我创建了一些自定义元素,并希望以编程方式将它们放置在右上角(距离上边缘n个像素,距离右边缘m个像素)。因此,我需要获得屏幕宽度和屏幕高度,然后设置位置:
int px = screenWidth - m;
int py = screenHeight - n;
如何在主活动中获取screenWidth和screenHeight?
我创建了一些自定义元素,并希望以编程方式将它们放置在右上角(距离上边缘n个像素,距离右边缘m个像素)。因此,我需要获得屏幕宽度和屏幕高度,然后设置位置:
int px = screenWidth - m;
int py = screenHeight - n;
如何在主活动中获取screenWidth和screenHeight?
当前回答
DisplayMetrics dimension = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dimension);
int w = dimension.widthPixels;
int h = dimension.heightPixels;
其他回答
这不是更好的解决方案吗?DisplayMetrics提供了您所需的一切,并从API 1开始工作。
public void getScreenInfo(){
DisplayMetrics metrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);
heightPixels = metrics.heightPixels;
widthPixels = metrics.widthPixels;
density = metrics.density;
densityDpi = metrics.densityDpi;
}
您也可以使用getRealMetrics获得实际显示(包括屏幕装饰,如状态栏或软件导航栏),但这仅适用于17+。
我错过了什么吗?
简单的功能与较低版本兼容。
/**
* @return screen size int[width, height]
*
* */
public int[] getScreenSize(){
Point size = new Point();
WindowManager w = getWindowManager();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2){
w.getDefaultDisplay().getSize(size);
return new int[]{size.x, size.y};
}else{
Display d = w.getDefaultDisplay();
//noinspection deprecation
return new int[]{d.getWidth(), d.getHeight()};
}
}
要使用:
int width = getScreenSize()[0];
int height = getScreenSize()[1];
如果Display类不工作,则上面的答案将不起作用,那么您可以通过下面的方法获得宽度和高度。
private static final int WIDTH_INDEX = 0;
private static final int HEIGHT_INDEX = 1;
public static int[] getScreenSize(Context context) {
int[] widthHeight = new int[2];
widthHeight[WIDTH_INDEX] = 0;
widthHeight[HEIGHT_INDEX] = 0;
try {
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
widthHeight[WIDTH_INDEX] = size.x;
widthHeight[HEIGHT_INDEX] = size.y;
if (!isScreenSizeRetrieved(widthHeight))
{
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
widthHeight[0] = metrics.widthPixels;
widthHeight[1] = metrics.heightPixels;
}
// Last defense. Use deprecated API that was introduced in lower than API 13
if (!isScreenSizeRetrieved(widthHeight)) {
widthHeight[0] = display.getWidth(); // deprecated
widthHeight[1] = display.getHeight(); // deprecated
}
} catch (Exception e) {
e.printStackTrace();
}
return widthHeight;
}
private static boolean isScreenSizeRetrieved(int[] widthHeight) {
return widthHeight[WIDTH_INDEX] != 0 && widthHeight[HEIGHT_INDEX] != 0;
}
科特林
fun getScreenHeight(activity: Activity): Int {
val metrics = DisplayMetrics()
activity.windowManager.defaultDisplay.getMetrics(metrics)
return metrics.heightPixels
}
fun getScreenWidth(activity: Activity): Int {
val metrics = DisplayMetrics()
activity.windowManager.defaultDisplay.getMetrics(metrics)
return metrics.widthPixels
}
我发现这起了作用。
Rect dim = new Rect();
getWindowVisibleDisplayFrame(dim);