Sleep() in Android Java

You can use one of the folllowing methods:

Thread.sleep(timeInMills);

or

SystemClock.sleep(timeInMills);

SystemClock.sleep(milliseconds) is a utility function very similar to Thread.sleep(milliseconds), but it ignores InterruptedException. Use this function for delays if you do not use Thread.interrupt(), as it will preserve the interrupted state of the thread.

The function is Thread.sleep(long).

Note, however, that you should not perform a sleep on the UI thread.

The code you posted is horrible. Please don't use that on an actual device. You will get an "Application Not Responding" error if you run something similar to this.

If you're using Handlers, keep in mind that a Handler is created on the thread where it runs. So calling new Handler().post(... on the UI thread will execute the runnable on the UI thread, including this "long running operation". The advantage is that you can create a Handler to the UI Thread which you can use later, as shown below.

To put the long running operation into a background thread, you need to create a Thread around the runnable, as shown below. Now if you want to update the UI once the long running operation is complete, you need to post that to the UI Thread, using a Handler.

Note that this functionality is a perfect fit for an AsyncTask which will make this look a lot cleaner than the pattern below. However, I included this to show how Handlers, Threads and Runnables relate.

public class LoadingScreenActivity extends Activity {//Introduce a delay    private final int WAIT_TIME = 2500;    private Handler uiHandler;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        uiHandler = new Handler(); // anything posted to this handler will run on the UI Thread        System.out.println("LoadingScreenActivity  screen started");        setContentView(R.layout.loading_screen);        findViewById(R.id.mainSpinner1).setVisibility(View.VISIBLE);        Runnable onUi = new Runnable() {            @Override             public void run() {                // this will run on the main UI thread                 Intent mainIntent = new Intent(LoadingScreenActivity.this,ProfileData.class);                 LoadingScreenActivity.this.startActivity(mainIntent);                 LoadingScreenActivity.this.finish();             }        };         Runnable background = new Runnable() {             @Override             public void run() {                 // This is the delay                Thread.Sleep( WAIT_TIME );                // This will run on a background thread                //Simulating a long running task                Thread.Sleep(1000);                System.out.println("Going to Profile Data");                uiHandler.post( onUi );            }        };        new Thread( background ).start(); }