如何以编程方式获取 Android 导航栏的高度和宽度？

Question

屏幕下方的黑色导航条在Android中是不容易移除的，它从3.0开始作为硬件按钮的替代品已经是Android的一部分。 这是一张照片：

如何获取此 UI 元素的宽度和高度大小（以像素为单位）？

Answer 1

试试下面的代码：

Resources resources = context.getResources();
int resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
if (resourceId > 0) {
    return resources.getDimensionPixelSize(resourceId);
}
return 0;

Answer 2

我通过将应用程序可用的屏幕尺寸与实际屏幕尺寸进行比较来获得导航栏尺寸。 我假设当应用程序可用的屏幕尺寸小于实际屏幕尺寸时，导航栏会出现。 然后我计算导航栏的大小。 此方法适用于 API 14 及更高版本。

public static Point getNavigationBarSize(Context context) {
    Point appUsableSize = getAppUsableScreenSize(context);
    Point realScreenSize = getRealScreenSize(context);

    // navigation bar on the side
    if (appUsableSize.x < realScreenSize.x) {
        return new Point(realScreenSize.x - appUsableSize.x, appUsableSize.y);
    }

    // navigation bar at the bottom
    if (appUsableSize.y < realScreenSize.y) {
        return new Point(appUsableSize.x, realScreenSize.y - appUsableSize.y);
    }

    // navigation bar is not present
    return new Point();
}

public static Point getAppUsableScreenSize(Context context) {
    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    Display display = windowManager.getDefaultDisplay();
    Point size = new Point();
    display.getSize(size);
    return size;
}

public static Point getRealScreenSize(Context context) {
    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    Display display = windowManager.getDefaultDisplay();
    Point size = new Point();

    if (Build.VERSION.SDK_INT >= 17) {
        display.getRealSize(size);
    } else if (Build.VERSION.SDK_INT >= 14) {
        try {
            size.x = (Integer) Display.class.getMethod("getRawWidth").invoke(display);
            size.y = (Integer) Display.class.getMethod("getRawHeight").invoke(display);
        } catch (IllegalAccessException e) {} catch (InvocationTargetException e) {} catch (NoSuchMethodException e) {}
    }

    return size;
}

更新

有关考虑显示切口的解决方案，请查看John 的答案。

Answer 3

NavigationBar 高度因某些设备而异，但对于某些方向也是如此。 首先，您必须检查设备是否具有导航栏，然后检查设备是平板电脑还是非平板电脑（手机），最后您必须查看设备的方向以获得正确的高度。

public int getNavBarHeight(Context c) {
         int result = 0;
         boolean hasMenuKey = ViewConfiguration.get(c).hasPermanentMenuKey();
         boolean hasBackKey = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);

         if(!hasMenuKey && !hasBackKey) {
             //The device has a navigation bar
             Resources resources = c.getResources();

             int orientation = resources.getConfiguration().orientation;
             int resourceId;
             if (isTablet(c)){
                 resourceId = resources.getIdentifier(orientation == Configuration.ORIENTATION_PORTRAIT ? "navigation_bar_height" : "navigation_bar_height_landscape", "dimen", "android");
             }  else {
                 resourceId = resources.getIdentifier(orientation == Configuration.ORIENTATION_PORTRAIT ? "navigation_bar_height" : "navigation_bar_width", "dimen", "android");     
             }

             if (resourceId > 0) {
                 return resources.getDimensionPixelSize(resourceId);
             }
         }
         return result;
} 


private boolean isTablet(Context c) {
    return (c.getResources().getConfiguration().screenLayout
            & Configuration.SCREENLAYOUT_SIZE_MASK)
            >= Configuration.SCREENLAYOUT_SIZE_LARGE;
}

Answer 4

实际上平板电脑（至少 Nexus 7）上的导航栏在纵向和横向上有不同的大小，所以这个功能应该是这样的：

private int getNavigationBarHeight(Context context, int orientation) {
    Resources resources = context.getResources();

    int id = resources.getIdentifier(
            orientation == Configuration.ORIENTATION_PORTRAIT ? "navigation_bar_height" : "navigation_bar_height_landscape",
            "dimen", "android");
    if (id > 0) {
        return resources.getDimensionPixelSize(id);
    }
    return 0;
}

