Sleep（） in Android Java

我正在按照本教程在我的程序中有一个加载屏幕。教程说我的活动应该使用Sleep（）命令，但是它没有将Sleep（）识别为函数，并给我提供了一个错误，询问我是否要创建一个名为Sleep（）的方法。

下面是代码示例：

public class LoadingScreenActivity extends Activity {

    //Introduce an delay
    private final int WAIT_TIME = 2500;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        System.out.println("LoadingScreenActivity screen started");

        setContentView(R.layout.loading_screen);
        findViewById(R.id.mainSpinner1).setVisibility(View.VISIBLE);

        new Handler().postDelayed(new Runnable(){ 

            @Override 
            public void run() {

                //Simulating a long running task
                this.Sleep(1000);
                System.out.println("Going to Profile Data");

                /* Create an Intent that will start the ProfileData-Activity. */
                Intent mainIntent = new Intent(LoadingScreenActivity.this,ProfileData.class); 
                LoadingScreenActivity.this.startActivity(mainIntent);
                LoadingScreenActivity.this.finish(); 
            } 
        }, WAIT_TIME);
    }
}