosting the layout must then implement the corresponding method.

For example, here’s a layout with a button using android:onClick :

Within the Activity that hosts this layout, the following method handles the click event:

Kotlin

The method you declare in the android:onClick attribute must have a signature exactly as shown above. Specifically, the method must:

• Be public
• Return void
• Define a View as its only parameter (this will be the View that was clicked)

Using an OnClickListener

You can also declare the click event handler programmatically rather than in an XML layout. This might be necessary if you instantiate the Button at runtime or you need to declare the click behavior in a Fragment subclass.

To declare the event handler programmatically, create an View.OnClickListener object and assign it to the button by calling setOnClickListener(View.OnClickListener) . For example:

Kotlin

Styling Your Button

The appearance of your button (background image and font) may vary from one device to another, because devices by different manufacturers often have different default styles for input controls.

You can control exactly how your controls are styled using a theme that you apply to your entire application. For instance, to ensure that all devices running Android 4.0 and higher use the Holo theme in your app, declare android:theme=»@android:style/Theme.Holo» in your manifest’s element. Also read the blog post, Holo Everywhere for information about using the Holo theme while supporting older devices.

To customize individual buttons with a different background, specify the android:background attribute with a drawable or color resource. Alternatively, you can apply a style for the button, which works in a manner similar to HTML styles to define multiple style properties such as the background, font, size, and others. For more information about applying styles, see Styles and Themes.

Borderless button

One design that can be useful is a «borderless» button. Borderless buttons resemble basic buttons except that they have no borders or background but still change appearance during different states, such as when clicked.

To create a borderless button, apply the borderlessButtonStyle style to the button. For example:

Custom background

If you want to truly redefine the appearance of your button, you can specify a custom background. Instead of supplying a simple bitmap or color, however, your background should be a state list resource that changes appearance depending on the button’s current state.

You can define the state list in an XML file that defines three different images or colors to use for the different button states.

To create a state list drawable for your button background:

Create three bitmaps for the button background that represent the default, pressed, and focused button states.

To ensure that your images fit buttons of various sizes, create the bitmaps as Nine-patch bitmaps.

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