Answer 5

我认为更好的答案在这里，因为它也可以让您获得均匀的切口高度。

获取您的根视图，并添加 setOnApplyWindowInsetsListener （或者您可以从中覆盖 onApplyWindowInsets），并从中获取插图。

在我的相机活动中，我将等于 systemBars.bottom 的填充添加到我的底部布局中。 最后，它修复了剪切问题。

使用 appcompat 是这样的

ViewCompat.setOnApplyWindowInsetsListener(binding.root) { v, insets ->
    val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
    binding.takePictureLayout.apply {
        setPaddingRelative(paddingStart, paddingTop, paddingEnd, systemBars.bottom)
    }
    return@setOnApplyWindowInsetsListener insets
}

没有 appcompat，这个：

mCameraSourcePreview.setOnApplyWindowInsetsListener((v, insets) -> { ... })

Answer 6

我希望这可以帮助你

public int getStatusBarHeight() {
    int result = 0;
    int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
    if (resourceId > 0) {
        result = getResources().getDimensionPixelSize(resourceId);
    }
    return result;
}

public int getNavigationBarHeight()
{
    boolean hasMenuKey = ViewConfiguration.get(context).hasPermanentMenuKey();
    int resourceId = getResources().getIdentifier("navigation_bar_height", "dimen", "android");
    if (resourceId > 0 && !hasMenuKey)
    {
        return getResources().getDimensionPixelSize(resourceId);
    }
    return 0;
}

Answer 7

这是我将 paddingRight 和 paddingBottom 添加到 View 以避开导航栏的代码。 我在这里结合了一些答案，并与isInMultiWindowMode一起为横向制作了一个特殊的子句。 关键是要阅读navigation_bar_height ，还要检查config_showNavigationBar以确保我们应该实际使用高度。

以前的解决方案都不适合我。 从 Android 7.0 开始，您必须考虑多窗口模式。 这打破了将display.realSize与display.size进行比较的实现，因为realSize为您提供了整个屏幕的尺寸（两个拆分窗口），而size只为您提供了 App 窗口的尺寸。 将填充设置为这种差异将使您的整个视图处于填充状态。

/** Adds padding to a view to dodge the navigation bar.

    Unfortunately something like this needs to be done since there
    are no attr or dimens value available to get the navigation bar
    height (as of December 2016). */
public static void addNavigationBarPadding(Activity context, View v) {
    Resources resources = context.getResources();
    if (hasNavigationBar(resources)) {
        int orientation = resources.getConfiguration().orientation;
        int size = getNavigationBarSize(resources);
        switch (orientation) {
        case Configuration.ORIENTATION_LANDSCAPE:
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N &&
                context.isInMultiWindowMode()) { break; }
            v.setPadding(v.getPaddingLeft(), v.getPaddingTop(),
                         v.getPaddingRight() + size, v.getPaddingBottom());
            break;
        case Configuration.ORIENTATION_PORTRAIT:
            v.setPadding(v.getPaddingLeft(), v.getPaddingTop(),
                         v.getPaddingRight(), v.getPaddingBottom() + size);
            break;
        }
    }
}

private static int getNavigationBarSize(Resources resources) {
    int resourceId = resources.getIdentifier("navigation_bar_height",
                                             "dimen", "android");
    return resourceId > 0 ? resources.getDimensionPixelSize(resourceId) : 0;
}

private static boolean hasNavigationBar(Resources resources) {
    int hasNavBarId = resources.getIdentifier("config_showNavigationBar",
                                              "bool", "android");
    return hasNavBarId > 0 && resources.getBoolean(hasNavBarId);
}

Answer 8

2021年的新答案来拯救

---

灵感来自Egis 的回答：

context.navigationBarHeight

扩展吸气剂在哪里

val Context.navigationBarHeight: Int
get() {
    val windowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManager

    return if (Build.VERSION.SDK_INT >= 30) {
        windowManager
                .currentWindowMetrics
                .windowInsets
                .getInsets(WindowInsets.Type.navigationBars())
                .bottom

    } else {
        val currentDisplay = try {
            display
        } catch (e: NoSuchMethodError) {
            windowManager.defaultDisplay
        }

        val appUsableSize = Point()
        val realScreenSize = Point()
        currentDisplay?.apply {
            getSize(appUsableSize)
            getRealSize(realScreenSize)
        }

