How to Implement Delayed Method Invocation in Android?

Delaying Method Invocation in Android

Android developers often face the need to execute a method after a specific delay. While Objective-C offers the convenient performSelector method for this purpose, a similar method is not explicitly available in Android's Java API.

The Handler API

To achieve delayed method calls in Android, you can leverage the Handler class, which handles message queues for inter-thread communication. Here's how to use it:

Kotlin

Handler(Looper.getMainLooper()).postDelayed({
    // Do something after 100ms
}, 100)

Java

final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        // Do something after 100ms
    }
}, 100);

In this code, the postDelayed method takes two arguments:

• A Runnable object representing the task to be executed after the delay.
• The delay in milliseconds.

By customizing the delay value, you can schedule a method to be called after any desired interval. This technique is useful for tasks such as UI updates, background operations, and repeating alarms.

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