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);

}