        // navigation bar on the side
        if (appUsableSize.x < realScreenSize.x) {
            return realScreenSize.x - appUsableSize.x
        }

        // navigation bar at the bottom
        return if (appUsableSize.y < realScreenSize.y) {
            realScreenSize.y - appUsableSize.y
        } else 0
    }
}

测试：

• 带导航栏的模拟器
  • 像素 3a (api 30)
  • 像素 2 (api 28)
  • 像素 3 (api 25)
  • 像素 2 (api 21)
• 小米 Poco f2 pro 带和不带导航栏（全屏）

Answer 9

Egidijus 提出的解决方案适用于 Build.VERSION.SDK_INT >= 17

但是在我的设备上使用 Build.VERSION.SDK_INT < 17 执行以下语句时，我得到了“NoSuchMethodException”：

Display.class.getMethod("getRawHeight").invoke(display);

对于这种情况，我已经修改了 getRealScreenSize() 方法：

else if(Build.VERSION.SDK_INT >= 14) 
{
    View decorView = getActivity().getWindow().getDecorView();
    size.x = decorView.getWidth();
    size.y = decorView.getHeight();
}

Answer 10

我为所有设备（包括 Nexus 5、Samsung Galaxy Nexus 6 edge+、Samsung S10、Samsung Note II 等）解决了这个问题。 我认为这将帮助您处理与设备相关的问题。

在这里，我添加了两种类型的代码，

Java 代码（适用于原生 Android）：

import android.content.Context;
import android.content.res.Resources;
import android.os.Build;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.ViewConfiguration;
import android.view.WindowManager;

public class DeviceSpec {

    private int resourceID = -1;
    private Display display = null;
    private DisplayMetrics displayMetrics = null;
    private DisplayMetrics realDisplayMetrics = null;
    private Resources resources = null;
    private WindowManager windowManager = null;

    public double GetNavigationBarHeight(Context context) {
        try {
            windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
            display = windowManager.getDefaultDisplay();
            displayMetrics = new DisplayMetrics();
            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
                realDisplayMetrics = new DisplayMetrics();
                display.getMetrics(displayMetrics);
                display.getRealMetrics(realDisplayMetrics);
                if(displayMetrics.heightPixels != realDisplayMetrics.heightPixels) {
                    resources = context.getResources();
                    return GetNavigationBarSize(context);
                }
            }
            else {
                resources = context.getResources();
                resourceID = resources.getIdentifier("config_showNavigationBar", "bool", "android");
                if (resourceID > 0 && resources.getBoolean(resourceID))
                    return GetNavigationBarSize(context);
            }
        }
        catch (Exception e){
            e.printStackTrace();
        }
        return 0;
    }

    private double GetNavigationBarSize(Context context) {
        resourceID = resources.getIdentifier("navigation_bar_height", "dimen", "android");
        if (resourceID > 0 && ViewConfiguration.get(context).hasPermanentMenuKey())
           return (resources.getDimensionPixelSize(resourceID) / displayMetrics.density);
        return 0;
    }
}

和 C# 代码（用于 Xamarin Forms/Android）

int resourceId = -1;
        IWindowManager windowManager = null;
        Display defaultDisplay = null;
        DisplayMetrics displayMatrics = null;
        DisplayMetrics realMatrics = null;
        Resources resources = null;

        public double NavigationBarHeight
        {
            get
            {
                try
                {
                    windowManager = Forms.Context.GetSystemService(Context.WindowService).JavaCast<IWindowManager>();
                    defaultDisplay = windowManager.DefaultDisplay;
                    displayMatrics = new DisplayMetrics();
                    if (Build.VERSION.SdkInt >= BuildVersionCodes.JellyBeanMr2)
                    {
                        realMatrics = new DisplayMetrics();
                        defaultDisplay.GetMetrics(displayMatrics);
                        defaultDisplay.GetRealMetrics(realMatrics);
                        if (displayMatrics.HeightPixels != realMatrics.HeightPixels)
                        {
                            resources = Forms.Context.Resources;
                            return GetHeightOfNivigationBar();
                        }
                    }
                    else {
                        resources = Forms.Context.Resources;
                        resourceId = resources.GetIdentifier("config_showNavigationBar", "bool", "android");
                        if (resourceId > 0 && resources.GetBoolean(resourceId))
                            return GetHeightOfNivigationBar();
                    }
                }
                catch (Exception e) { }
                return 0;
            }
        }

