How to perform some action when my Android app is launched -

i creating android app. want voice sort of message execute when app launches . have figured out message part using text speech, cannot execute automatically on app startup.can me out ?

if want execute code once wehn app starts 1 possible solution: public class myapp extends application {

    public myapp() {         // method fires once per application start.          // getapplicationcontext returns null here          log.i("main", "constructor fired");     }      @override     public void oncreate() {         super.oncreate();              // method fires once constructor          // application has context here          log.i("main", "oncreate fired");      } } 

then should register class application class inside androidmanifest.xml

<application android:label="@string/app_name" android:name=".myapp"> <------- here     <activity android:name="myactivity"               android:label="@string/app_name">         <intent-filter>             <action android:name="android.intent.action.main"/>             <category android:name="android.intent.category.launcher"/>         </intent-filter>     </activity> </application>