LoadingButton in Android

A LoadingButton typically indicates a process is occurring after a user action, and the UI gives feedback about this process. While there isn't a default LoadingButton component in the Android SDK, it's fairly easy to create one. Here's a guide on how you can create a basic LoadingButton using a Button and a ProgressBar.

1. Define the LoadingButton Layout:

In the layout XML, you can combine a Button and a ProgressBar within a FrameLayout:

<FrameLayout
    android:id="@+id/loadingButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:focusable="true">

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Submit" />

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone" />

</FrameLayout>

2. Handle Loading State in Your Activity or Fragment:

In your Kotlin code, you can toggle between the loading state and the default state:

val loadingButton = findViewById<FrameLayout>(R.id.loadingButton)
val button = findViewById<Button>(R.id.button)
val progressBar = findViewById<ProgressBar>(R.id.progressBar)

loadingButton.setOnClickListener {
    // Perform your asynchronous task here (e.g., network request)
    showLoading(true)

    // For demonstration, simulate a delay and then revert to the default state
    Handler(Looper.getMainLooper()).postDelayed({
        showLoading(false)
    }, 3000)
}

fun showLoading(isLoading: Boolean) {
    if (isLoading) {
        button.visibility = View.INVISIBLE
        progressBar.visibility = View.VISIBLE
        loadingButton.isClickable = false
    } else {
        button.visibility = View.VISIBLE
        progressBar.visibility = View.GONE
        loadingButton.isClickable = true
    }
}

This setup makes the Button invisible and shows the ProgressBar while loading. Once the loading completes, the Button becomes visible again, and the ProgressBar disappears.

You can further enhance this by adding animations, custom backgrounds, or other UI enhancements to match your app's theme and user experience requirements. There are also third-party libraries available that offer more advanced loading buttons with extended features, so depending on your needs, you might want to explore those as well.

Implementing loading state in Android button:

To implement a loading state in an Android button, you can use a combination of ProgressBar and Button. Toggle their visibility based on the loading state.

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <Button
        android:id="@+id/loadingButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Click Me" />

    <ProgressBar
        android:id="@+id/loadingProgressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:visibility="invisible" />
</RelativeLayout>

Button loadingButton = findViewById(R.id.loadingButton);
ProgressBar loadingProgressBar = findViewById(R.id.loadingProgressBar);

// Set OnClickListener to handle button click and show loading state
loadingButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // Show loading state
        loadingButton.setEnabled(false);
        loadingProgressBar.setVisibility(View.VISIBLE);

        // Perform asynchronous task

        // Hide loading state
        loadingButton.setEnabled(true);
        loadingProgressBar.setVisibility(View.INVISIBLE);
    }
});

Creating a progress button in Android with example code:

Create a custom button that extends AppCompatButton and includes a ProgressBar. Toggle their visibility to represent the loading state.

public class ProgressButton extends AppCompatButton {

    private ProgressBar progressBar;

    public ProgressButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        progressBar = new ProgressBar(getContext(), null, android.R.attr.progressBarStyleSmall);
        // Set ProgressBar attributes and add it to the layout
        // ...

        // Set OnClickListener to handle button click and show loading state
        setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Show loading state
                setEnabled(false);
                progressBar.setVisibility(View.VISIBLE);

                // Perform asynchronous task

                // Hide loading state
                setEnabled(true);
                progressBar.setVisibility(View.INVISIBLE);
            }
        });
    }
}

Custom LoadingButton implementation in Android:

Create a custom LoadingButton class that encapsulates the loading state logic. This can extend AppCompatButton and handle loading state internally.

public class LoadingButton extends AppCompatButton {

    private ProgressBar progressBar;

    public LoadingButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        progressBar = new ProgressBar(getContext(), null, android.R.attr.progressBarStyleSmall);
        // Set ProgressBar attributes and add it to the layout
        // ...

        // Set OnClickListener to handle button click and show loading state
        setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showLoadingState();

                // Perform asynchronous task

                hideLoadingState();
            }
        });
    }

    private void showLoadingState() {
        setEnabled(false);
        progressBar.setVisibility(View.VISIBLE);
    }

    private void hideLoadingState() {
        setEnabled(true);
        progressBar.setVisibility(View.INVISIBLE);
    }
}

Loading animation for buttons in Android app development:

Use animations to create loading effects for buttons. For example, you can rotate a ProgressBar or use custom animations.

<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:toDegrees="360"
    android:pivotX="50%"
    android:pivotY="50%"
    android:duration="1000"
    android:interpolator="@android:anim/linear_interpolator" />

Android LoadingButton library and usage:
- Utilize existing libraries, such as the Ladda library, for implementing loading buttons in Android. Add the library dependency and follow its documentation for usage.
Ladda Library GitHub Repository

Handling button state changes in Android with loading:

Implement a state machine or use boolean flags to track the loading state of a button. Update the UI accordingly when the loading state changes.

boolean isLoading = false;

// Set OnClickListener to handle button click and show/hide loading state
loadingButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (!isLoading) {
            // Show loading state
            isLoading = true;
            loadingButton.setEnabled(false);
            loadingProgressBar.setVisibility(View.VISIBLE);

            // Perform asynchronous task

            // Hide loading state
            isLoading = false;
            loadingButton.setEnabled(true);
            loadingProgressBar.setVisibility(View.INVISIBLE);
        }
    }
});

LoadingButton XML layout examples in Android:

Create XML layouts that include loading buttons with progress indicators, as shown in the previous examples.

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LoadingButton
        android:id="@+id/loadingButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Click Me" />

    <ProgressBar
        android:id="@+id/loadingProgressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:visibility="invisible" />
</RelativeLayout>