        private double GetHeightOfNivigationBar()
        {
            resourceId = resources.GetIdentifier("navigation_bar_height", "dimen", "android");
            if (!ViewConfiguration.Get(Forms.Context).HasPermanentMenuKey && resourceId > 0)
            {
                return resources.GetDimensionPixelSize(resourceId) / displayMatrics.Density;
            }
            return 0;
        }

Answer 11

用于获取导航栏高度（以像素为单位）的测试代码：

public static int getNavBarHeight(Context c) {
    int resourceId = c.getResources()
                      .getIdentifier("navigation_bar_height", "dimen", "android");
    if (resourceId > 0) {
        return c.getResources().getDimensionPixelSize(resourceId);
    }
    return 0;
}

用于获取状态栏高度的测试代码（以像素为单位）：

public static int getStatusBarHeight(Context c) {
    int resourceId = c.getResources()
                      .getIdentifier("status_bar_height", "dimen", "android");
    if (resourceId > 0) {
        return c.getResources().getDimensionPixelSize(resourceId);
    }
    return 0;
}

将像素转换为 dp：

public static int pxToDp(int px) {
    return (int) (px / Resources.getSystem().getDisplayMetrics().density);
}

Answer 12

如何获取导航栏和状态栏的高度。 此代码适用于某些华为设备和三星设备。 Egis 上面的解决方案很好，但是在某些设备上仍然不正确。 所以，我改进了它。

这是获取状态栏高度的代码

private fun getStatusBarHeight(resources: Resources): Int {
        var result = 0
        val resourceId = resources.getIdentifier("status_bar_height", "dimen", "android")
        if (resourceId > 0) {
            result = resources.getDimensionPixelSize(resourceId)
        }
        return result
    }

即使隐藏导航栏，此方法也始终返回导航栏的高度。

private fun getNavigationBarHeight(resources: Resources): Int {
    val resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android")
    return if (resourceId > 0) {
        resources.getDimensionPixelSize(resourceId)
    } else 0
}

注意：在三星 A70 上，此方法返回状态栏高度 + 导航栏高度。 在其他设备（华为）上，它只返回导航栏的高度，隐藏导航栏时返回0。

private fun getNavigationBarHeight(): Int {
        val display = activity?.windowManager?.defaultDisplay
        return if (display == null) {
            0
        } else {
            val realMetrics = DisplayMetrics()
            display.getRealMetrics(realMetrics)
            val metrics = DisplayMetrics()
            display.getMetrics(metrics)
            realMetrics.heightPixels - metrics.heightPixels
        }
    }

这是获取导航栏和状态栏高度的代码

val metrics = DisplayMetrics()
        activity?.windowManager?.defaultDisplay?.getRealMetrics(metrics)

        //resources is got from activity

        //NOTE: on SamSung A70, this height = height of status bar + height of Navigation bar
        //On other devices (Huawei), this height = height of Navigation bar
        val navigationBarHeightOrNavigationBarPlusStatusBarHeight = getNavigationBarHeight()

        val statusBarHeight = getStatusBarHeight(resources)
        //The method will always return the height of navigation bar even when the navigation bar was hidden.
        val realNavigationBarHeight = getNavigationBarHeight(resources)

        val realHeightOfStatusBarAndNavigationBar =
                if (navigationBarHeightOrNavigationBarPlusStatusBarHeight == 0 || navigationBarHeightOrNavigationBarPlusStatusBarHeight < statusBarHeight) {
                    //Huawei: navigation bar is hidden
                    statusBarHeight
                } else if (navigationBarHeightOrNavigationBarPlusStatusBarHeight == realNavigationBarHeight) {
                    //Huawei: navigation bar is visible
                    statusBarHeight + realNavigationBarHeight
                } else if (navigationBarHeightOrNavigationBarPlusStatusBarHeight < realNavigationBarHeight) {
                    //SamSung A70: navigation bar is still visible but it only displays as a under line
                    //navigationBarHeightOrNavigationBarPlusStatusBarHeight = navigationBarHeight'(under line) + statusBarHeight
                    navigationBarHeightOrNavigationBarPlusStatusBarHeight
                } else {
                    //SamSung A70: navigation bar is visible
                    //navigationBarHeightOrNavigationBarPlusStatusBarHeight == statusBarHeight + realNavigationBarHeight
                    navigationBarHeightOrNavigationBarPlusStatusBarHeight
                }

