我该如何获取屏幕宽度和高度,并在代码中使用这个值:
@Override protected void onMeasure(int widthSpecId, int heightSpecId) {
Log.e(TAG, "onMeasure" + widthSpecId);
setMeasuredDimension(SCREEN_WIDTH, SCREEN_HEIGHT -
game.findViewById(R.id.flag).getHeight());
}
我该如何获取屏幕宽度和高度,并在代码中使用这个值:
@Override protected void onMeasure(int widthSpecId, int heightSpecId) {
Log.e(TAG, "onMeasure" + widthSpecId);
setMeasuredDimension(SCREEN_WIDTH, SCREEN_HEIGHT -
game.findViewById(R.id.flag).getHeight());
}
使用以下代码可以获取运行时显示器的宽度和高度:
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;
在视图中,您需要像这样做:((Activity) getContext()).getWindowManager()
.getDefaultDisplay()
.getMetrics(displayMetrics);
在某些情况下,在设备具有导航栏的情况下,您需要在运行时进行检查:public boolean showNavigationBar(Resources resources)
{
int id = resources.getIdentifier("config_showNavigationBar", "bool", "android");
return id > 0 && resources.getBoolean(id);
}
如果设备具有导航栏,则计算其高度:
private int getNavigationBarHeight() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int usableHeight = metrics.heightPixels;
getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
int realHeight = metrics.heightPixels;
if (realHeight > usableHeight)
return realHeight - usableHeight;
else
return 0;
}
return 0;
}
因此,设备的最终高度为:
int height = displayMetrics.heightPixels + getNavigationBarHeight();
getResources().getDisplayMetrics().heightPixels / getResources().getDisplayMetrics().widthPixels
无需额外操作,该代码可直接返回屏幕的纵横比。 - Alex有一个非常简单的答案,不需要上下文。
public static int getScreenWidth() {
return Resources.getSystem().getDisplayMetrics().widthPixels;
}
public static int getScreenHeight() {
return Resources.getSystem().getDisplayMetrics().heightPixels;
}
注意:如果您想要包括导航栏的高度,请使用下面的方法
WindowManager windowManager =
(WindowManager) BaseApplication.getApplication().getSystemService(Context.WINDOW_SERVICE);
final Display display = windowManager.getDefaultDisplay();
Point outPoint = new Point();
if (Build.VERSION.SDK_INT >= 19) {
// include navigation bar
display.getRealSize(outPoint);
} else {
// exclude navigation bar
display.getSize(outPoint);
}
if (outPoint.y > outPoint.x) {
mRealSizeHeight = outPoint.y;
mRealSizeWidth = outPoint.x;
} else {
mRealSizeHeight = outPoint.x;
mRealSizeWidth = outPoint.y;
}
仅仅是为了更新parag和SpK的答案,以便与当前SDK的向后兼容性保持一致,弃用了一些方法:
int Measuredwidth = 0;
int Measuredheight = 0;
Point size = new Point();
WindowManager w = getWindowManager();
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
w.getDefaultDisplay().getSize(size);
Measuredwidth = size.x;
Measuredheight = size.y;
}else{
Display d = w.getDefaultDisplay();
Measuredwidth = d.getWidth();
Measuredheight = d.getHeight();
}
getSize
实现时遇到了无法获取非0返回值的问题,但是这个答案中的弃用方法可以正确返回。因此,这对于旧版本的Android很有用。 - Damien Diehl为什么不呢
DisplayMetrics displaymetrics = getResources().getDisplayMetrics();
然后使用
displayMetrics.widthPixels
和
displayMetrics.heightPixels
Fragment
的onViewCreated()
中的widthPixels
或heightPixels
返回0。如果您想计算GridLayoutManager
的跨度计数,这真的很烦人。 - Bram Stoker在安卓系统中,这非常容易:
int width = Resources.getSystem().getDisplayMetrics().widthPixels;
int height = Resources.getSystem().getDisplayMetrics().heightPixels;
您可以从 context 中获取宽度和高度。
Java:
int width= context.getResources().getDisplayMetrics().widthPixels;
int height= context.getResources().getDisplayMetrics().heightPixels;
Kotlin
val width: Int = context.resources.displayMetrics.widthPixels
val height: Int = context.resources.displayMetrics.heightPixels
Kotlin 版本
如果您想要获取屏幕的像素大小以及 dp
,使用这些扩展属性可以很方便地实现:
import android.content.Context
import android.content.res.Resources
import android.graphics.Rect
import android.graphics.RectF
import android.os.Build
import android.util.DisplayMetrics
import android.view.WindowManager
import kotlin.math.roundToInt
/**
* @author aminography
*/
private val displayMetrics: DisplayMetrics by lazy { Resources.getSystem().displayMetrics }
/**
* Returns boundary of the screen in pixels (px).
