问题描述
我创建了一些自定义元素，我想以编程方式将它们放置在右上角(顶部边缘 n 像素和右边缘 m 像素).因此我需要获取屏幕宽度和屏幕高度，然后设置位置:
I created some custom elements, and I want to programmatically place them to the upper right corner (n pixels from the top edge and m pixels from the right edge). Therefore I need to get the screen width and screen height and then set position:
int px = screenWidth - m;
int py = screenHeight - n;
如何在主Activity中获取screenWidth和screenHeight?
How do I get screenWidth and screenHeight in the main Activity?
推荐答案
如果你想要以像素为单位的显示尺寸，你可以使用 getSize:
If you want the display dimensions in pixels you can use getSize:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
如果您不在 Activity 中，则可以通过 WINDOW_SERVICE 获得默认的 Display:
If you're not in an Activity you can get the default Display via WINDOW_SERVICE:
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
如果您在片段中并且想要完成此操作，只需使用 Activity.WindowManager(在 Xamarin.Android 中)或 getActivity().getWindowManager()(在 java 中).
If you are in a fragment and want to acomplish this just use Activity.WindowManager (in Xamarin.Android) or getActivity().getWindowManager() (in java).
在引入 getSize 之前(在 API 级别 13 中)，您可以使用现已弃用的 getWidth 和 getHeight 方法:
Before getSize was introduced (in API level 13), you could use the getWidth and getHeight methods that are now deprecated:
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth(); // deprecated
int height = display.getHeight(); // deprecated
但是，对于您所描述的用例，布局中的边距/填充似乎更合适.
For the use case, you're describing, however, a margin/padding in the layout seems more appropriate.
另一种方式是:DisplayMetrics
描述有关显示的一般信息的结构，例如其大小、密度和字体缩放.要访问 DisplayMetrics 成员，请像这样初始化一个对象:
A structure describing general information about a display, such as its size, density, and font scaling. To access the DisplayMetrics members, initialize an object like this:
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
我们可以使用 widthPixels 来获取以下信息:
We can use widthPixels to get information for:
显示的绝对宽度，以像素为单位."
"The absolute width of the display in pixels."
示例:
Log.d("ApplicationTagName", "Display width in px is " + metrics.widthPixels);
API 30 级更新
final WindowMetrics metrics = windowManager.getCurrentWindowMetrics();
// Gets all excluding insets
final WindowInsets windowInsets = metrics.getWindowInsets();
Insets insets = windowInsets.getInsetsIgnoreVisibility(WindowInsets.Type.navigationBars()
| WindowInsets.Type.displayCutout());
int insetsWidth = insets.right + insets.left;
int insetsHeight = insets.top + insets.bottom;
// Legacy size that Display#getSize reports
final Rect bounds = metrics.getBounds();
final Size legacySize = new Size(bounds.width() - insetsWidth,
bounds.height() - insetsHeight);
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