Answer 13

我已经做到了，它适用于我测试的每台设备，甚至在模拟器上：

// Return the NavigationBar height in pixels if it is present, otherwise return 0
public static int getNavigationBarHeight(Activity activity) {
    Rect rectangle = new Rect();
    DisplayMetrics displayMetrics = new DisplayMetrics();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rectangle);
    activity.getWindowManager().getDefaultDisplay().getRealMetrics(displayMetrics);
    return displayMetrics.heightPixels - (rectangle.top + rectangle.height());
}

Answer 14

底部导航栏的高度为 48dp（纵向和横向模式），垂直放置时为 42dp。

Answer 15

结合@egis 和其他人的答案 - 这适用于各种设备，在 Pixel EMU、Samsung S6、Sony Z3、Nexus 4 上进行了测试。此代码使用显示尺寸来测试导航栏的可用性，然后使用实际系统导航栏大小（如果存在）。

 /** * Calculates the system navigation bar size. */ public final class NavigationBarSize { private final int systemNavBarHeight; @NonNull private final Point navBarSize; public NavigationBarSize(@NonNull Context context) { Resources resources = context.getResources(); int displayOrientation = resources.getConfiguration().orientation; final String name; switch (displayOrientation) { case Configuration.ORIENTATION_PORTRAIT: name = "navigation_bar_height"; break; default: name = "navigation_bar_height_landscape"; } int id = resources.getIdentifier(name, "dimen", "android"); systemNavBarHeight = id > 0 ? resources.getDimensionPixelSize(id) : 0; navBarSize = getNavigationBarSize(context); } public void adjustBottomPadding(@NonNull View view, @DimenRes int defaultHeight) { int height = 0; if (navBarSize.y > 0) { // the device has a nav bar, get the correct size from the system height = systemNavBarHeight; } if (height == 0) { // fallback to default height = view.getContext().getResources().getDimensionPixelSize(defaultHeight); } view.setPadding(0, 0, 0, height); } @NonNull private static Point getNavigationBarSize(@NonNull Context context) { Point appUsableSize = new Point(); Point realScreenSize = new Point(); WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); if (windowManager != null) { Display display = windowManager.getDefaultDisplay(); display.getSize(appUsableSize); display.getRealSize(realScreenSize); } return new Point(realScreenSize.x - appUsableSize.x, realScreenSize.y - appUsableSize.y); } }

Answer 16

简单的一站式解决方案

如上述许多答案中所建议的，例如

• https://stackoverflow.com/a/29938139/9640177
• https://stackoverflow.com/a/26118045/9640177
• https://stackoverflow.com/a/50775459/9640177
• https://stackoverflow.com/a/41057024/9640177

仅仅获得导航栏的高度可能还不够。 我们需要考虑 1. 导航栏是否存在， 2. 是在底部，还是在右侧或左侧， 3. 应用程序是否以多窗口模式打开。

幸运的是，您只需在根布局中设置android:fitsSystemWindows="true"即可轻松绕过所有冗长的编码。 Android 系统会自动为根布局添加必要的填充，以确保子视图不会进入导航栏或状态栏区域。

有一个简单的单行解决方案

android:fitsSystemWindows="true"

或以编程方式

findViewById(R.id.your_root_view).setFitsSystemWindows(true);

您还可以通过以下方式获得根视图

findViewById(android.R.id.content).getRootView();
or
getWindow().getDecorView().findViewById(android.R.id.content)

有关获取根视图的更多详细信息，请参阅 - https://stackoverflow.com/a/4488149/9640177

Answer 17

这是我解决这个问题的方法。 我制作了一个可隐藏的底部栏，它需要根据是否有导航栏（电容式、屏幕上或只是棒棒糖前）来填充。

---

看法

setPadding(0, 0, 0, Utils.hasNavBar(getContext()) ? 30 : 0);

