android设置全面屏

1.xml设置fitsSystemWindows = false

2.配置themes

3.onCreate中配置全面屏：

```java

window.decorView.systemUiVisibility=View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATIONor View.SYSTEM_UI_FLAG_LAYOUT_STABLE

// 设置状态栏和导航栏为透明

if (Build.VERSION.SDK_INT >=Build.VERSION_CODES.LOLLIPOP) {

    window.statusBarColor =Color.TRANSPARENT

    window.navigationBarColor =Color.TRANSPARENT

}

```