Android全面屏适配方法详解

window.setFlags(
    WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN
)

	//该方法是从官网复制过来的，效果不如意
    private fun hideSystemBars() {
        val windowInsetsController =
            ViewCompat.getWindowInsetsController(window.decorView) ?: return
        // Configure the behavior of the hidden system bars
        windowInsetsController.systemBarsBehavior =
            WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
        // Hide both the status bar and the navigation bar
        windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
    }

	//这是从别人那里拷过来的（csdn）：https://blog.csdn.net/qq_32664007/article/details/126279919
    private fun hideSystemBars(window: Window) {
        //隐藏状态栏和导航栏 以及交互
        WindowInsetsControllerCompat(window, window.decorView).let {
            //隐藏状态栏和导航栏
            it.hide(WindowInsetsCompat.Type.systemBars())
            //交互效果
            it.systemBarsBehavior =
                WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
        }
    }

val decorView = window.decorView
decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
        or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
        or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
        or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
        or View.SYSTEM_UI_FLAG_FULLSCREEN
        or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY)

WindowCompat.setDecorFitsSystemWindows(window, false)

<item name="android:windowFullscreen">true</item>

//允许window 的内容可以上移到刘海屏状态栏
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
    val lp = window.attributes
    lp.layoutInDisplayCutoutMode =
        WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
    window.attributes = lp
}

/**
 * 沉浸模式（全屏模式）
 * 设置全屏的方法
 * 参数window在activity或AppCompatActivity都带有
 */
fun immersionFull(window: Window) {
    hideSystemBars(window)
    useSpecialScreen(window)
}

/**
 * 隐藏状态栏，显示内容上移到状态栏
 */
private fun hideSystemBars(window: Window) {
    //占满全屏，activity绘制将状态栏也加入绘制范围。
    //如此即使使用BEHAVIOR_SHOW_BARS_BY_SWIPE或BEHAVIOR_SHOW_BARS_BY_TOUCH
    //也不会因为状态栏的显示而导致activity的绘制区域出现变形
    //使用刘海屏也需要这一句进行全屏处理
    WindowCompat.setDecorFitsSystemWindows(window, false)
    //隐藏状态栏和导航栏 以及交互
    WindowInsetsControllerCompat(window, window.decorView).let {
        //隐藏状态栏和导航栏
        //用于WindowInsetsCompat.Type.systemBars()隐藏两个系统栏
        //用于WindowInsetsCompat.Type.statusBars()仅隐藏状态栏
        //用于WindowInsetsCompat.Type.navigationBars()仅隐藏导航栏
        it.hide(WindowInsetsCompat.Type.systemBars())
        //交互效果
        //BEHAVIOR_SHOW_BARS_BY_SWIPE 下拉状态栏操作可能会导致activity画面变形
        //BEHAVIOR_SHOW_BARS_BY_TOUCH 未测试到与BEHAVIOR_SHOW_BARS_BY_SWIPE的明显差异
        //BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE 下拉或上拉的屏幕交互操作会显示状态栏和导航栏
        it.systemBarsBehavior =
            WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
    }
}

/**
 * 扩展使用刘海屏
 */
private fun useSpecialScreen(window: Window) {
    //允许window 的内容可以上移到刘海屏状态栏
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
        val lp = window.attributes
        lp.layoutInDisplayCutoutMode =
            WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
        window.attributes = lp
    }
}

<!-- 导航栏透明 -->
<item name="android:navigationBarColor">
    @android:color/transparent
</item>
<!-- 状态栏透明 -->
<item name="android:statusBarColor">
    @android:color/transparent
</item>
<!-- 不要标题栏 -->
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>