我有一个启动屏幕活动，LinearLayout作为根视图，其宽度和高度为match_parent。这是该活动的onCreate（）方法中的代码。我在应用程序的所有其他活动中使用这些度量。

int displayWidth = getRawDisplayWidthPreHoneycomb();
int rawDisplayHeight = getRawDisplayHeightPreHoneycomb();
int usableDisplayHeight = rawDisplayHeight - getStatusBarHeight();
pf.setScreenParameters(displayWidth, usableDisplayHeight);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
    LinearLayout myView = (LinearLayout) findViewById(R.id.splash_view);
    myView.addOnLayoutChangeListener(new OnLayoutChangeListener() {
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
            if (left == 0 && top == 0 && right == 0 && bottom == 0) {
                return;
            }
            int displayWidth = Math.min(right, bottom);
            int usableDisplayHeight = Math.max(right, bottom);
            pf.setScreenParameters(displayWidth, usableDisplayHeight);
        }
    });
}

下面是上面调用的方法的实现：

private int getRawDisplayWidthPreHoneycomb() {
    WindowManager windowManager = getWindowManager();
    Display display = windowManager.getDefaultDisplay();
    DisplayMetrics displayMetrics = new DisplayMetrics();
    display.getMetrics(displayMetrics);

    int widthPixels = displayMetrics.widthPixels;
    int heightPixels = displayMetrics.heightPixels;

    return Math.min(widthPixels, heightPixels);
}

private int getRawDisplayHeightPreHoneycomb() {
    WindowManager w = getWindowManager();
    Display d = w.getDefaultDisplay();
    DisplayMetrics metrics = new DisplayMetrics();
    d.getMetrics(metrics);

    int widthPixels = metrics.widthPixels;
    int heightPixels = metrics.heightPixels;

    return Math.max(widthPixels, heightPixels);
}

public int getStatusBarHeight() {
    int statusBarHeight = 0;

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

    return statusBarHeight;
}

这将导致所有API版本和不同类型的设备（手机和平板电脑）的可用显示的高度和宽度，不包括任何类型的栏（状态栏、导航栏）。

对于正在搜索没有状态栏和操作栏的可用屏幕尺寸的用户（也感谢Swapnil的回答）：

DisplayMetrics dm = getResources().getDisplayMetrics();
float screen_w = dm.widthPixels;
float screen_h = dm.heightPixels;

int resId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resId > 0) {
    screen_h -= getResources().getDimensionPixelSize(resId);
}

TypedValue typedValue = new TypedValue();
if(getTheme().resolveAttribute(android.R.attr.actionBarSize, typedValue, true)){
    screen_h -= getResources().getDimensionPixelSize(typedValue.resourceId);
}

创建一个类和方法，如下所示：

public MyPoint getScreenDimensionsAsPixel(Context context){
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();

        Point point = new Point();
        display.getSize(point);

        return new MyPoint(point.x, point.y);
    }

    public class MyPoint{
        private int width;
        private int height;

        public MyPoint(int width, int height) {
            this.width = width;
            this.height = height;
        }

        public int getWidth() {
            return width;
        }

        public void setWidth(int width) {
            this.width = width;
        }

        public int getHeight() {
            return height;
        }

        public void setHeight(int height) {
            this.height = height;
        }
    }

然后在代码中使用它们：

MyPoint myPoint = getScreenDimensionsAsPixel(MainActivity.this);
                Toast.makeText(MainActivity.this, "width: " + String.valueOf(myPoint.getWidth()) + "|" +
                        "height: " + String.valueOf(myPoint.getHeight()), Toast.LENGTH_LONG).show();

以下是低于/高于API 30代码的Kotlin扩展函数：

fun Activity.getScreenWidth(): Int {
    return if (Build.VERSION.SDK_INT < 30) {
        val displayMetrics = DisplayMetrics()
        windowManager.defaultDisplay.getMetrics(displayMetrics)
        displayMetrics.widthPixels
    } else {
        val metrics = windowManager.currentWindowMetrics
        val insets = metrics.windowInsets
            .getInsetsIgnoringVisibility(WindowInsets.Type.systemBars())
        metrics.bounds.width() - insets.left - insets.right
    }
}

fun Activity.getScreenHeight(): Int {
    return if (Build.VERSION.SDK_INT < 30) {
        val displayMetrics = DisplayMetrics()
        windowManager.defaultDisplay.getMetrics(displayMetrics)
        displayMetrics.heightPixels
    } else {
        val metrics = windowManager.currentWindowMetrics
        val insets = metrics.windowInsets
            .getInsetsIgnoringVisibility(WindowInsets.Type.systemBars())
        metrics.bounds.height() - insets.top - insets.bottom
    }
}

对应的Java助手方法：

public int getScreenWidth(Activity activity) {
    if (Build.VERSION.SDK_INT < 30) {
        DisplayMetrics displayMetrics = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
        return displayMetrics.widthPixels;
    } else {
        WindowMetrics metrics = activity.getWindowManager().getCurrentWindowMetrics();
        Insets insets = metrics.getWindowInsets()
                .getInsetsIgnoringVisibility(WindowInsets.Type.systemBars());
        return metrics.getBounds().width() - insets.left - insets.right;
    }
}


public int getScreenHeight(Activity activity) {
    if (Build.VERSION.SDK_INT < 30) {
        DisplayMetrics displayMetrics = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
        return displayMetrics.heightPixels;
    } else {
        WindowMetrics metrics = activity.getWindowManager().getCurrentWindowMetrics();
        Insets insets = metrics.getWindowInsets()
                .getInsetsIgnoringVisibility(WindowInsets.Type.systemBars());
        return metrics.getBounds().height() - insets.bottom - insets.top;
    }
}

它可能无法回答您的问题，但如果你需要一个视图的维度，但你的代码在尚未布局时（例如在onCreate（）中）正在执行，你可以使用View.getViewTreeObserver（）.addOnGlobalLayoutListener（）设置一个ViewTreeObserver.OnGlobalLayout侦听器，并将需要该视图的相关代码放入尺寸。布局布局完成后，将调用侦听器的回调。

创建Kotlin扩展函数以获取屏幕宽度和高度-

fun Context?.screenWidthInPx(): Int {
    if (this == null) return 0
    val dm = DisplayMetrics()
    val wm = this.getSystemService(Context.WINDOW_SERVICE) as WindowManager
    wm.defaultDisplay.getMetrics(dm)
    return dm.widthPixels
}
//comment
fun Context?.screenHeightInPx(): Int {
    if (this == null) return 0
    val dm = DisplayMetrics()
    val wm = this.getSystemService(Context.WINDOW_SERVICE) as WindowManager
    wm.defaultDisplay.getMetrics(dm)
    return dm.heightPixels
}