如何在Android中将屏幕尺寸作为像素获取 [英] How to get screen dimensions as pixels in Android

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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