第一种

JAVA代码

int screenWidth = getWindowManager().getDefaultDisplay().getWidth();
int screenHeight = getWindowManager().getDefaultDisplay().getHeight();

Kotlin代码

val screenWidth = windowManager.defaultDisplay.width
val screenHeight = windowManager.defaultDisplay.height

已经补标记过时，不推荐使用。

第二种

Java代码

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int screenWidth = dm.widthPixels;
int screenHeight = dm.heightPixels;

Kotlin代码

val dm = DisplayMetrics()
windowManager.defaultDisplay.getMetrics(dm)
val screenWidth = dm.widthPixels
val screenHeight = dm.heightPixels

第三种

Java代码

Resources resources = this.getResources();
DisplayMetrics dm = resources.getDisplayMetrics();
int screenWidth = dm.widthPixels;
int screenHeight = dm.heightPixels;

Kotlin代码

val resources: Resources = this.resources
val dm: DisplayMetrics = resources.displayMetrics
val screenWidth = dm.widthPixels
val screenHeight = dm.heightPixels

第四种

前面三种获取的值单位是px，这一种得到的是dp值。

Java代码

Configuration config = getResources().getConfiguration();
int screenWidth = config.screenWidthDp;
int screenHeight = config.screenHeightDp;

Kotlin代码

val config: Configuration = resources.configuration
val screenWidth = config.screenWidthDp
val screenHeight = config.screenHeightDp

Compose中获取

val config = LocalConfiguration.current
val screenWidth = config.screenWidthDp
val screenHeight = config.screenHeightDp