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
我使用了上述建议,并为我们的问题创建了一个kotlin版本。希望这为使用科特林的人提供一些额外的帮助:
private val screenDimensions: Int by lazy {
val display = (context.getSystemService(Context.WINDOW_SERVICE) as WindowManager).defaultDisplay
Point()
.also { size ->
when {
Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1 -> display.getRealSize(size)
else -> display.getSize(size)
}
}
}
screenDimensions.x // width
screenDimensions.y // height
其他回答
我认为这是最简单的
private fun checkDisplayResolution() {
val displayMetrics = DisplayMetrics().also {
windowManager.defaultDisplay.getMetrics(it)
}
Log.i(TAG, "display width: ${displayMetrics.widthPixels}")
Log.i(TAG, "display height: ${displayMetrics.heightPixels}")
Log.i(TAG, "display width dpi: ${displayMetrics.xdpi}")
Log.i(TAG, "display height dpi: ${displayMetrics.ydpi}")
Log.i(TAG, "display density: ${displayMetrics.density}")
Log.i(TAG, "display scaled density: ${displayMetrics.scaledDensity}")
}
要获得屏幕尺寸,请使用显示度量
DisplayMetrics displayMetrics = new DisplayMetrics();
if (context != null)
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display defaultDisplay = windowManager.getDefaultDisplay();
defaultDisplay.getRealMetrics(displayMetrics);
}
以像素为单位获取高度和宽度
int width =displayMetrics.widthPixels;
int height =displayMetrics.heightPixels;
这是我用于任务的代码:
// `activity` is an instance of Activity class.
Display display = activity.getWindowManager().getDefaultDisplay();
Point screen = new Point();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
display.getSize(screen);
} else {
screen.x = display.getWidth();
screen.y = display.getHeight();
}
看起来很干净,但要注意贬低。
一种方法是:
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
它已被弃用,您应该尝试以下代码。前两行代码提供DisplayMetrics对象。此对象包含高度像素、宽度像素等字段。
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
Api级别30更新
final WindowMetrics metrics = windowManager.getCurrentWindowMetrics();
// Gets all excluding insets
final WindowInsets windowInsets = metrics.getWindowInsets();
Insets insets = windowInsets.getInsetsIgnoringVisibility(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);
如果您想要以像素为单位的显示尺寸,可以使用getSize:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
如果您不在“活动”中,则可以通过WINDOW_SERVICE获取默认显示:
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
如果您在一个片段中,并且想要实现这一点,只需使用Activity.WindowManager(在Xamarin.Android中)或getActivity().getWindowManager()(在java中)。
在引入getSize之前(在API级别13中),您可以使用现在已弃用的getWidth和getHeight方法:
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth(); // deprecated
int height = display.getHeight(); // deprecated
然而,对于用例,您正在描述布局中的边距/填充似乎更合适。
另一种方法是:DisplayMetrics
一种结构,描述有关显示器的一般信息,如大小、密度和字体比例。要访问DisplayMetrics成员,请初始化如下对象:
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
我们可以使用widthPixels获取以下信息:
“显示的绝对宽度(以像素为单位)。”
例子:
Log.d("ApplicationTagName", "Display width in px is " + metrics.widthPixels);
API等级30更新
final WindowMetrics metrics = windowManager.getCurrentWindowMetrics();
// Gets all excluding insets
final WindowInsets windowInsets = metrics.getWindowInsets();
Insets insets = windowInsets.getInsetsIgnoringVisibility(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);