How Can I Correctly Use runOnUiThread to Update the Android UI from a Background Thread?

How to Effectively Utilize runOnUiThread in Android Development

When working with the UI thread in Android, it's crucial to prevent potential crashes by ensuring that UI-related tasks are executed on the correct thread. The runOnUiThread method plays a vital role in this process.

In the provided code example, the misconception lies within the implementation of the runThread method. Attempting to create a thread using runOnUiThread will result in an error, as runOnUiThread is designed to handle UI operations rather than creating threads.

To correct this issue, the runThread method should be modified as follows:

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();
}

This corrected version creates a separate thread and utilizes runOnUiThread within that thread to perform UI-related tasks (in this case, updating the button text). This approach ensures that the UI thread remains responsive while the time-consuming operation (the loop) executes in the background.

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