有一个非常简单的答案，没有通过上下文

public static int getScreenWidth() {
    return Resources.getSystem().getDisplayMetrics().widthPixels;
}

public static int getScreenHeight() {
    return Resources.getSystem().getDisplayMetrics().heightPixels;
}

注:如果你想要高度包括导航条，使用下面的方法

WindowManager windowManager =
        (WindowManager) BaseApplication.getApplication().getSystemService(Context.WINDOW_SERVICE);
    final Display display = windowManager.getDefaultDisplay();
    Point outPoint = new Point();
    if (Build.VERSION.SDK_INT >= 19) {
        // include navigation bar
        display.getRealSize(outPoint);
    } else {
        // exclude navigation bar
        display.getSize(outPoint);
    }
    if (outPoint.y > outPoint.x) {
        mRealSizeHeight = outPoint.y;
        mRealSizeWidth = outPoint.x;
    } else {
        mRealSizeHeight = outPoint.x;
        mRealSizeWidth = outPoint.y;
    }

使用这段代码，你可以得到运行时显示的宽度和高度:

DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;

在视图中，你需要这样做:

((Activity) getContext()).getWindowManager()
                         .getDefaultDisplay()
                         .getMetrics(displayMetrics);

在某些情况下，设备有一个导航栏，你必须在运行时检查:

public boolean showNavigationBar(Resources resources)
{
    int id = resources.getIdentifier("config_showNavigationBar", "bool", "android");
    return id > 0 && resources.getBoolean(id);
}

如果设备有一个导航栏，那么计算它的高度:

private int getNavigationBarHeight() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        int usableHeight = metrics.heightPixels;
        getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
        int realHeight = metrics.heightPixels;
        if (realHeight > usableHeight)
            return realHeight - usableHeight;
        else
            return 0;
    }
    return 0;
}

所以设备的最终高度是:

int height = displayMetrics.heightPixels + getNavigationBarHeight();

有一个非常简单的答案，没有通过上下文

public static int getScreenWidth() {
    return Resources.getSystem().getDisplayMetrics().widthPixels;
}

public static int getScreenHeight() {
    return Resources.getSystem().getDisplayMetrics().heightPixels;
}

注:如果你想要高度包括导航条，使用下面的方法

WindowManager windowManager =
        (WindowManager) BaseApplication.getApplication().getSystemService(Context.WINDOW_SERVICE);
    final Display display = windowManager.getDefaultDisplay();
    Point outPoint = new Point();
    if (Build.VERSION.SDK_INT >= 19) {
        // include navigation bar
        display.getRealSize(outPoint);
    } else {
        // exclude navigation bar
        display.getSize(outPoint);
    }
    if (outPoint.y > outPoint.x) {
        mRealSizeHeight = outPoint.y;
        mRealSizeWidth = outPoint.x;
    } else {
        mRealSizeHeight = outPoint.x;
        mRealSizeWidth = outPoint.y;
    }

由于getMetrics和getRealMetrics已弃用，谷歌建议按如下方式确定屏幕宽度和高度:

WindowMetrics windowMetrics = getActivity().getWindowManager().getMaximumWindowMetrics();
Rect bounds = windowMetrics.getBounds();
int widthPixels = bounds.width();
int heightPixels = bounds.height();

然而，我想出了另一种方法，给我同样的结果:

Configuration configuration = mContext.getResources().getConfiguration();
Display.Mode mode = display.getMode();
int widthPixels = mode.getPhysicalWidth();
int heightPixels = mode.getPhysicalHeight();

一些适用于检索屏幕大小的方法在API Level 31中已弃用，包括Display.getRealMetrics()和Display.getRealSize()。从API级别30开始，我们可以使用WindowManager#getCurrentWindowMetrics()。获取屏幕大小的简单方法是创建一些Compat类，例如:

object ScreenMetricsCompat {
    private val api: Api =
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) ApiLevel30()
        else Api()

    /**
     * Returns screen size in pixels.
     */
    fun getScreenSize(context: Context): Size = api.getScreenSize(context)

    @Suppress("DEPRECATION")
    private open class Api {
        open fun getScreenSize(context: Context): Size {
            val display = context.getSystemService(WindowManager::class.java).defaultDisplay
            val metrics = if (display != null) {
                DisplayMetrics().also { display.getRealMetrics(it) }
            } else {
                Resources.getSystem().displayMetrics
            }
            return Size(metrics.widthPixels, metrics.heightPixels)
        }
    }

    @RequiresApi(Build.VERSION_CODES.R)
    private class ApiLevel30 : Api() {
        override fun getScreenSize(context: Context): Size {
            val metrics: WindowMetrics = context.getSystemService(WindowManager::class.java).currentWindowMetrics
            return Size(metrics.bounds.width(), metrics.bounds.height())
        }
    }
}

调用ScreenMetricsCompat.getScreenSize(这个)。在Activity中我们可以得到屏幕高度。

我使用下面的代码来获取屏幕尺寸

getWindow().getDecorView().getWidth()
getWindow().getDecorView().getHeight()