---

实用程序.java

public static boolean hasNavBar(Context context) {
    // Kitkat and less shows container above nav bar
    if (android.os.Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
        return false;
    }
    // Emulator
    if (Build.FINGERPRINT.startsWith("generic")) {
        return true;
    }
    boolean hasMenuKey = ViewConfiguration.get(context).hasPermanentMenuKey();
    boolean hasBackKey = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);
    boolean hasNoCapacitiveKeys = !hasMenuKey && !hasBackKey;
    Resources resources = context.getResources();
    int id = resources.getIdentifier("config_showNavigationBar", "bool", "android");
    boolean hasOnScreenNavBar = id > 0 && resources.getBoolean(id);
    return hasOnScreenNavBar || hasNoCapacitiveKeys || getNavigationBarHeight(context, true) > 0;
}

public static int getNavigationBarHeight(Context context, boolean skipRequirement) {
    int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
    if (resourceId > 0 && (skipRequirement || hasNavBar(context))) {
        return context.getResources().getDimensionPixelSize(resourceId);
    }
    return 0;
}

Answer 18

就我而言，我想要这样的东西：

我必须遵循@Mdlc建议的相同操作，但可能稍微简单一些（仅针对 >= 21）：

    //kotlin
    val windowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManager
    val realSize = Point()
    windowManager.defaultDisplay.getRealSize(realSize);
    val usableRect = Rect()
    windowManager.defaultDisplay.getRectSize(usableRect)
    Toast.makeText(this, "Usable Screen: " + usableRect + " real:"+realSize, Toast.LENGTH_LONG).show()

    window.decorView.setPadding(usableRect.left, usableRect.top, realSize.x - usableRect.right, realSize.y - usableRect.bottom)

它也适用于景观：

编辑上述解决方案在多窗口模式下无法正常工作，其中可用矩形不仅由于导航栏而且由于自定义窗口大小而变小。 我注意到的一件事是，在多窗口中，导航栏没有悬停在应用程序上，因此即使没有更改 DecorView 填充，我们也有正确的行为：

请注意在这些场景中导航栏悬停在应用程序底部的方式之间的区别。 幸运的是，这很容易解决。 我们可以检查应用程序是否是多窗口。 下面的代码还包括计算和调整工具栏位置的部分（完整解决方案： https ://stackoverflow.com/a/14213035/477790）

    // kotlin
    // Let the window flow into where window decorations are
    window.addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN)
    window.addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS)

    // calculate where the bottom of the page should end up, considering the navigation bar (back buttons, ...)
    val windowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManager
    val realSize = Point()
    windowManager.defaultDisplay.getRealSize(realSize);
    val usableRect = Rect()
    windowManager.defaultDisplay.getRectSize(usableRect)
    Toast.makeText(this, "Usable Screen: " + usableRect + " real:" + realSize, Toast.LENGTH_LONG).show()

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N || !isInMultiWindowMode) {
        window.decorView.setPadding(usableRect.left, usableRect.top, realSize.x - usableRect.right, realSize.y - usableRect.bottom)
        // move toolbar/appbar further down to where it should be and not to overlap with status bar
        val layoutParams = ConstraintLayout.LayoutParams(appBarLayout.layoutParams as ConstraintLayout.LayoutParams)
        layoutParams.topMargin = getSystemSize(Constants.statusBarHeightKey)
        appBarLayout.layoutParams = layoutParams
    }

三星弹出模式的结果：

Answer 19

在三星 S8 的情况下，上述提供的方法都没有提供适当的导航栏高度，所以我使用了 KeyboardHeightProvider键盘高度提供程序 android 。 它给了我负值的高度，对于我的布局定位，我在计算中调整了这个值。

这是KeyboardHeightProvider.java ：

import android.app.Activity;
import android.content.res.Configuration;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager.LayoutParams;
import android.widget.PopupWindow;


/**
 * The keyboard height provider, this class uses a PopupWindow
 * to calculate the window height when the floating keyboard is opened and closed. 
 */
public class KeyboardHeightProvider extends PopupWindow {

    /** The tag for logging purposes */
    private final static String TAG = "sample_KeyboardHeightProvider";

    /** The keyboard height observer */
    private KeyboardHeightObserver observer;

