How to avoid Black Screen on starting an application

Question

When I start my application initially, I get a black screen which stays for a few seconds before my main activity starts. In case of iphone an image with name default is displayed for that split second. I'm not sure how to do the same in Android. I tried as below in vain :

         <activity android:name=".Index"
              android:label="@string/app_name"
              android:screenOrientation="portrait"
              android:theme="@drawable/defaultimage">
            <intent-filter>
              <action android:name="android.intent.action.MAIN" />
              <category android:name="android.intent.category.LAUNCHER" />
          </intent-filter>
        </activity>  

Answer 1

I guess you have a heavy operation on the onCreate method of your "Index" Activity.

You should put the heavy operations on a thread and make a splash screen with the image, and when the thread is finished, load the menu or whatever you need.

You can make a "loading screen" for example. It's really easy with Android: https://developer.android.com/guide/appendix/faq/commontasks.html#progressbar or https://developer.android.com/reference/android/widget/ProgressBar.html