public class StartActivity extends Activity {
     protected boolean _active = true;
     protected int _splashTime = 5000;

     @Override
     public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.loading_screen);

    Thread splashThread = new Thread() {
        @Override
        public void run(){
            try {
                int waited = 0;
                while(_active && (waited <_splashTime)) {
                    sleep(100);
                    if(_active) {
                        waited +=100;
                    }
                }
            } catch(InterruptedException e) {
            } finally {

                startActivity(new Intent("HNappActivity"));
                finish();

            }
        }
    };
    splashThread.start();
    }

<activity
        android:name=".StartActivity"
        android:label="@string/title_activity_hnapp" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name="HNappActivity"></activity>

09-24 20:47:06.841: E/AndroidRuntime(556): FATAL EXCEPTION: Thread-10
  09-24 20:47:06.841: E/AndroidRuntime(556): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=HNappActivity }
  09-24 20:47:06.841: E/AndroidRuntime(556):    at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1409)
  09-24 20:47:06.841: E/AndroidRuntime(556):    at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
  09-24 20:47:06.841: E/AndroidRuntime(556):    at android.app.Activity.startActivityForResult(Activity.java:2827)
  09-24 20:47:06.841: E/AndroidRuntime(556):    at android.app.Activity.startActivity(Activity.java:2933)
  09-24 20:47:06.841: E/AndroidRuntime(556):    at sk.ecopress.hn.android.StartActivity$1.run(StartActivity.java:37)

startActivity(new Intent("HNappActivity"));

startActivity(new Intent(StartActivity.this, HNappActivity.class));

<activity android:name="HNappActivity"></activity>

<activity android:name=".HNappActivity"></activity>

startActivity(new Intent(StartActivity.this, HNappActivity.class));