    /** The cached landscape height of the keyboard */
    private int keyboardLandscapeHeight;

    /** The cached portrait height of the keyboard */
    private int keyboardPortraitHeight;

    /** The view that is used to calculate the keyboard height */
    private View popupView;

    /** The parent view */
    private View parentView;

    /** The root activity that uses this KeyboardHeightProvider */
    private Activity activity;

    /** 
     * Construct a new KeyboardHeightProvider
     * 
     * @param activity The parent activity
     */
    public KeyboardHeightProvider(Activity activity) {
        super(activity);
        this.activity = activity;

        LayoutInflater inflator = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        this.popupView = inflator.inflate(R.layout.popupwindow, null, false);
        setContentView(popupView);

        setSoftInputMode(LayoutParams.SOFT_INPUT_ADJUST_RESIZE | LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);

        parentView = activity.findViewById(android.R.id.content);

        setWidth(0);
        setHeight(LayoutParams.MATCH_PARENT);

        popupView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

                @Override
                public void onGlobalLayout() {
                    if (popupView != null) {
                        handleOnGlobalLayout();
                    }
                }
            });
    }

    /**
     * Start the KeyboardHeightProvider, this must be called after the onResume of the Activity.
     * PopupWindows are not allowed to be registered before the onResume has finished
     * of the Activity.
     */
    public void start() {

        if (!isShowing() && parentView.getWindowToken() != null) {
            setBackgroundDrawable(new ColorDrawable(0));
            showAtLocation(parentView, Gravity.NO_GRAVITY, 0, 0);
        }
    }

    /**
     * Close the keyboard height provider, 
     * this provider will not be used anymore.
     */
    public void close() {
        this.observer = null;
        dismiss();
    }

    /** 
     * Set the keyboard height observer to this provider. The 
     * observer will be notified when the keyboard height has changed. 
     * For example when the keyboard is opened or closed.
     * 
     * @param observer The observer to be added to this provider.
     */
    public void setKeyboardHeightObserver(KeyboardHeightObserver observer) {
        this.observer = observer;
    }

    /**
     * Get the screen orientation
     *
     * @return the screen orientation
     */
    private int getScreenOrientation() {
        return activity.getResources().getConfiguration().orientation;
    }

    /**
     * Popup window itself is as big as the window of the Activity. 
     * The keyboard can then be calculated by extracting the popup view bottom 
     * from the activity window height. 
     */
    private void handleOnGlobalLayout() {

        Point screenSize = new Point();
        activity.getWindowManager().getDefaultDisplay().getSize(screenSize);

        Rect rect = new Rect();
        popupView.getWindowVisibleDisplayFrame(rect);

        // REMIND, you may like to change this using the fullscreen size of the phone
        // and also using the status bar and navigation bar heights of the phone to calculate
        // the keyboard height. But this worked fine on a Nexus.
        int orientation = getScreenOrientation();
        int keyboardHeight = screenSize.y - rect.bottom;

        if (keyboardHeight == 0) {
            notifyKeyboardHeightChanged(0, orientation);
        }
        else if (orientation == Configuration.ORIENTATION_PORTRAIT) {
            this.keyboardPortraitHeight = keyboardHeight; 
            notifyKeyboardHeightChanged(keyboardPortraitHeight, orientation);
        } 
        else {
            this.keyboardLandscapeHeight = keyboardHeight; 
            notifyKeyboardHeightChanged(keyboardLandscapeHeight, orientation);
        }
    }

    /**
     *
     */
    private void notifyKeyboardHeightChanged(int height, int orientation) {
        if (observer != null) {
            observer.onKeyboardHeightChanged(height, orientation);
        }
    }

    public interface KeyboardHeightObserver {
        void onKeyboardHeightChanged(int height, int orientation);
    }
}

popupwindow.xml ：

<?xml version="1.0" encoding="utf-8"?>
<View
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/popuplayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/transparent"
    android:orientation="horizontal"/>

