android - 如何在Android中以像素为单位获取屏幕尺寸(How to get screen dimensions as pixels in Android)

Question

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).

(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，右侧边缘m像素）。)

Therefore I need to get the screen width and screen height and then set position:

(因此，我需要获取屏幕宽度和屏幕高度，然后设置位置：)

int px = screenWidth - m;
int py = screenHeight - n;

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

(如何在主活动中获取screenWidth和screenHeight ？)

  ask by Niko Gamulin translate from so

Answer 1

If you want the display dimensions in pixels you can use getSize :

(如果要以像素为单位显示尺寸，可以使用getSize ：)

Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;

If you're not in an Activity you can get the default Display via WINDOW_SERVICE :

(如果您不在Activity ，则可以通过WINDOW_SERVICE获取默认的Display ：)

WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();

If you are in a fragment and want to acomplish this just use Activity.WindowManager (in Xamarin.Android) or getActivity().getWindowManager() (in java).

(如果您在一个片段中并且想要完成此操作，请使用Activity.WindowManager（在Xamarin.Android中）或getActivity（）。getWindowManager（）（在Java中）。)

Before getSize was introduced (in API level 13), you could use the getWidth and getHeight methods that are now deprecated:

(在引入getSize之前（在API级别13中），可以使用现已弃用的getWidth和getHeight方法：)

Display display = getWindowManager().getDefaultDisplay(); 
int width = display.getWidth();  // deprecated
int height = display.getHeight();  // deprecated

For the use case you're describing however, a margin/padding in the layout seems more appropriate.

(但是，对于您正在描述的用例，布局中的边距/填充似乎更合适。)

Another way is: DisplayMetrics

(另一种方法是： DisplayMetrics)

A structure describing general information about a display, such as its size, density, and font scaling.

(描述有关显示器的一般信息的结构，例如其大小，密度和字体缩放。)

To access the DisplayMetrics members, initialize an object like this:

(要访问DisplayMetrics成员，请像这样初始化一个对象：)

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);

We can use widthPixels to get information for:

(我们可以使用widthPixels获取以下信息：)

"The absolute width of the display in pixels."

(“显示的绝对宽度，以像素为单位。”)

Example:

(例：)

Log.d("ApplicationTagName", "Display width in px is " + metrics.widthPixels);