实现上述效果的代码如下：

public class MainActivity extends Activity {
	
    @SuppressLint("InlinedApi")
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        if(VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
        	Window window = getWindow();
			window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS
					| WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
			window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
							| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
							| View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
            window.setNavigationBarColor(Color.TRANSPARENT);
        }

        setContentView(R.layout.activity_main);
    }

}