How Can runOnUiThread Ensure Smooth UI Interactions in Android?

Making the UI-Thread Work with runOnUiThread in Android

When working with Android development, interacting with the user interface must be done within the UI-Thread to avoid unexpected behavior or crashes. This article explores the proper utilization of the runOnUiThread method to ensure seamless operation within the UI-Thread.

The initial code attempted to use runOnUiThread incorrectly, leading to the application becoming unresponsive upon button click. The corrected runThread function is shown below:

private void runThread() {

    new Thread() {
        public void run() {
            while (i++ < 1000) {
                try {
                    runOnUiThread(new Runnable() {

                        @Override
                        public void run() {
                            btn.setText("#" + i);
                        }
                    });
                    Thread.sleep(300);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }.start();
}

The crucial difference lies in moving the call to runOnUiThread inside a separate Runnable, which guarantees that any UI operations are performed within the main thread, as opposed to the background thread that was being used before.

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