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
•Kotlin版本通过扩展属性
在android中有多种实现屏幕尺寸的方法,但我认为最好的解决方案可以独立于Context实例,因此您可以在代码中的任何地方使用它。在这里,我通过kotlin扩展属性提供了一个解决方案,它可以很容易地知道以像素为单位的屏幕大小以及dp:
尺寸Utils.kt
import android.content.res.Resources
import android.graphics.Rect
import android.graphics.RectF
import android.util.DisplayMetrics
import kotlin.math.roundToInt
/**
* @author aminography
*/
private val displayMetrics: DisplayMetrics by lazy { Resources.getSystem().displayMetrics }
val screenRectPx: Rect
get() = displayMetrics.run { Rect(0, 0, widthPixels, heightPixels) }
val screenRectDp: RectF
get() = displayMetrics.run { RectF(0f, 0f, widthPixels.px2dp, heightPixels.px2dp) }
val Number.px2dp: Float
get() = this.toFloat() / displayMetrics.density
val Number.dp2px: Int
get() = (this.toFloat() * displayMetrics.density).roundToInt()
用法:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val widthPx = screenRectPx.width()
val heightPx = screenRectPx.height()
println("[PX] screen width: $widthPx , height: $heightPx")
val widthDp = screenRectDp.width()
val heightDp = screenRectDp.height()
println("[DP] screen width: $widthDp , height: $heightDp")
}
}
结果:
当设备处于纵向时:
[PX] screen width: 1440 , height: 2392
[DP] screen width: 360.0 , height: 598.0
当设备处于横向时:
[PX] screen width: 2392 , height: 1440
[DP] screen width: 598.0 , height: 360.0
如果您不是kotlin的粉丝,请使用java版本:
import android.content.res.Resources;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.DisplayMetrics;
/**
* @author aminography
*/
public class DimensionUtils {
private static DisplayMetrics displayMetrics;
private static DisplayMetrics getDisplayMetrics() {
if (displayMetrics == null) {
displayMetrics = Resources.getSystem().getDisplayMetrics();
}
return displayMetrics;
}
public static Rect screenRectPx() {
return new Rect(0, 0, getDisplayMetrics().widthPixels, getDisplayMetrics().heightPixels);
}
public static RectF screenRectDp() {
return new RectF(0f, 0f, px2dp(getDisplayMetrics().widthPixels), px2dp(getDisplayMetrics().heightPixels));
}
public static float px2dp(int value) {
return value / getDisplayMetrics().density;
}
public static int dp2px(float value) {
return (int) (value * getDisplayMetrics().density);
}
}
其他回答
我会这样包装getSize代码:
@SuppressLint("NewApi")
public static Point getScreenSize(Activity a) {
Point size = new Point();
Display d = a.getWindowManager().getDefaultDisplay();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
d.getSize(size);
} else {
size.x = d.getWidth();
size.y = d.getHeight();
}
return size;
}
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。
科特林牌手表
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
}
JAVA
DisplayMetrics dimension = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dimension);
int w = dimension.widthPixels;
int h = dimension.heightPixels;
此函数以英寸为单位返回近似屏幕大小。
public double getScreenSize()
{
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width=dm.widthPixels;
int height=dm.heightPixels;
int dens=dm.densityDpi;
double wi=(double)width/(double)dens;
double hi=(double)height/(double)dens;
double x = Math.pow(wi,2);
double y = Math.pow(hi,2);
double screenInches = Math.sqrt(x+y);
return screenInches;
}
以上代码已在API级别30中弃用。现在您可以使用以下代码
val width = windowManager.currentWindowMetrics.bounds.width()
val height = windowManager.currentWindowMetrics.bounds.height()
此方法报告包括所有系统栏区域的窗口大小,而Display#getSize(Point)报告不包括导航栏和显示剪切区域的区域。Display#getSize(Point)报告的值可通过以下方式获得:
val metrics = windowManager.currentWindowMetrics
// Gets all excluding insets
val windowInsets = metrics.windowInsets
var insets: Insets = windowInsets.getInsets(WindowInsets.Type.navigationBars())
val cutout = windowInsets.displayCutout
if (cutout != null) {
val cutoutSafeInsets = Insets.of(cutout.safeInsetLeft, cutout.safeInsetTop, cutout.safeInsetRight, cutout.safeInsetBottom)
insets = Insets.max(insets, cutoutSafeInsets)
}
val insetsWidth = insets.right + insets.left
val insetsHeight = insets.top + insets.bottom
// Legacy size that Display#getSize reports
val legacySize = Size(metrics.bounds.width() - insetsWidth, metrics.bounds.height() - insetsHeight)
来源:WindowManager#getCurrentWindowMetrics()