Question

when I start my Activity, I notice a short delay. I click on my app icon and the home screen stays on the screen for about 1-1.5 sec before my activity is shown.

My activity’s onCreate method takes about 800ms to finish.

I’ve also noticed that setting android:screenOrientation="landscape" also adds a noticeable delay, even when I use a test Activity with an empty layout.

Is there a way to get rid of this delay, or at least show a black screen while the UI is loading?

Edited: see code for test activity below. In my real activity there is a bunch of other loading including GUI elements and engine logic, sound, etc. The real issue is that the delay is visible even using this small test activity.

---

Code for test activity:

public class TestActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Set full screen mode and disable
        // the keyguard (lockscreen)
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN  
                             | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD 
                             | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                             | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        setContentView(R.layout.main);
    }
}

Layout XML:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:keepScreenOn="true"  >
</FrameLayout>

Manifest:

<activity
    android:name=".TestActivity"
    android:configChanges="orientation|keyboardHidden"
    android:label="@string/app_name"
    android:screenOrientation="landscape"
    android:windowSoftInputMode="stateAlwaysHidden|adjustPan" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

Answer 1

you could set the default activity to a near blank activity that does nothing more than show a background and start your real activity.. like a splash screen