MainActivity中的用法

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*

/**
 * Created by nileshdeokar on 22/02/2018.
 */
class MainActivity : AppCompatActivity() , KeyboardHeightProvider.KeyboardHeightObserver  {

    private lateinit var keyboardHeightProvider : KeyboardHeightProvider


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        keyboardHeightProvider = KeyboardHeightProvider(this)
        parentActivityView.post { keyboardHeightProvider?.start() }
    }

    override fun onKeyboardHeightChanged(height: Int, orientation: Int) {
        // In case of 18:9 - e.g. Samsung S8
        // here you get the height of the navigation bar as negative value when keyboard is closed.
        // and some positive integer when keyboard is opened.
    }

    public override fun onPause() {
        super.onPause()
        keyboardHeightProvider?.setKeyboardHeightObserver(null)
    }

    public override fun onResume() {
        super.onResume()
        keyboardHeightProvider?.setKeyboardHeightObserver(this)
    }

    public override fun onDestroy() {
        super.onDestroy()
        keyboardHeightProvider?.close()
    }
}

如需进一步帮助，您可以在此处查看此高级用法。

Answer 20

我处理剪裁+导航栏的版本

fun View.getCutoutRect(): Rect {
    return when {
        isInEditMode -> {
            val cutout = context.dpToPx(16f).roundToInt()
            Rect(cutout, cutout, cutout, cutout)
        }
        Build.VERSION.SDK_INT >= Build.VERSION_CODES.M -> {
            val windowInsets = (context as? AppCompatActivity)?.window?.decorView?.rootWindowInsets ?: run {
                requestLayout()
                return Rect()
            }
            val cutout = WindowInsetsCompat.toWindowInsetsCompat(windowInsets).displayCutout
            val systemBars = WindowInsetsCompat.toWindowInsetsCompat(windowInsets).getInsets(WindowInsetsCompat.Type.systemBars())

            Rect(
                maxOf(cutout?.safeInsetLeft ?: 0, systemBars.left),
                maxOf(cutout?.safeInsetTop ?: 0, systemBars.top),
                maxOf(cutout?.safeInsetRight ?: 0, systemBars.right),
                maxOf(cutout?.safeInsetBottom ?: 0, systemBars.bottom),
            )
        }
        else -> {
            val savedRect = (this.getTag(R.id.view_insets_tag_id) as? Rect) ?: Rect()
            ViewCompat.setOnApplyWindowInsetsListener(this) { v, insets ->
                val cutout = insets.displayCutout
                val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
                val rect = Rect(
                    maxOf(cutout?.safeInsetLeft ?: 0, systemBars.left),
                    maxOf(cutout?.safeInsetTop ?: 0, systemBars.top),
                    maxOf(cutout?.safeInsetRight ?: 0, systemBars.right),
                    maxOf(cutout?.safeInsetBottom ?: 0, systemBars.bottom),
                )
                this.setTag(R.id.view_insets_tag_id, rect)
                if (savedRect != rect) {
                    requestLayout()
                }
                return@setOnApplyWindowInsetsListener insets
            }
            this.requestApplyInsets()
            savedRect
        }
    }
}

Answer 21

我建议使用两个上下文扩展来获取以 px 为单位的状态栏高度和以 px 为单位的底部导航栏高度

状态栏高度（以 px 为单位）

val Context.statusBarHeightInPx
    get() = run {
        val resourceId = this.resources.getIdentifier(
            "status_bar_height",
            "dimen",
            "android"
        )
        this.resources.getDimensionPixelSize(resourceId) / this.resources.displayMetrics.density
    }

底部导航栏高度（以 px 为单位）

val Context.navBarHeightInPx
    get() = run {
        val resourceId = this.resources.getIdentifier(
            "navigation_bar_height",
            "dimen",
            "android"
        )
        this.resources.getDimensionPixelSize(resourceId) / this.resources.displayMetrics.density
    }

Answer 22

从 Android R (SDK 30+)，您可以使用此代码获取状态栏和导航栏的大小

WindowInsets insets = activity.getWindowManager().getCurrentWindowMetrics().getWindowInsets();
int statusBarHeight = insets.getInsets(WindowInsetsCompat.Type.statusBars()).top; //in pixels
int navigationBarHeight = insets.getInsets(WindowInsetsCompat.Type.navigationBars()).bottom; //in pixels

Answer 23

要获取布局 XML 本身的高度（当 clipToPadding 为 false 时，对于回收视图中的最后一个元素很有用），您可以使用属性actionBarSize ：

android:paddingBottom="?attr/actionBarSize"