スプラッシュ画面を表示する方法

SplashActivity.java

public class SplashActivity extends Activity {

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

        Handler handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                Intent intent = new Intent(getApplicationContext(), MainActivity.class);
                startActivity(intent);
                finish();
            }
        };

        handler.sendEmptyMessageDelayed(0, 3000);
    }
}