*/
val screenRectPx: Rect
get() = displayMetrics.run { Rect(0, 0, widthPixels, heightPixels) }
/**
* Returns boundary of the screen in density independent pixels (dp).
*/
val screenRectDp: RectF
get() = screenRectPx.run { RectF(0f, 0f, right.px2dp, bottom.px2dp) }
/**
* Returns boundary of the physical screen including system decor elements (if any) like navigation
* bar in pixels (px).
*/
val Context.physicalScreenRectPx: Rect
get() = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
(applicationContext.getSystemService(Context.WINDOW_SERVICE) as WindowManager)
.run { DisplayMetrics().also { defaultDisplay.getRealMetrics(it) } }
.run { Rect(0, 0, widthPixels, heightPixels) }
} else screenRectPx
/**
* Returns boundary of the physical screen including system decor elements (if any) like navigation
* bar in density independent pixels (dp).
*/
val Context.physicalScreenRectDp: RectF
get() = physicalScreenRectPx.run { RectF(0f, 0f, right.px2dp, bottom.px2dp) }
/**
* Converts any given number from pixels (px) into density independent pixels (dp).
*/
val Number.px2dp: Float
get() = this.toFloat() / displayMetrics.density
/**
* Converts any given number from density independent pixels (dp) into pixels (px).
*/
val Number.dp2px: Int
get() = (this.toFloat() * displayMetrics.density).roundToInt()
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")
println()
val physicalWidthPx = physicalScreenRectPx.width()
val physicalHeightPx = physicalScreenRectPx.height()
println("[PX] physical screen width: $physicalWidthPx , height: $physicalHeightPx")
val physicalWidthDp = physicalScreenRectDp.width()
val physicalHeightDp = physicalScreenRectDp.height()
println("[DP] physical screen width: $physicalWidthDp , height: $physicalHeightDp")
}
}
当设备处于竖屏
方向时:
[PX] screen width: 1440 , height: 2392
[DP] screen width: 360.0 , height: 598.0
[PX] physical screen width: 1440 , height: 2560
[DP] physical screen width: 360.0 , height: 640.0
设备处于横屏
模式时:[PX] screen width: 2392 , height: 1440
[DP] screen width: 598.0 , height: 360.0
[PX] physical screen width: 2560 , height: 1440
[DP] physical screen width: 640.0 , height: 360.0
Context.physicalScreenRectPx
和Context.physicalScreenRectDp
来获取屏幕的真实尺寸。 - aminography在API Level 31中,包括Display.getRealMetrics()
和Display.getRealSize()
在内的一些用于检索屏幕大小的方法已不推荐使用。从API Level 30开始,我们可以使用WindowManager#getCurrentWindowMetrics()
。获取屏幕大小的正确方法是创建一些兼容类,例如:
object ScreenMetricsCompat {
private val api: Api =
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) ApiLevel30()
else Api()
/**
* Returns screen size in pixels.
*/
fun getScreenSize(context: Context): Size = api.getScreenSize(context)
@Suppress("DEPRECATION")
private open class Api {
open fun getScreenSize(context: Context): Size {
val display = context.getSystemService(WindowManager::class.java).defaultDisplay
val metrics = if (display != null) {
DisplayMetrics().also { display.getRealMetrics(it) }
} else {
Resources.getSystem().displayMetrics
}
return Size(metrics.widthPixels, metrics.heightPixels)
}
}
@RequiresApi(Build.VERSION_CODES.R)
private class ApiLevel30 : Api() {
override fun getScreenSize(context: Context): Size {
val metrics: WindowMetrics = context.getSystemService(WindowManager::class.java).currentWindowMetrics
return Size(metrics.bounds.width(), metrics.bounds.height())
}
}
}
通过在Activity
中调用ScreenMetricsCompat.getScreenSize(this).height
,我们可以获取屏幕高度。
ContextCompat.getSystemService(context, WindowManager::class.java)?.defaultDisplay
而不是 context.getSystemService(WindowManager::class.java).defaultDisplay
来安全地针对低于 23 的 API。 - Islam Khaled请尝试以下代码:
1.
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
2.
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth(); // deprecated
int height = display.getHeight(); // deprecated
或者int width = getWindowManager().getDefaultDisplay().getWidth();
int height = getWindowManager().getDefaultDisplay().getHeight();
3.
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
metrics.heightPixels;
metrics.widthPixels;
我建议你创建扩展函数。
/**
* Return the width and height of the screen
*/
val Context.screenWidth: Int
get() = resources.displayMetrics.widthPixels
val Context.screenHeight: Int
get() = resources.displayMetrics.heightPixels
/**
* Pixel and Dp Conversion
*/
val Float.toPx get() = this * Resources.getSystem().displayMetrics.density
val Float.toDp get() = this / Resources.getSystem().displayMetrics.density
val Int.toPx get() = (this * Resources.getSystem().displayMetrics.density).toInt()
val Int.toDp get() = (this / Resources.getSystem().displayMetrics.density).toInt()