How to Make Splash Screen Android

public class SplashActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_splash);

        Thread timerThread = new Thread() {
            public void run() {
                try {
                    sleep(3000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {

                    //SharedPreferences sharedpreferences = getSharedPreferences(AppConstant.TAG_MyPref, Context.MODE_PRIVATE);
                    //String Student_Id = sharedpreferences.getString(AppConstant.TAG_Student_Id, null);

                    Intent intent = new Intent(SplashActivity.this, MainActivity.class);
                    startActivity(intent);
                    finish();
                }
            }
        };
        timerThread.start();
    }
}