android 4.4 支持透明状态栏和透明导航栏

@Override

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (VERSION.SDK_INT >= VERSION_CODES.KITKAT) {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        }
        setContentView(R.layout.activity_main);

}