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

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

public class DisplayInfo {
    int screen_height=0, screen_width=0;
    WindowManager wm;
    DisplayMetrics displaymetrics;

    DisplayInfo(Context context) {
        getdisplayheightWidth(context);
    }

    void getdisplayheightWidth(Context context) {
        wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        displaymetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(displaymetrics);
        screen_height = displaymetrics.heightPixels;
        screen_width = displaymetrics.widthPixels;
    }

    public int getScreen_height() {
        return screen_height;
    }

    public int getScreen_width() {
        return screen_width;
    }
}

试试Kotlin的这段代码

 val display = windowManager.defaultDisplay
 val size = Point()
 display.getSize(size)
 var DEVICE_WIDTH = size.x
 var DEVICE_HEIGHT = size.y

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。

我更新了Kotlin语言的答案!

对于Kotlin:您应该调用窗口管理器并获取指标。在那简单的方法之后。

val displayMetrics = DisplayMetrics()
windowManager.defaultDisplay.getMetrics(displayMetrics)

var width = displayMetrics.widthPixels
var height = displayMetrics.heightPixels

如何用Kotlin语言有效地独立活动地使用它?

这里，我在一般的Kotlin类中创建了一个方法。你可以在所有活动中使用它。

private val T_GET_SCREEN_WIDTH:String = "screen_width"
private val T_GET_SCREEN_HEIGHT:String = "screen_height"

private fun getDeviceSizes(activity:Activity, whichSize:String):Int{

    val displayMetrics = DisplayMetrics()
    activity.windowManager.defaultDisplay.getMetrics(displayMetrics)

    return when (whichSize){
        T_GET_SCREEN_WIDTH -> displayMetrics.widthPixels
        T_GET_SCREEN_HEIGHT -> displayMetrics.heightPixels
        else -> 0 // Error
    }
}