java 获取页面适配器内的屏幕尺寸？
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Get screen dimensions inside page adapter?
提问by lisovaccaro
I'm trying to get screen dimensions inside page adapter. I could get it inside MainActivityand pass it to the adapter but it would be better to get it there. How can I do it, either directly inside the adapter or inside instantiateItem?
我正在尝试获取页面适配器内的屏幕尺寸。我可以把它放进去MainActivity并将它传递给适配器，但最好把它放在那里。我该怎么做，直接在适配器内部还是在内部instantiateItem？
This is my code:
这是我的代码：
public class MyPagerAdapter extends PagerAdapter {
Display display = getWindowManager().getDefaultDisplay(); // The method getWindowManager() is undefined for the type MyPagerAdapter
display.getSize(size);
...
}
回答by Olaf Dietsche
You're almost there. You already have a context. With that you can retrieve a WindowManagervia getSystemService(WINDOW_SERVICE)
你快到了。你已经有一个context. 有了它，你可以检索一个WindowManager通过getSystemService(WINDOW_SERVICE)
WindowManager wm = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
回答by syklon
From any context reference (such as in your intantiateItem), you can get a reference to the DisplayMetricsclass by doing
从任何上下文引用（例如在您的intantiateItem）中，您可以DisplayMetrics通过执行
context.getResources().getDisplayMetrics()
context.getResources().getDisplayMetrics()
Which gives you a reference to the DisplayMetricsclass DisplayMetrics
它为您提供了对DisplayMetrics类DisplayMetrics的引用
Particularly of use to you will be the widthPixelsand heightPixelsattributes of this, which return the raw pixel height and width for the device.
对您特别有用的是它的widthPixels和heightPixels属性，它返回设备的原始像素高度和宽度。
回答by Aida Drogan
public class MyPagerAdapter extends PagerAdapter {
DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
int pxWidth = displayMetrics.widthPixels;
float dpWidth = pxWidth / displayMetrics.density;
int pxHeight = displayMetrics.heightPixels;
float dpHeight = pxHeight / displayMetrics.density;
}
回答by Null Pointer Exception
you can Do this with WindowManager
你可以用 WindowManager 做到这一点
WindowManager wm = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
