如何在Android中以像素为单位获取屏幕尺寸 [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(顶部边缘为n像素，右侧边缘为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;

如何在主要活动中获取screenWidth和screenHeight?

How do I get screenWidth and screenHeight in the main Activity?

推荐答案

如果要以像素为单位显示尺寸，可以使用

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获取默认的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();

如果您要处理一个片段，只需使用Activity.WindowManager(在Xamarin.Android中)或getActivity().getWindowManager()(在Java中)即可.

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)，可以使用现在不推荐使用的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

但是对于您要描述的用例，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.

另一种方法是: DisplayMetrics

一种结构，描述有关显示器的常规信息，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获取以下信息:

We can use widthPixels to get information for:

显示器的绝对宽度(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);

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