Android display Splash-Screen while loading

Question

I have an Android App, which shows a "Splash Screen" for 3 seconds. After that, the MainActivity gets loaded.

Unfortunately the MainActivity takes additional ~4 seconds to load. On first startup even longer. However when the App is loaded, everything runs smooth.

Now how can I achieve it, that the MainActivity gets loaded, during the display of the Splash Screen? It just should display an image until the whole thing loaded completely. I have read about Async-Task, but I'm not sure where to put it and how to use it properly. Can someone help me please?

SplashScreen.java

public class SplashScreen extends Activity {
    private static int SPLASH_TIME_OUT = 3000;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_startup);

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent i = new Intent(SplashScreen.this, MainActivity.class);
                startActivity(i);
                finish();
            }
        }, SPLASH_TIME_OUT);
    }
}

MainActivity.java

public class MainActivity extends Activity implements OnClickListener, MediaController.MediaPlayerControl {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Some heavy processing
        //starting services
        //starting Google Text to Speech
        //and so on...

    }

}

One workaround may be to use only MainActivity, initially displaying splash screen layout, later hiding/removing it (via the Handler.postDelayed(), for example) to show the actual Activity layout. — Mikhail
This new tip from the Android Developers might be helpful: plus.google.com/+AndroidDevelopers/posts/Z1Wwainpjhd — Gerald Schneider
Have you googled yet?There are tons of example for you.Check this androidhive.info/2013/07/… — Soham
Thanks for the comments! @Soham: My sample code is from exactly the same source like your link... So YES I have googled it. My problem however was solved here by TmKVU — HorstB

TmKVU TmKVU · Accepted Answer · 2015-07-17T10:34:26

If there are no specific constraints about the time the splash screen should be shown, you could use the AsyncTask in the following way:

public class SplashScreen extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_startup);
        startHeavyProcessing();

    }

    private void startHeavyProcessing(){
       new LongOperation().execute("");
    }

    private class LongOperation extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            //some heavy processing resulting in a Data String
            for (int i = 0; i < 5; i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    Thread.interrupted();
                }
            }
            return "whatever result you have";
        }

        @Override
        protected void onPostExecute(String result) {
            Intent i = new Intent(SplashScreen.this, MainActivity.class);
            i.putExtra("data", result);
            startActivity(i);
            finish();
        }

        @Override
        protected void onPreExecute() {}

        @Override
        protected void onProgressUpdate(Void... values) {}
    }
}

If the resulting data if of another nature than a String you could put a Parcelable Object as an extra to your activity. In onCreate you can retrieve the data with:

getIntent().getExtras.getString('data');

Android display Splash-Screen while loading

6 Answers